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Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions |  |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2020 | May 09, 2018 | Dec. 31, 2020 | Oct. 31, 2020 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Jul. 09, 2020
Equity [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Common stock issued (in shares) |  |  | 13.0 | 9.6 |  |  |  |  |  |  |  |  |  |  |  |
Common stock, par value (in dollars per share) | $ 0.01 |  | $ 0.01 | $ 0.01 | $ 0.01 |  |  |  | $ 0.01 |  |  |  | $ 0.01 | $ 0.01 |  | $ 0.01
Common stock, price per share (in dollars per share) | $ 76.65 |  | $ 76.65 | $ 60.00 | 76.65 |  |  |  |  |  |  |  | 76.65 |  |  |
Proceeds from sale of stock | $ 868,600 |  | $ 994,600 | $ 557,400 |  |  |  |  |  |  |  |  |  |  |  |
Common stock dividends declared (in dollars per share) |  |  |  |  | $ 0 | $ 0 | $ 0 | $ 0.78 | 0.78 | $ 0.78 | $ 0.70 | $ 0.70 | $ 0.78 | $ 2.96 | $ 2.60 |
Common stock, dividends paid (in dollars per share) |  |  |  |  |  |  | $ 0.78 | $ 0.78 | $ 0.78 | $ 0.70 | $ 0.70 |  |  |  |  |
Term of stock repurchase program |  | 24 months |  |  |  |  |  |  |  |  |  |  |  |  |  |
Treasury stock, shares acquired (in shares) |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.9 |  |
Total cost of treasury stock, acquired during the period |  |  |  |  |  |  |  |  |  |  |  |  | $ 0 | $ 99,582 | $ 575,039 |

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