Quarterly report pursuant to Section 13 or 15(d)

Accrued Liabilities and Other - Summary (Details)

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Accrued Liabilities and Other - Summary (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Payables and Accruals [Abstract]    
Accrued payroll $ 3,314 $ 2,352
Royalties payable 11,834 3,903
Accrued lease operating expense 5,232 2,230
Contingent liability - White Wolf Acquisition 0 4,005
Preferred Stock dividends payable 3,328 937
Accrued interest expense 2,648 639
Other 5,397 1,426
Total accrued liabilities and other $ 31,753 $ 15,492