EARNINGS PER SHARE (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
EARNINGS PER SHARE
Net Income (Loss) Available to Common Stockholders, Basic	$ 10,047	$ 6,781	$ 25,614	$ 19,651
Basic:
Weighted average shares outstanding (shares in thousands)	22,063	21,871	22,062	22,067
Weighted average earnings per share basic	$ 0.46	$ 0.31	$ 1.16	$ 0.89
Diluted:
Effect of dilutive securities-stock options	75	122	82	138
Adjusted weighted average shares outstanding (shares in thousands)	22,138	21,993	22,144	22,205
Adjusted weighted average shares outstanding (in dollar per share)	$ 0.45	$ 0.31	$ 1.16	$ 0.88