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) (Currency Forward Contracts [Member], USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Mar. 31, 2013
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets $ 2,391 $ 1,936 $ 4,553
Prepaid Expenses And Other Current Assets [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 312 2,956 512
Other Non-Current Assets [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 128 24 0
Accrued Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 1,017 872 119
Accrued Liabilities [Member] | Derivative Instruments Not Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 0 280 684
Other Long Term Liabilities [Member] | Derivative Instruments Designated As Cash Flow Hedges [Member]
     
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities $ 33 $ 95 $ 0