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DEBT (Details)
$ in Thousands
3 Months Ended
Jun. 17, 2014
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Jun. 16, 2014
USD ($)
Long-term debt        
Term loan   $ 290,230 $ 300,994  
Unamortized discount and debt issuance costs   (6,724) (7,254)  
Total debt   283,506 293,740  
Current portion of long-term debt   (2,954) (3,056)  
Long-term debt   $ 280,552 $ 290,684  
Credit Agreement        
Long-term debt        
Mandatory prepayments as a percentage of adjusted excess cash flow if entity's total leverage ratio is greater than the specified leverage ratio 50.00%      
Total leverage ratio 2.50      
Mandatory prepayments as a percentage of adjusted excess cash flow if entity's total leverage ratio is equal to or less than the specified leverage ratio 0.00%      
Credit Agreement | EQ        
Long-term debt        
Maximum borrowing capacity $ 540,000      
Term Loan        
Long-term debt        
Debt instrument, aggregate annual amortization as a percentage of original principal amount 1.00%      
Effective interest rate (as a percent)   4.72%    
Percentage of principal amount of debt instrument for which the Company is required to enter into one or more interest rate hedge agreements   78.00%    
Amount of debt hedged   $ 225,000    
Term Loan | Minimum        
Long-term debt        
Percentage of principal amount of debt instrument for which the Company is required to enter into one or more interest rate hedge agreements 50.00%      
Term Loan | Base rate        
Long-term debt        
Percentage points added to the reference rate 2.00%      
Term Loan | LIBOR        
Long-term debt        
Percentage points added to the reference rate 3.00%      
Term Loan | EQ        
Long-term debt        
Maximum borrowing capacity $ 415,000      
Percentage of outstanding shares acquired 100.00%      
Revolving Line of Credit        
Long-term debt        
Maximum borrowing capacity $ 125,000      
Amount outstanding   0   $ 0
Early termination penalties incurred $ 0      
Commitment fee (as a percent) 0.50%      
Availability for borrowings under line of credit   117,300    
Line of credit issued in the form of a standby letters of credit   $ 7,700    
Revolving Line of Credit | December 31, 2015 through September 30, 2016        
Long-term debt        
Maximum consolidated senior secured leverage ratio   3.75    
Revolving Line of Credit | December 31, 2016 through September 30, 2017        
Long-term debt        
Maximum consolidated senior secured leverage ratio   3.50    
Revolving Line of Credit | December 31, 2017 through September 30, 2018        
Long-term debt        
Maximum consolidated senior secured leverage ratio   3.25    
Revolving Line of Credit | December 31, 2018 and thereafter        
Long-term debt        
Maximum consolidated senior secured leverage ratio   3.00    
Letter of credit        
Long-term debt        
Maximum borrowing capacity $ 50,000