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Capital Stock (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Capital Unit [Line Items] |  |  |
Treasury stock, shares (shares) | 23,661,051 |  | 23,858,463
Common stock, shares authorized (shares) | 180,000,000 |  |
Common stock, par value (dollars per share) | $ 0 |  | $ 0
Common stock, shares, outstanding (shares) | 38,420,340 |  | 38,222,928
4 1/2% Cumulative Preferred Nonvoting 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 | 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) | 0 | 0 |
Common stock, shares issued (shares) |  |  | 62,081,391
Stock issued during period, new issues (shares) | 0 |  |
Common stock, value, issued | $ 100,000,000 |  |
Treasury Stock |  |  |
Capital Unit [Line Items] |  |  |
Reissued shares (shares) | 241,732 | 514,704 |

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