Accounts Receivable and Inventory by Reportable Segments (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Accounts Receivable
Total accounts receivable	$ 57,188	$ 51,494
Inventory
Total inventory	59,566	62,943
Total segment assets	116,754	114,437
Laser Products
Accounts Receivable
Total accounts receivable	21,763	24,083
Inventory
Total inventory	29,501	34,947
Vision Technologies
Accounts Receivable
Total accounts receivable	21,691	18,922
Inventory
Total inventory	19,583	19,596
Precision Motion
Accounts Receivable
Total accounts receivable	13,734	8,489
Inventory
Total inventory	$ 10,482	$ 8,400