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Stockholders' Equity (Details) | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2018 transaction | Nov. 30, 2017 USD ($) | Jun. 30, 2015 USD ($)
Common Class A [Member] |  |  |
Class of Stock [Line Items] |  |  |
Share repurchase program authorized amount |  |  | $ 150,000,000
ASR transaction accounted for as a treasury stock repurchase |  | $ 150,000,000 |
Accelerated Share Repurchase Agreement [Member] |  |  |
Class of Stock [Line Items] |  |  |
Stock repurchase program, number of transactions | transaction | 2 |  |

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