|
Fair Value Measures (Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) (USD $)
In Thousands, unless otherwise specified
|
Dec. 31, 2011
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Dec. 31, 2010
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
$ 79,294
|
$ 261,822
|
| Liabilities, fair value |
3,877
|
7,003
|
|
Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
70,941
|
201,908
|
| Liabilities, fair value |
|
|
|
Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
8,353
|
59,914
|
| Liabilities, fair value |
3,877
|
7,003
|
|
Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
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| Liabilities, fair value |
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|
|
Money Market Funds [Member] | Cash Equivalents [Member]
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|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
55,542
|
177,104
|
|
Money Market Funds [Member] | Cash Equivalents [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
55,542
|
177,104
|
|
Money Market Funds [Member] | Cash Equivalents [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Money Market Funds [Member] | Cash Equivalents [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Time Deposits [Member] | Cash Equivalents [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
10,000
|
7,510
|
|
Time Deposits [Member] | Cash Equivalents [Member] | Level 1 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
10,000
|
7,510
|
|
Time Deposits [Member] | Cash Equivalents [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Time Deposits [Member] | Cash Equivalents [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Time Deposits [Member] | Available-For-Sale Short-Term Investments [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
2,878
|
|
|
Time Deposits [Member] | Available-For-Sale Short-Term Investments [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
2,878
|
|
|
Time Deposits [Member] | Available-For-Sale Short-Term Investments [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Time Deposits [Member] | Available-For-Sale Short-Term Investments [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
7,236
|
1,166
|
|
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
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|
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
7,236
|
1,166
|
|
Other Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
|
|
Mutual Fund Shares [Member] | Non-Current Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Assets, fair value |
2,521
|
1,670
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|
Mutual Fund Shares [Member] | Non-Current Assets [Member] | Level 1 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
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| Assets, fair value |
2,521
|
1,670
|
|
Mutual Fund Shares [Member] | Non-Current Assets [Member] | Level 2 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
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|
Mutual Fund Shares [Member] | Non-Current Assets [Member] | Level 3 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
|
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U.S. Government-Backed Municipal Bonds [Member] | Cash Equivalents [Member]
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
5,560
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|
U.S. Government-Backed Municipal Bonds [Member] | Cash Equivalents [Member] | Level 1 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
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|
U.S. Government-Backed Municipal Bonds [Member] | Cash Equivalents [Member] | Level 2 [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
5,560
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|
U.S. Government-Backed Municipal Bonds [Member] | Cash Equivalents [Member] | Level 3 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
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U.S. Government-Backed Municipal Bonds [Member] | Available-For-Sale Short-Term Investments [Member]
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|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
53,188
|
|
U.S. Government-Backed Municipal Bonds [Member] | Available-For-Sale Short-Term Investments [Member] | Level 1 [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
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U.S. Government-Backed Municipal Bonds [Member] | Available-For-Sale Short-Term Investments [Member] | Level 2 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
53,188
|
|
U.S. Government-Backed Municipal Bonds [Member] | Available-For-Sale Short-Term Investments [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
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Non-Current Assets [Member] | Derivative Financial Instruments, Assets [Member]
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
1,117
|
|
|
Non-Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Non-Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
1,117
|
|
|
Non-Current Assets [Member] | Derivative Financial Instruments, Assets [Member] | Level 3 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
|
|
Short-Term Municipal Bond Fund [Member] | Available-For-Sale Short-Term Investments [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
15,624
|
|
Short-Term Municipal Bond Fund [Member] | Available-For-Sale Short-Term Investments [Member] | Level 1 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Assets, fair value |
|
15,624
|
|
Short-Term Municipal Bond Fund [Member] | Available-For-Sale Short-Term Investments [Member] | Level 2 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
|
|
Short-Term Municipal Bond Fund [Member] | Available-For-Sale Short-Term Investments [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Assets, fair value |
|
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|
Derivative Financial Instruments, Liabilities [Member] | Accrued Liabilities [Member]
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Liabilities, fair value |
3,786
|
7,003
|
|
Derivative Financial Instruments, Liabilities [Member] | Accrued Liabilities [Member] | Level 1 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Liabilities, fair value |
|
|
|
Derivative Financial Instruments, Liabilities [Member] | Accrued Liabilities [Member] | Level 2 [Member]
|
|
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| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
|
| Liabilities, fair value |
3,786
|
7,003
|
|
Derivative Financial Instruments, Liabilities [Member] | Accrued Liabilities [Member] | Level 3 [Member]
|
|
|
| Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |
|
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| Liabilities, fair value |
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