Derivative Financial Instruments - Impact of Derivatives on the Statements of Changes in Stockholder's Equity (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss recognized in other comprehensive income	$ (26,699)	$ (28,842)	$ 0
Amount of loss reclassified in interest expense	0	0	(63,813)
Total change in other comprehensive income for unrealized losses on derivatives, before income tax benefit	(5,224)	(19,772)	0
Reclassification out of Accumulated Other Comprehensive Income | Realized Gain (Loss) on Derivatives
Derivative Instruments, Gain (Loss) [Line Items]
Amount of loss reclassified in interest expense	$ (21,475)	$ (9,070)	$ 0