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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) | $ (35,382) |  |
Depreciation, deferred tax liability | (65,312) |  |  |
Depreciation, deferred tax asset |  | 148,419 |  |
Intangible drilling costs | 12,934 | (112,762) |  |
Net capital loss carryforward - U.S. | 44,619 | 117,924 |  |
Tax monetization transaction | (6,465) | (105,789) |  |
State and Investment tax credits | 813 | 1,341 |  |
Production tax credits | 85,193 | 82,451 |  |
Foreign tax credits | 86,206 |  |  |
Withholding tax | (14,400) |  |  |
Stock options amortization | 1,166 | 3,241 |  |
Basis difference in partnership interest | (14,731) | (24,462) |  |
Accrued liabilities and other | 2,931 | (752) |  |
| 70,993 | 74,229 |  |
Less - valuation allowance | (50,858) | (109,611) | $ (70,536) | $ (111,280)
Total | $ 20,135 |  |  |
Total |  | $ (35,382) | $ (32,654) |

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