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Derivative Instruments and Hedging Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Derivative instruments and hedging activity for the period [Abstract]      
Impact of foreign exchange rates on debt instruments recorded in Other Comprehensive Income $ (28,871) $ 6,989 $ 7,542
Forward Exchange Contracts [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Amount of gain (loss) reclassified into net earnings $ (200) (1,100)  
Forward Exchange Contracts [Member] | Maximum [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Number of months for contracts to mature 18 months    
Forward Exchange Contracts [Member] | Cash Flow Hedging [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Derivative, fair value $ 44,900 25,400  
Foreign Currency Denominated Debt, Net Investment Hedging [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Carrying value of foreign denominated debt 261,900 195,600  
Impact of foreign exchange rates on debt instruments recorded in Other Comprehensive Income $ (28,871) $ 6,989