Income Taxes (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax liabilities:
Partnership differences	$ 50,290	$ 29,745
Deferred revenue	25,596	23,139
Capitalized interest	11,424	16,157
Other	49	0
Total deferred tax liabilities	87,359	69,041
Deferred tax assets:
Net operating, capital and other loss carryforwards	62,651	66,145
Differences in basis of real estate	35,604	33,321
Receivables	440	1,183
Accruals and expenses	9,272	9,398
Tax credit carryforwards	12,905	7,724
Management contracts and other	393	629
Total deferred tax assets	121,265	118,400
Valuation allowance	(3,553)	(4,531)
Net deferred income tax assets	30,353	44,828
Reconciliation of unrecognized tax benefits
Balance at January 1	3,536	3,917	4,071
Reductions as a result of a lapse of the applicable statutes	(764)	(684)	0
Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation	99	303
Additions (reductions) based on tax positions related to prior years and current year excess benefits related to stock-based compensation			(154)
Balance at December 31	$ 2,871	$ 3,536	$ 3,917