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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2019
Shares awarded to non-employee directors [Line Items]  
Schedule of Compensation Cost for Share-based Payment Arrangements, Allocation of Share-based Compensation Costs by Plan
The table below presents the amounts included in net income related to share-based compensation expense for the three months ended March 31, 2019 and 2018:
    
 
 
Three Months Ended
 
 
March 31,
 
 
2019
 
2018
(in thousands)
 
 
 
 
Awards to non-employee directors
 
$
149

 
$
135

Awards to key employees
 
338

 
1,385

Total compensation expense
 
487

 
1,520

Less: tax benefit
 
(127
)
 
(416
)
Share-based compensation amounts included in net income
 
$
360

 
$
1,104
Awards to non-employee directors [Member]  
Shares awarded to non-employee directors [Line Items]  
Schedule of Share-based Compensation, Activity
.
Award to key employees [Member]  
Shares awarded to non-employee directors [Line Items]  
Schedule of Share-based Compensation, Activity
The table below presents the summary of the stock activity for awards to key employees for the three months ended March 31, 2019: 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding—December 31, 2018
 
131,741

 
$
67.24

Granted
 
45,016

 
$
91.19

Vested
 
(25,831
)
 
$
67.08

Expired
 
(15,086
)
 
$
69.28

Outstanding—March 31, 2019
 
135,840

 
$
74.05