4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
Goodwill [Line Items]
Goodwill	$ 599,300	$ 599,300
Accumulated impairment loss	(335,200)	(335,200)
Goodwill, net	264,131	264,131
Goodwill, Acquired During Period	0
Life Science [Member]
Goodwill [Line Items]
Goodwill	250,100	250,100
Accumulated impairment loss	(41,800)	(41,800)
Goodwill, net	208,300	208,300
Goodwill, Acquired During Period	0
Clinical Diagnostics [Member]
Goodwill [Line Items]
Goodwill	349,200	349,200
Accumulated impairment loss	(293,400)	(293,400)
Goodwill, net	55,800	$ 55,800
Goodwill, Acquired During Period	$ 0