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Supplemental Balance Sheet Information - Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Balance Sheet Related Disclosures [Abstract]    
Accrued interest $ 5,737 $ 10,761
Asset retirement obligations 0 25
Property and other taxes payable 4,623 5,411
Accrued payroll 3,945 3,011
Operating lease liabilities 7,645 7,722
Other 1,203 1,859
Total other accrued liabilities $ 23,153 $ 28,789