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Income taxes (Provision for income taxes by tax jurisdiction) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | $ 180,435 | $ 160,148 | $ 179,524
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | (17,937) | (12,560) | (22,503)
Current tax (benefit) expense | 5,216 | (3,509) | 7,697
Provision for income taxes | 167,714 | 144,079 | 164,718
Ireland |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 154,134 | 140,621 | 144,532
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 2,358 | 368 | 1,366
Current tax (benefit) expense | 0 | (27) | 5,606
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 11,327 | 6,510 | 56,650
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | (18,425) | (2,838) | (29,147)
Current tax (benefit) expense | 789 | (3,691) | (1,659)
The Netherlands |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 7,316 | 4,136 | (7,470)
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 87 | (2,302) | (8,518)
Current tax (benefit) expense | 261 | (307) | 717
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 7,658 | 8,881 | (14,188)
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | (1,957) | (7,788) | 13,796
Current tax (benefit) expense | $ 4,166 | $ 516 | $ 3,033

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