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Stockholders' Equity | 6 Months Ended
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Jun. 30, 2018
Equity [Abstract] |
Stockholders' Equity | Stockholders’ Equity Repurchases of Class A Common Stock Repurchases of our Class A Common Stock occurred under a repurchase authorization granted by our Board of Directors and related to shares withheld as part of the vesting of restricted stock units ("RSUs"). In February 2016, our Board of Directors authorized the repurchase of up to $250 million of our Class A common stock. Share repurchases under this authorization were as follows:
|  | Repurchases Occurring in the Six Months Ended June 30, 2018 |  | Cumulative Repurchases as of June 30, 2018
|  | Shares |  | Average Price |  | Shares |  | Average Price
2016 Share Repurchase Authorization |  | 640,586 |  |  | $ | 99.89 |  |  | 1,683,311 |  |  | $ | 89.96 |
As of June 30, 2018, we had $98.6 million available for repurchases pursuant to our 2016 share repurchase authorization. In addition, during the first six months of 2018, we repurchased 29,710 shares at an average price of $112.36 per share, for a total of $3.3 million, related to tax withholdings associated with the vesting of RSUs. The repurchase of shares related to tax withholdings associated with stock awards does not reduce the number of shares available for repurchase as approved by our Board of Directors.

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -URI http://asc.fasb.org/topic&trid=2208762 + Details
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