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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
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets $ 1,633 $ 1,650 $ 2,211
Not Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 109 0 0
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 251 2,268 381
Not Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 17 0 0
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 5,500 947 4,729
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative assets 8,723 1,126 3,454
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities 2,164 7,573 2,034
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]      
Derivatives, Fair Value [Line Items]      
Fair value of derivative liabilities $ 449 $ 6,590 $ 1,186