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11. Segment Information Segment Asset Reconciliation (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
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