Quarterly report pursuant to Section 13 or 15(d)

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

v3.21.2
Financial Instruments and Risk Management (Gross Notional Amount of Outstanding Derivatives) (Details) - Foreign Exchange Forward [Member] - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Sep. 30, 2020
Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 471,250 $ 417,707 $ 419,402
Not Designated as Hedging Instrument [Member]      
Derivatives, Fair Value [Line Items]      
Derivative, Notional Amount $ 247,134 $ 326,280 $ 224,573