INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended																		12 Months Ended						12 Months Ended						12 Months Ended					93 Months Ended	12 Months Ended	3 Months Ended	12 Months Ended			75 Months Ended	12 Months Ended		66 Months Ended		12 Months Ended			79 Months Ended		12 Months Ended					12 Months Ended
	Dec. 31, 2012 properties	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012 properties	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2012 Unconsolidated Affiliates [Member]	Dec. 31, 2011 Unconsolidated Affiliates [Member]	Dec. 31, 2010 Unconsolidated Affiliates [Member]	Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2011 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2010 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2012 KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2012 KA-Shopko LLC [Member]	Dec. 31, 2012 Marsh and Add-On Investments [Member]	Dec. 31, 2012 KLAC Rex Venture LLC [Member]	Dec. 31, 2012 KLA/Mervyns LLC [Member]	Dec. 31, 2012 KLA A Markets LLC [Member]	Dec. 31, 2012 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2012 Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Dec. 31, 2012 Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2012 Mervyns II [Member] KLAC Rex Venture LLC [Member]	Dec. 31, 2012 Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2012 Fund II [Member] KA-Shopko LLC [Member]	Dec. 31, 2012 Fund II [Member] Marsh and Add-On Investments [Member]	Dec. 31, 2012 Core Portfolio [Member]	Dec. 31, 2011 Core Portfolio [Member]	Dec. 31, 2010 Core Portfolio [Member]	Dec. 31, 2012 Core Portfolio [Member] Brandywine Portfolio [Member] sqft	Dec. 31, 2012 Core Portfolio [Member] Crossroads [Member] sqft	Dec. 31, 2012 Core Portfolio [Member] Georgetown Portfolio [Member] sqft	Dec. 31, 2012 Opportunity Funds [Member]	Dec. 31, 2011 Opportunity Funds [Member]	Dec. 31, 2010 Opportunity Funds [Member]	Dec. 31, 2012 Opportunity Funds [Member] RCP Venture [Member]	Dec. 31, 2012 Opportunity Funds [Member] RCP Venture [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2004 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member] stores	Dec. 31, 2012 Opportunity Funds [Member] Mervyns I and Mervyns II [Member] KLA/Mervyns LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member]	Jul. 31, 2007 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member] retail_properties	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLAC Rex Venture LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2011 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Jun. 30, 2006 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Mervyns II [Member] KLA A Markets LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] KA-Shopko LLC [Member] Operating Partnership, as General Partner or Managing Member [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] KA Marsh LLC [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] Add-On Investments [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member]	Dec. 31, 2012 Opportunity Funds [Member] Fund II [Member] Marsh and Add-On Investments [Member] Operating Partnership, as General Partner or Managing Member [Member]	Jun. 29, 2010 Opportunity Funds [Member] Fund II [Member] CityPoint [Member]	Jun. 30, 2011 Opportunity Funds [Member] Fund III [Member]
Schedule of Equity Method Investments [Line Items]
Equity Method Investment, Ownership Percentage																																				22.20%	49.00%	50.00%																														50.00%
Square Footage of Real Estate Property (in feet)																																				1,000,000	311,000	28,000
Number of Properties Collateralized	35								35
Number of Stores																																															262
Equity Method Investments																																														$ 23,200	$ 27,088	$ 4,901								$ 20,717		$ 20,717	$ 20,700	$ 4,239
Payments to Acquire Equity Method Investments									160,888	54,981	19,116																																			3,900
Equity Method Investment, Dividends or Distributions																																															45,966	11,251								2,400	4,500	81,680		16,318
Cost Method Investments																																												6,517	1,252				2,416	2,416	388	2,701	2,701	2,700	535						1,108	222	700	2,000	2,667	533
Investment Income, Dividend																																										142,236	30,612	3,558	819				3,100	4,778	972	1,100	1,956		392						1,659	332			2,639	528
Impairment of unconsolidated affiliates									2,032	0	0																200
Number of Retail Properties																																																						87
Noncontrolling Interest, Ownership Percentage by Parent																		10.50%	20.00%	20.00%	20.00%	13.30%	10.50%	18.90%	5.80%	5.80%		6.00%	13.30%	5.70%	2.00%	3.30%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage																																																																			24.75%
Combined and Condensed Balance Sheets
Rental property, net												441,611	280,470
Investments in and advances to unconsolidated affiliates	221,694				84,568				221,694	84,568		93,923	156,421																													63,214	12,070
Other assets												39,035	29,587
Total assets	1,908,440				1,653,319				1,908,440	1,653,319		574,569	466,478
Mortgage notes payable												326,296	319,425
Other liabilities	21,303				18,517				21,303	18,517		24,267	16,902
Partners’ equity												224,006	130,151
Total liabilities and partners’ equity	1,908,440				1,653,319				1,908,440	1,653,319		574,569	466,478
Company's share of distributions in excess of share of income and investments in unconsolidated affiliates	(22,707)				(21,710)				(22,707)	(21,710)
Combined and Condensed Statements of Operations [Abstract]
Total revenues	37,141	34,648	32,723	29,913	28,783	27,356	29,206	29,733	134,425	115,078	116,390	49,729	42,185	29,460																			70,599	57,994	57,084				54,286	43,994	38,721
Operating and other expenses									99,568	83,026	77,142	18,919	15,924	10,617
Interest expense												18,547	17,099	13,525
Equity in earnings of unconsolidated affiliates									550	1,555	12,450	583	7,243	56,482	1,579	1,555	10,971
Depreciation and amortization									32,931	25,672	23,419	9,551	8,837	4,839																			18,316	14,206	13,798				15,594	12,361	10,061
(Loss) gain on debt extinguishment									(198)	1,268	0	293	0	0
Gain (loss) on sale of property, net												3,402	0	(2,957)
Net income									10,554	5,058	47,147	6,404	7,568	54,004
Company’s share of net income															1,971	1,946	11,363
Amortization of excess investment															$ (392)	$ (391)	$ (392)