Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details)

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Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details) - USD ($)
$ in Thousands
Jun. 30, 2021
Dec. 31, 2020
Total other liabilities (long-term) $ 56,259 $ 32,938
Other liabilities (long-term)    
Dispute related to royalty deductions 5,247 5,467
Derivatives 28,122 4,384
Lease liability 11,062 11,360
Black Elk escrow 11,102 11,103
Other $ 726 $ 624