INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES - Funds (Details) $ in Thousands	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2015 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2014 USD ($)	Jun. 30, 2015 USD ($) partner	Jun. 30, 2014 USD ($)	Dec. 31, 2014 USD ($)
Schedule of Equity Method Investments [Line Items]
Investments in and advances to unconsolidated affiliates		$ 166,632		$ 166,632		$ 184,352
Gain on disposition of property of unconsolidated affiliates		17,105	$ 0	$ 17,105	$ 0
White City
Schedule of Equity Method Investments [Line Items]
Net sales proceeds	$ 96,800
Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Number of unaffiliated partners | partner				2
Gain on disposition of property of unconsolidated affiliates		17,105		$ 17,105
Fund III | White City
Schedule of Equity Method Investments [Line Items]
Gain on disposition of property of unconsolidated affiliates	$ 17,300
Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				48,547
Equity Method Investments		26,058		26,058
Mervyns I | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				5,700
Mervyns II | Opportunity Funds | KLA A Markets LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				81,594
Equity Method Investments		$ 20,717		$ 20,717
Corporate Joint Venture
Schedule of Equity Method Investments [Line Items]
Gain on the disposition of property		10.00%		10.00%
Corporate Joint Venture | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions				$ 155,303
Investments in and advances to unconsolidated affiliates		$ 63,216		63,216
KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		7,547		7,547
Distributions				9,272
KLAC Rex Venture LLC | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,701		2,701
Distributions				4,727
KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,416		2,416
Distributions				4,864
KA-Shopko LLC | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		1,110		1,110
Distributions				3,358
Marsh and Add-On Investments | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		2,667		2,667
Distributions				2,941
Operating Partnership, as General Partner or Managing Member | Mervyns I and Mervyns II | Opportunity Funds | KLA/Mervyns LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				11,801
Equity Method Investments		4,901		4,901
Operating Partnership, as General Partner or Managing Member | Mervyns II | Opportunity Funds | KLA A Markets LLC
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				16,318
Equity Method Investments		4,239		4,239
Operating Partnership, as General Partner or Managing Member | Corporate Joint Venture | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions				33,314
Investments in and advances to unconsolidated affiliates		12,070		12,070
Operating Partnership, as General Partner or Managing Member | KLA/Mervyns LLC Add-On Investments | Mervyns I and Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		1,252		1,252
Distributions				2,017
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Distributions, equity method investment				1,200
Operating Partnership, as General Partner or Managing Member | KLAC Rex Venture LLC | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		535		535
Distributions				946
Operating Partnership, as General Partner or Managing Member | KLA A Markets LLC Add-On Investments | Mervyns II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		388		388
Distributions				972
Operating Partnership, as General Partner or Managing Member | KA-Shopko LLC | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		222		222
Distributions				672
Operating Partnership, as General Partner or Managing Member | Marsh and Add-On Investments | Fund II | Opportunity Funds
Schedule of Equity Method Investments [Line Items]
Invested Capital and Advances, cost method investments		$ 533		533
Distributions				$ 588