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Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Gains Related to Fair of Debt (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]        
Foreign exchange (losses) gains $ 2,139 $ (4,211) $ 6,761 $ (12,359)