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Share-Based Compensation (Tables)
 6 Months Ended
Jun. 30, 2017
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, 2017 and 2016:
 
 
 
Three Months Ended
 
Six Months Ended
 
 
June 30,
 
June 30,
 
 
2017
 
2016
 
2017
 
2016
(in thousands)
 
 
 
 
 
 
 
 
Awards to non-employee directors
 
$
136

 
$
145

 
$
271

 
$
310

Awards to key employees
 
37

 
470

 
541

 
954

Total compensation expense
 
173

 
615

 
812

 
1,264

Less: tax benefit
 
(70
)
 
(248
)
 
(327
)
 
(509
)
Share-based compensation amounts included in net income
 
$
103

 
$
367

 
$
485

 
$
755
Schedule of Share-based Compensation, Nonemployee Director Stock Award Plan, Activity [Table Text Block]
A summary of the stock activity for our non-employee directors during the six months ended June 30, 2017 is presented below:
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding— December 31, 2016
 
—

 
$
—

Granted
 
7,515

 
$
71.80

Vested
 
(7,515
)
 
$
71.80

Outstanding— June 30, 2017
 
—

 
$
—
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, 2017:
 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding— December 31, 2016
 
115,091

 
$
51.85

Granted
 
52,355

 
$
67.47

Vested
 
(32,926
)
 
$
38.88

Expired
 
(1,878
)
 
$
39.97

Outstanding— June 30, 2017
 
132,642

 
$
54.13