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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accrued Liabilities    
Capital expenditures $ 22,289 $ 27,427
Operating expenses 15,557 24,980
Interest expense 13,370 44,440
Other 5,923 7,341
Total accrued liabilities $ 57,139 $ 104,188