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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Feb. 15, 2017
Jan. 06, 2016
Dec. 31, 2015
Business Acquisition [Line Items]              
Goodwill     $ 506,069 $ 477,115     $ 495,900
Goodwill, Acquired During Period     26,200 $ 100      
RainDance Technologies, Inc. [Member]              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred $ 72,700            
Business Combination, Separately Recognized Transactions, Additional Disclosures, Acquisition Cost Expensed 10,000            
Payments to Acquire Businesses, Net of Cash Acquired 72,900            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles         $ 37,600    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         200    
Goodwill, Purchase Accounting Adjustments 1,900            
Goodwill, Acquired During Period 26,200            
Business Combination, Consideration Transferred, Liabilities Incurred 13,600            
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     $ 16,700     $ 23,300  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Finite-Lived Intangibles           $ 32,700  
Goodwill, Acquired During Period   $ 100          
Deferred Tax Asset [Domain] | RainDance Technologies, Inc. [Member]              
Business Acquisition [Line Items]              
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net         $ 22,500    
Goodwill, Purchase Accounting Adjustments 1,400            
Deferred Revenue [Domain] | RainDance Technologies, Inc. [Member]              
Business Acquisition [Line Items]              
Goodwill, Purchase Accounting Adjustments $ 3,300