Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Accumulated Other Comprehensive Income Loss [Line Items]
Document Fiscal Year Focus			2014
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (2,275)	$ (2,366)	$ (4,749)	$ (4,732)
Accumulated Other Comprehensive Income Loss [Roll Forward]
Net gain (loss) on cash flow derivative instruments	(24,669)	21,664	(24,669)	21,664
Amounts reclassified from other comprehensive income			4,749	4,732
Loss on Settlement of Derivative Instruments [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(52,542)	(61,991)
Net gain (loss) on cash flow derivative instruments	0	0	0	0
Amounts reclassified from other comprehensive income			4,524	4,724
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax			0
Current period other comprehensive income, net			4,524	4,724
Ending balance	(48,018)	(57,267)	(48,018)	(57,267)
Fair Value of Derivative Instruments [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			35,138	4,276
Net gain (loss) on cash flow derivative instruments	(24,669)	21,664	(24,669)	21,664
Amounts reclassified from other comprehensive income			225	8
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax			0
Current period other comprehensive income, net			(24,444)	21,672
Ending balance	10,694	25,948	10,694	25,948
Unrealized Gain (Loss) on Available-for-Sale Securities [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			0
Net gain (loss) on cash flow derivative instruments	0		0
Amounts reclassified from other comprehensive income			0
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax			912
Current period other comprehensive income, net			912
Ending balance	912		912
Accumulated Other Comprehensive Income (Loss) [Member]
Accumulated Other Comprehensive Income Loss [Roll Forward]
Beginning balance			(17,404)	(57,715)
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Net of Tax			912
Current period other comprehensive income, net			(19,008)	26,396
Ending balance	$ (36,412)	$ (31,319)	$ (36,412)	$ (31,319)