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FAIR VALUE MEASUREMENTS - Derivative Instruments, Gain (Loss) (Details) | 12 Months Ended
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Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) property item | Dec. 31, 2016 USD ($) | Dec. 31, 2015 USD ($) item
Cash flow hedges |  |  |  |
Reclassification of gain (loss) |  |  |  |
Gain or loss recognized with respect to cash flow hedges' ineffectiveness |  | $ 0 | $ 0 | $ 0
Properties located in Kansas City, Missouri and Ann Arbor, Michigan |  |  |  |
Reclassification of gain (loss) |  |  |  |
Number of real estate properties sold | property |  | 2 |  |
Properties located in Kansas City, Missouri and Ann Arbor, Michigan | Cash flow hedges |  |  |  |
Reclassification of gain (loss) |  |  |  |
Loss on derivative instrument reclassified into interest expense |  | $ 201,000 |  |
Interest rate swap | Cash flow hedges |  |  |  |
Fair Value Measurements |  |  |  |
Amount of (loss) gain recognized on derivatives in Other comprehensive income (loss) |  | (221,000) | 255,000 | (3,722,000)
Amount of (loss) reclassification from Accumulated other comprehensive income (loss) into Interest expense |  | $ (1,786,000) | (2,624,000) | $ (2,554,000)
Reclassification of gain (loss) |  |  |  |
Number of interest rate derivative instruments terminated | item |  | 3 |  | 1
Additional amount to be reclassified during the next twelve months | $ 565,000 |  |  |
Credit risk related contingent feature |  |  |  |
Fair value of derivative in a liability position, including accrued interest but excluding adjustments for nonperformance risk |  | $ 1,638,000 | 2,951,000 |
Accrued interest on derivative in a liability position |  | 53,000 | 113,000 |
Termination value of derivative agreement |  | $ 1,638,000 | 2,951,000 |
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures |  |  |  |
Fair Value Measurements |  |  |  |
Number of unconsolidated joint ventures of the entity with interest rate derivatives outstanding | item |  | 3 |  |
Percentage of ownership in unconsolidated joint venture |  | 50.00% |  |
Number interest rate derivatives outstanding | item |  | 2 |  |
Notional Amount |  | $ 10,491,000 |  |
Amount of (loss) gain recognized on derivatives in Other comprehensive income (loss) |  | 15,000 | (31,000) | $ (109,000)
Amount of (loss) reclassification from Accumulated other comprehensive income (loss) into Equity in earnings of unconsolidated joint ventures |  | $ (61,000) | (95,000) | (108,000)
Reclassification of gain (loss) |  |  |  |
Additional amount to be reclassified during the next twelve months | $ 7,000 |  |  |
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Minimum |  |  |  |
Fair Value Measurements |  |  |  |
Fixed Interest Rate (as a percent) |  | 3.49% |  |
Interest rate swap | Cash flow hedges | Unconsolidated joint ventures | Maximum |  |  |  |
Fair Value Measurements |  |  |  |
Fixed Interest Rate (as a percent) |  | 5.81% |  |
Interest rate swap | Cash flow hedges | Prepayment costs on debt |  |  |  |
Reclassification of gain (loss) |  |  |  |
Loss on termination of interest rate swap |  |  | 178,000 | $ 472,000
Interest rate swap | Cash flow hedges | Accrued expenses and other liabilities |  |  |  |
Credit risk related contingent feature |  |  |  |
Adjustments for nonperformance risk |  | $ 93,000 | $ 143,000 |

X
- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Represents the accrued interest portion of the derivative instrument. + References No definition available. + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into equity in earnings of unconsolidated joint ventures on derivative instruments designated and qualifying as hedging instruments. + References No definition available. + Details
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- Definition Number of interest rate derivate instruments terminated by the entity at the reporting date. + References No definition available. + Details
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- Definition The aggregate fair value of assets needed to immediately settle the derivative instruments with credit-risk-related contingent features if the credit-risk-related contingent features were triggered at the end of the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994 + Details
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- Definition The effective portion of net gain (loss) reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4D -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624177-113959 + Details
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- Definition The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 + Details
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- Definition The portion of losses on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624171-113959 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 25 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6886632&loc=d3e76258-113986 + Details
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- Definition The aggregate fair value amounts of derivative instruments that contain credit-risk-related contingent features that are in a net liability position at the end of the reporting period. For nonderivative instruments that are designated and qualify as hedging instruments, the fair value amounts are the carrying value of the nonderivative hedging instrument, including the adjustment for the foreign currency transaction gain (loss) on that instrument. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4H -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624258-113959 + Details
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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=66011266&loc=d3e33918-111571 + Details
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- Definition Gain (loss) related to the termination of a contract between the parties. The termination may be due to many causes including early termination of a lease by a lessee, a breach of contract by one party, or a failure to perform. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 420 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=6394359&loc=d3e17939-110869 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -URI http://asc.fasb.org/extlink&oid=66902209&loc=d3e3602-108585 + Details
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