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LONG-TERM DEBT (Details)
3 Months Ended
Apr. 03, 2018
USD ($)
Mar. 31, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]        
Less: Debt issuance costs, net   $ (3,685,000)   $ (3,855,000)
Less: Unamortized discount, net   (3,338,000)   (3,491,000)
Net long-term debt   331,799,000   331,476,000
Less: Current portion   (9,222,000)   0
Long-term debt, less current portion   322,577,000   331,476,000
Current portion of long-term debt   9,222,000   0
Aggregate amount of each consecutive quarterly scheduled principal installment   3,100,000    
Debt issuance costs, net   3,685,000   3,855,000
Accumulated amortization   $ 900,000   700,000
Term B loans        
Debt Instrument [Line Items]        
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      
Interest rate at the end of the period (as a percent)   6.60%    
Term B loans | Minimum        
Debt Instrument [Line Items]        
Leverage ratio to avoid mandatory prepayments under the Credit Agreement (maximum) 1.00      
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds) 1.00      
Term B loans | Maximum        
Debt Instrument [Line Items]        
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 | Revolving Credit Facility        
Debt Instrument [Line Items]        
Leverage ratio at which mandatory prepayments increase under the Credit Agreement (exceeds) 3.5      
Prior senior secured term loan        
Debt Instrument [Line Items]        
Senior secured term loans $ 412,100,000 $ 338,822,000   $ 338,822,000
Write-off of unamortized debt issuance costs and debt discount     $ 4,400,000  
April 3, 2018 Credit Agreement        
Debt Instrument [Line Items]        
Debt instrument accordion feature, potential increase in additional borrowings 125,000,000      
April 3, 2018 Credit Agreement | Term B loans        
Debt Instrument [Line Items]        
Debt instrument, face amount $ 412,000,000      
April 3, 2018 Credit Agreement | Term B loans | Adjusted Eurodollar Rate        
Debt Instrument [Line Items]        
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 Instrument [Line Items]        
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        
Debt Instrument [Line Items]        
Senior secured term loans   $ 0    
Debt instrument, face amount $ 15,000,000      
Debt instrument accordion feature, potential increase in additional borrowings $ 80,000,000      
Unused commitment fee (as a percent) 0.50%      
April 3, 2018 Credit Agreement | Line of Credit | Revolving Credit Facility | Adjusted Eurodollar Rate        
Debt Instrument [Line Items]        
Interest rate margin (as a percent) 4.00%      
April 3, 2018 Credit Agreement | Line of Credit | Revolving Credit Facility | Base Rate        
Debt Instrument [Line Items]        
Interest rate margin (as a percent) 3.00%