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Income taxes (Provision for income taxes by tax jurisdiction) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | $ (25,914) | $ 180,435 | $ 160,148
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 5,032 | (17,937) | (12,560)
Current tax (benefit) expense | 3,651 | 5,216 | (3,509)
Income tax (benefit) expense | (17,231) | 167,714 | 144,079
Ireland |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | (31,387) | 154,134 | 140,621
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 1,882 | 2,358 | 368
Current tax (benefit) expense | 0 | 0 | (27)
United States |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 6,180 | 11,327 | 6,510
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 12,085 | (18,425) | (2,838)
Current tax (benefit) expense | 3,016 | 789 | (3,691)
The Netherlands |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | 572 | 7,316 | 4,136
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | (11,746) | 87 | (2,302)
Current tax (benefit) expense | (314) | 261 | (307)
Other |  |  |
Income Tax Disclosure [Line Items] |  |  |
Deferred tax expense (benefit) | (1,279) | 7,658 | 8,881
Deferred tax (benefit) expense related to a (decrease) increase in changes in valuation allowance of deferred tax assets | 2,811 | (1,957) | (7,788)
Current tax (benefit) expense | $ 949 | $ 4,166 | $ 516

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