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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 |  |
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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) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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