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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

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