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Income Taxes (Reconciliation of Income Tax Expense to US Statutory Rate) (Details) - USD ($)
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Reconciliation of income tax expense      
Income tax expense at U.S. statutory rate $ 20,500,000 $ 25,600,000 $ 14,100,000
Income tax expense attributable to noncontrolling interests (1,300,000) (900,000) (1,100,000)
State and other income taxes, net of federal income tax effects 3,000,000.0 (900,000) 1,600,000
Foreign income taxes 3,100,000 4,800,000 0
R&D tax credit (700,000) (4,000,000.0) 0
Non-deductible equity compensation 2,800,000 3,000,000.0 3,400,000
Return to provision adjustments (1,800,000) (100,000) (100,000)
Change in valuation allowance 8,800,000 (11,000,000.0) 500,000
Other (100,000) 300,000 (100,000)
Total $ 34,300,000 $ 16,800,000 $ 18,300,000
Reconciliation of income tax expense (as a percent)      
Income tax expense at U.S. statutory rate 21.00% 21.00% 21.00%
Income attributable to noncontrolling interests in partnerships (1.30%) (0.70%) (1.70%)
State and other income taxes, net of federal income tax effects 3.10% (0.70%) 2.40%
Foreign income taxes 3.10% 4.00% 0.00%
R&D tax credit (0.70%) (3.40%) 0.00%
Non-deductible equity compensation 2.90% 2.50% 4.90%
Return to provision adjustments (1.80%) (0.10%) (0.10%)
Change in valuation allowance 9.00% (9.00%) 0.80%
Other (0.20%) 0.20% (0.10%)
Income tax expense at effective tax rate 35.10% 13.80% 27.20%
Valuation Allowance [Line Items]      
Income tax expense attributable to noncontrolling interests $ 1,300,000 $ 900,000 $ 1,100,000
Impact of change in tax laws   4,900,000 1,300,000
Impact of research and development tax credits 700,000 4,000,000.0 $ 0
Indiana Harbor      
Reconciliation of income tax expense      
Income tax expense attributable to noncontrolling interests 0    
Valuation Allowance [Line Items]      
Income tax expense attributable to noncontrolling interests 0    
Foreign Tax Credit Carryforward      
Valuation Allowance [Line Items]      
Valuation allowance, increase (decrease) $ 8,400,000 $ (11,300,000)