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Retirement and Share-based Compensation Plans (Changes in Stock Options Outstanding) (Details) - USD ($) $ / shares in Units, $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Disclosure of Compensation Related Costs, Share-based Payments [Abstract] |  |  |  |
Outstanding, number of shares | 1,221,865 | 1,980,265 | 2,918,946 | 3,443,991
Outstanding, weighted-average exercise price per share | $ 17.41 | $ 16.20 | $ 16.06 | $ 15.17
Outstanding, total exercise price | $ 21,273 | $ 32,084 | $ 46,885 | $ 52,240
Granted, number of shares | 0 | 0 | 0 |
Granted, weighted-average exercise price per share | $ 0.00 | $ 0.00 | $ 0.00 |
Granted, total exercise price | $ 0 | $ 0 | $ 0 |
Canceled, number of shares | (40,850) | (57,200) | (24,700) |
Canceled, weighted-average exercise price per share | $ 18.87 | $ 13.66 | $ 14.83 |
Canceled, total exercise price | $ (771) | $ (781) | $ (366) |
Exercised, number of shares | (717,550) | (881,481) | (500,345) |
Exercised, weighted-average exercise price per share | $ 13.99 | $ 15.90 | $ 9.97 |
Exercised, total exercise price | $ (10,040) | $ (14,020) | $ (4,989) |
Stock Option Plans, 1996 Stock Option Plan, 2000 Employee Stock Option Plan, 2000 Directors Stock Option Plan, 2011 Directors Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 3,475,000 |  |  |
Duration of award | 10 years |  |  |
Stock Option Plans, 1996 Stock Option Plan, 2000 Employee Stock Option Plan, 2000 Directors Stock Option |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 6 months |  |  |
Stock Option Plans, 2011 Director Stock Option Plan |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Award vesting period | 3 years |  |  |
Number of shares available for future grant | 18,000 |  |  |
Stock Option Plans, Independent Insurance Agent Stock Option Plans |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Number of shares authorized | 8,000,000 |  |  |

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- Definition Total exercise price attributable to options granted in the period based upon the number of options granted and their weighted average exercise price. + References No definition available. + Details
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- Definition Total exercise price attributable to options exercised in the period based upon the number of options exercised and their weighted average exercise price. + References No definition available. + Details
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- Definition Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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