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EARNINGS PER SHARE - (Details) - $ / shares shares in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Shares
Basic (in shares)	18,481	18,158
Effect of dilutive stock options (in shares)	802	716
Diluted (in shares)	19,283	18,874
Per Share Amount
Basic (in dollars per share)	$ 0.44	$ 0.11
Effect of dilutive stock options (in dollars per share)	(0.02)
Diluted (in dollars per share)	$ 0.42	$ 0.11

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