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FAIR VALUE MEASUREMENTS - Recurring Basis (Details) | 12 Months Ended
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Dec. 31, 2015 USD ($) derivative_instrument | Dec. 31, 2014 USD ($) derivative_instrument | Dec. 31, 2013 USD ($)
Assets: |  |  |
Available-for-sale securities |  | $ 20,512,000 |
Liabilities: |  |  |
Interest rate swaps | $ 434,000 | 2,226,000 |
Net realized gains and losses on sale of available-for-sale securities | 16,560,000 | 0 | $ 0
Proceeds from sale of available-for-sale securities | 20,755,000 |  |
Fair value of mortgage and other indebtedness | 4,945,622,000 | 4,947,026,000 |
Mortgage and other indebtedness | 4,710,628,000 | 4,683,333,000 |
Common Stock |  |  |
Assets: |  |  |
Available-for-sale securities |  | 20,516,000 |
Liabilities: |  |  |
Adjusted cost | $ 4,195,000 | $ 4,195,000 |
Interest Rate Swap | Fair Value, Measurements, Recurring |  |  |
Liabilities: |  |  |
Number of instruments held | derivative_instrument | 4 | 4 |
Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Assets: |  |  |
Available-for-sale securities |  | $ 20,512,000 |
Liabilities: |  |  |
Interest rate swaps | $ 0 | 0 |
Significant Other Observable Inputs (Level 2) |  |  |
Assets: |  |  |
Available-for-sale securities |  | 0 |
Liabilities: |  |  |
Interest rate swaps | 434,000 | 2,226,000 |
Significant Unobservable Inputs (Level 3) |  |  |
Assets: |  |  |
Available-for-sale securities |  | 0 |
Liabilities: |  |  |
Interest rate swaps | $ 0 | $ 0 |

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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27357-111563 + Details
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- Definition Sum of the carrying values as of the balance sheet date of all debt, including all short-term borrowings, long-term debt, and capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03.13,16) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03.16) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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