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Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense $ 7,998 $ 7,638 $ 6,127
Restricted Shares [Member] | Employees [Member]      
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 5.00%    
Restricted Shares [Member] | Executives [Member]      
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted Shares [Member] | Directors [Member]      
Restricted and Performance Stock Grants [Abstract]      
Estimated forfeitures 0.00%    
Restricted Shares [Member] | Age 60 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 63 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 65 [Member]      
Restricted and Performance Stock Grants [Abstract]      
Vesting percentage 100.00%    
Performance-Based Shares [Member]      
Restricted and Performance Stock Grants [Abstract]      
Measuring period for performance-based shares 3 years    
Restricted and Performance-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense $ 7,400 7,100 5,700
Stock-based compensation expense, net of tax 5,500 3,200 $ 3,600
Unamortized compensation expense $ 15,800 $ 16,600  
Restricted and performance-based stock, shares [Roll Forward]      
Beginning of period (in shares) 853,958 822,848  
Granted (in shares) 198,004 207,975  
Vested (in shares) (169,896) (169,615)  
Forfeited (in shares) (12,025) (7,250)  
End of period (in shares) 870,041 853,958 822,848
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]      
Beginning of period (in dollars per share) $ 33.25 $ 30.46  
Granted (in dollars per share) 39.36 42.79  
Vested (in dollars per share) 39.92 31.26  
Forfeited (in dollars per share) 42.40 37.24  
End of period (in dollars per share) $ 34.59 $ 33.25 $ 30.46
Weighted-average grant date fair value $ 30,100 $ 28,400 $ 25,100
Restricted and Performance-Based Shares [Member] | Employees [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Weighted average period of recognition for unrecognized compensation expense 4 years 3 months 18 days 4 years 9 months 18 days  
Restricted and Performance-Based Shares [Member] | Directors [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [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]      
Restricted and Performance Stock Grants [Abstract]      
Expiration of vesting period 3 years    
Restricted and Performance-Based Shares [Member] | Executives and Directors [Member] | Minimum [Member]      
Restricted and Performance Stock 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 and Performance Stock 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) 144,504    
2016 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 53,500    
2016 Omnibus Incentive Plan [Member] | Restricted and Performance-Based Shares [Member]      
Restricted and Performance Stock Grants [Abstract]      
Restricted and performance-based stock grants issued, net of forfeitures (in shares) 606,879    
Common stock available for future grants (in shares) 493,121