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Income taxes (Net deferred tax (liabilities) assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | $ (1,919,478) | $ (1,607,193) |
Deferred tax liabilities, intangibles | (9,816) | (13,119) |
Deferred tax liabilities, accrued maintenance liability | (1,790) |  |
Deferred tax assets, accrued maintenance liability |  | 1,267 |
Deferred tax liabilities, obligations under capital leases and debt obligations | (3,806) | (4,255) |
Deferred tax liabilities, investments | (7,996) | (8,619) |
Deferred tax assets, deferred losses on sale of assets | 24,178 | 28,770 |
Valuation allowance | (74,361) | (92,298) | $ (104,858)
Deferred tax assets, losses and credits forward | 1,244,191 | 1,110,815 |
Deferred tax liabilities, other | (66,381) | (81,685) |
Net deferred income tax (liabilities) | (815,259) | (666,317) |
Ireland |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (1,924,492) | (1,612,534) |
Deferred tax liabilities, intangibles | (4,594) | (7,011) |
Deferred tax liabilities, accrued maintenance liability | (3,456) | (3,242) |
Deferred tax liabilities, obligations under capital leases and debt obligations | (3,806) | (4,255) |
Valuation allowance | (5,654) | (3,296) |
Deferred tax assets, losses and credits forward | 1,146,434 | 996,676 |
Deferred tax liabilities, other | (58,691) | (77,973) |
Net deferred income tax (liabilities) | (854,259) | (711,635) |
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (606) |  |
Deferred tax assets, depreciation and impairment |  | 254 |
Deferred tax liabilities, intangibles | (5,222) | (6,108) |
Deferred tax assets, accrued maintenance liability | 1,666 | 4,509 |
Deferred tax liabilities, investments | (7,996) | (8,619) |
Deferred tax assets, deferred losses on sale of assets | 24,178 | 28,770 |
Valuation allowance | (38,720) | (57,145) |
Deferred tax assets, losses and credits forward | 58,099 | 62,351 |
Deferred tax liabilities, other | (99) |  |
Deferred tax asset, other |  | 502 |
Net deferred income tax assets | 31,300 | 24,514 |
The Netherlands |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, depreciation and impairment | 6,873 | 5,974 |
Valuation allowance | (16,025) | (15,938) |
Deferred tax assets, losses and credits forward | 20,568 | 28,770 |
Deferred tax liabilities, other | (1,773) | (1,760) |
Net deferred income tax assets | 9,643 | 17,046 |
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (1,253) | (887) |
Valuation allowance | (13,962) | (15,919) |
Deferred tax assets, losses and credits forward | 19,090 | 23,018 |
Deferred tax liabilities, other | (5,818) | (2,454) |
Net deferred income tax (liabilities) | $ (1,943) |  |
Net deferred income tax assets |  | $ 3,758 |

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