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Pension Plans (Tables)
3 Months Ended
Mar. 31, 2015
Pension Plans [Abstract]  
Net Pension Costs
Net pension costs included the following components (in thousands):

  
SERP
  
Pension Plan
 
  
Three Months Ended
March 31,
  
Three Months Ended
March 31,
 
  
2015
  
2014
  
2015
  
2014
 
Service cost-benefits earned during period
 $
  
$
  
$
N/A
 
 
$
31
 
Interest cost on projected benefit obligations
   —
 
  
       
954
 
Expected return on plan assets
  
   
       
(1,214
)
Amortization of prior service costs
  
52
   
52
       
 
Amortization of actuarial (gain) loss
  
29
   
       
79
 
Net pension costs
 
$
81
  
$
52
  
$
N/A
 
 
$
(150
)