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Share-Based Compensation (Tables)
 3 Months Ended
Mar. 31, 2015
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 [Table Text Block]
The table below presents the amounts included in net income related to share-based compensation expense for the three months ended March 31, 2015 and 2014:
 
 
 
Three Months Ended
 
 
March 31,
 
 
2015
 
2014
(in thousands)
 
 
 
 
Awards to non-employee directors
 
$
150

 
$
124

Awards to key employees
 
387

 
514

Total compensation expense
 
537

 
638

Less: tax benefit
 
(217
)
 
(257
)
Share-based compensation amounts included in net income
 
$
320

 
$
381
Awards to non-employee directors [Member]  
Shares awarded to non-employee directors [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
Award to key employees [Member]  
Shares awarded to non-employee directors [Line Items]  
Schedule of Share-based Compensation, Activity [Table Text Block]
The table below presents the summary of the stock activity for awards to key employees for the three months ended March 31, 2015:
 
 
 
Number of Shares
 
Weighted Average
Fair Value
Outstanding—December 31, 2014
 
123,038

 
$
32.60

Granted
 
29,763

 
$
48.90

Vested
 
(43,839
)
 
$
28.01

Expired
 
(2,520
)
 
$
28.83

Outstanding—March 31, 2015
 
106,442

 
$
38.17