Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Dec. 31, 2014
Current Fiscal Year End Date			--12-31
Transfer from operating properties to operating properties and related assets held for sale			$ 86,775	$ 0
Transfer from projects under development to operating properties			3,132	0
Net income	$ 7,951	$ 2,614	15,155	9,748
Adjustments to reconcile net loss to net cash provided by operating activities:
(Gain) loss on sale of investment properties, including discontinued operations			(21)	7,867
Depreciation and amortization, including discontinued operations			70,381	69,354
Amortization of deferred financing costs			716	604
Net amortization of stock options and restricted stock			808	1,059
Effect of certain non-cash adjustments to rental revenues			(15,047)	(15,139)
Income Loss from Unconsolidated Joint Ventures			3,372	3,313
Operating distributions from unconsolidated joint ventures			1,820	3,165
Residential Lot Outparcel and Multi Family Cost of Sales Net of Closing Costs Paid			0	255
Changes in other operating assets and liabilities:
Change in other receivables and other assets, net			(10,106)	(680)
Change in operating liabilities			(15,311)	(7,133)
Net cash provided by operating activities			45,065	50,053
CASH FLOWS FROM INVESTING ACTIVITIES:
Proceeds from investment property sales			9,164	29,050
Property acquisition, development, and tenant asset expenditures			(73,344)	(70,730)
Investment in unconsolidated joint ventures			(3,443)	(7,752)
Distributions from unconsolidated joint ventures			1,649	4,112
Change in notes receivable and other assets			772	(2,332)
Change in restricted cash			(652)	(1,094)
Net cash used in investing activities			(65,854)	(48,746)
CASH FLOWS FROM FINANCING ACTIVITIES:
Proceeds from credit facility			114,100	213,325
Repayment of credit facility			(52,300)	(172,950)
Repayment of notes payable			(4,371)	(4,617)
Payments of Financing Costs				3,176	$ 0
Proceeds from the Issuance of Common Stock, including Option Exercises			9	98,519
Preferred Stock Redemption			0	(94,775)
Common dividends paid			(34,677)	(29,115)
Preferred dividends paid			0	(2,955)
Distributions to noncontrolling interests			0	(281)
Net cash provided by financing activities			22,761	3,975
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS			1,972	5,282
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD			0	975	975
CASH AND CASH EQUIVALENTS AT END OF PERIOD	1,972	6,257	1,972	6,257	$ 0
Interest paid, net of amounts capitalized			15,477	14,256
Accrued property acquisition, development, and tenant asset expenditures	$ 416	$ 999	$ 416	$ 999