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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Assets:    
Derivative Assets $ 3,400 $ 3,200
Liabilities:    
Derivative Liabilities 1,800 1,100
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Assets:    
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Asset At Fair Value 1,175 1,534
Interest Rate Cash Flow Hedge Asset at Fair Value 0 545
Foreign Currency Cash Flow Hedge Asset at Fair Value 2,239 1,154
Liabilities:    
Foreign Currency Derivative Instruments Not Designated As Hedging Instruments Liability At Fair Value 878 1,059
Interest Rate Cash Flow Hedge Liability at Fair Value 411 27
Foreign Currency Cash Flow Hedge Liability at Fair Value $ 556 $ 0