EARNINGS PER SHARE (''EPS'') (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Numerator:
Net income (loss) attributable to common stockholders	$ 48,260	$ (1,876)	$ 335,891	$ (4,902)
Redeemable preferred stock dividends declared on dilutive shares	659	0	1,151	0
Diluted net income (loss) attributable to common stockholders	$ 48,919	$ (1,876)	$ 337,042	$ (4,902)
Denominator:
Basic weighted average shares outstanding (in shares)	43,791	43,791	43,793	43,788
Effect of dilutive securities—contingently issuable shares and stock options (in shares)	2,062	0	2,011	0
Diluted weighted average shares and common stock equivalents outstanding (in shares)	45,853	43,791	45,804	43,788
Net income (loss) attributable to common stockholders per share:
Basic (in usd per share)	$ 1.10	$ (0.04)	$ 7.67	$ (0.11)
Diluted (in usd per share)	$ 1.07	$ (0.04)	$ 7.36	$ (0.11)