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Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Accounts Receivable |  |
Accounts receivable | $ 162,455 | $ 184,732
Oil, gas, and NGL production revenue [Member] |  |
Accounts Receivable |  |
Accounts receivable | 108,928 | 146,308
Amounts due from joint interest owners [Member] |  |
Accounts Receivable |  |
Accounts receivable | 31,514 | 22,681
State severance tax refunds [Member] |  |
Accounts Receivable |  |
Accounts receivable | 2,301 | 4,069
Derivative settlements [Member] |  |
Accounts Receivable |  |
Accounts receivable | 16,348 | 6,868
Other [Member] |  |
Accounts Receivable |  |
Accounts receivable | $ 3,364 | $ 4,806

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