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Stockholders' Equity	12 Months Ended
Stockholders' Equity	Dec. 31, 2020
Equity [Abstract]
Stockholders' Equity	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. As of December 31, 2020 and 2019, no shares of preferred stock have been issued. Our board of directors is authorized to issue up to 525,000,000 shares of Class A common stock, $0.01 par value per share (common stock), of which 335,561,345 shares and 334,752,283 shares were issued and outstanding as of December 31, 2020 and 2019, respectively. Stock Repurchase Program In 2016, our board of directors authorized the company to repurchase up to an aggregate of $250.0 million of our common stock over three years. During the year ended December 31, 2019, we spent $45.1 million to repurchase 1,144,449 shares of our common stock at an average price of $39.38 per share using cash on hand. During the year ended December 31, 2018, we spent $161.0 million to repurchase 3,980,656 shares of our common stock at an average price of $40.43 per share using cash on hand. This repurchase program terminated upon the effectiveness of the new program that took effect in March 2019. In February 2019, our board of directors authorized a new program for the repurchase up to $300.0 million of our common stock over three years, effective March 11, 2019. In both August and November 2019, our board of directors authorized an additional $100.0 million under the new program, bringing the total authorized repurchase amount under the program to a total of $500.0 million. During the year ended December 31, 2020, we spent $50.0 million to repurchase 1,050,084 shares of our common stock at an average price of $47.62 per share using cash on hand. During the year ended December 31, 2019, we spent $100.0 million to repurchase 1,936,458 shares of our common stock at an average price of $51.64 per share using cash on hand. Our share repurchase program does not obligate us to acquire any specific number of shares. Under this program, shares may be repurchased in privately negotiated and/or open market transactions, including under plans complying with Rule 10b5-1 under the Securities Exchange Act of 1934. Our stock repurchases have been funded with cash on hand and we intend to continue funding future repurchases with existing cash. We may utilize our stock repurchase program to continue offsetting the impact of our stock-based compensation program and on a more opportunistic basis if we believe our stock presents a compelling investment compared to other discretionary uses. The timing of any future repurchases and the actual amounts repurchased will depend on a variety of factors, including the market price of our common stock, general market and economic conditions and other factors. As of December 31, 2020, we had $350.0 million of capacity remaining under our repurchase program.