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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, 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%