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Stockholders' Equity (Narrative) (Details) - Class A common stock - USD ($)	9 Months Ended	20 Months Ended
	Sep. 30, 2017	Sep. 30, 2017	Feb. 29, 2016
Equity, Class of Treasury Stock [Line Items]
Authorized repurchase amount			$ 250,000,000
Restricted stock units (RSUs)
Equity, Class of Treasury Stock [Line Items]
Repurchase related to stock award tax withholdings (in shares)	32,300
Average purchase price per share (in dollars per share)	$ 99.33
Repurchase related to stock award tax withholdings	$ 3,200,000
2016 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items]
Remaining authorized repurchase amount	$ 164,800,000	$ 164,800,000
Average purchase price per share (in dollars per share)	$ 91.33	$ 83.25

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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- Definition

For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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

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