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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Liabilities    
Capital expenditures $ 16,284 $ 27,427
Operating expenses 9,839 24,980
Interest expense 40,524 44,440
Other 5,637 7,341
Total accrued liabilities $ 72,284 $ 104,188