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Derivative Financial Instruments and Hedging Activities - Narrative (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2015
Derivative [Line Items]          
Deferred unrealized losses $ 1,900 $ 9,200 $ 8,800 $ 10,800  
Deferred unrealized losses, tax 100 $ 500 500 700  
Amortization of accumulated losses on cash flow hedges from AOCL to Other income (expense), net, projection     $ (8,291) $ (10,026)  
Projected amortization of unrealized losses from AOCL to earnings, coming twelve months $ 300        
Forecast [Member]          
Derivative [Line Items]          
Amortization of accumulated losses on cash flow hedges from AOCL to Other income (expense), net, projection         $ 1,800