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Income taxes (Net deferred tax (liabilities) assets) (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | $ (2,157,019) | $ (1,919,478) |
Deferred tax liabilities, intangibles | (7,546) | (9,816) |
Deferred tax liabilities, accrued maintenance liability | (1,575) | (1,790) |
Deferred tax liabilities, obligations under capital leases and debt obligations | (3,343) | (3,806) |
Deferred tax liabilities, investments | (7,836) | (7,996) |
Deferred tax assets, deferred losses on sale of assets | 20,534 | 24,178 |
Valuation allowance | (79,393) | (74,361) | $ (92,298)
Deferred tax assets, losses and credits forward | 1,506,678 | 1,244,191 |
Deferred tax liabilities, other | (52,399) | (66,381) |
Net deferred income tax (liabilities) | (781,899) | (815,259) |
Ireland |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (2,154,075) | (1,924,492) |
Deferred tax liabilities, intangibles | (3,560) | (4,594) |
Deferred tax liabilities, accrued maintenance liability | (1,985) | (3,456) |
Deferred tax liabilities, obligations under capital leases and debt obligations | (3,343) | (3,806) |
Valuation allowance | (7,536) | (5,654) |
Deferred tax assets, losses and credits forward | 1,410,570 | 1,146,434 |
Deferred tax liabilities, other | (52,443) | (58,691) |
Net deferred income tax (liabilities) | (812,372) | (854,259) |
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (14,014) | (606) |
Deferred tax liabilities, intangibles | (3,986) | (5,222) |
Deferred tax assets, accrued maintenance liability | 410 | 1,666 |
Deferred tax liabilities, investments | (7,836) | (7,996) |
Deferred tax assets, deferred losses on sale of assets | 20,534 | 24,178 |
Valuation allowance | (50,805) | (38,720) |
Deferred tax assets, losses and credits forward | 67,697 | 58,099 |
Deferred tax liabilities, other |  | (99) |
Deferred tax asset, other | 1,002 |  |
Net deferred income tax assets | 13,002 | 31,300 |
The Netherlands |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax assets, depreciation and impairment | 12,510 | 6,873 |
Valuation allowance | (4,278) | (16,025) |
Deferred tax assets, losses and credits forward | 12,359 | 20,568 |
Deferred tax liabilities, other |  | (1,773) |
Deferred tax asset, other | 356 |  |
Net deferred income tax assets | 20,947 | 9,643 |
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax liabilities, depreciation/impairment | (1,440) | (1,253) |
Valuation allowance | (16,774) | (13,962) |
Deferred tax assets, losses and credits forward | 16,052 | 19,090 |
Deferred tax liabilities, other | (1,314) | (5,818) |
Net deferred income tax (liabilities) | $ (3,476) | $ (1,943) |

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