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Nature of Operations, Background, and Basis of Presentation (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018 | Sep. 30, 2018
--- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right of use assets | $ 9,583 |  | $ 0 |
Operating lease obligation | 11,953 |  |  |
Accrued rent offset to operating lease right-of-use assets | $ (2,801) |  |  | $ 0
Accounting Standards Update 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right of use assets |  | $ 10,400 |  |
Operating lease obligation |  | 13,200 |  |
Accrued rent offset to operating lease right-of-use assets |  | $ 2,800 |  |

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