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Accounts Receivable (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Accounts Receivable |  |
Accounts receivable | $ 160,154 | $ 151,950
Oil, gas, and NGL production revenue [Member] |  |
Accounts Receivable |  |
Accounts receivable | 96,610 | 96,101
Amounts due from joint interest owners [Member] |  |
Accounts Receivable |  |
Accounts receivable | 56,929 | 29,669
State severance tax refunds [Member] |  |
Accounts Receivable |  |
Accounts receivable | 2,276 | 15,320
Derivative settlements [Member] |  |
Accounts Receivable |  |
Accounts receivable | 99 | 6,512
Other [Member] |  |
Accounts Receivable |  |
Accounts receivable | $ 4,240 | $ 4,348

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