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Stockholders' Equity	12 Months Ended
	Dec. 31, 2017
Equity [Abstract]
Stockholders' Equity	15. Stockholders’ Equity Our board of directors is authorized, subject to any limitations imposed by law, without the approval of our stockholders, to issue a total of 25,000,000 shares of preferred stock, in one or more series, with each such series having rights and preferences including voting rights, dividend rights, conversion rights, redemption privileges and liquidation preferences, as our board of directors may determine. We may repurchase shares awarded to certain grant recipients under our various equity compensation plans to satisfy minimum statutory federal, state and local tax withholding obligations arising from the vesting of their equity awards. During the year ended December 31, 2015, 332,799 shares with an average price paid per share of $32.87 were repurchased relating thereto. No shares were repurchased during the years ended December 31, 2017 and 2016. On October 27, 2016, we announced that our board of directors had authorized the company to repurchase up to an aggregate of $250 million of our Class A common stock over three years. As of December 31, 2017, the authorization remained unused.

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- Definition

The entire disclosure for shareholders' equity comprised of portions attributable to the parent entity and noncontrolling interest, including other comprehensive income. Includes, but is not limited to, balances of common stock, preferred stock, additional paid-in capital, other capital and retained earnings, accumulated balance for each classification of other comprehensive income and amount of comprehensive income.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-URI http://asc.fasb.org/topic&trid=2208762

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