Inventories (Tables)

3 Months Ended

Mar. 31, 2017

Inventories [Abstract]

Schedule of Inventory [Table Text Block]

		March 31,		December 31,
		2017		2016
Finished goods	$	44,970	$	46,673
Work-in-process		22,449		21,716
Raw materials		18,299		18,032
Total inventories at current costs		85,718		86,421
Less: LIFO reserve		(3,167)		(3,178)
	$	82,551	$	83,243