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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract] |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets, Net | $ 6,235 |  |  |  | $ 12,563 |  |  |  | $ 6,235 | $ 12,563 |
Total income tax expense (benefit) | 2,803 | $ 1,396 | $ 1,207 | $ 1,300 | 4,702 | $ 594 | $ 1,572 | $ 322 | 6,706 | 7,190 |
Unrecognized tax benefits | $ 198 |  |  |  | $ 129 |  |  |  | $ 198 | $ 129 | $ 57

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