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OTHER SUPPLEMENTAL INFORMATION - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Accrued payroll liabilities $ 2,536 $ 2,385
Accrued interest 160 181
Other accrued liabilities 2,816 3,468
Total accrued liabilities $ 5,512 $ 6,034