Summary of Significant Accounting Policies (Details 5) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013 Item	Dec. 31, 2012	Dec. 31, 2011
Segment Disclosure
Number of reportable segments	1
Deferred costs and other assets
Deferred financing and lease costs, net	$ 344,970	$ 334,337
In-place lease intangibles, net	290,564	358,141
Acquired above market lease intangibles, net	98,723	128,893
Marketable securities of our captive insurance companies	94,720	119,424
Goodwill	20,098	20,098
Other marketable and non-marketable securities	173,887	150,264
Prepaids, notes receivable and other assets, net	496,852	459,577
Deferred costs and other assets	1,519,814	1,570,734
Deferred Financing and Lease Costs
Deferred financing and lease costs, gross	619,366	576,821
Accumulated amortization	(274,396)	(242,484)
Deferred financing and lease costs, net	344,970	334,337
Amortization, included in statements of operations and comprehensive income
Amortization of deferred financing costs	25,982	27,163	28,697
Amortization of debt premiums, net of discounts	(33,535)	(33,504)	(8,439)
Amortization of deferred leasing costs	$ 45,760	$ 43,176	$ 43,110