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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