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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 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 six months ended June 30, 2018 and 2017:
    
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2018
 
2017
 
2018
 
2017
(in thousands)
 
 
 
 
 
 
 
 
Awards to non-employee directors
 
$
135

 
$
136

 
$
269

 
$
271

Awards to key employees
 
1,190

 
37

 
2,575

 
541

Total compensation expense
 
1,325

 
173

 
2,844

 
812

Less: tax benefit
 
(363
)
 
(70
)
 
(779
)
 
(327
)
Share-based compensation amounts included in net income
 
$
962

 
$
103

 
$
2,065

 
$
485
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 six months ended June 30, 2018: 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding—December 31, 2017
 
—

 
$
—

Granted
 
7,128

 
$
75.70

Vested
 
(7,128
)
 
$
75.70

Outstanding—June 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 six months ended June 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—June 30, 2018
 
131,741

 
$
67.46