Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	$ 414	$ 3,757
2011 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	389	1,287	1,584
Cumulative Costs	4,054
2011 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	(106)	1,042	386
Cumulative Costs	1,939
2011 Restructuring | Medical Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		48	0
Cumulative Costs	48
2011 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		5	52
Cumulative Costs	122
2011 Restructuring | Corporate, Shared Services and Unallocated costs
Restructuring Cost And Reserve [Line Items]
Restructuring Costs	495	192	1,146
Cumulative Costs	1,945
2012 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			1,758
2012 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			501
2012 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			951
2012 Restructuring | Corporate, Shared Services and Unallocated costs
Restructuring Cost And Reserve [Line Items]
Restructuring Costs			306
2013 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		2,463
2013 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		836
2013 Restructuring | Medical Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		806
2013 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		378
2013 Restructuring | Corporate, Shared Services and Unallocated costs
Restructuring Cost And Reserve [Line Items]
Restructuring Costs		$ 443