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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017
Income Taxes [Abstract] |  |  |  |
Provision for income taxes | $ 3,467 | $ 3,809 | $ 10,520 | $ 13,569
Effective income tax rate | 20.70% | 32.10% | 20.10% | 34.20%

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