Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Schedule of Inventory, Current

Inventories at December 31 consisted of:

	2017		2016
Finished goods	$	79,649	$	71,100
Work-in-process	97,276		98,246
Raw materials and supplies	65,037		58,413
	$	241,962	$	227,759