EARNINGS (LOSS) PER SHARE - Reconciliation of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Earnings Per Share [Abstract]
Net income (loss)	$ 6,219	$ 8,682	$ (72,669)	$ (11,078)
Weighted average shares outstanding:
Basic (in shares)	29,829	29,077	29,796	29,009
Dilutive effect of restricted stock units and warrants (in shares)	2	50	0	0
Diluted (in shares)	29,831	29,127	29,796	29,009
Earnings (loss) per share:
Basic (in usd per share)	$ 0.21	$ 0.30	$ (2.44)	$ (0.38)
Diluted (in usd per share)	$ 0.21	$ 0.30	$ (2.44)	$ (0.38)