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EARNINGS PER SHARE - Calculation of Basic and Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Earnings Per Share [Abstract]
Net income	$ 10,207	$ 5,068
Weighted average shares outstanding - basic (in shares)	10,975	10,959
Dilutive effect of share-based compensation (in shares)	99	103
Weighted average shares outstanding - diluted (in shares)	11,074	11,062
Per share information:
Basic earnings per share (in usd per share)	$ 0.93	$ 0.46
Diluted earnings per share (in usd per share)	$ 0.92	$ 0.46

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