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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
SHARE-BASED COMPENSATION        
Net income $ 12,206 $ 8,230 $ 34,936 $ 27,188
Weighted average shares outstanding - basic 31,331,000 35,863,000 32,548,000 37,943,000
Weighted average shares outstanding - diluted 31,750,000 36,353,000 32,932,000 38,440,000
Basic earnings per share (in dollars per share) $ 0.39 $ 0.23 $ 1.07 $ 0.72
Diluted earnings per share (in dollars per share) $ 0.38 $ 0.23 $ 1.06 $ 0.71
Antidilutive securities excluded from the dilutive share calculation (in shares) 12,532 13,864 12,532 13,864
Stock Option        
SHARE-BASED COMPENSATION        
Dilutive effect of share-based compensation arrangements 419,000 490,000 384,000 497,000