Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 47,919	$ (123,467)	$ (12,033)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Impairment losses, including discontinued operations	14,278	107,763	2,554
Gain on sale of investment properties, including discontinued operations	(15,001)	(12,013)	(9,164)
Gain on sale of third party management and leasing business	(7,459)	0	0
Losses on abandoned predevelopment projects	0	937	829
Loss on extinguishment of debt	94	74	592
Impairment losses on investment in unconsolidated joint ventures	0	608	0
Depreciation and amortization, including discontinued operations	52,439	54,061	59,956
Amortization of deferred financing costs	1,056	1,637	2,074
Stock-based compensation	2,244	2,113	2,348
Effect of certain non-cash adjustments to rental revenues	(3,938)	(6,719)	(5,142)
(Income) loss from unconsolidated joint ventures	(39,258)	17,691	(9,493)
Operating distributions from unconsolidated joint ventures	37,379	8,865	11,394
Land and multi-family cost of sales, net of closing costs paid	1,706	5,187	35,743
Land and multi-family acquisition and development expenditures	(47)	(999)	(3,272)
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net	(851)	2,099	3,870
Change in operating liabilities	4,761	(2,256)	(560)
Net cash provided by operating activities	95,322	55,581	79,696
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales	273,386	143,623	101,706
Proceeds from sale of third party management and leasing business	8,247	0	0
Property acquisition, development and tenant asset expenditures	(105,069)	(181,909)	(33,761)
Investment in unconsolidated joint ventures	(6,619)	(23,341)	(26,229)
Distributions from unconsolidated joint ventures	67,435	8,428	16,024
Change in notes receivable and other assets	2,504	(2,255)	(1,229)
Change in restricted cash	2,077	10,592	(12,409)
Payment of debt guarantee for unconsolidated joint venture	0	0	(17,250)
Net cash provided by (used in) investing activities	241,961	(44,862)	26,852
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility	417,900	256,275	100,300
Repayment of credit and term facilities	(616,150)	(163,425)	(134,900)
Proceeds from other notes payable	113,026	0	27,034
Repayment of notes payable	(28,808)	(59,543)	(73,133)
Payment of loan issuance costs	(3,419)	(442)	(1,996)
Common stock issued, net of expenses	0	18	(95)
Common dividends paid	(18,748)	(18,649)	(12,176)
Preferred dividends paid	(12,907)	(12,907)	(12,907)
Contributions from noncontrolling interests	0	1,300	2,237
Distributions to noncontrolling interests	(16,143)	(16,087)	(2,777)
Net cash used in financing activities	(165,249)	(13,460)	(108,413)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	172,034	(2,741)	(1,865)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	4,858	7,599	9,464
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 176,892	$ 4,858	$ 7,599