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Note 18 - Income Taxes (Tables) | 12 Months Ended
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Dec. 31, 2017
Notes Tables |
Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
U.S. |  | $ | 13,680 |  |  | $ | (7,109 | ) |  | $ | (236 | )
Non-U.S. (foreign) |  |  | 157,050 |  |  |  | 148,197 |  |  |  | 113,835 |
Total income from continuing operations, before income taxes and equity in losses of investees |  | $ | 170,730 |  |  | $ | 141,088 |  |  | $ | 113,599 |
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Current: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  | $ | 43,850 |  |  | $ | — |  |  | $ | 51 |
State |  |  | 108 |  |  |  | (276 | ) |  |  | 252 |
Foreign |  |  | 10,816 |  |  |  | 14,040 |  |  |  | 19,175 |
Total current income tax expense |  | $ | 54,774 |  |  | $ | 13,764 |  |  | $ | 19,478 |
Deferred: |  |  |  |  |  |  |  |  |  |  |  |
Federal |  |  | (78,220 | ) |  |  | — |  |  |  | — |
State |  |  | (4,544 | ) |  |  | — |  |  |  | — |
Foreign |  |  | 26,579 |  |  |  | 18,073 |  |  |  | (34,736 | )
Total deferred tax benefit |  |  | (56,185 | ) |  |  | 18,073 |  |  |  | (34,736 | )
Total provision (benefit) for income taxes |  | $ | (1,411 | ) |  | $ | 31,837 |  |  | $ | (15,258 | )
Components Of Deferred Income Tax Expense (Benefit) [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Other deferred tax expense (exclusive of the effect of other components listed below) |  | $ | 1,833 |  |  | $ | (1,105 | ) |  | $ | 541 |
Usage (benefit) of operating loss carryforwards - U.S. |  |  | 73,049 |  |  |  | (14,072 | ) |  |  | (30,596 | )
Change in valuation allowance |  |  | (58,757 | ) |  |  | 16,411 |  |  |  | (14,324 | )
Change in foreign valuation allowance |  |  | — |  |  |  | — |  |  |  | (49,701 | )
Change in foreign income tax |  |  | 26,579 |  |  |  | 18,073 |  |  |  | 14,965 |
Change in lease transaction |  |  | — |  |  |  | — |  |  |  | (452 | )
Change in tax monetization transaction |  |  | (23,234 | ) |  |  | 48,000 |  |  |  | 16,386 |
Change in depreciation |  |  | 129,408 |  |  |  | (55,462 | ) |  |  | 28,370 |
Change in foreign tax credits |  |  | (86,206 | ) |  |  | — |  |  |  | — |
Change in withholding tax |  |  | 14,400 |  |  |  | — |  |  |  | — |
Change in state and investment tax credits |  |  | (144 | ) |  |  | — |  |  |  | — |
Change in intangible drilling costs |  |  | (118,610 | ) |  |  | 10,227 |  |  |  | 10,335 |
Change in production tax credits and alternative minimum tax credit |  |  | (2,070 | ) |  |  | (11,659 | ) |  |  | 610 |
Basis difference in partnership interests |  |  | (12,433 | ) |  |  | 7,660 |  |  |  | (10,870 | )
|  | $ | (56,185 | ) |  | $ | 18,073 |  |  | $ | (34,736 | )
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
U.S. federal statutory tax rate |  |  | 35.0 | % |  |  | 35.0 | % |  |  | 35.0 | %
Impact of federal tax reform |  |  | (13.2 | ) |  |  | - |  |  |  | - |
Transition tax inclusion |  |  | 42.1 |  |  |  | - |  |  |  | - |
Foreign tax credits |  |  | (50.4 | ) |  |  | - |  |  |  | - |
Tax basis adjustment |  |  | (4.7 | ) |  |  | - |  |  |  | - |
Withholding tax |  |  | 34.1 |  |  |  | - |  |  |  | - |
Valuation allowance - U.S. |  |  | (30.3 | ) |  |  | 11.1 |  |  |  | (1.4 | )
Valuation allowance - foreign |  |  | - |  |  |  | - |  |  |  | (43.8 | )
State income tax, net of federal benefit |  |  | (2.2 | ) |  |  | (0.2 | ) |  |  | 0.6 |
Effect of foreign income tax, net |  |  | (10.3 | ) |  |  | (14.1 | ) |  |  | (5.1 | )
Production tax credits |  |  | (1.2 | ) |  |  | (8.3 | ) |  |  | (0.1 | )
Subpart F income |  |  | 1.7 |  |  |  | 0.3 |  |  |  | 1.3 |
Other, net |  |  | (1.4 | ) |  |  | (1.3 | ) |  |  | - |
Effective tax rate |  |  | (0.8% | ) |  |  | 22.5 | % |  |  | (13.5% | )
Schedule of Deferred Tax Assets and Liabilities [Table Text Block] |
|  | December 31, |
|  | 2017 |  |  | 2016 |
|  | (Dollars in thousands) |
Deferred tax assets (liabilities): |  |  |  |  |  |  |  |
Net foreign deferred taxes, primarily depreciation |  | $ | (61,961 | ) |  | $ | (35,382 | )
Depreciation |  |  | (65,312 | ) |  |  | 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 | )
Total |  | $ | 20,135 |  |  | $ | (35,382 | )
Summary of Valuation Allowance [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Balance at beginning of the year |  | $ | 109,611 |  |  | $ | 70,536 |  |  | $ | 111,280 |
Additions to valuation allowance |  |  | 46,560 |  |  |  | 39,075 |  |  |  | - |
Release of valuation allowance |  |  | (105,313 | ) |  |  | - |  |  |  | (40,744 | )
Balance at end of the year |  | $ | 50,858 |  |  | $ | 109,611 |  |  | $ | 70,536 |
Schedule of Deferred Taxes Classified in Balance Sheet [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Non-current deferred tax assets |  | $ | 107,605 |  |  | $ | — |  |  | $ | — |
Non-current deferred tax liabilities |  |  | (87,470 | ) |  |  | (35,382 | ) |  |  | (32,654 | )
Total Non-current deferred tax assets, net |  |  | 20,135 |  |  |  | (35,382 | ) |  |  | (32,654 | )
Uncertain tax benefit offset (1) |  |  | (95 | ) |  |  | — |  |  |  | — |
|  | $ | 20,040 |  |  | $ | (35,382 | ) |  | $ | (32,654 | )
Summary of Income Tax Contingencies [Table Text Block] |
|  | Year Ended December 31, |
|  | 2017 |  |  | 2016 |  |  | 2015 |
|  | (Dollars in thousands) |
Balance at beginning of year |  | $ | 5,738 |  |  | $ | 10,385 |  |  | $ | 7,511 |
Additions based on tax positions taken in prior years |  |  | 798 |  |  |  | 675 |  |  |  | (198 | )
Additions based on tax positions taken in the current year |  |  | 2,367 |  |  |  | 1,059 |  |  |  | 4,386 |
Reduction based on tax positions taken in prior years |  |  | (13 | ) |  |  | (6,381 | ) |  |  | (1,314 | )
Balance at end of year |  | $ | 8,890 |  |  | $ | 5,738 |  |  | $ | 10,385 |
Summary of Income Tax Examinations [Table Text Block] |
Israe l | 2015 | — | 2017
Kenya | 2012 | — | 2017
Guatemala | 2013 | — | 2017
Honduras | 2012 | — | 2017
Guadeloupe | 2015 | — | 2017
Philippines | 2010 | — | 2017
New Zealand | 2012 | — | 2017

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