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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

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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6578-128477 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=35744584&loc=d3e6927-128479 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=6911251&loc=d3e6613-128477 + Details
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