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LONG-TERM DEBT LIABILITIES - Senior Debt (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Nov. 17, 2017
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Apr. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Notes     $ 325,000     $ 0
Interest rate on notes     7.25%      
Repayments Of long term debt     $ 425,000 $ 10,018    
Aggregate notional amounts outstanding   $ 560,000        
Revolving Credit Facility            
Debt Instrument [Line Items]            
New Credit Facility, Amount Outstanding     89,000      
Term Loan B            
Debt Instrument [Line Items]            
Repayments Of long term debt     $ 425,000      
Senior secured second-lien notes due 2027 [Member]            
Debt Instrument [Line Items]            
Notes         $ 325,000  
Interest rate on notes     6.50%      
Senior secured second-lien notes due 2027 [Member] | Until May 1 2022 [Member]            
Debt Instrument [Line Items]            
Redemption rate as a percentage of principal amount     106.50%      
Senior secured second-lien notes due 2027 [Member] | On or after May 1 2022 [Member]            
Debt Instrument [Line Items]            
Redemption rate as a percentage of principal amount     104.875%      
Term B-1 loan [Member]            
Debt Instrument [Line Items]            
Write-off of unamortized deferred financing costs   1,600        
Deferred financing costs   $ 3,900        
Senior Debt Obligations            
Debt Instrument [Line Items]            
Consolidated Leverage Ratio     2.7      
Senior Debt Obligations | Maximum [Member]            
Debt Instrument [Line Items]            
Consolidated Leverage Ratio     4.0      
Senior Debt Obligations | One year period following consummation of permitted acquisition [Member] | Maximum [Member]            
Debt Instrument [Line Items]            
Consolidated Leverage Ratio     4.5      
Senior Debt Obligations | New Revolver [Member]            
Debt Instrument [Line Items]            
Undrawn amount of the Revolver     $ 110,100      
New Credit Facility, Amount Outstanding $ 250,000          
Senior Debt Obligations | New Term B Loan [Member]            
Debt Instrument [Line Items]            
Redemption rate as a percentage of principal amount 1.00%