Income Taxes (Tax Effects of Temporary Differences and Carryforwards Included in Net Deferred Tax Liabilities) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Aug. 31, 2004
Tax effects of temporary differences and carryforwards included in the net deferred tax liabilities
Property, primarily differences in depreciation and amortization, the tax basis of land assets and the treatment of interests and certain costs	$ (406,023,000)	$ (309,775,000)	$ (310,756,000)
Operating loss and interest deduction carryforwards	398,859,000	377,645,000	366,590,000
Expense accruals and other	15,355,000	13,421,000	13,984,000
Valuation allowance	(352,528,000)	(331,458,000)	(326,837,000)
Deferred Tax Liabilities, Net	(344,337,000)	(250,167,000)	(257,019,000)
Deferred tax assets	0	0	2,700,000
Increase (decrease) in net deferred tax liability	94,200,000	(6,900,000)
Net difference between tax bases and the reported amount of REIT assets and liabilities	4,100,000,000	4,700,000,000
Period during which subject built-in gains tax (in years)	10 years
NOL carryforward related to TRS entities	363,200,000
NOL carryforward related to REIT	717,300,000
Holiday Retirement
Business Acquisition [Line Items]
Net deferred tax liability				$ 107,700,000