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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2015
Benefit Plans [Abstract]  
Components of Company's net periodic cost
The table below outlines the components of the Company's net periodic benefit recognized during the three and nine months ended September 30, 2015 and 2014 for its pension and other postretirement benefit plans:
 
  
For the three months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
 
2015
  
2014
  
2015
  
2014
 
             
Service cost
 
$
15
   
8
   
47
   
46
 
Interest cost
  
337
   
359
   
72
   
99
 
Expected return on plan assets
  
(684
)
  
(660
)
  
(182
)
  
(166
)
Amortization of net loss (gain)
  
77
   
-
   
(34
)
  
(77
)
Amortization of prior service cost (credit)
  
-
   
-
   
23
   
239
 
Net periodic benefit
 
$
(255
)
  
(293
)
  
(74
)
  
141
 
 
  
For the nine months ended September 30,
 
  
Pension Benefits
  
Other Postretirement Benefits
 
(dollars in thousands)
  
2015
   
2014
   
2015
   
2014
 
                 
Service cost
 
$
45
   
44
   
125
   
75
 
Interest cost
  
997
   
1,031
   
201
   
163
 
Expected return on plan assets
  
(2,052
)
  
(1,878
)
  
(543
)
  
(504
)
Amortization of net loss (gain)
  
158
   
-
   
(105
)
  
(223
)
Amortization of prior service cost (credit)
  
-
   
-
   
68
   
149
 
Net periodic benefit
 
$
(852
)
  
(803
)
  
(254
)
  
(340
)