11. Segment Information Segment Asset Reconciliation (Details) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,177,116	$ 5,611,068
Operating Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,593,400	1,405,100
Other Current Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,103,600	1,047,200
Property, Plant and Equipment excluding segment specific [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	64,000	79,900
Goodwill [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	264,100	219,800
Other Noncurrent Assets [Member] | Segment Reconciling Items [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	4,152,000	2,859,100
Life Science [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	500,000	450,200
Clinical Diagnostics [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	1,085,600	949,000
Other Segments [Member]
Segment Reporting, Asset Reconciling Item [Line Items]
Assets	$ 7,800	$ 5,900