Organization and Basis of Presentation - Accumulated Other Comprehensive Loss Summary (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2016 USD ($)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	$ 6,337,023
Balance at period end	6,215,076
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	(3,209)
Amounts reclassified from accumulated other comprehensive loss	2,213
Other comprehensive (loss) income	(996)
Balance at period end	(43,007)
Accumulated Net Gain (Loss) from Cash Flow Hedges Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	(48,366)
Other comprehensive (loss) income before reclassification	(5,286)
Amounts reclassified from accumulated other comprehensive loss	3,995
Other comprehensive (loss) income	(1,291)
Balance at period end	(49,657)
Accumulated Net Investment Gain (Loss) Including Portion Attributable to Noncontrolling Interest [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Balance at period beginning	6,355
Other comprehensive (loss) income before reclassification	2,077
Amounts reclassified from accumulated other comprehensive loss	(1,782)
Other comprehensive (loss) income	295
Balance at period end	$ 6,650