Condensed Consolidated Balance Sheets (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Document Fiscal Year Focus	2013
REAL ESTATE ASSETS:
Operating properties, net of accumulated depreciation of $255,128 and $289,473 in 2012 and 2011, respectively	$ 1,828,437,000	$ 669,652,000
Projects under development, net of accumulated depreciation of $183 in 2012	21,681,000	25,209,000
Land	35,053,000	42,187,000
Other	0	151,000
Total properties	1,885,171,000	737,199,000
Assets Held-for-sale, Long Lived	24,554,000	1,866,000
CASH AND CASH EQUIVALENTS	975,000	176,892,000
RESTRICTED CASH	2,810,000	2,852,000
NOTES AND ACCOUNTS RECEIVABLE, net of allowance for doubtful accounts of $1,743 and $5,100 in 2012 and 2011, respectively	11,778,000	9,972,000
DEFERRED RENTS RECEIVABLE	39,969,000	39,378,000
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES	107,082,000	97,868,000
Intangible Assets, Current	170,973,000	33,280,000
OTHER ASSETS	29,894,000	24,935,000
TOTAL ASSETS	2,273,206,000	1,124,242,000
LIABILITIES AND EQUITY
NOTES PAYABLE	630,094,000	425,410,000
ACCOUNTS PAYABLE AND ACCRUED EXPENSES	76,668,000	34,751,000
Deferred Revenue, Current	25,754,000	11,888,000
Intangible Liabilities	66,476,000	7,520,000
OTHER LIABILITIES	15,242,000	1,720,000
TOTAL LIABILITIES	814,234,000	481,289,000
COMMITMENTS AND CONTINGENT LIABILITIES	0	0
Preferred stock, 20,000,000 shares authorized, $1 par value:
Common stock, $1 par value, 250,000,000 shares authorized, 107,660,080 and 107,272,078 shares issued in 2012 and 2011, respectively	193,236,000	107,660,000
Additional paid-in capital	1,420,951,000	690,024,000
Treasury stock at cost, 3,570,082 shares in 2012 and 2011	(86,840,000)	(86,840,000)
Distributions in excess of cumulative net income	(164,721,000)	(260,104,000)
TOTAL STOCKHOLDERS’ INVESTMENT	1,457,401,000	620,342,000
Nonredeemable noncontrolling interests	1,571,000	22,611,000
TOTAL EQUITY	1,458,972,000	642,953,000
TOTAL LIABILITIES AND EQUITY	2,273,206,000	1,124,242,000
Series A Preferred Stock [Member]
Preferred stock, 20,000,000 shares authorized, $1 par value:
7.75% Series A cumulative redeemable preferred stock, $25 liquidation preference; 2,993,090 shares issued and outstanding in 2012 and 2011 and 7.50% Series B cumulative redeemable preferred stock, $25 liquidation preference; 3,791,000 shares issued and outstanding in 2012 and 2011	0	74,827,000
Series B Preferred Stock [Member]
Preferred stock, 20,000,000 shares authorized, $1 par value:
7.75% Series A cumulative redeemable preferred stock, $25 liquidation preference; 2,993,090 shares issued and outstanding in 2012 and 2011 and 7.50% Series B cumulative redeemable preferred stock, $25 liquidation preference; 3,791,000 shares issued and outstanding in 2012 and 2011	$ 94,775,000	$ 94,775,000