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Note 18 - Income Taxes - Net Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | --- | --- | ---
Deferred tax assets (liabilities): |  |  |  |
Net foreign deferred taxes, primarily depreciation | $ (61,961) | $ (36,413) |  |
Depreciation, deferred tax liability | (65,315) |  |  |
Depreciation, deferred tax asset |  | (10,253) |  |
Intangible drilling costs | 13,003 | 24,856 |  |
Net capital loss carryforward - U.S. | 55,084 | 127,633 |  |
Tax monetization transaction | (13,134) | (96,293) |  |
State and Investment tax credits | 813 | 1,341 |  |
Production tax credits | 85,193 | 82,435 |  |
Foreign tax credits | 86,206 |  |  |
Withholding tax | (14,400) |  |  |
Stock options amortization | 1,166 | 1,476 |  |
Basis difference in partnership interest | (16,817) | (18,200) |  |
Accrued liabilities and other | 3,109 | 3,241 |  |
Total deferred tax assets (liabilities) | 72,947 | 79,823 |  |
Less - valuation allowance | (77,571) | (116,234) | $ (92,898) | $ (183,598)
Total | (4,624) |  |  |
Total | $ (4,719) | $ (36,411) | $ (28,989) |

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