Quarterly report pursuant to Section 13 or 15(d)

Note 1 - Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details)

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Note 1 - Basis of Presentation - Schedule of Other Liabilities (Long-term) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Dispute related to royalty deductions $ 4,687 $ 4,687
Dispute related to royalty-in-kind 2,231 2,135
Apache lawsuit (Note 12) 49,500
Uncertain tax positions including interest/penalties 11,523
Lease liability (Note 8) 7,883
Other liabilities, long-term 1,466 845
Total other liabilities (long-term) $ 16,267 $ 68,690