Annual report pursuant to Section 13 and 15(d)

Financial Instruments and Risk Management (Balance Sheet Classification and Fair Value of Derivative Instruments) (Details)

v3.20.4
Financial Instruments and Risk Management (Balance Sheet Classification and Fair Value of Derivative Instruments) (Details) - Forward Contracts [Member] - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Not Designated as Hedging Instrument [Member] | Prepaid Expenses And Other Current Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets $ 1,650 $ 2,146
Not Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 2,268 953
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 947 11,855
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Noncurrent Assets [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative assets 1,126 4,159
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Accrued Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities 7,573 1,313
Cash Flow Hedging [Member] | Designated as Hedging Instrument [Member] | Other Long Term Liabilities [Member]    
Derivatives, Fair Value [Line Items]    
Fair value of derivative liabilities $ 6,590 $ 768