Revenue, Gross Profit and Operating Income (Loss) from Continuing Operations by Reportable Segment (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Segment Reporting Information [Line Items]
Revenue	$ 521,290	$ 384,758	$ 373,598
Gross Profit	220,531	162,452	157,890
Operating Income (Loss) from Continuing Operations	57,195	32,563	28,933
Photonics
Segment Reporting Information [Line Items]
Revenue	232,359	174,158	168,331
Gross Profit	106,117	76,696	73,602
Operating Income (Loss) from Continuing Operations	51,289	34,825	35,971
Vision
Segment Reporting Information [Line Items]
Revenue	183,074	122,250	124,725
Gross Profit	69,249	47,181	48,966
Operating Income (Loss) from Continuing Operations	7,883	(1,277)	(2,057)
Precision Motion
Segment Reporting Information [Line Items]
Revenue	105,857	88,350	80,542
Gross Profit	46,564	40,044	36,709
Operating Income (Loss) from Continuing Operations	27,146	21,101	16,877
Unallocated Corporate and Shared Services
Segment Reporting Information [Line Items]
Gross Profit	(1,399)	(1,469)	(1,387)
Operating Income (Loss) from Continuing Operations	$ (29,123)	$ (22,086)	$ (21,858)

Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1,2)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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