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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) (USD $) | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended |  |  | 3 Months Ended |  | 3 Months Ended | 9 Months Ended | 3 Months Ended | 9 Months Ended |  | 1 Months Ended | 9 Months Ended | 3 Months Ended |
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Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011 | Dec. 31, 2011 | Sep. 30, 2012 Unconsolidated Affiliates | Sep. 30, 2011 Unconsolidated Affiliates | Sep. 30, 2012 Unconsolidated Affiliates | Sep. 30, 2011 Unconsolidated Affiliates | Dec. 31, 2011 Unconsolidated Affiliates | Sep. 30, 2012 Operating Partnership, as General Partner or Managing Member | Sep. 30, 2011 Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Operating Partnership, as General Partner or Managing Member | Sep. 30, 2011 Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Pending or Threatened Litigation [Member] | Sep. 30, 2008 Pending or Threatened Litigation [Member] claim | Sep. 30, 2008 Pending or Threatened Litigation [Member] Transfer of Mervyns' Assets [Member] claim | Sep. 30, 2012 KLA/Mervyns LLC Add-On Investments | Sep. 30, 2012 KLA A Markets LLC Add-On Investments | Sep. 30, 2012 KA-Shopko LLC | Sep. 30, 2012 Marsh and Add-On Investments | Sep. 30, 2012 KLAC Rex Venture LLC | Sep. 30, 2012 Mervyns I and Mervyns II Pending or Threatened Litigation [Member] | Sep. 30, 2012 Mervyns I and Mervyns II Carrying (Reported) Amount, Fair Value Disclosure Pending or Threatened Litigation [Member] | Sep. 30, 2012 Mervyns I and Mervyns II Estimate of Fair Value, Fair Value Disclosure Pending or Threatened Litigation [Member] | Sep. 30, 2012 Mervyns I and Mervyns II KLA/Mervyns LLC Add-On Investments | Sep. 30, 2012 Mervyns II KLA A Markets LLC Add-On Investments | Sep. 30, 2012 Mervyns II KLAC Rex Venture LLC | Sep. 30, 2012 Fund II KA-Shopko LLC | Sep. 30, 2012 Fund II Marsh and Add-On Investments | Sep. 30, 2012 KLA/Mervyns LLC | Sep. 30, 2012 KLA/Mervyns LLC Mervyns I and Mervyns II | Sep. 30, 2012 KLA A Markets LLC | Sep. 30, 2012 KLA A Markets LLC Mervyns II | Sep. 30, 2012 Core Portfolio | Sep. 30, 2011 Core Portfolio | Sep. 30, 2012 Core Portfolio | Sep. 30, 2011 Core Portfolio | Sep. 30, 2012 Core Portfolio Brandywine Portfolio sqft | Sep. 30, 2012 Core Portfolio Crossroads sqft | Sep. 30, 2012 Core Portfolio Georgetown Portfolio sqft | Sep. 30, 2012 Opportunity Funds | Sep. 30, 2011 Opportunity Funds | Sep. 30, 2012 Opportunity Funds | Sep. 30, 2011 Opportunity Funds | Sep. 30, 2012 Opportunity Funds RCP Venture | Sep. 30, 2012 Opportunity Funds RCP Venture Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds Mervyns I and Mervyns II KLA/Mervyns LLC Add-On Investments | Sep. 30, 2012 Opportunity Funds Mervyns I and Mervyns II KLA/Mervyns LLC Add-On Investments Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds Mervyns II KLA A Markets LLC Add-On Investments | Sep. 30, 2012 Opportunity Funds Mervyns II KLA A Markets LLC Add-On Investments Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds Mervyns II KLAC Rex Venture LLC | Sep. 30, 2012 Opportunity Funds Mervyns II KLAC Rex Venture LLC Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds Fund II KA-Shopko LLC | Sep. 30, 2012 Opportunity Funds Fund II KA-Shopko LLC Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds Fund II Marsh and Add-On Investments | Sep. 30, 2012 Opportunity Funds Fund II Marsh and Add-On Investments Operating Partnership, as General Partner or Managing Member | Jun. 30, 2010 Opportunity Funds Fund III locations | Aug. 31, 2012 Opportunity Funds Fund III Arundel Plaza Glen Burnie, Maryland sqft | Sep. 30, 2012 Opportunity Funds KLA/Mervyns LLC Mervyns I and Mervyns II | Sep. 30, 2012 Opportunity Funds KLA/Mervyns LLC Mervyns I and Mervyns II Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds KLA A Markets LLC Mervyns II | Sep. 30, 2012 Opportunity Funds KLA A Markets LLC Mervyns II Operating Partnership, as General Partner or Managing Member | Sep. 30, 2012 Opportunity Funds White Oak Fund III | Sep. 30, 2012 Opportunity Funds Equity Investment Controlled by Unaffiliated Venture Partner Fund III
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Ownership Percentage |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 22.20% | 49.00% | 50.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 50.00% |  |  |  |  |  | 84.00% | 49.00%
Square Footage of Real Estate Property (in square feet) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,000,000 | 311,000 | 28,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 265,000 |  |  |  |  |  |
Noncontrolling Interest, Ownership Percentage by Parent |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 10.50% | 20.00% | 20.00% | 20.00% | 13.30% |  |  |  | 5.80% | 6.00% | 13.30% | 2.00% | 3.30% | 10.50% | 5.80% | 18.90% | 5.70% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment and Investment Income, Dividends or Distributions |  |  | $ 3,900,000 |  |  |  |  |  |  |  |  |  | $ 800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,300,000 | 5,500,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 26,058,000 | 4,901,000 | 20,717,000 | 4,239,000 |  |
Loss contingency, pending claims, number |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5 | 4 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement agreement, consideration amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 163,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, claimant amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,175,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement agreement, net cost after tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 143,600,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Loss contingency, settlement agreement, amount applicable to equity method after applying cash on hand |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, expense |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 1,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Litigation settlement, expense, net of tax |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity Method Investment, Dividends or Distributions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 45,966,000 | 11,251,000 | 81,594,000 | 16,318,000 |  |
Cost Method Investments |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,517,000 | 1,046,000 | 2,416,000 | 388,000 | 2,701,000 | 535,000 | 1,108,000 | 222,000 | 2,667,000 | 533,000 |  |  |  |  |  |  |  |
Investment Income, Dividend |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 141,817,000 | 30,528,000 | 3,558,000 | 819,000 | 4,778,000 | 955,000 | 1,623,000 | 325,000 | 1,659,000 | 332,000 | 2,639,000 | 528,000 |  |  |  |  |  |  |  |
Equity Method Investment, Net Sales Proceeds |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 13,800,000 |
Business Acquisition, Percentage of Voting Interests Acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 90.00% |  |  |  |  |  |
Equity Method Investment, Note Receivable, Amount |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,200,000
Equity Method Investment, Note Receivable, Interest Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00%
Number of Locations Owned (in locations) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 14 |  |  |  |  |  |  |
Assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Rental property, net |  |  |  |  |  | 296,390,000 |  | 296,390,000 |  | 280,470,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 88,572,000 |  | 88,572,000 |  | 84,568,000 | 89,099,000 |  | 89,099,000 |  | 156,421,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 62,184,000 | 11,864,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other assets |  |  |  |  |  | 40,554,000 |  | 40,554,000 |  | 29,587,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total assets | 1,899,583,000 | 1,606,467,000 | 1,899,583,000 | 1,606,467,000 | 1,653,319,000 | 426,043,000 |  | 426,043,000 |  | 466,478,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 786,041,000 | 614,100,000 | 786,041,000 | 614,100,000 |  |  |  | 993,046,000 | 875,623,000 | 993,046,000 | 875,623,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Liabilities and Equity |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Mortgage notes payable |  |  |  |  |  | 318,568,000 |  | 318,568,000 |  | 319,425,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other liabilities | 23,514,000 |  | 23,514,000 |  | 19,735,000 | 28,323,000 |  | 28,323,000 |  | 16,902,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Partners' equity |  |  |  |  |  | 79,152,000 |  | 79,152,000 |  | 130,151,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total liabilities and equity | 1,899,583,000 |  | 1,899,583,000 |  | 1,653,319,000 | 426,043,000 |  | 426,043,000 |  | 466,478,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of distributions in excess of share of income and investments in unconsolidated affiliates | (22,409,000) |  | (22,409,000) |  | (21,710,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Statements of Operations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 44,141,000 | 35,869,000 | 124,742,000 | 110,301,000 |  | 11,903,000 | 10,290,000 | 36,121,000 | 30,789,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 17,917,000 | 14,277,000 | 50,193,000 | 42,820,000 |  |  |  | 17,340,000 | 13,614,000 | 48,183,000 | 39,674,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Operating and other expenses | 31,555,000 | 25,806,000 | 87,774,000 | 76,345,000 |  | 4,977,000 | 3,699,000 | 13,793,000 | 10,993,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense |  |  |  |  |  | 4,603,000 | 4,274,000 | 13,854,000 | 12,532,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Equity in (losses) earnings of unconsolidated affiliates | (2,538,000) | 3,110,000 | 1,997,000 | 3,025,000 |  | 1,398,000 | 13,472,000 | 6,244,000 | 13,060,000 |  | (2,538,000) | 3,110,000 | 1,997,000 | 3,025,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization | 10,365,000 | 8,183,000 | 29,326,000 | 23,960,000 |  | 2,573,000 | 2,222,000 | 7,216,000 | 6,467,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 4,712,000 | 3,547,000 | 12,954,000 | 10,475,000 |  |  |  | 4,732,000 | 3,745,000 | 13,673,000 | 10,980,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Gain on Disposition of Property |  |  |  |  |  | 0 | 0 | 3,402,000 | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Income from continuing operations | 637,000 | 3,771,000 | 11,284,000 | 11,022,000 |  | 1,148,000 | 13,567,000 | 10,904,000 | 13,857,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Company's share of net income (loss) |  |  |  |  |  |  |  |  |  |  | (2,440,000) | 3,208,000 | 2,291,000 | 3,318,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Amortization of excess investment |  |  |  |  |  |  |  |  |  |  | $ (98,000) | $ (98,000) | $ (294,000) | $ (293,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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