| **Earnings per Share**            | 6 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 June 30, For the Six Months Ended June 30, 2014 2013 2014 2013Weighted average common shares issued105,563,455 105,563,455 105,563,455 105,563,455Average treasury stock shares(11,584,636) (7,823,276) (11,232,622) (6,968,649)Average unearned nonvested shares(184,230) (175,480) (163,897) (172,850)Weighted average common shares and common stock equivalents used to calculate basic earnings per share93,794,589 97,564,699 94,166,936 98,421,956Additional common stock equivalents (nonvested stock) used to calculate diluted earnings per share16,954 12,311 10,895 7,267Additional 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 share93,811,543 97,577,010 94,177,831 98,429,223The 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 six months endedJune 30 because to do so would have been antidilutive. 2014 2013   Price Range   Price Range Shares From To Shares From ToStock Options15,000 $14.55 $14.55 40,210 $9.59 $14.55Restricted Stock93,268 5.96 9.18 92,059 5.96 7.35 |

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