Depreciation and Amortization by Reportable Segments (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Apr. 03, 2015	Mar. 28, 2014
Depreciation and Amortization
Depreciation and Amortization	$ 4,762	$ 4,829
Laser Products
Depreciation and Amortization
Depreciation and Amortization	1,582	1,666
Medical Technologies
Depreciation and Amortization
Depreciation and Amortization	2,258	2,091
Precision Motion
Depreciation and Amortization
Depreciation and Amortization	473	502
Corporate, Shared Services and Unallocated
Depreciation and Amortization
Depreciation and Amortization	$ 449	$ 570