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Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Income Tax Disclosure [Abstract] |  |  |  |  |
Current income tax expense (benefit) | $ 113 | $ 114 | $ 221 | $ 252 |
Deferred tax assets valuation allowance | 28,900 |  | 28,900 |  | $ 31,700
Deferred tax expense | $ 800 |  | $ 1,561 | $ 1,299 |

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