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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Jan. 06, 2016
Dec. 31, 2015
Apr. 10, 2014
Business Acquisition [Line Items]        
Goodwill $ 509,582   $ 495,948  
Goodwill, Acquired During Period 2,800      
Analytical Flow Cytometer Platform [Member]        
Business Acquisition [Line Items]        
Business Combination, Consideration Transferred 38,800      
Business Combination, Contingent Consideration, Liability 29,300 $ 29,300    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles   $ 36,000    
Payments to Acquire Businesses, Net of Cash Acquired 9,500      
Goodwill, Acquired During Period 2,800      
GnuBIO [Member]        
Business Acquisition [Line Items]        
Business Combination, Contingent Consideration, Liability $ 10,000     $ 10,700