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Pension Plans (Tables)
9 Months Ended
Sep. 30, 2015
Pension Plans [Abstract]  
Net Pension Costs
Net pension costs included the following components (in thousands):

  
SERP
  
Pension Plan
 
  
Three Months Ended
September 30,
  
Three Months Ended
September 30,
 
  
2015
  
2014
  
2015
  
2014
 
Service cost-benefits earned during period
 
$
32
  
$
31
  
$
N/
A
 
$
 
Interest cost on projected benefit obligations
  
79
   
73
       
881
 
Expected return on plan assets
  
   
       
(1,214
)
Amortization of prior service costs
  
52
   
53
       
 
Amortization of actuarial (gain) loss
  
42
   
       
79
 
Net pension costs
 
$
205
  
$
157
  
$
N/
A
 
$
(254
)

  
SERP
  
Pension Plan
 
  
Nine Months Ended
September 30,
  
Nine Months Ended
September 30,
 
  
2015
  
2014
  
2015
  
2014
 
Service cost-benefits earned during period
 
$
96
  
$
93
  
$
N/
A
 
$
 
Interest cost on projected benefit obligations
  
236
   
219
       
2,643
 
Expected return on plan assets
  
   
       
(3,642
)
Amortization of prior service costs
  
157
   
157
       
 
Amortization of actuarial (gain) loss
  
127
   
       
237
 
Net pension costs
 
$
616
  
$
469
  
$
N/
A
 
$
(762
)