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Stockholders' Equity - Incentive and Other (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions | 9 Months Ended | 174 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Dec. 08, 2020 | Mar. 29, 2007
Share Repurchase Program |  |  |  |  |
Share repurchase | $ 25,531 | $ 18,777 |  |  |
Stock Repurchase Program 2007 |  |  |  |  |
Share Repurchase Program |  |  |  |  |
Number of shares of outstanding common stock authorized to be acquired under a stock repurchase program | 10.3 |  | 10.3 |  | 1.0
Additional number of shares authorized for repurchase |  |  |  | 0.7 |
Share repurchase (in shares) |  |  | 9.7 |  |
Average price (in dollars per share) | $ 73.69 |  | $ 21.57 |  |
Share repurchase | $ 25,500 |  |  |  |
Maximum | Stock Repurchase Program 2007 |  |  |  |  |
Share Repurchase Program |  |  |  |  |
Share repurchase (in shares) | 0.3 |  |  |  |

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