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Stockholders' Equity ASR Activity (Details) - Common Class A [Member] - USD ($) $ / shares in Units, shares in Thousands | 1 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Mar. 31, 2017 | Jun. 30, 2018 | Nov. 30, 2017
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, value |  |  | $ 150,000,000
March 2017 ASR [Member] |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |
Treasury stock, shares acquired | 1,300 | 1,326 |
Treasury stock acquired, average cost per share (in USD per share) |  | $ 38.64 |
Treasury stock, value |  | $ 50,000,000 |
Treasury stock, cash settled amount |  | $ 2,000,000 |

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