11. Segment Information Segment Asset Reconciliation (Details) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,646,945	$ 5,611,068
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,621,500	1,405,100
Other Current Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,120,100	1,047,200
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	61,000	79,900
Goodwill [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	235,400	219,800
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,608,900	2,859,100
Life Science [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	508,900	450,200
Clinical Diagnostics [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,105,400	949,000
Other Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,200	$ 5,900