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Employee Benefit Plans (Tables)
9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Benefit Costs [Table Text Block]
The components of net periodic pension expense are as follows:
 
Three Months Ended September 30,
 
Nine Months Ended September 30,
 
2017

2016
 
2017
 
2016
Interest cost
$
543

 
$
572

 
$
1,627

 
$
1,714

Expected return on plan assets
(698
)
 
(698
)
 
(2,094
)
 
(2,092
)
Amortization of net loss
310

 
385

 
930

 
1,153

Total net periodic pension expense
$
155

 
$
259

 
$
463

 
$
775