Information by Business Segment (Details2) (USD $) In Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Reconciliation of segment revenues to total revenues
Segment revenues from real estate operations	$ 125,129	$ 115,028	$ 368,376	$ 338,015
Construction contract and other service revenues	18,729	13,608	67,854	77,038
Less: Revenues from discontinued operations	(3,236)	(3,954)	(9,434)	(12,344)
Total revenues	140,622	124,682	426,796	402,709
Reconciliation of segment property operating expenses to property operating expenses
Property operating expenses	48,712	44,304	145,071	132,744
Less: Property operating expenses from discontinued operations	(1,057)	(1,291)	(3,784)	(4,413)
Total property operating expenses	47,655	43,013	141,287	128,331
Computation of net operating income from service operations
Construction contract and other service revenues	18,729	13,608	67,854	77,038
Construction contract and other service expenses	(18,171)	(13,347)	(65,698)	(75,148)
NOI from service operations	558	261	2,156	1,890
Reconciliation of NOI from real estate operations and NOI from service operations to (loss) income from continuing operations
NOI from real estate operations	76,417	70,724	223,305	205,271
NOI from service operations	558	261	2,156	1,890
Interest and other (loss) income	(242)	395	3,682	1,942
Equity in loss of unconsolidated entities	(159)	648	(223)	371
Income tax benefit (expense)	457	(27)	6,043	(75)
Other adjustments:
Depreciation and other amortization associated with real estate operations	(35,719)	(29,503)	(97,720)	(84,368)
Impairment losses			(57,824)
General and administrative expenses	(6,154)	(6,079)	(19,251)	(17,905)
Business development expenses	(1,050)	(2,886)	(2,126)	(3,506)
Interest expense on continuing operations	(25,381)	(26,174)	(78,412)	(74,042)
NOI from discontinued operations	(2,179)	(2,663)	(5,650)	(7,931)
Loss on early extinguishment of debt	(1,655)		(1,680)
Income (loss) from continuing operations	$ 4,893	$ 4,696	$ (27,700)	$ 21,647