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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
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%