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Income tax Effective Income Tax Rate Reconcilitation (Details) | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Income Tax Disclosure [Abstract] |  |
Federal statutory tax rate | 21.00% | 21.00%
Federal tax credits | (9.50%) | (16.20%)
State and local taxes, net of federal tax benefit | 8.60% | 9.10%
Flow through depreciation and cost basis differences | (0.50%) | 0.20%
Excess deferred tax amortization | (2.00%) | (3.30%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | (0.40%) | (0.60%)
Effective tax rate | 18.00% | 10.70%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent | 0.80% | 0.50%

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