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11. Segment Information Segment Asset Reconciliation (Details) - USD ($) $ in Thousands | Mar. 31, 2019 | Dec. 31, 2018
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Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 6,862,914 | $ 5,611,068
Operating Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 1,634,900 | 1,405,100
Other Current Assets [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 1,049,500 | 1,047,200
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 71,800 | 79,900
Goodwill [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 230,500 | 219,800
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 3,876,200 | 2,859,100
Life Science [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 503,700 | 450,200
Clinical Diagnostics [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | 1,123,800 | 949,000
Other Segments [Member] |  |
Segment Reporting, Asset Reconciling Item [Line Items] |  |
Assets | $ 7,400 | $ 5,900

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