2. Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2016	Dec. 31, 2016	Dec. 31, 2015	Jan. 06, 2016	Dec. 31, 2014
Business Acquisition [Line Items]
Goodwill		$ 477,115	$ 495,948		$ 500,400
Goodwill, Acquired During Period		100	$ 0
Analytical Flow Cytometer Platform [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 32,800
Payments to Acquire Businesses, Net of Cash Acquired	9,500
Business Combination, Contingent Consideration, Liability		$ 25,400		$ 23,300
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles				$ 32,700
Goodwill, Acquired During Period	$ 100