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Income Taxes Reconciliation of statutory federal income tax rate to effective income tax rate (Details) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Income taxes at federal statutory rate | 21.00% | 21.00% | 35.00%
Effect of state and local income taxes, net of federal tax | 3.70% | 4.00% | 3.10%
Tax accounting method change | 0.00% | (2.50%) | 0.00%
Changes in tax laws, including the Tax Act | 0.20% | 1.00% | 18.30%
Deferred tax asset valuation allowance | (0.40%) | 0.90% | (1.10%)
Tax contingencies | (0.10%) | 0.10% | (1.00%)
Other | (0.30%) | (0.30%) | (1.90%)
Effective rate | 24.10% | 24.20% | 52.40%

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