EARNINGS PER SHARE (Details) - $ / shares shares in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Shares
Basic (in shares)	17,616	17,338	17,541	17,270
Effect of dilutive stock options (in shares)	782	382	671	333
Diluted (in shares)	18,398	17,720	18,212	17,603
Per Share Amount
Basic (in dollars per share)	$ 0.51	$ 0.45	$ 1.20	$ 1.05
Effect of dilutive stock options (in dollars per share)	(0.02)		(0.04)	(0.02)
Diluted (in dollars per share)	$ 0.49	$ 0.45	$ 1.16	$ 1.03
Stock options
Anti-dilutive securities
Anti-dilutive securities excluded from the computation of diluted earnings per share (in shares)	150	314	229	885