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Subsequent Events (Details) - Class A common stock - USD ($) |  | 1 Months Ended | 9 Months Ended | 32 Months Ended |
--- | --- | --- | --- | --- | ---
Oct. 22, 2018 | Oct. 26, 2018 | Sep. 30, 2018 | Sep. 30, 2018 | Feb. 29, 2016
Subsequent Event [Line Items] |  |  |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) |  |  | 1,199,257 | 2,241,982 |
Authorized repurchase amount |  |  |  |  | $ 250,000,000
2016 Share Repurchase Authorization |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Remaining authorized repurchase amount |  |  | $ 50,900,000 | $ 50,900,000 |
Subsequent Event |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Shares repurchased pursuant to repurchase authorizations (in shares) |  | 423,863 |  |  |
Average purchase price per share (in dollars per share) |  | $ 76.85 |  |  |
Increase in authorized repurchase amount | $ 250,000,000 |  |  |  |
Subsequent Event | 2016 Share Repurchase Authorization |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Remaining authorized repurchase amount |  | $ 18,300,000 |  |  |
Subsequent Event | 2018 Stock Repurchase Authorization |  |  |  |  |
Subsequent Event [Line Items] |  |  |  |  |
Authorized repurchase amount |  | $ 268,000,000 |  |  |

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- Definition Amount of stock repurchase plan authorized. + References No definition available. + Details
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- Definition Total cost of shares repurchased divided by the total number of shares repurchased. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6405813&loc=d3e23239-112655 + Details
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