EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Basic, numerator:
Net income	$ 23,361	$ 1,902
Effect of unvested restricted stock unit awards		(1)
Adjusted net income	$ 23,361	$ 1,901
Basic, denominator:
Weighted-average shares	25,454,921	25,390,377
Earnings per common share (in dollars per share)	$ 0.92	$ 0.07
Diluted, numerator:
Net income	$ 23,361	$ 1,902
Effect of unvested restricted stock unit awards		(1)
Adjusted net income	$ 23,361	$ 1,901
Diluted, denominator:
Weighted-average shares	25,454,921	25,390,377
Effect of dilutive securities	1,475,481	856,423
Adjusted weighted-average shares and assumed conversions	26,930,402	26,246,800
Earnings per common share (in dollars per share)	$ 0.87	$ 0.07