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Stockholders' Equity - Share repurchase programs (Details) - USD ($) $ in Thousands, shares in Millions | 3 Months Ended |  |
--- | --- | --- | ---
Mar. 31, 2018 | Oct. 31, 2017 | Jan. 31, 2017
Stockholders' Equity |  |  |
Number of shares of common stock issued | 0.5 |  |
Program Amount authorized to repurchase |  | $ 100,000 | $ 100,000

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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