EARNINGS PER SHARE - (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Shares
Basic (in shares)	18,218	18,056	18,186	17,997
Effect of dilutive stock options (in shares)	643	653	637	668
Diluted (in shares)	18,861	18,709	18,823	18,665
Per Share Amount
Basic (in dollars per share)	$ 0.59	$ 0.52	$ 0.46	$ 1.42
Effect of dilutive stock options (in dollars per share)	(0.02)	(0.02)	(0.02)	(0.05)
Diluted (in dollars per share)	$ 0.57	$ 0.50	$ 0.44	$ 1.37