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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
EARNINGS PER SHARE        
Net income $ 12,335 $ 9,150 $ 22,730 $ 18,958
Weighted average shares outstanding - basic 31,525,000 36,117,000 33,167,000 39,000,000
SHARE-BASED COMPENSATION        
Weighted average shares outstanding - diluted 31,953,000 36,656,000 33,588,000 39,405,000
Basic earnings per share (in dollars per share) $ 0.39 $ 0.25 $ 0.69 $ 0.49
Diluted earnings per share (in dollars per share) $ 0.39 $ 0.25 $ 0.68 $ 0.48
Antidilutive securities excluded from the dilutive share calculation (in shares) 12,996 22,864 12,996 22,864
Stock Option        
SHARE-BASED COMPENSATION        
Dilutive effect of share-based compensation arrangements 428,000 539,000 421,000 405,000