Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 125,629	$ 53,008	$ 126,829
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on sale of investment properties, including discontinued operations	(79,843)	(31,894)	(68,200)
Gain on sale of third party management and leasing business	0	0	(4,577)
Depreciation and amortization, including discontinued operations	135,462	141,022	76,478
Amortization of deferred financing costs	1,423	604	615
Net amortization of stock options and restricted stock	1,473	1,992
Amortization of stock options and restricted stock, net			1,898
Effect of certain non-cash adjustments to rental revenues	(26,475)	(30,039)	(11,660)
Income from unconsolidated joint ventures	(8,302)	(11,268)	(67,325)
Operating distributions from unconsolidated joint ventures	8,760	10,296	67,101
Land and multi-family cost of sales, net of closing costs paid	0	302	967
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net	(10,937)	(644)	(9,619)
Change in operating liabilities	4,471	9,021	24,833
Net cash provided by operating activities	151,661	142,400	137,340
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales	225,307	244,471	178,966
Proceeds from sale of third party management and leasing business	0	0	4,577
Property acquisition, development and tenant asset expenditures	(184,988)	(710,743)	(1,526,263)
Investment in unconsolidated joint ventures	(9,985)	(18,342)	(11,922)
Distributions from unconsolidated joint ventures	7,555	26,179	88,635
Change in notes receivable and other assets	118	(1,819)	(75)
Change in restricted cash	475	(1,361)	(111)
Net cash provided by (used in) investing activities	38,482	(461,615)	(1,266,193)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility	355,900	764,575	365,075
Repayment of credit facility	(404,100)	(664,450)	(325,000)
Proceeds from notes payable	0	85,068	304,275
Repayment of notes payable	(22,851)	(22,943)	(77,887)
Payment of loan issuance costs	0	(3,995)	(1,693)
Common stock issued, net of expenses	8	321,845	826,233
Payments for Repurchase of Common Stock	(47,790)	0	0
Common dividends paid	(69,196)	(61,555)	(27,192)
Preferred dividends paid	0	(2,955)	(10,008)
Preferred Stock Redemption	0	(94,775)	(74,827)
Distributions to nonredeemable noncontrolling interests	(111)	(2,575)	(26,040)
Net cash provided by (used in) financing activities	(188,140)	318,240	952,936
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	2,003	(975)	(175,917)
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	0	975	176,892
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 2,003	$ 0	$ 975