FAIR VALUE OF FINANCIAL INSTRUMENTS (Details 3)-K (USD $)	Dec. 31, 2014	Dec. 31, 2013
Liabilities:
Allowance, notes receivable	$ 471,000	$ 426,000
Variable-rate debt that has been swapped to a fixed rate	172,000,000
Fair Value, Measurements, Nonrecurring [Member] | Reported Value Measurement [Member]
Assets:
Cash and cash equivalents	485,424,000	894,948,000
Notes receivable, net	28,630,000	20,554,000
Tax indemnity receivable, including interest		320,494,000
Liabilities:
Fixed-rate debt	1,030,554,000	1,004,886,000
Variable-rate debt	962,916,000	509,737,000
Total mortgages, notes and loans payable	1,993,470,000	1,514,623,000
Fair Value, Measurements, Nonrecurring [Member] | Estimate of Fair Value Measurement [Member]
Assets:
Cash and cash equivalents	485,424,000	894,948,000
Notes receivable, net	28,630,000	20,554,000
Liabilities:
Fixed-rate debt	1,050,333,000	1,045,298,000
Variable-rate debt	962,916,000	509,737,000
Total mortgages, notes and loans payable	$ 2,013,249,000	$ 1,555,035,000