XML 26 R75.htm IDEA: XBRL DOCUMENT v3.19.3.a.u2
Stock-Based Compensation Plans (Details) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense $ 6,917 $ 7,998 $ 7,638
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]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 63 [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 25.00%    
Restricted Shares [Member] | Age 65 [Member]      
Restricted Stock and Performance Share Grants [Abstract]      
Vesting percentage 100.00%    
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) (20,508) (2,085)  
Restricted and Performance-Based Shares [Member]      
Share-based Compensation Arrangement by Share-based Payment Award [Abstract]      
Stock-based compensation expense $ 6,500 $ 7,400 7,100
Stock-based compensation expense, net of tax 4,900 5,500 $ 3,200
Restricted Stock and Performance Share Grants [Abstract]      
Unamortized compensation expense $ 15,900 $ 15,800  
Restricted and performance-based stock, shares [Roll Forward]      
Beginning of period (in shares) 870,041 853,958  
Granted (in shares) 204,650 198,004  
Vested (in shares) (188,693) (167,811)  
Forfeited (in shares) [1] (33,458) (14,110)  
End of period (in shares) 852,540 870,041 853,958
Restricted and performance-based stock, weighted average grant date fair value per share [Roll Forward]      
Beginning of period (in dollars per share) $ 34.59 $ 33.25  
Granted (in dollars per share) 42.05 39.36  
Vested (in dollars per share) 38.08 39.90  
Forfeited (in dollars per share) 43.32 42.28  
End of period (in dollars per share) $ 35.26 $ 34.59 $ 33.25
Weighted-average grant date fair value $ 30,100 $ 30,100 $ 28,400
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 3 months 18 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) 148,400    
2016 Omnibus Incentive Plan [Member] | Performance-Based Shares [Member]      
Restricted and performance-based stock, shares [Roll Forward]      
Granted (in shares) 56,250    
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) 778,071    
Common stock available for future grants (in shares) 321,929    
[1] Due to the lack of achievement of performance targets, performance-based shares forfeited in the years ended December 31, 2019 and 2018 were 20,508 shares and 2,085 shares, respectively.