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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities - Net Cash (Receipts) Payments Included In Cash From Operating Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Foreign exchange contracts      
Derivative [Line Items]      
Net (receipts) payments $ 5,797 $ (9,073) $ 0