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Pension Plan (Tables)
 9 Months Ended
Sep. 30, 2014
Compensation and Retirement Disclosure [Abstract]  
Schedule of net benefit cost
Net periodic pension (income) costs consist of the following: 

Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2013
 
2014
 
2013
 
2014



 


 


 


Service cost
$
69

 
$
68

 
$
208

 
$
203




 


 


 


Interest cost on projected benefit obligation
785

 
866

 
2,356

 
2,599




 


 


 


Expected return on plan assets
(1,302
)
 
(1,496
)
 
(3,907
)
 
(4,489
)



 


 


 


Net amortization and deferral
732

 
410

 
2,195

 
1,230




 


 


 


Net periodic pension (income) cost
$
284

 
$
(152
)
 
$
852

 
$
(457
)