13. Restructuring Costs (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended		8 Months Ended	19 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2020	Dec. 31, 2019
Restructuring Cost and Reserve [Line Items]
Cost of goods sold	$ 243,892	$ 264,850	$ 498,168	$ 507,067
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,200		2,200		$ 2,200	$ 2,200	$ 3,200
Restructuring Charges						4,000
Restructuring Reserve, Accrual Adjustment	0		0
Payments for Restructuring			(1,000)
European and North American Reorganization [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	9,800		9,800		9,800	9,800	25,300
Restructuring Charges					21,800
Restructuring Reserve, Accrual Adjustment	(1,100)		(3,500)
Payments for Restructuring			(11,900)
Restructuring Reserve, Foreign Currency Translation (Gain) Loss			(100)
European and North American Reorganization [Member] | Life Science [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	2,300		2,300		2,300	2,300	6,200
Restructuring Reserve, Accrual Adjustment			(400)
Payments for Restructuring			(3,500)
Restructuring Reserve, Foreign Currency Translation (Gain) Loss			0
European and North American Reorganization [Member] | Clinical Diagnostics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	7,500		7,500		7,500	7,500	19,100
Restructuring Reserve, Accrual Adjustment			(3,100)
Payments for Restructuring			(8,400)
Restructuring Reserve, Foreign Currency Translation (Gain) Loss			(100)
Finance and Administrative Reorganization
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	3,800		3,800		3,800	3,800	0
Restructuring Charges			3,800
Finance and Administrative Reorganization | Selling, General and Administrative Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges			3,800
Finance and Administrative Reorganization | Life Science [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,500		1,500		1,500	1,500	0
Restructuring Charges			1,500
Finance and Administrative Reorganization | Clinical Diagnostics [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 2,300		2,300		$ 2,300	$ 2,300	$ 0
Restructuring Charges			$ 2,300