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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Basic, numerator:        
NET INCOME $ 19,154 $ 19,618 $ 39,866 $ 31,633
Effect of unvested restricted stock unit awards (175) (981) (418) (1,591)
Adjusted net income $ 18,979 $ 18,637 $ 39,448 $ 30,042
Basic, denominator:        
Weighted-average shares 26,009,344 26,054,678 26,033,467 25,979,555
Earnings per common share (in dollars per share) $ 0.73 $ 0.72 $ 1.52 $ 1.16
Diluted, numerator:        
NET INCOME $ 19,154 $ 19,618 $ 39,866 $ 31,633
Effect of unvested restricted stock unit awards (172) (981) (410) (1,591)
Adjusted net income $ 18,982 $ 18,637 $ 39,456 $ 30,042
Diluted, denominator:        
Weighted-average shares 26,009,344 26,054,678 26,033,467 25,979,555
Effect of dilutive securities 499,138   536,333 453
Adjusted weighted-average shares and assumed conversions 26,508,482 26,054,678 26,569,800 25,980,008
Earnings per common share (in dollars per share) $ 0.72 $ 0.72 $ 1.48 $ 1.16