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LONG-TERM DEBT - Rolling Maturities of Long-Term Debt (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Debt Disclosure [Abstract]    
2020 $ 4,007  
2021 4,007  
2022 4,007  
2023 378,819  
2024 92,495  
Total Debt $ 483,335 $ 412,682