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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
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets $ 1,759 $ 1,650 $ 4,449
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 1,793 2,268 978
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 2,438 947 18,945
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 6,159 1,126 10,520
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 4,908 7,573 231
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities $ 2,337 $ 6,590 $ 0