EARNINGS (LOSS) PER SHARE - Summary (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income (loss)	$ 5,780	$ (5,857)	$ 10,874	$ (62,278)
Basic weighted-average common shares outstanding (in shares)	17,575	17,372	17,560	17,354
Effect of dilutive options and restricted stock awards (in shares)	402	0	363	0
Diluted weighted-average common shares outstanding (in shares)	17,977	17,372	17,923	17,354
Earnings (loss) per share:
Basic (in usd per share)	$ 0.33	$ (0.34)	$ 0.62	$ (3.59)
Diluted (in usd per share)	$ 0.32	$ (0.34)	$ 0.61	$ (3.59)