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Subsequent Events	6 Months Ended
	Jun. 30, 2019
Subsequent Events
Subsequent Events	14. Subsequent Events ​ On July 29, 2019, the Company declared a quarterly dividend of twenty-three cents ($0.23) per share on each outstanding share of Class A common stock and Class B common stock payable on September 13, 2019 to stockholders of record on August 30, 2019.

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- References

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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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