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STOCK-BASED COMPENSATION (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 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 $ 51 $ 79 $ 3,196 $ 3,787
Restricted Stock Awards        
Summary of Stock-Based Compensation Plans        
Compensation expense related to restricted stock awards $ 3,698 $ 3,565 $ 7,652 $ 6,745
Restricted Stock Awards | Minimum        
Summary of Stock-Based Compensation Plans        
Vesting period     3 years  
Restricted Stock Awards | Maximum        
Summary of Stock-Based Compensation Plans        
Vesting period     5 years