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4. Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2016
Dec. 31, 2015
Goodwill [Line Items]    
Goodwill $ 533,500 $ 524,100
Accumulated impairment loss (28,200) (28,200)
Goodwill, net 505,311 495,948
Goodwill, Acquired During Period 2,800  
Currency fluctuations 6,600  
Life Science [Member]    
Goodwill [Line Items]    
Goodwill 210,300 207,200
Accumulated impairment loss (27,200) (27,200)
Goodwill, net 183,100 180,000
Goodwill, Acquired During Period 2,800  
Currency fluctuations 300  
Clinical Diagnostics [Member]    
Goodwill [Line Items]    
Goodwill 323,200 316,900
Accumulated impairment loss (1,000) (1,000)
Goodwill, net 322,200 $ 315,900
Goodwill, Acquired During Period 0  
Currency fluctuations $ 6,300