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FAIR VALUE MEASUREMENTS - Recurring Basis (Details)	12 Months Ended
	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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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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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.

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