Business Combinations Assets Acquired (Details) - USD ($) $ in Thousands				12 Months Ended
		May 13, 2017	Jul. 02, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	May 11, 2017	Jul. 01, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Separately Recognized Transactions, Expenses and Losses Recognized		$ (10,615)
Business Combination, Bargain Purchase, Gain Recognized, Amount				$ 9,309	$ 0	$ 0
Business Combination, Consideration Transferred			$ 244,300
Acquired rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Consideration Transferred			216,700
Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Consideration Transferred			23,900
LENSAR [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents							$ 1,983
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets							58,323
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment							18,647
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill	[1]						11,970
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets							25,723
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities							$ (6,673)
Business Combination, Bargain Purchase, Gain Recognized, Amount		(9,309)
Business Combination, Consideration Transferred		$ 31,726
Noden [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-lived Intangible Assets Acquired			3,735
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets								$ 244,305
Business Combination, Consideration Transferred			244,305
Noden [Member] | Acquired rights [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			216,690
Noden [Member] | Customer Relationships [Member]
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-lived Intangible Assets Acquired			$ 23,880

[1] (1) As of the effective date of the transaction, identifiable intangible assets are required to be measured at fair value. The fair value measurement is based on significant inputs that are unobservable in the market and thus represents a Level 3 measurement. The Company used an income approach to estimate the preliminary fair value of the intangibles which includes technology, trademarks and customer relationships. The assumptions used to estimate the cash flows of the business included a discount rate of 16%, estimated gross margins ranging from 37-72%, income tax rate of 35%, and operating expenses consisting of direct costs based on the anticipated level of revenues. The intangible assets have a weighted-average useful life of approximately 15.0 years. The intangible assets for acquired technology and trademarks are being amortized over their estimated useful lives using the straight-line method of amortization. The intangible assets for customer relationship are being amortized using a double-declining method of amortization as such method better represents the economic benefits to be obtained.