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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2016
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, 2016 and 2015:
 
 
 
Three Months Ended
 
 
March 31,
 
 
2016
 
2015
(in thousands)
 
 
 
 
Awards to non-employee directors
 
$
165

 
$
150

Awards to key employees
 
484

 
387

Total compensation expense
 
649

 
537

Less: tax benefit
 
(261
)
 
(217
)
Share-based compensation amounts included in net income
 
$
388

 
$
320
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, 2016:
 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding— December 31, 2015
 
110,398

 
$
38.34

Granted
 
46,571

 
$
61.50

Vested
 
(39,553
)
 
$
31.79

Expired
 
(2,325
)
 
$
42.25

Outstanding— March 31, 2016
 
115,091

 
$
49.26