FAIR VALUE OF FINANCIAL INSTRUMENTS (Assets and Liabiliites Measured on a Nonrecurring Basis) (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Assets:
Cash and cash equivalents	$ 18	$ 75,027
Liabilities:
Allowance, notes receivable	200	500
Nonrecurring | Reported Value Measurement
Assets:
Cash and cash equivalents	445,283	485,424
Notes receivable, net	1,664	28,630
Liabilities:
Fixed-rate debt	1,141,381	1,030,554
Variable-rate debt	1,314,973	962,916
Nonrecurring | Estimate of Fair Value Measurement
Assets:
Cash and cash equivalents	445,283	485,424
Notes receivable, net	1,664	28,630
Liabilities:
Fixed-rate debt	1,137,166	1,050,333
Variable-rate debt	$ 1,314,973	$ 962,916