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Stockholders' Equity (Schedule of Stock Repurchased and Retired) (Details) - Class A common stock - $ / shares	6 Months Ended	29 Months Ended
	Jun. 30, 2018	Jun. 30, 2018
Equity, Class of Treasury Stock [Line Items]
Shares repurchased pursuant to repurchase authorizations (in shares)	640,586	1,683,311
Average purchase price (in dollars per share)	$ 99.89	$ 89.96

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- Definition

Represents the average purchase price per share for stocks repurchased and retired during the period.

+ References

No definition available.

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- Definition

Number of shares that have been repurchased and retired during the period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
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-Topic 210
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