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Stockholders' Equity - Treasury Stock (Details) - USD ($) $ in Thousands | 12 Months Ended | 24 Months Ended |
--- | --- | --- | ---
Dec. 31, 2018 | Dec. 11, 2019 | Dec. 11, 2017
Treasury Stock |  |  |
Authorized amount of common stock repurchase (in dollars) |  |  | $ 100,000
Purchase of common stock | $ 11,309 | $ 14,300 |

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