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Derivative Instruments, Hedging Activities and Fair Value (Details 5) - Fair value measurements recurring - Level 2 - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Assets    
Foreign currency forward exchange contracts $ 5,283 $ 5,244
Liabilities    
Foreign currency forward exchange contracts 9,227 7,123
Interest rate swaps    
Assets    
Cross-currency interest rate swaps 3,189 634
Liabilities    
Interest rate swaps $ 612 $ 1,368