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INVESTMENTS IN AND ADVANCES TO UNCONSOLIDATED AFFILIATES (Details) ft² in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2015 USD ($) ft² | Sep. 30, 2015 USD ($) | Jun. 30, 2015 USD ($) | Mar. 31, 2015 USD ($) | Dec. 31, 2014 USD ($) | Sep. 30, 2014 USD ($) | Jun. 30, 2014 USD ($) | Mar. 31, 2014 USD ($) | Dec. 31, 2015 USD ($) ft² partner | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($) | Apr. 30, 2015
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of properties of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 24,043 | $ 102,855 | $ 0 |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |
Real estate under development | $ 609,574 |  |  |  | $ 447,390 |  |  |  | 609,574 | 447,390 |  |
Investments in and advances to unconsolidated affiliates | 173,277 |  |  |  | 184,352 |  |  |  | 173,277 | 184,352 |  |
Total assets | 3,032,319 |  |  |  | 2,720,721 |  |  |  | 3,032,319 | 2,720,721 |  |
Other liabilities | 31,000 |  |  |  | 25,148 |  |  |  | 31,000 | 25,148 |  |
Total liabilities and equity | 3,032,319 |  |  |  | 2,720,721 |  |  |  | 3,032,319 | 2,720,721 |  |
Company's share of distributions in excess of income and investments in unconsolidated affiliates | (13,244) |  |  |  | (12,564) |  |  |  | (13,244) | (12,564) |  |
Combined and Condensed Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues | 54,768 | $ 56,852 | $ 53,161 | $ 52,481 | 51,156 | $ 47,660 | $ 49,511 | $ 46,685 | 217,262 | 195,012 | 168,286 |
Operating and other expenses |  |  |  |  |  |  |  |  | (154,601) | (128,749) | (113,907) |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 13,287 | 8,723 | 12,382 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (60,751) | (49,645) | (40,299) |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | (135) | (335) | (765) |
Income from continuing operations |  |  |  |  |  |  |  |  | 149,970 | 150,924 | 26,503 |
Unconsolidated Affiliates [Member] |  |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |
Rental property, net | 302,976 |  |  |  | 387,739 |  |  |  | 302,976 | 387,739 |  |
Real estate under development | 35,743 |  |  |  | 60,476 |  |  |  | 35,743 | 60,476 |  |
Investments in and advances to unconsolidated affiliates | 6,853 |  |  |  | 11,154 |  |  |  | 6,853 | 11,154 |  |
Other assets | 47,083 |  |  |  | 62,862 |  |  |  | 47,083 | 62,862 |  |
Total assets | 392,655 |  |  |  | 522,231 |  |  |  | 392,655 | 522,231 |  |
Mortgage notes payable | 192,684 |  |  |  | 315,897 |  |  |  | 192,684 | 315,897 |  |
Other liabilities | 21,945 |  |  |  | 66,116 |  |  |  | 21,945 | 66,116 |  |
Partners’ equity | 178,026 |  |  |  | 140,218 |  |  |  | 178,026 | 140,218 |  |
Total liabilities and equity | $ 392,655 |  |  |  | $ 522,231 |  |  |  | 392,655 | 522,231 |  |
Combined and Condensed Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 43,990 | 44,422 | 51,638 |
Operating and other expenses |  |  |  |  |  |  |  |  | (13,721) | (17,069) | (18,700) |
Interest expense |  |  |  |  |  |  |  |  | (9,178) | (9,363) | (8,943) |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 66,655 | (328) | 13,651 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (12,154) | (10,967) | (10,599) |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | 0 | (187) | 0 |
Gain on disposition of properties |  |  |  |  |  |  |  |  | 32,623 | 142,615 | 0 |
Income from continuing operations |  |  |  |  |  |  |  |  | 108,215 | 149,123 | 27,047 |
Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 37,330 | 111,578 | 12,382 |
Company’s share of net income |  |  |  |  |  |  |  |  | 37,722 | 111,970 | 12,774 |
Amortization of excess investment |  |  |  |  |  |  |  |  | $ (392) | (392) | (392) |
KLA/Mervyns LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 10.50% |  |  |  |  |  |  |  | 10.50% |  |  |
KLA A Markets LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |
KA-Shopko LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |
Marsh and Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 20.00% |  |  |  |  |  |  |  | 20.00% |  |  |
KLAC Rex Venture LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 13.30% |  |  |  |  |  |  |  | 13.30% |  |  |
Mervyns I and Mervyns II [Member] | KLA/Mervyns LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 5.80% |  |  |  |  |  |  |  | 5.80% |  |  |
Mervyns II [Member] | KLA A Markets LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 6.00% |  |  |  |  |  |  |  | 6.00% |  |  |
Mervyns II [Member] | KLAC Rex Venture LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 13.30% |  |  |  |  |  |  |  | 13.30% |  |  |
Fund II [Member] | KA-Shopko LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 2.00% |  |  |  |  |  |  |  | 2.00% |  |  |
Fund II [Member] | Marsh and Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 3.30% |  |  |  |  |  |  |  | 3.30% |  |  |
KLA/Mervyns LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 10.50% |  |  |  |  |  |  |  | 10.50% |  |  |
KLA/Mervyns LLC [Member] | Mervyns I and Mervyns II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 5.80% |  |  |  |  |  |  |  | 5.80% |  |  |
KLA A Markets LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 18.90% |  |  |  |  |  |  |  | 18.90% |  |  |
KLA A Markets LLC [Member] | Mervyns II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Acadia Investors Ownership Percentage | 5.70% |  |  |  |  |  |  |  | 5.70% |  |  |
Parkway Crossing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Net sales proceeds |  |  |  |  |  |  |  |  | $ 27,300 |  |  |
Core Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of properties of unconsolidated affiliates |  |  |  |  |  |  |  |  | 0 | 0 |  |
Combined and Condensed Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | 150,015 | 125,022 | 110,355 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 1,169 | (77) | (99) |
Depreciation and amortization |  |  |  |  |  |  |  |  | (46,223) | (35,875) | (28,989) |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | $ 0 | (3) | (309) |
Income from continuing operations |  |  |  |  |  |  |  |  |  | 16,497 | 4 |
Core Portfolio [Member] | Chicago, Illinois [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Equity method investment, ownership percentage | 88.43% |  |  |  |  |  |  |  | 88.43% |  |  |
Square footage of real estate property (in square feet) | ft² | 87 |  |  |  |  |  |  |  | 87 |  |  |
Core Portfolio [Member] | White Plains, New York [Member] |  |  |  |  |  |  |  |  |  |  |  |
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) | ft² | 311 |  |  |  |  |  |  |  | 311 |  |  |
Core Portfolio [Member] | Georgetown Portfolio [Member] |  |  |  |  |  |  |  |  |  |  |  |
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) | ft² | 28 |  |  |  |  |  |  |  | 28 |  |  |
Core Portfolio [Member] | Route 202 Shopping Center [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Square footage of real estate property (in square feet) | ft² | 20 |  |  |  |  |  |  |  | 20 |  |  |
Percentage of voting interests acquired | 77.78% |  |  |  |  |  |  |  | 77.78% |  |  | 77.78%
Fund II [Member] | City Point Tower I [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Percentage of voting interests acquired | 43.00% |  |  |  |  |  |  |  | 43.00% |  |  |
Opportunity Funds [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of properties of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 24,043 | 102,855 |  |
Number of unaffiliated partners | partner |  |  |  |  |  |  |  |  | 2 |  |  |
Combined and Condensed Statements of Operations [Abstract] |  |  |  |  |  |  |  |  |  |  |  |
Total revenues |  |  |  |  |  |  |  |  | $ 49,048 | 54,659 | 46,131 |
Equity in earnings (losses) of unconsolidated affiliates |  |  |  |  |  |  |  |  | 12,118 | 8,800 | 12,481 |
Depreciation and amortization |  |  |  |  |  |  |  |  | (14,528) | (13,770) | (11,310) |
Loss on debt extinguishment |  |  |  |  |  |  |  |  | (135) | (332) | (456) |
Income from continuing operations |  |  |  |  |  |  |  |  |  | $ 120,011 | $ 14,699 |
Opportunity Funds [Member] | KLAC Rex Venture LLC [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 1,200 |  |  |
Opportunity Funds [Member] | RCP Venture [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 155,503 |  |  |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | $ 63,216 |  |  |  |  |  |  |  | 63,216 |  |  |
Opportunity Funds [Member] | RCP Venture [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 33,354 |  |  |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | 12,070 |  |  |  |  |  |  |  | 12,070 |  |  |
Opportunity Funds [Member] | Mervyns I and Mervyns II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 5,900 |  |  |
Opportunity Funds [Member] | Mervyns I and Mervyns II [Member] | KLA/Mervyns LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 7,547 |  |  |  |  |  |  |  | 7,547 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 9,272 |  |  |
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] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 1,252 |  |  |  |  |  |  |  | 1,252 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 2,017 |  |  |
Opportunity Funds [Member] | Mervyns II [Member] | KLA A Markets LLC Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 2,416 |  |  |  |  |  |  |  | 2,416 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 4,864 |  |  |
Opportunity Funds [Member] | Mervyns II [Member] | KLA A Markets LLC Add-On Investments [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 388 |  |  |  |  |  |  |  | 388 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 972 |  |  |
Opportunity Funds [Member] | Mervyns II [Member] | KLAC Rex Venture LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 2,701 |  |  |  |  |  |  |  | 2,701 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 4,927 |  |  |
Opportunity Funds [Member] | Mervyns II [Member] | KLAC Rex Venture LLC [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 535 |  |  |  |  |  |  |  | 535 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 986 |  |  |
Opportunity Funds [Member] | Fund II [Member] | KA-Shopko LLC [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 1,110 |  |  |  |  |  |  |  | 1,110 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 3,358 |  |  |
Opportunity Funds [Member] | Fund II [Member] | KA-Shopko LLC [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 222 |  |  |  |  |  |  |  | 222 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 672 |  |  |
Opportunity Funds [Member] | Fund II [Member] | Marsh and Add-On Investments [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 2,667 |  |  |  |  |  |  |  | 2,667 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 2,941 |  |  |
Opportunity Funds [Member] | Fund II [Member] | Marsh and Add-On Investments [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Invested Capital and Advances, cost method investments | 533 |  |  |  |  |  |  |  | 533 |  |  |
Distributions, cost method investments |  |  |  |  |  |  |  |  | 588 |  |  |
Opportunity Funds [Member] | KLA/Mervyns LLC [Member] | Mervyns I and Mervyns II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 48,547 |  |  |
Invested Capital and Advances, equity method investment | 26,058 |  |  |  |  |  |  |  | 26,058 |  |  |
Opportunity Funds [Member] | KLA/Mervyns LLC [Member] | Mervyns I and Mervyns II [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 11,801 |  |  |
Invested Capital and Advances, equity method investment | 4,901 |  |  |  |  |  |  |  | 4,901 |  |  |
Opportunity Funds [Member] | KLA A Markets LLC [Member] | Mervyns II [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 81,594 |  |  |
Invested Capital and Advances, equity method investment | 20,717 |  |  |  |  |  |  |  | 20,717 |  |  |
Opportunity Funds [Member] | KLA A Markets LLC [Member] | Mervyns II [Member] | Operating Partnership, as General Partner or Managing Member [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Distributions, equity method investments |  |  |  |  |  |  |  |  | 16,318 |  |  |
Invested Capital and Advances, equity method investment | 4,239 |  |  |  |  |  |  |  | 4,239 |  |  |
Fund IV [Member] | Warwick, Rhode Island [Member] |  |  |  |  |  |  |  |  |  |  |  |
Combined and Condensed Balance Sheets |  |  |  |  |  |  |  |  |  |  |  |
Investments in and advances to unconsolidated affiliates | $ 8,300 |  |  |  |  |  |  |  | 8,300 |  |  |
Fund III [Member] | Parkway Crossing [Member] |  |  |  |  |  |  |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Gain on disposition of properties of unconsolidated affiliates |  |  |  |  |  |  |  |  | $ 6,900 |  |  |

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