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Financial Instruments and Risk Management Financial Instruments and Risk Management (Balance Sheet Classification and Fair Value of Derivative Instruments) (Details) (Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified |
Dec. 31, 2013
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Dec. 31, 2012
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Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative assets | $ 2,956 | $ 4,072 |
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Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative liabilities | 280 | 743 |
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Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative assets | 1,936 | 2,147 |
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Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative assets | 24 | 489 |
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Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative liabilities | 872 | 579 |
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Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]
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| Derivatives, Fair Value [Line Items] | ||
| Fair value of derivative liabilities | $ 95 | $ 0 |