SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES (Fair Value)(Details) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Fair Value of Financial Instruments
Fixed-rate debt	$ 1,255,373	$ 1,138,158
Variable-rate debt		568,695
Total Mortgages, notes and loans payable	1,735,926	1,694,841
Estimated Fair Value
Fair Value of Financial Instruments
Fixed-rate debt	1,290,722	1,156,729
Variable-rate debt	496,207	571,390
Total Mortgages, notes and loans payable	1,786,929	1,728,119
Carrying Amount
Fair Value of Financial Instruments
Fixed-rate debt	1,254,613	1,137,818
Variable-rate debt	493,500	568,695
Total Mortgages, notes and loans payable	$ 1,748,113	$ 1,706,513