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Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Accounts Receivable |  |
Accounts receivable | $ 167,536 | $ 160,154
Oil, gas, and NGL production revenue [Member] |  |
Accounts Receivable |  |
Accounts receivable | 107,230 | 96,610
Amounts due from joint interest owners [Member] |  |
Accounts Receivable |  |
Accounts receivable | 31,497 | 56,929
State severance tax refunds [Member] |  |
Accounts Receivable |  |
Accounts receivable | 4,415 | 2,276
Derivative settlements [Member] |  |
Accounts Receivable |  |
Accounts receivable | 9,475 | 99
Other [Member] |  |
Accounts Receivable |  |
Accounts receivable | $ 14,919 | $ 4,240

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