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Income tax Effective Income Tax Rate Reconcilitation (Details) | 3 Months Ended
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Mar. 31, 2023 | Mar. 31, 2022
Income Tax Disclosure [Abstract] |  |
Federal statutory tax rate | 21.00% | 21.00%
Federal tax credits | (9.30%) | (10.50%)
State and local taxes, net of federal tax benefit | 9.00% | 8.90%
Flow through depreciation and cost basis differences | 1.00% | 0.70%
Excess deferred tax amortization | (3.70%) | (4.50%)
Effective Income Tax Rate Reconciliation,Other Reconciling Items, Percent | (2.10%) | (0.10%)
Effective tax rate | 15.90% | 15.50%

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