Organization and Basis of Presentation - Accumulated Other Comprehensive Loss Summary (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	$ 6,337,023
Balance at period end	6,183,902
AOCI Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	(42,011)
Other comprehensive (loss) income before reclassification	(3,288)
Amounts reclassified from accumulated other comprehensive loss	5,204
Other comprehensive income (loss)	1,916
Balance at period end	(40,095)
Change in fair value and amortization of swap settlements
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	(48,366)
Other comprehensive (loss) income before reclassification	(4,618)
Amounts reclassified from accumulated other comprehensive loss	7,985
Other comprehensive income (loss)	3,367
Balance at period end	(44,999)
Unrealized gains on available for sale securities
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	6,355
Other comprehensive (loss) income before reclassification	1,330
Amounts reclassified from accumulated other comprehensive loss	(2,781)
Other comprehensive income (loss)	(1,451)
Balance at period end	$ 4,904