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FINANCIAL INSTRUMENTS AND FAIR VALUE MEASUREMENTS Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis (Details) | 1 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 USD ($) | Dec. 31, 2015 USD ($) derivative | Dec. 31, 2014 USD ($) | Dec. 31, 2013 USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset Impairment Charges |  | $ 5,000,000 | $ 0 | $ 8,183,000
Sales Price |  | 327,903,000 |  |
Variable rate debt |  | 1,050,051,000 | 991,502,000 |
Accumulated other comprehensive income - unrealized income (loss) on valuation of swap agreements |  | (4,500,000) | (4,000,000) |
Cash flow hedge gain (loss) to be reclassified within 12 months |  | $ 4,300,000 |  |
Cash Flow Hedging [Member] | Variable-Rate Derivatives [Member] | Maximum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, cap interest rate |  | 4.00% |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, notional amount |  | $ 256,500,000 |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Minimum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, fixed interest rate |  | 0.70% |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Fixed-Rate Derivatives, Maturing between March 2015 and April 2023 [Member] | Maximum [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, fixed interest rate |  | 5.62% |  |
Cash Flow Hedging [Member] | Interest Rate Swap [Member] | Variable-Rate Derivatives [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, notional amount |  | $ 29,500,000 |  |
Cash Flow Hedging [Member] | Forward Contracts [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative, number of instruments held | derivative |  | 1 |  |
Variable rate debt |  | $ 50,000,000 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 0 |  |
Derivative financial instruments, liabilities |  | 0 |  |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 818,000 | 200,000 |
Derivative financial instruments, liabilities |  | 5,876,000 | $ 4,600,000 |
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Derivative financial instruments, assets |  | 0 |  |
Derivative financial instruments, liabilities |  | 0 |  |
Fund III [Member] | Walnut Hill Plaza [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset Impairment Charges |  |  |  | 1,500,000
Fund III [Member] | Sheepshead Bay [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset Impairment Charges |  |  |  | $ 6,700,000
Sales Price | $ 20,200,000 |  |  |
Brandywine Portfolio [Member] |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Asset Impairment Charges |  | $ 5,000,000 |  |

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- Definition Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41271-113958 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13433-108611 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 45 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6945355&loc=d3e41228-113958 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=49121117&loc=d3e13495-108611 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=51825145&loc=SL20226008-175313 + Details
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