Quarterly report pursuant to Section 13 or 15(d)

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

v3.2.0.727
Financial Instruments And Risk Management (Balance Sheet Classification And Fair Value Of Derivative Instruments) (Details) - USD ($)
$ in Thousands
 6 Months Ended
Jun. 30, 2015
Dec. 31, 2014
Jun. 30, 2014
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 $ 4,485 $ 9,993 $ 986
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 4,458 2,754 302
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 320 0 155
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 28 0 1,081
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 738 924 650
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 $ 0 $ 0 $ 12
Maximum [Member]      
Derivatives, Fair Value [Line Items]      
Derivatives maximum remaining maturity 2 years