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Pension Plan (Tables)
3 Months Ended
Mar. 31, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of net benefit cost
Net periodic pension cost consists of the following: 

Three Months Ended March 31,
 
2016
 
2015

 
 


Service cost
$
113

 
$
67


 
 


Interest cost on projected benefit obligation
719

 
888


 
 


Expected return on plan assets
(1,297
)
 
(1,469
)

 
 


Net amortization and deferral
695

 
812


 
 


Net periodic pension cost
$
230

 
$
298