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Income Tax Income Tax (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Income Tax [Abstract] |  |  |  |
Increase (Decrease) in Deferred Income Taxes |  |  | $ (1,591) | $ (1,380)
Income Tax Expense (Benefit) | $ 509 | $ 1,319 | $ 2,182 | $ 1,967
Effective income tax rate |  |  | 28.60% | 30.70%

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