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Share-Based Compensation (Tables)
 9 Months Ended
Sep. 30, 2018
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 and nine months ended September 30, 2018 and 2017:
    
 
 
Three Months Ended
 
Nine Months Ended
 
 
September 30,
 
September 30,
 
 
2018
 
2017
 
2018
 
2017
(in thousands)
 
 
 
 
 
 
 
 
Awards to non-employee directors
 
$
135

 
$
134

 
$
404

 
$
406

Awards to key employees
 
153

 
662

 
2,728

 
1,202

Total compensation expense
 
288

 
796

 
3,132

 
1,608

Less: tax benefit
 
(79
)
 
(320
)
 
(858
)
 
(647
)
Share-based compensation amounts included in net income
 
$
209

 
$
476

 
$
2,274

 
$
961
Awards to non-employee directors [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 non-employee directors for the nine months ended September 30, 2018: 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding—December 31, 2017
 
—

 
$
—

Granted
 
7,128

 
$
75.70

Vested
 
(7,128
)
 
$
75.70

Outstanding—September 30, 2018
 
—

 
$
—
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 nine months ended September 30, 2018: 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding—December 31, 2017
 
132,642

 
$
59.31

Granted
 
49,494

 
$
67.76

Vested
 
(29,786
)
 
$
47.39

Vested - Accelerated pursuant to separation agreement (1)
 
(16,676
)
 
$
75.78

Expired
 
(3,933
)
 
$
49.66

Outstanding—September 30, 2018
 
131,741

 
$
67.43