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Common Stock and Treasury Stock - Additional Information (Details) - USD ($) | 3 Months Ended | 9 Months Ended | 178 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Feb. 28, 2018
Equity [Abstract] |  |  |  |  |
Amount approved for repurchase |  |  |  |  | $ 200,000,000.0
Shares repurchased (in shares) | 1,204,300 | 1,228,102 | 2,346,427 | 45,357,495 |
Shares repurchased, value | $ 34,986,000 | $ 35,617,000 | $ 54,527,000 | $ 583,400,000 |
Maximum remaining amount authorized for purchase | $ 141,000,000.0 | $ 141,000,000.0 |  | $ 141,000,000.0 |

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