INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Summary of Investments in Unconsolidated Affiliates (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Real estate under development	$ 575,195		$ 575,195		$ 447,390
Investments in and advances to unconsolidated affiliates	162,101		162,101		184,352
Total assets	2,968,084		2,968,084		2,732,600
Other liabilities	32,431		32,431		25,148
Total liabilities and equity	2,968,084		2,968,084		2,732,600
Distributions in excess of income from, and investments in, unconsolidated affiliates	(13,406)		(13,406)		(12,564)
Total revenues	56,852	$ 47,660	162,494	$ 143,856
Operating Expenses	(37,917)	(32,431)	(115,372)	(95,072)
Equity in earnings of unconsolidated affiliates	2,195	2,923	12,194	7,382
Depreciation and amortization	(17,461)	(12,884)	(45,022)	(36,055)
Loss on debt extinguishment	0	0	(134)	(269)
Income from continuing operations	18,104	111,072	142,099	141,495
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Rental property, net	299,577		299,577		387,739
Real estate under development	0		0		60,476
Investments in and advances to unconsolidated affiliates	7,548		7,548		11,154
Other assets	62,563		62,563		62,862
Total assets	369,688		369,688		522,231
Loans Payable to Bank	224,425		224,425		315,897
Other liabilities	12,568		12,568		66,116
Partners’ equity	132,695		132,695		140,218
Total liabilities and equity	369,688		369,688		$ 522,231
Total revenues	10,712	10,280	32,727	34,632
Operating Expenses	(3,022)	(3,840)	(9,855)	(13,158)
Interest Expense	(2,183)	(1,808)	(7,080)	(7,308)
Equity in earnings of unconsolidated affiliates	0	0	66,655	(328)
Depreciation and amortization	(2,791)	(2,275)	(7,828)	(8,456)
Loss on debt extinguishment	0	0	0	(187)
Gain (Loss) On Disposition Of Property Of Equity Method Investment	7,416	142,377	32,623	142,615
Income from continuing operations	10,132	144,734	107,242	147,810
Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated affiliates	9,133	105,778	36,237	110,237
Company’s share of net income	9,231	105,876	36,531	110,531
Amortization of Excess Investment	$ (98)	$ (98)	$ (294)	$ (294)