Depreciation and Amortization 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
Depreciation and Amortization
Depreciation and Amortization	$ 6,344	$ 4,785	$ 17,495	$ 14,792
Laser Products
Depreciation and Amortization
Depreciation and Amortization	1,618	1,701	4,838	4,735
Medical Technologies
Depreciation and Amortization
Depreciation and Amortization	3,745	2,143	9,552	6,762
Precision Motion
Depreciation and Amortization
Depreciation and Amortization	444	486	1,451	1,471
Corporate, Shared Services and Unallocated
Depreciation and Amortization
Depreciation and Amortization	$ 537	$ 455	$ 1,654	$ 1,824