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Subsequent Events	6 Months Ended
	Jun. 30, 2018
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events Common Stock Dividend On July 23, 2018, our Board of Directors approved a dividend of $0.29 per share on our Class A and Class B common stock related to our second quarter 2018 financial results. The dividend will total approximately $7.0 million and will be paid on August 29, 2018 to shareholders of record on August 15, 2018. Repurchase of Class A Common Stock Since June 30, 2018, we repurchased 226,910 shares at a weighted average price of $86.65 per share and as of July 27, 2018, under our existing share repurchase authorization, $78.9 million million remained available for share repurchases.

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- Definition

The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 855
-URI http://asc.fasb.org/topic&trid=2122774

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