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Pension Plan (Tables)
6 Months Ended
Jun. 30, 2016
Compensation and Retirement Disclosure [Abstract]  
Schedule of net benefit cost
Net periodic pension cost consists of the following: 

Three Months Ended June 30,
 
Six Months Ended June 30,
 
2016
 
2015
 
2016
 
2015

 
 


 
 
 


Service cost
$
113

 
$
52

 
$
226

 
$
120


 
 


 
 
 


Interest cost on projected benefit obligation
719

 
810

 
1,438

 
1,697


 
 


 
 
 


Expected return on plan assets
(1,297
)
 
(1,380
)
 
(2,594
)
 
(2,849
)

 
 


 
 
 


Net amortization and deferral
695

 
805

 
1,390

 
1,617


 
 


 
 
 


Net periodic pension cost
$
230

 
$
287

 
$
460

 
$
585