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Stock-Based Compensation Plans (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Type
$ / shares
shares
Dec. 31, 2019
USD ($)
$ / shares
shares
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense, gross | $ $ 8,101 $ 6,917 $ 7,998
Restricted Stock and Performance Share Grants [Abstract]      
Number of types of restricted stock | Type 2    
Restricted Shares [Member] | Minimum [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Expiration of vesting period 3 years    
Restricted Shares [Member] | Employees [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Estimated forfeitures 5.00%    
Restricted Shares [Member] | Executives [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted Shares [Member] | Directors [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted Shares [Member] | Age 60 [Member] | Executives [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 25.00%    
Vesting period before reaching age limit 2 months    
Restricted Shares [Member] | Age 63 [Member] | Executives [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 25.00%    
Vesting period before reaching age limit 2 months    
Restricted Shares [Member] | Age 65 [Member] | Executives [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 100.00%    
Vesting period before reaching age limit 2 months    
Performance-Based Shares [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Measuring period for performance-based shares 3 years    
Restricted and performance-based stock, shares [Roll Forward]      
Forfeited (in shares) (50,250) (20,508)  
Performance-Based Shares [Member] | Minimum [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Expiration of vesting period 3 years    
Restricted and Performance-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense, gross | $ $ 7,800 $ 6,500 7,400
Stock-based compensation expense, net of tax | $ 5,800 4,900 $ 5,500
Restricted Stock and Performance Share Grants [Abstract]      
Unamortized compensation expense | $ $ 15,200 $ 15,900  
Restricted and performance-based stock, shares [Roll Forward]      
Beginning of period (in shares) 852,540 870,041  
Granted (in shares) 208,200 204,650  
Vested (in shares) (161,054) (188,693)  
Forfeited (in shares) [1] (60,000) (33,458)  
End of period (in shares) 839,686 852,540 870,041
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]      
Beginning of period (in dollars per share) | $ / shares $ 35.26 $ 34.59  
Granted (in dollars per share) | $ / shares 38.21 42.05  
Vested (in dollars per share) | $ / shares 39.23 38.08  
Forfeited (in dollars per share) | $ / shares 42.25 43.32  
End of period (in dollars per share) | $ / shares $ 34.77 $ 35.26 $ 34.59
Weighted-average grant date fair value | $ $ 29,200 $ 30,100 $ 30,100
Restricted and Performance-Based Shares [Member] | Employees [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Weighted average period of recognition for unrecognized compensation expense 4 years 7 months 6 days 4 years 7 months 6 days  
Restricted and Performance-Based Shares [Member] | Directors [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Weighted average period of recognition for unrecognized compensation expense 3 months 18 days 3 months 18 days  
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Holding period for restricted and performance shares issued 1 year    
Post vesting holding period for restricted and performance shares issued 1 year    
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Maximum [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Holding period for restricted and performance shares issued 2 years    
Post vesting holding period for restricted and performance shares issued 2 years    
2016 Omnibus Incentive Plan [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Shares authorized for issuance (in shares) 1,100,000    
2016 Omnibus Incentive Plan [Member] | Restricted Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 153,200    
2016 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 55,000    
2016 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Restricted and performance-based stock grants issued, net of forfeitures (in shares) 926,271    
Common stock available for future grants (in shares) 173,729    
[1] Due to the lack of achievement of performance targets, performance-based shares forfeited in the years ended December 31, 2020 and 2019 were 50,250 shares and 20,508 shares, respectively.