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3. Intangible Assets, Goodwill and Other (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Mar. 31, 2018	Jun. 30, 2018	Dec. 31, 2017
Goodwill [Line Items]
Goodwill		$ 553,200	$ 559,300
Accumulated impairment loss		(53,200)	(53,200)
Goodwill, net		500,022	506,069
Goodwill, Written off Related to Sale of Business Unit		(1,400)
Currency fluctuations		(4,700)
Life Science [Member]
Goodwill [Line Items]
Goodwill		234,500	234,700
Accumulated impairment loss		(35,900)	(35,900)
Goodwill, net		198,600	198,800
Goodwill, Written off Related to Sale of Business Unit		0
Currency fluctuations		(200)
Clinical Diagnostics [Member]
Goodwill [Line Items]
Goodwill		318,700	324,600
Accumulated impairment loss		(17,300)	(17,300)
Goodwill, net		301,400	$ 307,300
Goodwill, Written off Related to Sale of Business Unit	$ (1,400)	(1,400)
Currency fluctuations		$ (4,500)

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