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Stockholders' Equity | 9 Months Ended
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Sep. 30, 2020
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"). On October 22, 2018, our Board of Directors approved an additional $250 million repurchase authorization of our Class A common stock, increasing our total share repurchase authorization to $500 million. Share repurchases under this authorization were as follows:
|  | Repurchases Occurring in 2020 |  | Cumulative Repurchases as of September 30, 2020
|  | Shares |  | Average Price |  | Shares |  | Average Price
Share Repurchase Authorization |  | 563,953 |  |  | $ | 81.71 |  |  | 3,719,048 |  |  | $ | 84.02 |
As of September 30, 2020, we had $187.5 million available for repurchases pursuant to our share repurchase authorization. In addition, during 2020, we repurchased 30,143 shares at an average price of $147.12 per share, for a total of $4.4 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. ATM Equity Offering On July 24, 2020, we entered into an ATM Equity Offering Sales Agreement, which allows us to offer and sell, from time to time, shares of our Class A common stock, no par value, having an aggregate gross sales price of up to $400 million. The shares will be issued pursuant to a registration statement on Form S-3 (File No. 333-239969), which became effective upon its filing on July 21, 2020. Under this agreement, we may enter into forward share purchase transactions. As of September 30, 2020, no amounts have been issued in relation to the ATM Equity Offering Sales Agreement.

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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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(e)(1)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 505 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.3-04) -URI http://asc.fasb.org/extlink&oid=120397183&loc=d3e187085-122770 Reference 3: 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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