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Accrued Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Accrued Liabilities    
Capital expenditures $ 47,026 $ 105,706
Gathering, compression, processing, and transportation expenses 159,828 134,153
Marketing expenses 48,122 52,612
Interest expense, net 26,795 30,834
Other 57,617 77,545
Total accrued liabilities $ 339,388 $ 400,850