Note 1 - Basis of Presentation (Tables)
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3 Months Ended |
Mar. 31, 2020 |
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| Notes Tables |
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| Accounts Receivable, Allowance for Credit Loss [Table Text Block] |
| Allowance for credit losses, December 31, 2019 | | $ | 9,898 | | | Additional provisions | | | 36 | | | Uncollectible accounts written off | | | — | | | Allowance for credit losses, March 31, 2020 | | $ | 9,934 | | |
| Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block] |
| | | | | | | | | Derivatives - current (1) | | $ | 64,039 | | | $ | 7,266 | | | Unamortized bond/insurance premiums | | | 4,478 | | | | 4,357 | | | Prepaid deposits related to royalties | | | 7,555 | | | | 7,980 | | | Prepayment to vendors | | | 1,825 | | | | 10,202 | | | Other | | | 761 | | | | 886 | | | Prepaid expenses and other assets | | $ | 78,658 | | | $ | 30,691 | | |
| Property, Plant and Equipment [Table Text Block] |
| | | | | | | | | Oil and natural gas properties and equipment, at cost | | $ | 8,546,778 | | | $ | 8,532,196 | | | Furniture, fixtures and other | | | 20,387 | | | | 20,317 | | | Total property and equipment | | | 8,567,165 | | | | 8,552,513 | | | Less: Accumulated depreciation, depletion and amortization | | | 7,837,121 | | | | 7,803,715 | | | Oil and natural gas properties and other, net | | $ | 730,044 | | | $ | 748,798 | | |
| Schedule of Other Assets, Noncurrent [Table Text Block] |
| | | | | | | | | Right-of-Use assets (Note 7) | | $ | 12,745 | | | $ | 7,936 | | | Unamortized debt issuance costs | | | 3,458 | | | | 3,798 | | | Investment in White Cap, LLC | | | 2,917 | | | | 2,590 | | | Unamortized brokerage fee for Monza | | | 2,881 | | | | 3,423 | | | Proportional consolidation of Monza's other assets (Note 4) | | | 4,222 | | | | 5,308 | | | Derivative assets | | | 2,847 | | | | 2,653 | | | Appeal bond deposits | | | — | | | | 6,925 | | | Other | | | 1,014 | | | | 814 | | | Total other assets (long-term) | | $ | 30,084 | | | $ | 33,447 | | |
| Schedule of Accrued Liabilities [Table Text Block] |
| | | | | | | | | Accrued interest | | $ | 24,497 | | | $ | 10,180 | | | Accrued salaries/payroll taxes/benefits | | | 2,715 | | | | 2,377 | | | Incentive compensation plans | | | 1,069 | | | | 9,794 | | | Litigation accruals | | | 3,673 | | | | 3,673 | | | Lease liability (Note 7) | | | 2,472 | | | | 2,716 | | | Derivatives - current | | | — | | | | 1,785 | | | Other | | | 2 | | | | 371 | | | Total accrued liabilities | | $ | 34,428 | | | $ | 30,896 | | |
| Other Noncurrent Liabilities [Table Text Block] |
| | | | | | | | | Dispute related to royalty deductions | | $ | 4,687 | | | $ | 4,687 | | | Dispute related to royalty-in-kind | | | 250 | | | | 250 | | | Derivatives | | | 1,245 | | | | — | | | Lease liability (Note 7) | | | 9,581 | | | | 4,419 | | | Other | | | 701 | | | | 632 | | | Total other liabilities (long-term) | | $ | 16,464 | | | $ | 9,988 | | |