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Income taxes - Reconciliation of U.S. Federal Statutory Tax Rate to Actual Consolidated Tax Expense (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Statutory tax rate | $ 119,945 | $ (33,806) | $ 53,674
State income taxes, net of federal tax benefit | 13,149 | (15,863) | 4,859
Valuation allowance | (10,477) | (33,576) | 1,589
Tax examinations including change in reserve for uncertain tax positions | 567 | 5,665 | 5,546
Adjustments to prior year deferred taxes | (2,110) | 1,239 | (265)
Foreign earnings taxed at other than U.S. rates | 12,334 | 9,659 | 3,275
Divestiture of business | 0 | (808) | (15,356)
Effect of tax rate changes | (2,151) | 275 | (523)
Foreign withholding taxes | 4,670 | 8,107 | 2,157
Tax credits | (14,077) | (21,936) | (13,529)
Global intangible low-taxed income (GILTI) | 2,851 | 11,323 | 15,795
Foreign-derived intangible income | (657) | (202) | (1,238)
Foreign currency gain/(loss) on distributions of previously taxed income | (1,280) | 3,365 | (344)
Other, net | (4,255) | (872) | (2,610)
Total taxes | $ 118,509 | $ (67,430) | $ 53,030
Effective Income Tax Rate Reconciliation, Percent [Abstract] |  |  |
Statutory tax rate (percent) | 21.00% | 21.00% | 21.00%
State income taxes, net of federal tax benefit (percent) | 2.30% | 9.90% | 1.90%
Valuation allowance (percent) | (1.80%) | 20.90% | 0.60%
Tax examinations including change in reserve for uncertain tax positions (percent) | 0.10% | (3.50%) | 2.20%
Adjustments to prior year deferred taxes (percent) | (0.40%) | (0.80%) | (0.10%)
Foreign earnings taxed at other than U.S. rates (percent) | 2.20% | (6.00%) | 1.30%
Disposition of business (percent) | 0.00% | 0.50% | (6.00%)
Effect of tax rate changes (percent) | (0.40%) | (0.20%) | (0.20%)
Deduction related to qualified production activities (percent) | 0.80% | (5.00%) | 0.80%
Tax credit (percent) | (2.50%) | 13.60% | (5.30%)
Global intangible low-tax income (GILTI) (percent) | 0.50% | (7.00%) | 6.20%
Foreign-derivative intangible income (percent) | (0.10%) | 0.10% | (0.50%)
Foreign currency gain/(loss) on distributions of previously taxed income (percent) | (0.20%) | (2.10%) | (0.10%)
Other, net (percent) | (0.70%) | 0.50% | (1.00%)
Total taxes (percent) | 20.70% | 41.90% | 20.80%

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