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4. Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2015
Dec. 31, 2014
Goodwill [Line Items]    
Goodwill $ 531,800 $ 528,600
Accumulated impairment loss (28,200) (28,200)
Goodwill, net 503,588 500,441
Currency fluctuations 3,200  
Life Science [Member]    
Goodwill [Line Items]    
Goodwill 207,500 207,700
Accumulated impairment loss (27,200) (27,200)
Goodwill, net 180,300 180,500
Currency fluctuations (200)  
Clinical Diagnostics [Member]    
Goodwill [Line Items]    
Goodwill 324,300 320,900
Accumulated impairment loss (1,000) (1,000)
Goodwill, net 323,300 $ 319,900
Currency fluctuations $ 3,400