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EARNINGS PER SHARE (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
SHARE-BASED COMPENSATION        
Net income $ 12,137 $ 12,335 $ 23,318 $ 22,730
Weighted average shares outstanding - basic 31,060,593 31,525,075 31,162,013 33,166,987
Weighted average shares outstanding - diluted 31,262,525 31,953,022 31,359,568 33,588,233
Basic earnings per common share (in dollars per share) $ 0.39 $ 0.39 $ 0.75 $ 0.69
Diluted earnings per common share (in dollars per share) $ 0.39 $ 0.39 $ 0.74 $ 0.68
Antidilutive securities excluded from the dilutive share calculation (in shares) 8,227 12,996 9,439 12,996
Stock Option        
SHARE-BASED COMPENSATION        
Dilutive effect of share-based compensation arrangements 201,932 427,947 197,555 421,246