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LONG-TERM DEBT - Future Minimum Principal Payments (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
LONG-TERM DEBT    
July - December 2021 $ 0  
2022 0  
2023 0  
2024 0  
2025 0  
2026 and thereafter 832,505  
Total Debt 832,505 $ 855,156
7.375% Senior Secured Notes due February 2028    
LONG-TERM DEBT    
July - December 2021 0  
2022 0  
2023 0  
2024 0  
2025 0  
2026 and thereafter 825,000  
Total Debt 825,000 0
PPP loan    
LONG-TERM DEBT    
July - December 2021 0  
2022 0  
2023 0  
2024 0  
2025 0  
2026 and thereafter 7,505  
Total Debt $ 7,505 $ 0