Supplementary Information - Additional Information (Details) - USD ($) $ in Thousands		1 Months Ended		3 Months Ended		12 Months Ended
	Apr. 15, 2015	Apr. 30, 2015	Jul. 31, 2014	Dec. 31, 2014	Sep. 26, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Quarterly Financial Information [Line Items]
Proceeds from the sale of business, net of transaction costs						$ 29,570
Loss on disposal of discontinued operations, net of tax				$ (1,405)	$ (321)		$ (1,726)	$ (592)
Impairment of goodwill and intangible assets				$ 41,442			41,442
JK Lasers Business
Quarterly Financial Information [Line Items]
Proceeds from the sale of business, net of transaction costs	$ 29,600	$ 29,600
Loss on disposal of discontinued operations, net of tax	$ 19,600
NDS Acquisition
Quarterly Financial Information [Line Items]
Impairment of goodwill and intangible assets							41,400
Scientific Lasers Business
Quarterly Financial Information [Line Items]
Proceeds from the sale of business, net of transaction costs			$ 6,500
Loss on disposal of discontinued operations, net of tax							$ (1,700)