EARNINGS PER SHARE - (Details) - $ / shares shares in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Shares
Basic (in shares)	18,595	18,181	18,538	18,169
Effect of dilutive stock options (in shares)	870		843
Diluted (in shares)	19,465	18,181	19,381	18,169
Per Share Amount
Basic (in dollars per share)	$ 0.98	$ (0.24)	$ 1.42	$ (0.13)
Effect of dilutive stock options (in dollars per share)	(0.05)		(0.06)
Diluted (in dollars per share)	$ 0.93	$ (0.24)	$ 1.36	$ (0.13)