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Derivatives and Hedging Activities (Fair Value Balance Sheet Disclosures) (Details) - Not Designated as a Hedging Instrument - Forward Exchange Contracts - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Fair value disclosues, by balance sheet location    
Current derivative assets $ 2,857 $ 892
Noncurrent derivative assets 249 15
Current derivative liabilities 682 3,418
Noncurrent derivative liabilities $ 0 $ 8