Quarterly report pursuant to Section 13 or 15(d)

Share-Based Payments - Stock Option Activity (Details)

v3.20.1
Share-Based Payments - Stock Option Activity (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Exercised (in shares)   (18)
Share-based compensation expense $ 3,266 $ 3,047
Employee Stock Option [Member]    
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Stock option grants expire (in years) 7 years  
Grants, vesting period (in years) 3 years  
Expected dividend yield (in hundredths) 1.10%  
Expected stock price volatility 24.10%  
Weighted Average Risk Free Interest Rate 1.50%  
Expected life of options (in years) 5 years 10 months 24 days  
Weighted-average fair value of options (dollars per share) $ 14.79  
Outstanding, beginning of period (in shares) 431  
Granted (in shares) 36  
Forfeited (in shares) (2)  
Outstanding, end of period (in shares) 465  
Exercisable, end of period (in shares) 330  
Outstanding, beginning of period (in dollars per share) $ 53  
Grants in Period (in dollars per share) 66  
Forfeited in period (in dollars per share) 60  
Outstanding, end of period (in dollars per share) 54  
Exercisable, end of period (in dollars per share) $ 51  
Aggregate Intrinsic Value Outstanding, end of period $ 3,017  
Aggregate Intrinsic Value Exercisable, end of period $ 3,364  
Weighted-average remaining contractual term Outstanding, end of period (in years) 4 years 1 month 6 days  
Weighted-average remaining contractual term Exercisable, end of period (in years) 3 years 6 months  
Share-based compensation expense $ 327 439
Tax benefit related to share-based expense 75 105
Unrecognized share-based compensation, net of estimated forfeitures $ 1,671 $ 2,768
Weighted average period over which unrecognized compensation will be recognized (years) 1 year 8 months 12 days