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Derivatives (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Dec. 31, 2015
Derivatives, Fair Value [Line Items]          
Hedge ineffectiveness $ 0 $ 0 $ 0 $ 0  
Amounts excluded from effectiveness testing recognized in earnings on cash flow hedges 0 $ 0 0 $ 0  
Unrealized pretax loss for cash flow hedging instruments reclassified into earnings     89,000    
Foreign exchange gross notional amount 0   0    
Foreign Currency Contracts, Liability, Fair Value Disclosure $ 0   $ 0   $ 78,000
Designated as Hedging Instrument          
Derivatives, Fair Value [Line Items]          
Foreign exchange gross notional amount         $ 1,800,000
Minimum          
Derivatives, Fair Value [Line Items]          
Derivative, Term of Contract     1 day    
Maximum          
Derivatives, Fair Value [Line Items]          
Derivative, Term of Contract     5 days