Treasury Stock	9 Months Ended
Sep. 30, 2021
Equity [Abstract]
Treasury Stock	(8) Treasury Stock The Board of Directors has authorized the Company’s repurchase of up to an aggregate of $800.0 million of its class A common stock from time to time on the open market through April 29, 2023 (the “Share Repurchase Program”), although the program may be suspended or discontinued by the Company at any time. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. The Share Repurchase Program may be funded using the Company’s working capital, as well as proceeds from any other funding arrangements that the Company may enter into in the future. During the three and nine months ended September 30, 2021, the Company did not repurchase any shares of its class A common stock pursuant to the Share Repurchase Program. During the three months ended September 30, 2020, the Company did not repurchase any shares of its class A common stock pursuant to the Share Repurchase Program. During the nine months ended September 30, 2020, the Company repurchased an aggregate of 444,769 shares of its class A common stock at an average price per share of $139.12 and an aggregate cost of $61.9 million pursuant to the Share Repurchase Program. As of September 30, 2021, the Company had repurchased an aggregate of 5,674,226 shares of its class A common stock at an average price per share of $104.13 and an aggregate cost of $590.9 million pursuant to the Share Repurchase Program. As of September 30, 2021, $209.1 million of the Company’s class A common stock remained available for repurchase pursuant to the Share Repurchase Program. The average price per share and aggregate cost amounts disclosed above include broker commissions. During the three and nine months ended September 30, 2020, the Company repurchased an aggregate of 432,313 shares of its class A common stock through a “modified Dutch Auction” tender offer (the “Offer”) at a price of $140.00 per share for an aggregate cost of $61.3 million, inclusive of $0.8 million in certain fees and expenses related to the Offer. The Offer expired in September 2020.

Treasury Stock

9 Months Ended

Sep. 30, 2021

(8) Treasury Stock

The Board of Directors has authorized the Company’s repurchase of up to an aggregate of $800.0 million of its class A common stock from time to time on the open market through April 29, 2023 (the “Share Repurchase Program”), although the program may be suspended or discontinued by the Company at any time. The timing and amount of any shares repurchased will be determined by the Company’s management based on its evaluation of market conditions and other factors. The Share Repurchase Program may be funded using the Company’s working capital, as well as proceeds from any other funding arrangements that the Company may enter into in the future.

During the three and nine months ended September 30, 2021, the Company did not repurchase any shares of its class A common stock pursuant to the Share Repurchase Program. During the three months ended September 30, 2020, the Company did not repurchase any shares of its class A common stock pursuant to the Share Repurchase Program. During the nine months ended September 30, 2020, the Company repurchased an aggregate of 444,769 shares of its class A common stock at an average price per share of $139.12 and an aggregate cost of $61.9 million pursuant to the Share Repurchase Program. As of September 30, 2021, the Company had repurchased an aggregate of 5,674,226 shares of its class A common stock at an average price per share of $104.13 and an aggregate cost of $590.9 million pursuant to the Share Repurchase Program. As of September 30, 2021, $209.1 million of the Company’s class A common stock remained available for repurchase pursuant to the Share Repurchase Program. The average price per share and aggregate cost amounts disclosed above include broker commissions.

During the three and nine months ended September 30, 2020, the Company repurchased an aggregate of 432,313 shares of its class A common stock through a “modified Dutch Auction” tender offer (the “Offer”) at a price of $140.00 per share for an aggregate cost of $61.3 million, inclusive of $0.8 million in certain fees and expenses related to the Offer. The Offer expired in September 2020.