Summary of Restructuring Costs for Each Segment and Unallocated Corporate Costs (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Cost And Reserve [Line Items]
Restructuring charges	$ 5,840	$ 414	$ 3,757
2016 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges	3,148
2016 Restructuring | Minimum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	4,500
2016 Restructuring | Maximum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	5,500
2016 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring charges	55
2016 Restructuring | Laser Products | Minimum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	300
2016 Restructuring | Laser Products | Maximum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	400
2016 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring charges	2,200
2016 Restructuring | Vision Technologies | Minimum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	3,200
2016 Restructuring | Vision Technologies | Maximum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	3,700
2016 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring charges	833
2016 Restructuring | Precision Motion | Minimum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	700
2016 Restructuring | Precision Motion | Maximum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	1,000
2016 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges	60
2016 Restructuring | Unallocated Corporate and Shared Services | Minimum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	300
2016 Restructuring | Unallocated Corporate and Shared Services | Maximum
Restructuring Cost And Reserve [Line Items]
Expected Cumulative Costs	400
2015 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,484
2015 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring charges	542
2015 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring charges	525
2015 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring charges	79
2015 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges	338
2013 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges		25	2,463
2013 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring charges			836
2013 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring charges			806
2013 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring charges			378
2013 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges			443
2011 Restructuring
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,208	389	1,287
Cumulative Costs	5,262
2011 Restructuring | Laser Products
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0		1,042
Restructuring charges reversal		(106)
Cumulative Costs	1,939
2011 Restructuring | Vision Technologies
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	48
Cumulative Costs	48
2011 Restructuring | Precision Motion
Restructuring Cost And Reserve [Line Items]
Restructuring charges	0	0	5
Cumulative Costs	122
2011 Restructuring | Unallocated Corporate and Shared Services
Restructuring Cost And Reserve [Line Items]
Restructuring charges	1,208	$ 495	$ 192
Cumulative Costs	$ 3,153