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4. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2019	Jun. 30, 2019	Mar. 04, 2019	Dec. 31, 2018
Goodwill [Line Items]
Goodwill		$ 570,600		$ 555,000
Accumulated impairment loss		(335,200)		(335,200)
Goodwill, net		235,401		219,770
Goodwill, Acquired During Period	$ 15,600	15,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill			$ 200
Life Science [Member]
Goodwill [Line Items]
Goodwill		250,100		234,500
Accumulated impairment loss		(41,800)		(41,800)
Goodwill, net		208,300		192,700
Goodwill, Acquired During Period		15,600
Clinical Diagnostics [Member]
Goodwill [Line Items]
Goodwill		320,500		320,500
Accumulated impairment loss		(293,400)		(293,400)
Goodwill, net		27,100		$ 27,100
Goodwill, Acquired During Period		$ 0

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- Definition

Amount of intangible assets, excluding goodwill, acquired at the acquisition date.

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