EARNINGS PER SHARE - Basic and Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Basic, numerator:
Net income	$ 213,521	$ 71,100	$ 39,985
Effect of unvested restricted stock awards			(22)
Adjusted net income	$ 213,521	$ 71,100	$ 39,963
Basic, denominator:
Weighted-average shares	25,471,939	25,410,232	25,535,529
Earnings per common share (in dollars per share)	$ 8.38	$ 2.80	$ 1.56
Diluted, numerator:
Net income	$ 213,521	$ 71,100	$ 39,985
Effect of unvested restricted stock awards			(21)
Adjusted net income	$ 213,521	$ 71,100	$ 39,964
Diluted, denominator:
Weighted-average shares	25,471,939	25,410,232	25,535,529
Effect of dilutive securities	1,300,187	1,012,291	914,526
Adjusted weighted-average shares and assumed conversions	26,772,126	26,422,523	26,450,055
Earnings per common share (in dollars per share)	$ 7.98	$ 2.69	$ 1.51