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Common Stock and Treasury Stock - Additional Information (Details) - USD ($) | 12 Months Ended | 34 Months Ended |
--- | --- | --- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2020 | Feb. 28, 2018
Equity [Abstract] |  |  |  |  |
Repurchase program, amount approved for repurchase |  |  |  |  | $ 200,000,000.0
Repurchase program, shares repurchased (in shares) | 1,000,000 | 1,228,102 | 2,346,427 | 46,357,495 |
Repurchase program, shares repurchased, value | $ 28,881,000 | $ 35,617,000 | $ 54,527,000 | $ 612,300,000 |
Repurchase program, maximum remaining amont authorized for purchase | $ 112,100,000 |  |  | $ 112,100,000 |

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