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Derivatives And Hedging Activities (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Jun. 30, 2017
Mar. 31, 2017
Jun. 30, 2016
Derivative [Line Items]      
Net unrealized loss on foreign currency derivatives designated as cash flow hedges $ (1.6)    
Foreign Exchange Forward [Member]      
Derivative [Line Items]      
Notional amount of derivative contracts 15.8 $ 33.0 $ 9.6
Cash Flow Hedging [Member] | Interest Rate Swap [Member]      
Derivative [Line Items]      
Notional amount of derivative contracts $ 370.0