Inventories (Tables)

12 Months Ended

Dec. 31, 2017

Inventory Disclosure [Abstract]

Inventories

Inventories consist of the following (in thousands):

	December 31,
	2017		2016
Raw material and subassemblies	$	210,615	$	200,640
Work-in-progress	47,400		43,430
Finished goods	114,168		127,301
	$	372,183	$	371,371