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Capital Stock - Narrative (Details) - USD ($) | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018
Capital Unit [Line Items] |  |  |
Treasury stock, shares (shares) | 23,343,500 |  | 23,554,868
Treasury shares, at cost | $ 305,092,000 |  | $ 298,143,000
Common stock, shares authorized (shares) | 180,000,000 |  |
Common stock, par value (dollars per share) | $ 0 |  | $ 0
Common stock, shares, outstanding (shares) | 38,737,891 |  | 38,526,523
Cumulative Preferred Stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, shares authorized (shares) | 100,000 |  |
Preferred stock, par value (dollars per share) | $ 50 |  |
Percentage of 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) | 52,878 |  |
Purchase of treasury shares (shares) | 0 |  |
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) | 33,465 | 0 |
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) | 320,718 | 290,659 |
Preferred Stock |  |  |
Capital Unit [Line Items] |  |  |
Preferred stock, par value (dollars per share) | $ 50 |  | $ 50
Percentage of cumulative preferred stock (percent) | 4.50% |  | 4.50%
Treasury shares, at cost | $ 1,800,000 |  |

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