| **Earnings per Share**            | 9 Months Ended                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                |
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| **Earnings Per Share [Abstract]** |                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                          |
| Earnings per Share                | Earnings per ShareThe following table summarizes the composition of the weighted-average common shares (denominator) used in the basic and diluted earnings per share computations: For the Three Months Ended September 30, For the Nine Months Ended September 30, 2015 2014 2015 2014Weighted average common shares issued105,563,455 105,563,455 105,563,455 105,563,455Average treasury stock shares(16,602,502) (12,836,692) (15,858,433) (11,773,187)Average unearned nonvested shares(153,659) (159,260) (177,462) (162,335)Weighted average common shares and common stock equivalents used to calculate basic earnings per share88,807,294 92,567,503 89,527,560 93,627,933Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share6,452 11,198 3,938 4,850Additional common stock equivalents (stock options) used to calculate diluted earnings per share— — — —Weighted average common shares and common stock equivalents used to calculate diluted earnings per share88,813,746 92,578,701 89,531,498 93,632,783The following table shows the number of shares and the price per share related to common stock equivalents that were not included in the computation of diluted earnings per share for the nine months endedSeptember 30 because to do so would have been antidilutive. 2015 2014   Price Range   Price Range Shares From To Shares From ToStock Options— $— $— 15,000 $14.55 $14.55Restricted Stock121,091 5.26 9.84 94,929 4.41 9.18 |

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| - Definition
The entire disclosure for earnings per share.
+ References
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