Condensed Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Statement of Cash Flows [Abstract]
Net income	$ 7,132	$ 56,904
Adjustments to reconcile net loss to net cash provided by operating activities:
Gain on sale of investment properties, including discontinued operations	6,526	57,272
Depreciation and amortization, including discontinued operations	34,168	12,299
Amortization of deferred financing costs	295	279
Amortization of stock options and restricted stock, net	(587)	(361)
Effect of certain non-cash adjustments to rental revenues	(9,074)	(1,806)
Income Loss from Unconsolidated Joint Ventures	1,286	1,652
Operating distributions from unconsolidated joint ventures	1,777	1,417
Land and multi-family cost of sales, net of closing costs paid	0	904
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net	(3,024)	(1,581)
Change in operating liabilities	(17,042)	(8,083)
Net cash provided by operating activities	7,007	1,770
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales	19,970	112,651
Property acquisition, development and tenant asset expenditures	(36,653)	(295,789)
Investment in unconsolidated joint ventures	(2,659)	(19)
Distributions from unconsolidated joint ventures	2,370	39,563
Collection of notes receivable	0	339
Change in notes receivable and other assets	(993)	(1,221)
Change in restricted cash	(668)	(764)
Net cash provided by (used in) investing activities	(18,633)	(145,240)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility	82,525	102,000
Repayment of credit facility	(122,600)	(47,000)
Proceeds from other notes payable	0	1,166
Repayment of notes payable	(2,577)	(75,139)
Proceeds from Issuance of Common Stock	98,544	0
Common dividends paid	(14,231)	(4,689)
Preferred dividends paid	(1,777)	(3,227)
Distributions to noncontrolling interests	(153)	(491)
Net cash provided by (used in) financing activities	39,731	(27,380)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	28,105	(170,850)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	975	176,892
CASH AND CASH EQUIVALENTS AT END OF PERIOD	29,080	6,042
INTEREST PAID, NET OF AMOUNTS CAPITALIZED	$ 7,186	$ 5,470