Operating Income from Continuing Operations by Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 26, 2014	Sep. 27, 2013	Sep. 26, 2014	Sep. 27, 2013
Operating Income
Operating Income	$ 6,822	$ 5,799	$ 17,370	$ 12,651
Laser Products
Operating Income
Operating Income	9,857	7,734	23,828	17,868
Medical Technologies
Operating Income
Operating Income	(1,115)	(469)	(1,194)	1,375
Precision Motion
Operating Income
Operating Income	2,796	3,223	9,525	9,657
Corporate, Shared Services and Unallocated
Operating Income
Operating Income	$ (4,716)	$ (4,689)	$ (14,789)	$ (16,249)