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Derivative Instruments and Hedging Activity (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Derivative instruments and hedging activity for the period [Abstract]      
Maximum number of months for forward exchange contracts to mature 18 months    
Impact of foreign exchange rates on debt instruments recorded in Other Comprehensive Income $ 7,542 $ 12,677 $ (4,020)
Forward Exchange Contracts [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Amount of gain (loss) reclassified into net earnings (1,200) 100  
Forward Exchange Contracts [Member] | Cash Flow Hedging [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Derivative, fair value 35,200 17,800  
Foreign Currency Denominated Debt, Net Investment Hedging [Member]      
Derivative instruments and hedging activity for the period [Abstract]      
Carrying value of foreign denominated debt $ 162,500 $ 97,300