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Income tax Effective Income Tax Rate Reconcilitation (Details) | 3 Months Ended
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Mar. 31, 2020 | Mar. 31, 2019
Income Tax Disclosure [Abstract] |  |
Federal statutory tax rate | 21.00% | 21.00%
Federal tax credits | (10.90%) | (12.70%)
State and local taxes, net of federal tax benefit | 7.40% | 6.50%
Flow through depreciation and cost basis differences | 1.60% | 1.30%
Excess deferred tax amortization | (1.90%) | (3.70%)
Other | 1.00% | 0.70%
Effective tax rate | 18.20% | 13.10%

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