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2. Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Feb. 15, 2017	Dec. 31, 2016
Business Acquisition [Line Items]
Goodwill, Purchase Accounting Adjustments			$ 0
Goodwill		$ 219,770	506,069		$ 477,100
Goodwill, Acquired During Period		0	$ 26,200
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, Acquired During Period	26,200
Business Combination, Consideration Transferred, Liabilities Incurred	$ 13,600
Analytical Flow Cytometer Platform [Member]
Business Acquisition [Line Items]
Business Combination, Contingent Consideration, Liability		$ 8,400
Deferred Tax Asset [Domain] | RainDance Technologies, Inc. [Member]
Business Acquisition [Line Items]
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net				$ 22,500

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Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

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