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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, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Income Tax Rate Reconciliation, Amount [Abstract] |  |  |
Statutory tax rate | $ 129,115 | $ 119,945 | $ (33,806)
State income taxes, net of federal tax benefit | 16,051 | 13,149 | (15,863)
Valuation allowance | 4,486 | (10,477) | (33,576)
Tax examinations including change in reserve for uncertain tax positions | 2,183 | 567 | 5,665
Adjustments to prior year deferred taxes | (2,489) | (2,110) | 1,239
Foreign earnings taxed at other than U.S. rates | 13,704 | 12,334 | 9,659
Divestiture of business | 464 | 0 | (808)
Effect of tax rate changes | 387 | (2,151) | 275
Foreign withholding taxes | 4,635 | 4,670 | 8,107
Tax credits | (18,841) | (14,077) | (21,936)
Global intangible low-taxed income (GILTI) | 2,930 | 2,851 | 11,323
Foreign-derived intangible income | (1,106) | (657) | (202)
Foreign currency gain/(loss) on distributions of previously taxed income | (2,614) | (1,280) | 3,365
Other, net | 373 | (4,255) | (872)
Total taxes | $ 149,278 | $ 118,509 | $ (67,430)
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) | 2.60% | 2.30% | 9.90%
Valuation allowance (percent) | 0.70% | (1.80%) | 20.90%
Tax examinations including change in reserve for uncertain tax positions (percent) | 0.40% | 0.10% | (3.50%)
Adjustments to prior year deferred taxes (percent) | (0.40%) | (0.40%) | (0.80%)
Foreign earnings taxed at other than U.S. rates (percent) | 2.20% | 2.20% | (6.00%)
Disposition of business (percent) | 0.10% | 0.00% | 0.50%
Effect of tax rate changes (percent) | 0.10% | (0.40%) | (0.20%)
Deduction related to qualified production activities (percent) | 0.80% | 0.80% | (5.00%)
Tax credit (percent) | (3.10%) | (2.50%) | 13.60%
Global intangible low-tax income (GILTI) (percent) | 0.50% | 0.50% | (7.00%)
Foreign-derivative intangible income (percent) | (0.20%) | (0.10%) | 0.10%
Foreign currency gain/(loss) on distributions of previously taxed income (percent) | (0.40%) | (0.20%) | (2.10%)
Other, net (percent) | 0.10% | (0.70%) | 0.50%
Total taxes (percent) | 24.30% | 20.70% | 41.90%

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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to other income tax settlements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 + Details
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