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v3.21.2

Common Stock (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 237 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Dec. 31, 2020
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Common stock, outstanding | 53,747,352 |  | 53,747,352 |  | 53,747,352 | 54,755,900
Common stock, issued | 36,044 | 60,155 | 127,287 | 161,850 |  |
Common stock, dividend, per share |  |  | $ 0.13 |  |  |
Number of shares repurchased |  |  | 1,100,000 |  | 18,700,000 |
Stock repurchased (in US dollars) | $ 125,113,000 |  | $ 138,030,000 | $ 99,048,000 | $ 1,042,100,000 |
Remaining authorized repurchase amount (in US dollars) | 107,900,000 |  | 107,900,000 |  | 107,900,000 |
RepurchaseProgramSep2011toJun2021 |  |  |  |  |  |
Equity, Class of Treasury Stock [Line Items] |  |  |  |  |  |
Stock repurchase, authorized amount (in US dollars) | $ 1,150,000,000 |  | $ 1,150,000,000 |  | $ 1,150,000,000 |

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