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STOCK COMPENSATION PLANS (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Total Stock Compensation Expense and Related Net Tax Benefit [Abstract]        
Stock compensation costs $ 4,763 $ 4,050 $ 13,973 $ 11,702
Net tax benefit recognized in equity for stock compensation plans $ 14 $ 31 $ 1,019 $ 3,227
Restricted stock units | Ratably        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Restricted stock units | Minimum | Cliff        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     3 years  
Restricted stock units | Maximum | Cliff        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting period (in years)     5 years