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Share-Based Compensation (Tables)
 12 Months Ended
Dec. 31, 2019
Share-based Payment Arrangement [Abstract]  
Summary of Stock Option Assumptions
The following weighted average assumptions were used to determine the fair value of the stock options granted on the original grant date for expense recognition purposes for options granted during December 31, 2019, 2018, and 2017 using a Black Scholes-Merton Model:
 
 201920182017
Director and Officers:   
Expected dividend yield$0.32  $0.26  $0.26  
Expected volatility29.54 %29.73 %30.81 %
Risk-free interest rate2.40 %2.20 %1.90 %
Expected life (in years)5.005.005.00
Employees:
Expected dividend yield$0.32  $0.26  $0.26  
Expected volatility29.54 %29.82 %30.67 %
Risk-free interest rate2.38 %2.51 %1.89 %
Expected life (in years)5.005.005.00
Summary of Stock Options Outstanding
The following is a summary of stock options vested and exercisable as of December 31, 2019:
 
Weighted
Average
Weighted
Range ofNumberRemainingAverage 
ExerciseofContractualExerciseIntrinsic
PricesSharesLifePriceValue
    (in thousands)
$7.18 - 34.10
451,077  5.44$23.47  $11,702  
$34.15 - 40.87
86,122  7.8236.33  1,126  
$41.37 - 50.68
1,750  1.8141.59  14  
Total538,949  5.81$25.58  $12,842  
 
The following is a summary of stock options vested and exercisable as of December 31, 2018:
 
Weighted
Average
Weighted
Range ofNumberRemainingAverage 
ExerciseofContractualExerciseIntrinsic
PricesSharesLifePriceValue
    (in thousands)
$5.67 - 32.80
456,223  5.72$20.25  $6,757  
$32.85 - 34.10
42,552  7.4733.95  47  
$34.15 - 42.94
17,202  8.3035.19  7  
Total515,977  5.95$21.88  $6,811  
The following is a summary of stock options vested and exercisable as of December 31, 2017:
 
Weighted
Average
Weighted
Range ofNumberRemainingAverage 
ExerciseofContractualExerciseIntrinsic
PricesSharesLifePriceValue
    (in thousands)
$4.54 - 22.76
424,130  4.36$12.41  $10,303  
$23.57 - 32.85
107,456  8.3130.10  709  
$32.90 - 37.30
25,725  9.1934.07  68  
Total557,311  5.35$16.82  $11,080  
Summary of Stock Option Activity
A summary of option activity under the plans is as follows:
Weighted
Average
Exercise
OptionsSharesPrice
Outstanding at December 31, 20182,445,849  $30.77  
Granted1,975,820  41.50  
Exercised(444,389) 28.40  
Forfeited or Expired(350,233) 36.78  
Outstanding at December 31, 20193,627,047  $36.32  
Exercisable at December 31, 2019538,949  $25.58  
Summary of Unvested Restricted Stock Awards
A summary of the unvested restricted stock awards is as follows:
Weighted
Average
Grant date
Restricted stockSharesFair Value
Unvested at December 31, 2018292,450  $28.54  
Granted113,018  40.98  
Vested(122,278) 26.38  
Forfeited(15,706) 34.71  
Unvested at December 31, 2019267,484  $34.42  
Summary of Grant Date Fair Value of Awards During Period
 201920182017
Grant date fair value of awards during the period:(in thousands)
Options$20,442  $12,932  $3,699  
Restricted stock4,631  3,609  4,217  
     Total$25,073  $16,541  $7,916  
Summary of Share-Based Compensation Expense
201920182017
Share-based compensation expense:(in thousands) 
Options$9,145  $5,344  $3,095  
Restricted stock2,654  2,518  3,218  
     Total$11,799  $7,862  $6,313  
Summary of Income Tax Benefit Related to Share-Based Compensation
201920182017
Income tax benefit related to share-based compensation:(in thousands) 
Options$1,197  $980  $1,413  
Restricted stock575  353  1,051  
     Total$1,772  $1,333  $2,464