QUARTERLY FINANCIAL INFORMATION (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020		Dec. 31, 2019		Dec. 31, 2018
Quarterly Financial Information Disclosure [Abstract]
Revenues	$ 17,829	$ 17,334	$ 16,510	$ 25,535	$ 26,641	$ 29,215	$ 36,856	$ 47,277	$ 77,208		$ 139,989		$ 197,470
Net loss	(4,388)	(5,330)	(4,041)	(1,256)	(1,525)	2,856	52,567	291,623	(15,015)		345,521		1,142
Net loss attributable to the Company	(4,390)	(5,323)	(4,043)	(1,260)	(1,538)	2,848	52,566	291,797	(15,016)		345,673		1,121
Net (loss) income attributable to common stockholders	$ (8,861)	$ (9,678)	$ (8,141)	$ (6,787)	$ (11,573)	$ (1,622)	$ 48,260	$ 287,631	$ (33,467)		$ 322,696		$ (14,298)
NET INCOME (LOSS) ATTRIBUTABLE TO COMMON STOCKHOLDERS PER SHARE
Basic (in usd per share)	$ (0.60)	$ (0.65)	$ (0.55)	$ (0.46)	$ (0.79)	$ (0.11)	$ 3.31	$ 19.70	$ (2.27)	[1]	$ 22.11	[1]	$ (0.98)	[1]
Diluted (in usd per share)	$ (0.60)	$ (0.65)	$ (0.55)	$ (0.46)	$ (0.79)	$ (0.11)	$ 3.20	$ 18.90	$ (2.27)	[1]	$ 19.74	[1]	$ (0.98)	[1]

[1] All share and per share amounts have been adjusted to give retroactive effect to the one-for-three reverse stock split of our common stock effected on September 3, 2019.