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DEBT (Details)
$ in Thousands
9 Months Ended
Jun. 17, 2014
USD ($)
Sep. 30, 2016
USD ($)
Dec. 31, 2015
USD ($)
Long-term debt      
Term loan   $ 283,765 $ 300,994
Unamortized discount and debt issuance costs   (5,993) (7,254)
Total debt   277,772 293,740
Current portion of long-term debt   (2,903) (3,056)
Long-term debt   $ 274,869 $ 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)   4.75%  
Percentage of principal amount of debt instrument for which the Company is required to enter into one or more interest rate hedge agreements   76.00%  
Amount of debt hedged   $ 215,000  
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   $ 2,300  
Interest rate (as a percent)   5.25%  
Commitment fee (as a percent) 0.50%    
Availability for borrowings under line of credit   $ 115,200  
Line of credit issued in the form of a standby letters of credit   $ 7,500  
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  
Revolving Line of Credit | EQ      
Long-term debt      
Maximum borrowing capacity $ 125,000    
Letter of credit      
Long-term debt      
Maximum borrowing capacity 50,000    
Former Agreement      
Long-term debt      
Amount outstanding 0    
Early termination penalties incurred $ 0