EARNINGS PER SHARE - (Information Related to EPS Calculation) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Numerator:
Net income	$ 147,328	$ 10,516	$ 3,120	$ 5,659	$ 43,595	$ 7,996	$ 6,970	$ 143,765	$ 166,623	$ 202,326	$ 126,719
Net loss (income) attributable to noncontrolling interests									1,781	(23)
Net income attributable to common stockholders	$ 149,121	$ 10,504	$ 3,120	$ 5,659	$ 43,595	$ 7,973	$ 6,970	$ 143,765	$ 168,404	$ 202,303	$ 126,719
Denominator:
Weighted average basic common shares outstanding	42,860,000	42,845,000	40,373,000	39,799,000	39,502,000	39,502,000	39,492,000	39,473,000	41,364	39,492	39,470
Numerator:
Net income attributable to common stockholders	$ 149,121	$ 10,504	$ 3,120	$ 5,659	$ 43,595	$ 7,973	$ 6,970	$ 143,765	$ 168,404	$ 202,303	$ 126,719
Less: Warrant liability gain											(58,320)
Adjusted net income attributable to common stockholders									$ 168,404	$ 202,303	$ 68,399
Denominator:
Weighted average basic common shares outstanding	42,860,000	42,845,000	40,373,000	39,799,000	39,502,000	39,502,000	39,492,000	39,473,000	41,364	39,492	39,470
Restricted stock and stock options (in shares)									279	343	411
Warrants (in shares)									1,446	2,894	2,873
Weighted average diluted common shares outstanding	43,120,000	43,267,000	43,051,000	42,757,000	42,753,000	42,760,000	42,664,000	42,400,000	43,089	42,729	42,754
Basic income per share: (in dollars per share)	$ 3.48	$ 0.25	$ 0.08	$ 0.14	$ 1.10	$ 0.20	$ 0.18	$ 3.64	$ 4.07	$ 5.12	$ 3.21
Diluted income per share: (in dollars per share)	$ 3.46	$ 0.24	$ 0.07	$ 0.13	$ 1.02	$ 0.19	$ 0.16	$ 2.69	$ 3.91	$ 4.73	$ 1.60