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Income Taxes - Narrative (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Income Tax Disclosure [Abstract] |  |  |  |
Effective Income Tax Rate Reconciliation, Percent |  |  | 20.00% | 29.40%
Income tax expense | $ (978) | $ 1,842 | $ 3,149 | $ 7,253

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