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EARNINGS PER SHARE - Schedule of EPS Calculation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 27,170	$ 26,349	$ 85,990	$ 52,392
Weighted average shares:
Basic weighted average number of shares outstanding (in shares)	20,613,290	22,665,069	21,099,059	23,226,109
Dilutive effect of outstanding common stock equivalents (in shares)	206,311	212,157	253,656	177,620
Diluted weighted-average number of shares outstanding (in shares)	20,819,601	22,877,226	21,352,715	23,403,729
Net income per share:
Basic earnings per share (in dollars per share)	$ 1.32	$ 1.16	$ 4.08	$ 2.26
Diluted earnings per share (in dollars per share)	$ 1.31	$ 1.15	$ 4.03	$ 2.24

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