Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
REAL ESTATE ASSETS:
Operating properties, net of accumulated depreciation of $255,128 and $289,473 in 2012 and 2011, respectively	$ 669,652	$ 884,652
Projects under development, net of accumulated depreciation of $183 in 2012	25,209	11,325
Land	42,187	67,327
Other	151	637
Total properties	737,199	963,941
OPERATING PROPERTY AND RELATED ASSETS HELD FOR SALE, net of accumulated depreciation of $2,947 in 2012	1,866	0
CASH AND CASH EQUIVALENTS	176,892	4,858
RESTRICTED CASH	2,852	4,929
NOTES AND ACCOUNTS RECEIVABLE, net of allowance for doubtful accounts of $1,743 and $5,100 in 2012 and 2011, respectively	9,972	11,359
DEFERRED RENTS RECEIVABLE	39,378	37,141
INVESTMENT IN UNCONSOLIDATED JOINT VENTURES	97,868	160,587
OTHER ASSETS	58,215	52,720
TOTAL ASSETS	1,124,242	1,235,535
LIABILITIES AND EQUITY
NOTES PAYABLE	425,410	539,442
ACCOUNTS PAYABLE AND ACCRUED EXPENSES	34,751	29,682
DEFERRED INCOME	11,888	17,343
OTHER LIABILITIES	9,240	8,910
TOTAL LIABILITIES	481,289	595,377
COMMITMENTS AND CONTINGENT LIABILITIES
REDEEMABLE NONCONTROLLING INTERESTS	0	2,763
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	107,660	107,272
Additional paid-in capital	690,024	687,835
Treasury stock at cost, 3,570,082 shares in 2012 and 2011	(86,840)	(86,840)
Distributions in excess of cumulative net income	(260,104)	(274,177)
TOTAL STOCKHOLDERS’ INVESTMENT	620,342	603,692
Nonredeemable noncontrolling interests	22,611	33,703
TOTAL EQUITY	642,953	637,395
TOTAL LIABILITIES AND EQUITY	1,124,242	1,235,535
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	74,827	74,827
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	$ 94,775