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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Abstract] |  |  |
Federal statutory tax rate | 21.00% | 21.00% | 35.00%
Federal tax credits | (13.40%) | (16.70%) | (14.00%)
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Percent | 0.00% | 0.00% | 6.10%
State and local taxes, net of federal tax benefit | 6.50% | 6.50% | 5.00%
Flow through depreciation and cost basis differences | 1.50% | 1.50% | 1.50%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amortization, Percent | (3.70%) | (4.10%) | 0.00%
Other | (0.70%) | (0.80%) | (2.10%)
Effective tax rate | 11.20% | 7.40% | 31.50%

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