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Derivative Instruments (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Dec. 31, 2015
Derivative [Line Items]        
Intercompany debt designated as a non-derivative net investment hedging instrument $ 12,500,000   $ 12,500,000 $ 11,800,000
Gain (loss) currency translation adjustment $ 0 $ 100,000    
Foreign Currency Derivatives        
Derivative [Line Items]        
Notional amounts of foreign currency derivatives       $ 33,200,000
Maximum | Foreign Currency Derivatives        
Derivative [Line Items]        
Derivative maturities     September, 2016