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Capital Stock - Narrative (Details) - USD ($) | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Dec. 31, 2020
Capital Unit [Line Items] |  |  |
Preferred stock, par value (dollars per share) | $ 50,000 |  | $ 50,000
Cumulative preferred stock (percent) | 4.50% |  | 4.50%
Treasury stock, shares (shares) | 22,891,759 |  | 23,013,489
Treasury shares, at cost | $ 331,039,000 |  | $ 327,756,000
Common stock, shares authorized (shares) | 180,000,000 |  |
Common stock, par value (dollars per share) | $ 0 |  |
Common stock, shares, outstanding (shares) | 39,189,632 |  | 39,067,902
Cumulative Preferred Stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares authorized (shares) | 100,000 |  |
Preferred stock, par value (dollars per share) | $ 50 |  |
Cumulative preferred stock (percent) | 4.50% |  |
Preferred stock, callable price per share (dollars per share) | $ 52.50 |  |
Preferred stock, shares issued (shares) | 71,340 |  |
Treasury stock, shares (shares) | 52,998 |  |
Purchase of treasury shares (shares) | 0 | 120 |
Second Cumulative Preferred Voting Stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares authorized (shares) | 1,000,000 |  |
Preferred stock, par value (dollars per share) | $ 10 |  |
Preferred stock, shares issued (shares) | 0 |  |
Common Stock |  |  |
Capital Unit [Line Items] |  |  |
Purchase of treasury shares (shares) | 0 | 175,000 |
Common stock, shares issued (shares) |  |  | 62,081,391
Stock issued during period, new issues (shares) | 0 | 0 |
Common stock, value, issued (up to) | $ 100,000,000.0 |  |
Treasury stock |  |  |
Capital Unit [Line Items] |  |  |
Reissued shares (shares) | 33,625 | 63,405 |
Preferred Stock |  |  |
Capital Unit [Line Items] |  |  |
Treasury shares, at cost | $ 1,800,000 |  |

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