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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Tax Disclosure [Abstract] |  |  |  |
Income tax expense (benefit) | $ 2,673 | $ 7,491 | $ 7,244 | $ 13,292
Effective tax rate | 22.90% | 34.60% | 22.10% | 31.30%
Federal statutory rate | 21.00% |  |  | 35.00%

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