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Income tax Effective Income Tax Rate Reconcilitation (Details) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 21.00% | 21.00%
Federal tax credits | (14.40%) | (15.10%) | (12.00%) | (13.30%)
State and local taxes, net of federal tax benefit | 10.90% | 6.50% | 8.50% | 6.50%
Flow through depreciation and cost basis differences | (2.60%) | 0.40% | 0.30% | 1.40%
Excess deferred tax amortization | (2.50%) | (2.70%) | (2.10%) | (3.20%)
Other | (1.00%) | 0.60% | 0.40% | 0.10%
Effective tax rate | 11.40% | 10.70% | 16.10% | 12.50%

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