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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Numerator:            
Net income $ 13,766 $ 18,226 $ 11,300 $ 13,117 $ 43,292 $ 34,134
Denominator:            
Denominator for basic earnings per share 26,716     26,802 26,745 26,754
Dilutive effect of employee stock awards 186     97 138 132
Denominator for diluted earnings per share 26,902     26,899 26,883 26,886
Earnings per share:            
Basic $ 0.52     $ 0.49 $ 1.62 $ 1.28
Diluted $ 0.51     $ 0.49 $ 1.61 $ 1.27
Additional Disclosure            
Employee stock awards excluded from computation of diluted earnings per share 0     0 0 0