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STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Summary of Stock-Based Compensation Plans        
Stock options issued (in shares) 0 0 0 0
Net tax benefit recognized in equity for stock compensation plans $ 31 $ 129 $ 3,227 $ 3,916
Restricted Stock Awards        
Summary of Stock-Based Compensation Plans        
Compensation expense related to restricted stock awards $ 4,050 $ 3,637 $ 11,702 $ 10,382
Restricted Stock Awards | Ratably        
Summary of Stock-Based Compensation Plans        
Vesting period     3 years  
Restricted Stock Awards | Cliff | Minimum        
Summary of Stock-Based Compensation Plans        
Vesting period     3 years  
Restricted Stock Awards | Cliff | Maximum        
Summary of Stock-Based Compensation Plans        
Vesting period     5 years  
Restricted Stock Awards | Fourth year of employment | Minimum        
Summary of Stock-Based Compensation Plans        
Vesting rights (percent)     50.00%  
Restricted Stock Awards | Fifth year of employment | Minimum        
Summary of Stock-Based Compensation Plans        
Vesting rights (percent)     50.00%