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LONG-TERM DEBT (Details)
3 Months Ended 6 Months Ended
Apr. 03, 2018
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2017
USD ($)
Debt            
Term loans   $ 403,760,000   $ 403,760,000   $ 413,581,000
Less: Debt issuance costs, net   (4,317,000)   (4,317,000)   (3,158,000)
Less: Unamortized discount, net   (3,911,000)   (3,911,000)   (1,142,000)
Net long-term debt   395,532,000   395,532,000   409,281,000
Less: Current portion   (41,200,000)   (41,200,000)   (5,945,000)
Long-term debt, less current portion   354,332,000   354,332,000   403,336,000
Write-off of unamortized debt issuance costs and debt discount   4,434,000 $ 0 4,434,000 $ 0  
Repayment of long-term debt       421,821,000 24,766,000  
Debt issuance costs, net   4,317,000   4,317,000   3,158,000
Gain on early extinguishment of debt   0 3,937,000 0 3,937,000  
Term B loans            
Debt            
Less: Debt issuance costs, net   (4,300,000)   (4,300,000)    
Long-term debt, maturities, 2018   24,700,000   24,700,000    
Long-term debt, maturities, 2019   41,200,000   41,200,000    
Long-term debt, maturities, 2020   25,700,000   25,700,000    
Long-term debt, maturities, due annually thereafter   12,400,000   $ 12,400,000    
Repayment of long-term debt   8,200,000        
Leverage ratio to avoid mandatory prepayments under the Credit Agreement (maximum)       3.0    
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds)       3.50    
Mandatory prepayments owed   $ 0        
Interest rate at the end of the period (as a percent)   6.33%   6.33%    
Debt issuance costs, net   $ 4,300,000   $ 4,300,000    
Accumulated amortization   200,000   200,000    
Extinguishment of debt, amount   $ 0   $ 0    
Weighted average discount of par received on early extinguishment of debt   0.00%   0.00%    
Term B loans | Maximum            
Debt            
Amount of principal or interest if failed to pay considered as event of default       $ 40,000,000.000    
Amount of debt which results in acceleration of debt if failed to pay considered as event of default       40,000,000.000    
Amount of unbonded, undischarged or unstayed debt under entry by court of one or more judgments for certain period to determine as event of default       $ 40,000,000.000    
Line of Credit | Domestic Line of Credit            
Debt            
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds)       3.5    
Line of Credit | Revolving Credit Facility | Domestic Line of Credit            
Debt            
Term loans   $ 0   $ 0    
Unused commitment fee (as a percent)       0.50%    
Senior secured term loan            
Debt            
Term loans $ 412,100,000          
Less: Debt issuance costs, net           (3,200,000)
Write-off of unamortized debt issuance costs and debt discount   $ 4,400,000        
Debt issuance costs, net           3,200,000
Accumulated amortization           $ 7,100,000
Extinguishment of debt, amount     $ 26,000,000   $ 0  
Weighted average discount of par received on early extinguishment of debt     16.50%   0.00%  
Gain on early extinguishment of debt     $ 3,900,000      
April 3, 2018 Credit Agreement            
Debt            
Debt instrument accordion feature, potential increase in additional borrowings $ 125,000,000          
April 3, 2018 Credit Agreement | Domestic Line of Credit | Adjusted Eurodollar Rate            
Debt            
Reference rate Adjusted Eurodollar Rate          
April 3, 2018 Credit Agreement | Domestic Line of Credit | Base Rate            
Debt            
Reference rate Base Rate          
April 3, 2018 Credit Agreement | Term B loans            
Debt            
Debt instrument, face amount $ 412,000,000          
April 3, 2018 Credit Agreement | Term B loans | Adjusted Eurodollar Rate            
Debt            
Reference rate Adjusted Eurodollar Rate          
Debt instrument fixed base rate 1.00%          
Interest rate margin (as a percent) 4.00%          
April 3, 2018 Credit Agreement | Term B loans | Base Rate            
Debt            
Reference rate Base Rate          
Debt instrument fixed base rate 2.00%          
Interest rate margin (as a percent) 3.00%          
April 3, 2018 Credit Agreement | Line of Credit | Revolving Credit Facility | Domestic Line of Credit            
Debt            
Debt instrument, face amount $ 15,000,000          
Debt instrument accordion feature, potential increase in additional borrowings $ 80,000,000          
April 3, 2018 Credit Agreement | Line of Credit | Revolving Credit Facility | Domestic Line of Credit | Adjusted Eurodollar Rate            
Debt            
Interest rate margin (as a percent) 4.00%          
April 3, 2018 Credit Agreement | Line of Credit | Revolving Credit Facility | Domestic Line of Credit | Base Rate            
Debt            
Interest rate margin (as a percent) 3.00%