QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
QUARTERLY FINANCIAL INFORMATION (UNAUDITED)
Total revenues	$ 278,546	$ 242,265	$ 273,514	$ 240,680	$ 229,393	$ 203,442	$ 209,163	$ 155,090	$ 1,035,005	$ 797,088	$ 634,565
Operating income	59,372	784	73,636	192,970	40,191	36,544	25,572	16,457	326,762	118,764	166,722
Net income (loss)	43,595	7,996	6,970	143,765	25,881	156,212	50,585	(105,959)	202,326	126,719	(23,520)
Net income (loss) attributable to common stockholders	43,595	$ 7,973	$ 6,970	$ 143,765	$ 25,881	$ 156,224	$ 50,573	$ (105,959)	202,303	126,719	(23,531)
Equity in earnings from Real Estate and Other Affiliates	$ 3,200								$ 56,818	$ 3,721	$ 23,336
EARNINGS PER SHARE
Basic earnings (loss) per share: (in dollars per share)	$ 1.10	$ 0.20	$ 0.18	$ 3.64	$ 0.65	$ 3.96	$ 1.28	$ (2.68)	$ 5.12	$ 3.21	$ (0.60)
Diluted earnings (loss) per share: (in dollars per share)	$ 1.02	$ 0.19	$ 0.16	$ 2.69	$ 0.59	$ 0.76	$ 0.18	$ (2.68)	$ 4.73	$ 1.60	$ (0.60)
Weighted average shares outstanding:
Basic (in shares)	39,502	39,502	39,492	39,473	39,473	39,473	39,468	39,465	39,492	39,470	39,464
Diluted (in shares)	42,753	42,760	42,664	42,400	42,743	42,913	43,197	39,465	42,729	42,754	39,464