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STOCK-BASED COMPENSATION PLANS - Narrative (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost $ 5,300,000 $ 4,600,000 $ 4,700,000
Total recognized tax benefit $ 2,000,000 $ 1,800,000 $ 1,900,000
Weighted average fair value of stock awards granted (USD per share) $ 35.84 $ 26.81 $ 26.66
Vesting period 5 years    
Total fair value of awards vested $ 4,400,000 $ 4,400,000 $ 3,400,000
Expected weighted-average period for recognition of unrecognized compensation 2 years    
Unrecognized stock-based compensation expense $ 6,500,000    
Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Total compensation cost 0 0 0
Total recognized tax benefit $ 0 0 0
Vesting period 5 years    
Contractual life 10 years    
Weighted average remaining contractual term for options outstanding 2 years    
Total intrinsic value $ 362,700 879,600 210,000
Unrecognized stock-based compensation expense $ 0 $ 0 $ 0
2013 Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under the plan (shares) 1,030,000.00    
Number of shares available for grant under the plan (shares) 383,000    
2013 Equity Compensation Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against the share limit for each stock granted (percent) 300.00%    
2013 Equity Compensation Plan | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against the share limit for each stock granted (percent) 100.00%    
2011 Equity Compensation Plan      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares authorized under the plan (shares) 1,400,000.0    
Number of shares available for grant under the plan (shares) 6,000    
2011 Equity Compensation Plan | Restricted Stock      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against the share limit for each stock granted (percent) 300.00%    
2011 Equity Compensation Plan | Employee Stock Option      
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Number of shares counted against the share limit for each stock granted (percent) 100.00%