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Hedging Instruments (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
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 $ 5,800        
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       $ 210,400 $ 176,500
Unrealized loss on net investment hedge $ (2,216) $ (1,093)      
Series C Senior Note [Member]          
Derivative [Line Items]          
Debt instrument, face amount | €     € 88,900,000    
Stated interest rate     1.785% 1.785%