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Stockholders' Equity (Share Repurchases) (Details) - Class A common stock - 2016 Share Repurchase Authorization - $ / shares	6 Months Ended	17 Months Ended
	Jun. 30, 2017	Jun. 30, 2017
Equity, Class of Treasury Stock [Line Items]
Shares repurchased pursuant to repurchase authorizations (in shares)	247,000	960,725
Average purchase price per share (in dollars per share)	$ 87.94	$ 81.85

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(28))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
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-Section 50
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-Name Accounting Standards Codification
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Total cost of shares repurchased divided by the total number of shares repurchased.

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-Name Accounting Standards Codification
-Topic 505
-SubTopic 30
-Section 45
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