Equity and Capital - Accumulated Other Comprehensive Income (Loss) (Details) (USD $) In Thousands, except Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accumulated Other Comprehensive Income (Loss) [Line Items]
Document Fiscal Year Focus	2013
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	$ (9,433)	$ (9,491)	$ (9,467)
Weighted Average Limited Partnership Units Outstanding, Basic	171,886,000	177,164,000	177,164,000
Loss on Settlement of Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(61,991)
Net gain on cash flow derivative instruments	0
Amounts reclassified from accumulated other comprehensive income	9,449
Current period other comprehensive income, net	9,449
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(52,542)
Fair Value of Derivative Instruments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	4,276
Net gain on cash flow derivative instruments	30,878
Amounts reclassified from accumulated other comprehensive income	(16)
Current period other comprehensive income, net	30,862
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	35,138
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(57,715)
Net gain on cash flow derivative instruments	30,878
Amounts reclassified from accumulated other comprehensive income	9,433
Current period other comprehensive income, net	40,311
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(17,404)
Parent Company [Member]
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning of Period	(57,715)
Current period other comprehensive income, net	40,418	13,711	9,485
Accumulated Other Comprehensive Income (Loss), Net of Tax, End of Period	(17,404)	(57,715)
Parent Company [Member] | Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Current period other comprehensive income, net	$ 40,311	$ 13,714	$ 9,456