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Supplemental Balance Sheet Information - Other Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Mar. 31, 2019
Balance Sheet Related Disclosures [Abstract]      
Accrued interest $ 3,538 $ 10,761  
Asset retirement obligations 0 25  
Property and other taxes payable 2,803 5,411  
Accrued payroll 3,944 3,011  
Operating lease liabilities 8,358 7,722 $ 7,722
Other 1,639 1,859  
Total other accrued liabilities $ 20,282 $ 28,789