Summary of Significant Accounting Policies (Details 13) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Management Fees and Other Revenues
Insurance reserve for insurance subsidiaries and other self-insurance programs	$ 103,400,000	$ 112,800,000
Allowance for Credit Losses
Balance, beginning of period	33,130,000	27,500,000	31,650,000
Consolidation of previously unconsolidated properties		2,075,000	860,000
Provision for credit losses	7,737,000	12,809,000	6,505,000
Accounts written off, net of recoveries	(4,955,000)	(9,254,000)	(11,515,000)
Balance, end of period	35,912,000	33,130,000	27,500,000
Income Taxes
Provision for federal income taxes for REIT entities	0
Deferred tax assets related to TRS subsidiaries, net	1,100,000	4,100,000
Valuation allowance	$ 0