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Income taxes (Net deferred tax (liabilities) assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | --- | ---
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | $ (1,325,739) | $ (1,038,739) |
Deferred tax liabilities, intangibles | (9,500) | (22,595) |
Deferred tax liabilities, interest expense | (166) | (588) |
Deferred tax liabilities, accrued maintenance liability | (307) |  |
Deferred tax assets, accrued maintenance liability |  | 6,782 |
Deferred tax liabilities, obligations under capital leases and debt obligations | (4,691) | (3,151) |
Deferred tax liabilities, investments | (8,095) | (12,641) |
Deferred tax assets, deferred losses on sale of assets | 32,119 | 66,119 |
Deferred tax assets, accrued expenses | 7,338 | 13,942 |
Valuation allowance | (104,858) | (127,361) | $ (72,000)
Deferred tax assets, losses and credits forward | 961,812 | 805,881 |
Deferred tax liabilities, other | (70,627) | (51,183) |
Net deferred income tax (liabilities) | (522,714) | (363,534) |
Ireland |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (1,336,757) | (1,030,901) |
Deferred tax liabilities, intangibles | (4,159) | (6,353) |
Deferred tax liabilities, accrued maintenance liability | (4,362) | (6,028) |
Deferred tax liabilities, obligations under capital leases and debt obligations | (4,691) | (3,151) |
Valuation allowance | (2,928) | (1,562) |
Deferred tax assets, losses and credits forward | 850,774 | 666,214 |
Deferred tax liabilities, other | (70,042) | (46,133) |
Net deferred income tax (liabilities) | (572,165) | (427,914) |
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment |  | (16,322) |
Deferred tax assets, depreciation and impairment | 1,553 |  |
Deferred tax liabilities, intangibles | (5,341) | (16,242) |
Deferred tax liabilities, interest expense | (166) | (588) |
Deferred tax assets, accrued maintenance liability | 4,055 | 12,810 |
Deferred tax liabilities, investments | (8,095) | (12,641) |
Deferred tax assets, deferred losses on sale of assets | 32,119 | 66,119 |
Deferred tax assets, accrued expenses | 7,338 | 13,942 |
Valuation allowance | (59,983) | (89,130) |
Deferred tax assets, losses and credits forward | 59,260 | 92,215 |
Deferred tax liabilities, other | (2,543) |  |
Deferred tax assets, other |  | 5,539 |
Net deferred income tax assets | 28,197 | 55,702 |
The Netherlands |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, depreciation and impairment | 9,138 | 8,547 |
Valuation allowance | (18,240) | (26,758) |
Deferred tax assets, losses and credits forward | 26,047 | 26,759 |
Deferred tax liabilities, other | (542) | (4,399) |
Net deferred income tax assets | 16,403 | 4,149 |
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment |  | (63) |
Deferred tax assets, depreciation and impairment | 327 |  |
Valuation allowance | (23,707) | (9,911) |
Deferred tax assets, losses and credits forward | 25,731 | 20,693 |
Deferred tax liabilities, other |  | (6,190) |
Deferred tax assets, other | 2,500 |  |
Net deferred income tax assets | $ 4,851 | $ 4,529 |

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