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Hedging Instruments (Narrative) (Details)
$ in Thousands, € in Millions
3 Months Ended
Mar. 31, 2017
USD ($)
Mar. 31, 2016
USD ($)
Mar. 31, 2017
EUR (€)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Derivative [Line Items]          
Estimated net amount of gains expected to be reclassified out of accumulated other comprehensive income and into earnings within next 12 months $ 2,500        
Cash Flow Hedge, hedge percentage of estimated exposure from intercompany products purchases and sales 85.00%        
General duration of foreign currency exchange contracts 24 months        
Notional Amount of Foreign Currency Exchange Contracts       $ 203,500 $ 175,900
Unrealized (loss) gain on net investment hedge $ (1,093) $ 2,224      
Series C Senior Note [Member]          
Derivative [Line Items]          
Debt instrument, face amount | €     € 88.9    
Stated interest rate     1.785% 1.785%  
Interest Rate Swap Effective On March 30, 2012 [Member]          
Derivative [Line Items]          
Fixed portion of interest rate associated with interest rate swap     1.36% 1.36%  
Credit Facility borrowings hedged       $ 40,000  
Interest Rate Swap Effective On March 28, 2013 [Member]          
Derivative [Line Items]          
Fixed portion of interest rate associated with interest rate swap     1.64% 1.64%  
Credit Facility borrowings hedged       $ 40,000