Investment In Real Estate Joint Ventures And Partnerships (Combined Condensed Statements Of Operations) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	$ 131,577,000	$ 118,597,000	$ 258,279,000	$ 233,213,000
Expenses:
Depreciation and amortization	38,190,000	32,465,000	76,895,000	64,731,000
Interest, net	28,772,000	28,628,000	46,175,000	59,359,000
Operating	25,003,000	22,906,000	49,452,000	44,520,000
Real estate taxes, net	15,444,000	13,976,000	30,104,000	27,268,000
General and administrative	6,194,000	6,378,000	12,861,000	14,685,000
Provision for income taxes	197,000	(279,000)	33,000	(313,000)
Impairment loss	165,000	2,536,000	221,000	9,388,000
Total	84,996,000	78,261,000	169,533,000	160,592,000
Operating income (loss)	24,522,000	(3,126,000)	67,396,000	10,485,000
Unconsolidated Real Estate Joint Ventures [Member]
Investment In Real Estate Joint Ventures And Partnerships [Line Items]
Revenues, net	41,099,000	50,026,000	83,260,000	99,873,000
Expenses:
Depreciation and amortization	11,558,000	15,481,000	23,579,000	31,617,000
Interest, net	7,415,000	8,961,000	14,960,000	18,047,000
Operating	7,407,000	8,571,000	13,561,000	17,196,000
Real estate taxes, net	5,013,000	6,159,000	9,596,000	12,397,000
General and administrative	164,000	225,000	450,000	586,000
Provision for income taxes	86,000	95,000	148,000	168,000
Impairment loss	13,000	96,498,000	1,828,000	96,498,000
Total	31,656,000	135,990,000	64,122,000	176,509,000
Operating income (loss)	$ 9,443,000	$ (85,964,000)	$ 19,138,000	$ (76,636,000)