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Stockholders' Equity (Details) - USD ($) shares in Thousands, $ in Millions | Jan. 01, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Stockholders' Equity |  |  |
Number of common stock authorized |  | 75,000 | 75,000
Number of common stock outstanding |  | 32,558 | 32,048
Share repurchase program expiration period | 1 year |  |
Maximum |  |  |
Stockholders' Equity |  |  |
Share repurchase program common stock authorized amount | $ 35 |  |

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