Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments And Risk Management (Balance Sheet Classification And Fair Value Of Derivative Instruments) (Details)

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Financial Instruments And Risk Management (Balance Sheet Classification And Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Mar. 31, 2015
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets $ 409 $ 5,394 $ 14,475
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] | Foreign Exchange Option [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 0 0 132
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 7 1,328 1,180
Other Non-Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 63 566 0
Accrued Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 3,524 224 0
Accrued Liabilities [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 727 1,693 123
Other Long Term Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member] | Currency Forward Contracts [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities $ 922 $ 0 $ 0