Note 1 - Basis of Presentation (Tables)
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6 Months Ended |
Jun. 30, 2019 |
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| Notes Tables |
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| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
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| | | Derivative assets (1) | | $ | 22,089 | | | $ | 60,687 | | | Deposit for acquisition | | | 10,000 | | | | — | | | Unamortized bond/insurance premiums | | | 7,108 | | | | 5,197 | | | Prepaid deposits related to royalties | | | 8,824 | | | | 8,872 | | | Other | | | 5,080 | | | | 1,650 | | | Prepaid expenses and other assets | | $ | 53,101 | | | $ | 76,406 | | |
| Property, Plant and Equipment [Table Text Block] |
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| | | Oil and natural gas properties and equipment | | $ | 8,241,499 | | | $ | 8,169,871 | | | Furniture, fixtures and other | | | 20,228 | | | | 20,228 | | | Total property and equipment | | | 8,261,727 | | | | 8,190,099 | | | Less accumulated depreciation, depletion and amortization | | | 7,737,215 | | | | 7,674,678 | | | Oil and natural gas properties and other, net | | $ | 524,512 | | | $ | 515,421 | | |
| Schedule of Other Assets, Noncurrent [Table Text Block] |
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| | | Escrow deposit - Apache lawsuit | | $ | 49,500 | | | $ | 49,500 | | | Derivative assets | | | — | | | | 21,275 | | | Appeal bond deposits | | | 6,925 | | | | 6,925 | | | Unamortized debt issuance costs | | | 4,478 | | | | 4,773 | | | Investment in White Cap, LLC | | | 2,633 | | | | 2,586 | | | Unamortized brokerage fee for Monza | | | 3,268 | | | | 2,277 | | | Proportional consolidation of Monza's other assets (Note 4) | | | 2,251 | | | | 3,275 | | | Other | | | 4,522 | | | | 936 | | | Total other assets (long-term) | | $ | 73,577 | | | $ | 91,547 | | |
| Schedule of Accrued Liabilities [Table Text Block] |
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| | | Accrued interest | | $ | 10,179 | | | $ | 12,385 | | | Accrued salaries/payroll taxes/benefits | | | 2,627 | | | | 2,320 | | | Incentive compensation plans | | | 1,514 | | | | 10,817 | | | Litigation accruals | | | 3,673 | | | | 3,673 | | | Other | | | 1,501 | | | | 416 | | | Total accrued liabilities | | $ | 19,494 | | | $ | 29,611 | | |
| Other Noncurrent Liabilities [Table Text Block] |
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| | | Apache lawsuit | | $ | 49,500 | | | $ | 49,500 | | | Uncertain tax positions including interest/penalties | | | — | | | | 11,523 | | | Dispute related to royalty deductions | | | 4,687 | | | | 4,687 | | | Dispute related to royalty-in-kind | | | 2,197 | | | | 2,135 | | | Other | | | 5,001 | | | | 845 | | | Total other liabilities (long-term) | | $ | 61,385 | | | $ | 68,690 | | |