Property, Plant and Equipment (Tables)

12 Months Ended

Dec. 31, 2017

Property, Plant and Equipment [Abstract]

Property, Plant and Equipment [Table Text Block]

		2017		2016
Land	$	10,635	$	9,707
Building and improvements		87,111		80,740
Machinery and equipment		153,312		140,595
Construction in progress		4,932		4,964
		255,990		236,006
Less accumulated depreciation		(169,286)		(150,272)
	$	86,704	$	85,734