INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	$ 123,693,000		$ 123,693,000		$ 181,322,000
Assets
Real estate under development	398,727,000		398,727,000		337,353,000
Investments in and advances to unconsolidated affiliates	123,693,000		123,693,000		181,322,000
Total assets	2,454,651,000		2,454,651,000		2,264,957,000
Liabilities and partners’ equity
Other liabilities	20,334,000		20,334,000		18,265,000
Total liabilities and equity	2,454,651,000		2,454,651,000		2,264,957,000
Company’s investment in and advances to unconsolidated affiliates	123,693,000		123,693,000		181,322,000
Company's share of distributions in excess of income from, and investments in, unconsolidated affiliates	(8,416,000)		(8,416,000)		(8,701,000)
Combined and Condensed Statements of Operations
Total revenues	47,660,000	41,086,000	143,856,000	124,183,000
Operating and other expenses	(32,431,000)	(27,961,000)	(95,072,000)	(79,746,000)
Equity in (losses) earnings of unconsolidated affiliates	2,923,000	4,209,000	7,382,000	7,274,000
Depreciation and amortization	(12,884,000)	(10,450,000)	(36,055,000)	(29,278,000)
Loss on debt extinguishment	0	0	(269,000)	0
Gain on disposition of properties of unconsolidated affiliates	102,855,000	0	102,855,000	0
Income from continuing operations	111,072,000	6,553,000	141,495,000	20,348,000
Unconsolidated Affiliates
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	11,154,000		11,154,000		63,745,000
Assets
Rental property, net	235,949,000		235,949,000		380,268,000
Real estate under development	49,866,000		49,866,000		5,573,000
Investments in and advances to unconsolidated affiliates	11,154,000		11,154,000		63,745,000
Other assets	41,107,000		41,107,000		66,895,000
Total assets	338,076,000		338,076,000		516,481,000
Liabilities and partners’ equity
Mortgage notes payable	208,326,000		208,326,000		265,982,000
Other liabilities	51,611,000		51,611,000		43,733,000
Partners’ equity	78,139,000		78,139,000		206,766,000
Total liabilities and equity	338,076,000		338,076,000		516,481,000
Company’s investment in and advances to unconsolidated affiliates	11,154,000		11,154,000		63,745,000
Combined and Condensed Statements of Operations
Total revenues	10,280,000	13,731,000	34,632,000	35,577,000
Operating and other expenses	(3,840,000)	(4,139,000)	(13,158,000)	(13,117,000)
Interest and other finance expense	(1,808,000)	(2,359,000)	(7,308,000)	(6,446,000)
Equity in (losses) earnings of unconsolidated affiliates	0	1,284,000	(328,000)	7,154,000
Depreciation and amortization	(2,275,000)	(3,200,000)	(8,456,000)	(7,888,000)
Loss on debt extinguishment	0	0	(187,000)	0
Gain on disposition of properties of unconsolidated affiliates	142,377,000	0	142,615,000	0
Income from continuing operations	144,734,000	5,317,000	147,810,000	15,280,000
Operating Partnership, as General Partner or Managing Member
Combined and Condensed Statements of Operations
Equity in (losses) earnings of unconsolidated affiliates	105,778,000	4,209,000	110,237,000	7,274,000
Company’s share of net income	105,876,000	4,307,000	110,531,000	7,568,000
Amortization of excess investment	(98,000)	(98,000)	(294,000)	(294,000)
Core Portfolio
Schedule of Equity Method Investments [Line Items]
Purchase Price			243,709,000
Combined and Condensed Statements of Operations
Total revenues	31,291,000	28,115,000	91,974,000	82,252,000
Equity in (losses) earnings of unconsolidated affiliates	118,000	(49,000)	441,000	(96,000)
Depreciation and amortization	(9,330,000)	(7,890,000)	(25,963,000)	(21,187,000)
Loss on debt extinguishment			0
Gain on disposition of properties of unconsolidated affiliates	0		0
Income from continuing operations		735,000	15,625,000	3,319,000
Core Portfolio | Crossroads
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	49.00%		49.00%
Square footage of real estate property (in square feet)	311,000		311,000
Core Portfolio | Georgetown Portfolio
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	50.00%		50.00%
Square footage of real estate property (in square feet)	28,000		28,000
Core Portfolio | Route 202 Shopping Center [Member]
Schedule of Equity Method Investments [Line Items]
Equity method investment, ownership percentage	22.22%		22.22%
Square footage of real estate property (in square feet)	20,000		20,000
Funds
Schedule of Equity Method Investments [Line Items]
Number of unaffiliated partners			2
Combined and Condensed Statements of Operations
Total revenues	13,363,000	10,002,000	39,938,000	32,666,000
Equity in (losses) earnings of unconsolidated affiliates	2,805,000	4,258,000	6,941,000	7,370,000
Depreciation and amortization	(3,554,000)	(2,560,000)	(10,092,000)	(8,091,000)
Loss on debt extinguishment			(269,000)
Gain on disposition of properties of unconsolidated affiliates	102,855,000		102,855,000
Income from continuing operations		2,849,000	114,454,000	7,764,000
Funds | KLAC Rex Venture LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			1,200,000
Funds | KLAC Rex Venture LLC | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			500,000
Funds | Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	63,216,000		63,216,000
Distributions			147,849,000
Assets
Investments in and advances to unconsolidated affiliates	63,216,000		63,216,000
Liabilities and partners’ equity
Company’s investment in and advances to unconsolidated affiliates	63,216,000		63,216,000
Funds | Corporate Joint Venture | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	12,070,000		12,070,000
Distributions			31,787,000
Assets
Investments in and advances to unconsolidated affiliates	12,070,000		12,070,000
Liabilities and partners’ equity
Company’s investment in and advances to unconsolidated affiliates	12,070,000		12,070,000
Funds | Mervyns I
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			700,000
Funds | Mervyns I and Mervyns II | KLA/Mervyns LLC Add-On Investments
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	7,547,000		7,547,000
Distributions			5,789,000
Funds | Mervyns I and Mervyns II | KLA/Mervyns LLC Add-On Investments | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	1,252,000		1,252,000
Distributions			1,284,000
Funds | Mervyns II
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			800,000
Funds | Mervyns II | KLA A Markets LLC Add-On Investments
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	2,416,000		2,416,000
Distributions			4,864,000
Funds | Mervyns II | KLA A Markets LLC Add-On Investments | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	388,000		388,000
Distributions			972,000
Funds | Mervyns II | KLAC Rex Venture LLC
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	2,701,000		2,701,000
Distributions			1,956,000
Funds | Mervyns II | KLAC Rex Venture LLC | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	535,000		535,000
Distributions			392,000
Funds | Fund II | KA-Shopko LLC
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	1,110,000		1,110,000
Distributions			2,460,000
Funds | Fund II | KA-Shopko LLC | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	222,000		222,000
Distributions			492,000
Funds | Fund II | Marsh and Add-On Investments
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	2,667,000		2,667,000
Distributions			2,639,000
Funds | Fund II | Marsh and Add-On Investments | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments	533,000		533,000
Distributions			528,000
Funds | KLA/Mervyns LLC | Mervyns I and Mervyns II
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			48,547,000
Invested Capital and Advances, equity method investments	26,058,000		26,058,000
Funds | KLA/Mervyns LLC | Mervyns I and Mervyns II | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			11,801,000
Invested Capital and Advances, equity method investments	4,901,000		4,901,000
Funds | KLA A Markets LLC | Mervyns II
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			81,594,000
Invested Capital and Advances, equity method investments	20,717,000		20,717,000
Funds | KLA A Markets LLC | Mervyns II | Operating Partnership, as General Partner or Managing Member
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment			16,318,000
Invested Capital and Advances, equity method investments	4,239,000		4,239,000
Fund IV
Schedule of Equity Method Investments [Line Items]
Purchase Price			59,225,000
Fund IV | Lincoln Road Portfolio | Miami, FL
Schedule of Equity Method Investments [Line Items]
Investment, aggregate sales price	200,200,000
Number Of Properties Sold	3
Gain (Loss) on Sale of Investments	54,600,000
Fund IV | Savannah, GA
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	7,800,000		7,800,000
Investments in affiliates subsidiaries associates and joint ventures, loan commitment	69,000,000		69,000,000
Number of properties acquired			24
Purchase Price			33,900,000
Assets
Investments in and advances to unconsolidated affiliates	7,800,000		7,800,000
Liabilities and partners’ equity
Company’s investment in and advances to unconsolidated affiliates	7,800,000		7,800,000
Fund IV | Bear, DE
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances	25,400,000		25,400,000
Assets
Investments in and advances to unconsolidated affiliates	25,400,000		25,400,000
Liabilities and partners’ equity
Company’s investment in and advances to unconsolidated affiliates	25,400,000		25,400,000
Fund IV | Corporate Joint Venture | Savannah, GA
Schedule of Equity Method Investments [Line Items]
Investments in affiliates subsidiaries associates and joint ventures, loan commitment	25,900,000		25,900,000
Fund III | Lincoln Road Portfolio | Miami, FL
Schedule of Equity Method Investments [Line Items]
Investment, aggregate sales price	141,800,000
Number Of Properties Sold	3
Gain (Loss) on Sale of Investments	$ 86,700,000