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Derivative Instruments and Hedging Activities Derivative Instruments and Hedging Activities Gain or Loss Recognized Related to Cash Flow hedges (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Derivative [Line Items]        
Amount of gain (loss) related to the effective portion recognized in other comprehensive loss $ 5,712 $ (30,156) $ (85,285) $ (18,050)
Amount of loss related to the effective portion subsequently reclassified to earnings (1,190) (627) (2,445) (1,882)
Amount of loss related to the ineffective portion and amount excluded from effectiveness testing $ (140) $ 0 $ (140) $ 0