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Employee Benefit Plans (Tables)
3 Months Ended
Mar. 31, 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 March 31,
 
2017
 
2016
Interest cost
$
542

 
$
571

Expected return on plan assets
(698
)
 
(697
)
Amortization of net loss
310

 
384

Total net periodic pension expense
$
154

 
$
258