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LONG-TERM DEBT - Covenants (Details) - Senior Secured Notes Due 2024 - Senior Secured Notes
Mar. 31, 2019
USD ($)
Line of Credit Facility [Line Items]  
Cash and cash equivalents, allowed to deduct from adjusted EBITDA to debt ratio $ 15,000,000
June 30, 2019  
Line of Credit Facility [Line Items]  
Total leverage covenant ratio 5.00
December 31, 2019  
Line of Credit Facility [Line Items]  
Total leverage covenant ratio 4.75