Inventories (Tables)

3 Months Ended

Mar. 31, 2019

Inventory Disclosure [Abstract]

Schedule of Inventory, Current [Table Text Block]

Inventories consisted of the following (in thousands): 

	March 31, 2019		December 31, 2018
Raw material	$	101,102	$	104,104
Work in process	57,337		52,909
Finished goods	163,308		154,150
Total inventories	$	321,747	$	311,163