EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Basic
Net income, basic	$ 10,114	$ 9,904	$ 26,569	$ 17,907
Weighted average basic shares outstanding	21,714	21,655	21,700	21,619
Earnings per share (in dollars per share)	$ 0.47	$ 0.46	$ 1.22	$ 0.83
Diluted
Net income, diluted	$ 10,114	$ 9,904	$ 26,569	$ 17,907
Weighted average basic shares outstanding	21,714	21,655	21,700	21,619
Dilutive effect of stock-based awards (in shares)	90	94	80	104
Weighted average diluted shares outstanding	21,804	21,749	21,780	21,723
Earnings per share (in dollars per share)	$ 0.46	$ 0.46	$ 1.22	$ 0.82
Anti-dilutive shares excluded from calculation	195	181	267	192