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Hedging Instruments (Narrative) (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2017
EUR (€)
Jun. 30, 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     $ 800        
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           $ 194,700 $ 175,900
Unrealized (loss) gain on net investment hedge $ (3,767) $ 1,307 $ (4,860) $ (917)      
Series C Senior Note [Member]              
Derivative [Line Items]              
Debt instrument, face amount | €         € 88,900,000    
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