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Income Taxes (Details) | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Taxes |  |  |  |
Effective tax rate (as a percent) | 25.00% | 24.00% | 25.00% | 24.00%
Income tax at U.S. federal statutory tax rate (as a percent) |  |  | 21.00% | 21.00%

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