INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Summary of Investments in Unconsolidated Affiliates (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 2014
Schedule of Equity Method Investments [Line Items]
Real estate under development	$ 484,676us-gaap_DevelopmentInProcess		$ 447,390us-gaap_DevelopmentInProcess
Investments in and advances to unconsolidated affiliates	184,500		184,352
Total assets	2,870,866us-gaap_Assets		2,732,600us-gaap_Assets
Other liabilities	27,196us-gaap_OtherLiabilities		25,148us-gaap_OtherLiabilities
Total liabilities and equity	2,870,866		2,732,600
Distributions in excess of income from, and investments in, unconsolidated affiliates	(12,361)		(12,564)
Total revenues	52,481us-gaap_RealEstateRevenueNet	46,685us-gaap_RealEstateRevenueNet
Operating Expenses	(37,333)us-gaap_OperatingExpenses	(31,964)us-gaap_OperatingExpenses
Equity in earnings of unconsolidated affiliates	6,593	3,029
Depreciation and amortization	(13,658)us-gaap_DepreciationAndAmortization	(11,587)us-gaap_DepreciationAndAmortization
Loss on debt extinguishment	(109)	(203)
Net income	38,537	19,115
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Rental property, net	388,590		387,739
Real estate under development	66,942		60,476
Investments in and advances to unconsolidated affiliates	7,548		11,154
Other assets	63,288		62,862
Total assets	526,368		522,231
Loans Payable to Bank	317,103		315,897
Other liabilities	71,551		66,116
Partners’ equity	137,714		140,218
Total liabilities and equity	526,368		522,231
Total revenues	11,930	12,105
Operating Expenses	(3,857)	(3,815)
Interest Expense	(2,638)	(2,524)
Equity in earnings of unconsolidated affiliates	66,655	(328)
Depreciation and amortization	(2,307)	(2,706)
Loss on debt extinguishment	0	(187)
Net income	69,783	2,545
Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Equity in earnings of unconsolidated affiliates	6,593	3,029
Company’s share of net income	6,691	3,127
Amortization of Excess Investment	$ (98)	$ (98)

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