Quarterly report pursuant to Section 13 or 15(d)

Financial Instruments and Risk Management (Gross Notional Amount of Outstanding Derivatives) (Details)

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Financial Instruments and Risk Management (Gross Notional Amount of Outstanding Derivatives) (Details) - Foreign Exchange Forward [Member] - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 484,176 $ 417,707 $ 458,823
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 219,961 $ 326,280 $ 205,030