Quarterly report pursuant to Section 13 or 15(d)

LONG-TERM DEBT AND CAPITAL LEASE OBLIGATION - Covenants (Details)

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LONG-TERM DEBT AND CAPITAL LEASE OBLIGATION - Covenants (Details) - Senior Secured Notes Due 2024 - Senior Secured Notes
Sep. 30, 2018
USD ($)
Line of Credit Facility [Line Items]  
Cash and cash equivalents, allowed to deduct from adjusted EBITDA to debt ratio $ 15,000,000
September 30, 2018  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 5.50
December 31, 2018  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 5.25
March 31, 2019  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 5.00
June 30, 2019  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 5.00
September 30, 2019  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.75
December 31, 2019  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.75
March 31, 2020  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.50
June 30, 2020  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.50
September 30, 2020  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.25
December 31, 2020  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.25
March 31, 2021  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.25
June 30, 2021  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.25
September 30, 2021 and the last day of each fiscal quarter thereafter  
Line of Credit Facility [Line Items]  
Maximum Total Leverage Ratio 4.00