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Capital Stock (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2015 | May. 12, 2015 | Dec. 31, 2014
Capital Unit [Line Items] |  |  |  |
Common Stock, shares authorized (shares) | 180,000,000 | 180,000,000 |  |
Common stock, par value (dollars per share) | $ 0 | $ 0 |  | $ 0
Common stock, shares, outstanding (shares) | 37,349,911 | 37,349,911 |  | 37,448,310
Treasury stock, shares acquired | 150,000 |  |  |
Treasury stock, shares | 24,731,480 | 24,731,480 |  | 24,633,081
Second Cumulative Preferred Voting Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Preferred stock, shares authorized | 1,000,000 | 1,000,000 |  |
Preferred stock, par value (dollars per share) | $ 10 | $ 10 |  |
Preferred stock, shares issued (shares) | 0 | 0 |  |
Treasury Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Reissued shares |  | 117,529 |  |
Board of Directors |  |  |  |
Capital Unit [Line Items] |  |  |  |
Common stock, value, issued |  |  | $ 100,000,000 |
4 1/2% Cumulative Preferred Nonvoting Stock |  |  |  |
Capital Unit [Line Items] |  |  |  |
Preferred stock, shares authorized | 100,000 | 100,000 |  |
Preferred stock, par value (dollars per share) | $ 50 | $ 50 |  |
Percentage of cumulative preferred stock | 4.50% | 4.50% |  |
Preferred stock, callable price per share (dollars per share) | $ 52.50 | $ 52.50 |  |
Preferred stock, shares issued (shares) | 71,373 | 71,373 |  |
Treasury share, number of shares held (shares) | 52,878 | 52,878 |  |
Purchase of treasury shares | $ 0 |  |  |

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