Quarterly report pursuant to Section 13 or 15(d)

Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details)

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Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Other Liabilities Disclosure [Abstract]    
Apache lawsuit $ 49,500 $ 49,500
Uncertain tax positions including interest/penalties 11,694 11,523
Dispute related to royalty deductions 4,687 4,687
Dispute related to royalty-in-kind 2,164 2,135
Other 5,097 845
Total other liabilities (long-term) $ 73,142 $ 68,690