EARNINGS PER SHARE ("EPS") - Computation of Basic and Diluted Earnings (Loss) Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Numerator:
Net income from continuing operations	$ (900)	$ (529)	$ 1,949	$ 622	$ 22,060	$ 72,391	$ 91,372	$ 193,935	$ 1,142	$ 379,758	$ 30,712
Net income attributable to noncontrolling interests									(21)	(21)	(18)
Redeemable preferred stock dividends accumulated									1,436	(1,436)	0
Redeemable preferred stock dividends declared									(16,859)	(490)	(9)
Redeemable preferred stock redemptions	$ 1	$ 1	$ 1	$ 1	$ 2	$ 0	$ 0	$ 0	4	2	0
Basic net (loss) income from continuing operations attributable to common stockholders									(14,298)	377,813	30,685
Redeemable preferred stock dividends declared on dilutive shares									0	9	0
Diluted net (loss) income from continuing operations attributable to common stockholders									(14,298)	377,822	30,685
Net income from discontinued operations									0	0	3,853
Basic net (loss) income attributable to common stockholders									(14,298)	377,813	34,538
Diluted net (loss) income attributable to common stockholders									$ (14,298)	$ 377,822	$ 34,538
Denominator:
Basic weighted average shares of common stock outstanding (in shares)									43,792	69,062	91,328
Effect of dilutive securities—contingently issuable shares (in shares)									0	8	0
Diluted weighted average shares and common stock equivalents outstanding (in shares)	43,795	43,795	43,791	43,785	55,917	57,876	78,871	84,048	43,792	69,070	91,328
Basic and diluted net (loss) income attributable to common stockholders per share:
Continuing operations (in usd per share)	$ (0.11)	$ (0.10)	$ (0.04)	$ (0.07)	$ 0.36	$ 1.25	$ 1.16	$ 2.31	$ (0.33)	$ 5.47	$ 0.34
Discontinued operations (in usd per share)									0.00	0.00	0.04
Net (loss) income (in usd per share)	$ (0.11)	$ (0.10)	$ (0.04)	$ (0.07)	$ 0.36	$ 1.25	$ 1.16	$ 2.31	$ (0.33)	$ 5.47	$ 0.38