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STOCK-BASED COMPENSATION - Benefit Plans, Activity and Expense Measurement and Recognition (Details)
 12 Months Ended
May. 21, 2014
item
Dec. 31, 2015
USD ($)
$ / shares
shares
Dec. 31, 2014
USD ($)
$ / shares
shares
Dec. 31, 2013
USD ($)
$ / shares
Option valuation assumptions for options granted        
Cash received for all stock option exercises | $   $ 3,900,000 $ (2,726,000) $ 3,438,000
Tax benefit realized from stock awards exercised | $   $ 865,000 $ 1,079,000 $ 413,000
Stock options        
STOCK-BASED COMPENSATION        
Number of stock option plans | item 2      
Number of common shares authorized to be purchased   1,000,000    
Options        
Outstanding at beginning of period (in shares)   2,002,203    
Granted (in shares)   492,957    
Exercised (in shares)   (389,905)    
Forfeited (in shares)   (66,668)    
Outstanding at end of period (in shares)   2,038,587 2,002,203  
Exercisable at end of period (in shares)   798,583    
Weighted-Average Exercise Price        
Outstanding at beginning of period (in dollars per share) | $ / shares   $ 13.73    
Granted (in dollars per share) | $ / shares   18.94    
Exercised (in dollars per share) | $ / shares   10.00    
Forfeited (in dollars per share) | $ / shares   14.81    
Outstanding at end of period (in dollars per share) | $ / shares   15.66 $ 13.73  
Exercisable at end of period (in dollars per share) | $ / shares   $ 14.08    
Weighted Average Remaining Contractual Term        
Outstanding at end of period   7 years 1 month 6 days    
Exercisable at end of period   4 years 9 months 18 days    
Aggregate Intrinsic Value        
Outstanding at end of period (in dollars) | $   $ 15,080,254    
Exercisable at end of period (in dollars) | $   $ 7,592,610    
Nonvested Shares        
Nonvested at the beginning of the period (in shares)   1,173,143    
Granted (in shares)   492,957    
Vested (in shares)   (359,428)    
Forfeited (in shares)   (66,668)    
Nonvested at the end of the period (in shares)   1,240,004 1,173,143  
Weighted-Average Grant Date Fair Value        
Nonvested at the beginning of the period (in dollars per share) | $ / shares   $ 3.91    
Granted (in dollars per share) | $ / shares   5.87    
Vested (in dollars per share) | $ / shares   2.90    
Forfeited (in dollars per share) | $ / shares   4.05    
Nonvested at the end of the period (in dollars per share) | $ / shares   $ 4.97 $ 3.91  
Unrecognized costs        
Unrecognized costs related to all share-based awards outstanding | $   $ 4,200,000    
Weighted average period for recognition of unrecognized compensation costs   2 years 7 months 6 days    
Option valuation assumptions for options granted        
Expected volatility (as a percent)   39.10% 34.95% 37.03%
Weighted average risk free rate (as a percent)   1.14% 1.06% 0.85%
Weighted average grant date fair value per share of options granted (in dollars per share) | $ / shares   $ 5.90 $ 4.02 $ 5.38
Total fair value of shares vested | $   $ 1,041,000 $ 913,000 $ 1,123,000
Total intrinsic value of options exercised | $   4,321,000 8,921,000 2,737,000
Cash received for all stock option exercises | $   3,900,000 12,595,000 3,438,000
Tax benefit realized from stock awards exercised | $   $ 1,512,000 $ 3,122,000 $ 958,000
Stock options | Maximum        
STOCK-BASED COMPENSATION        
Number of common shares authorized to be purchased   2,453,506    
Stock options | Directors' Plan        
Option valuation assumptions for options granted        
Expected life   3 years 11 months 19 days 3 years 7 months 2 days 3 years 3 months 26 days
Stock options | Executive Plan        
Option valuation assumptions for options granted        
Expected life   4 years 3 months 11 days 4 years 3 months 22 days 4 years 5 months 23 days
Stock options | Employee Plan        
Option valuation assumptions for options granted        
Expected life   3 years 11 months 19 days 3 years 7 months 2 days 3 years 3 months 26 days