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OTHER SUPPLEMENTAL INFORMATION - Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Organization Consolidation And Presentation Of Financial Statements [Abstract]    
Accrued payroll liabilities $ 2,232 $ 2,781
Accrued interest 235 1,877
Other accrued liabilities 4,424 1,653
Total accrued liabilities $ 6,891 $ 6,311