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Stockholders' Equity - Stock Repurchase Program (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Mar. 31, 2021 | Mar. 31, 2020 | Jun. 30, 2021 | Apr. 30, 2021 | Nov. 05, 2020
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Additional shares authorized for repurchase |  |  |  |  | 200,000,000 |
Value of shares repurchased | $ 105,786,000 | $ 145,806,000 | $ (29,203,000) |  |  |
Treasury stock at cost |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased |  |  |  | (17,949,000) |  |
Value of shares repurchased | $ 105,786,000 | $ 145,806,000 | $ (29,203,000) |  |  |
Common Class A |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Amount authorized to be repurchased |  |  |  |  | $ 500,000,000 |
Common Class A | Common Stock |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Number of shares repurchased | (7,548,000) | (10,401,000) | (1,619,000) |  |  |
Common Class A | Treasury stock at cost |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Amount authorized to be repurchased |  |  |  |  |  | $ 300,000
Treasury stock at cost |  |  |  |  |  |
Subsidiary, Sale of Stock [Line Items] |  |  |  |  |  |
Value of shares repurchased |  |  |  | $ (251,592,000) |  |

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