Quarterly report pursuant to Section 13 or 15(d)

Accounts Receivable and Revenues from Contracts with Customers - Summary of Accounts Receivable (Details)

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Accounts Receivable and Revenues from Contracts with Customers - Summary of Accounts Receivable (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Customers $ 64,965 $ 39,106
Joint interest partners 8,789 32,493
Other 532 584
Accounts Receivable, Gross, Current, Total 74,286 72,183
Less: Allowance for doubtful accounts (2,241) (2,362)
Accounts receivable, net of allowance for doubtful accounts $ 72,045 $ 69,821