Annual report pursuant to Section 13 and 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) - Forward Contracts [Member] - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 2,146 $ 1,797
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 953 970
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 11,855 11,818
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 4,159 9,922
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 1,313 47
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 768 $ 1