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Nature of Business and Basis of Presentation - Narrative (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Right-of-use assets |  | $ 24,375 | $ 0
Lease liabilities |  | $ 29,091 |
ASU 2016-02 |  |  |
Revenue, Initial Application Period Cumulative Effect Transition [Line Items] |  |  |
Right-of-use assets | $ 24,300 |  |
Property and equipment | 2,800 |  |
Lease liabilities | 29,600 |  |
Cumulative effect on retained earnings | $ 1,900 |  |

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