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Income Taxes (Schedule of Effective Income Tax Rate Reconciliation) (Details) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Statutory federal income tax rate | 21.00% | 35.00% | 35.00%
State income taxes, net of federal tax benefit | 4.00% | 2.90% | 3.30%
Domestic production activities deduction |  | (2.60%) | (2.30%)
Impact of Accounting Standard Update 2016-09 |  | (0.90%) |
Impact of Tax Cuts and Jobs Act on deferred taxes |  | (0.70%) |
Other items | 0.90% | (0.90%) | (0.40%)
Effective income tax rate | 25.90% | 32.80% | 35.60%

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