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Capital Stock (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Capital Unit [Line Items] |  |
Treasury stock, shares (shares) | 23,897,881 | 24,344,813
Common stock, shares authorized (shares) | 180,000,000 |
Common stock, par value (dollars per share) | $ 0 | $ 0
Common stock, shares, outstanding (shares) | 38,183,510 | 37,736,578
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 |
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 |
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) | 514,704 |

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