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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		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Earnings Per Share [Abstract]
Net income	$ 8,776	$ 6,359	$ 18,983	$ 11,427
Weighted average shares outstanding - basic (in shares)	10,975	10,916	10,975	10,937
Dilutive effect of share-based compensation (in shares)	137	77	118	90
Weighted average shares outstanding - diluted (in shares)	11,112	10,993	11,093	11,027
Per share information:
Basic earnings per share (in usd per share)	$ 0.80	$ 0.58	$ 1.73	$ 1.04
Diluted earnings per share (in usd per share)	$ 0.79	$ 0.58	$ 1.71	$ 1.04

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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