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
		Mar. 31, 2016	Mar. 31, 2015
Derivative [Line Items]
Amount of loss related to the effective portion recognized in other comprehensive loss		$ (58,646)	$ (3,533)
Amount of loss related to the effective portion subsequently reclassified to earnings (1)	[1]	(627)	(627)
Amount of gain (loss) related to the ineffective portion and amount excluded from effectiveness testing		$ 0	$ 0

[1] Consists of amounts from previous interest rate hedging programs entered into prior to 2015.