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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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