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4. Goodwill and other Purchased Intangible Assets Intangible Assets, Goodwill and Other (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Goodwill [Roll Forward]    
Goodwill period start $ 528,600 $ 546,000
Accumulated impairment loss period start (28,200) (28,200)
Goodwill, net period start 500,441 517,800
Goodwill, Acquired During Period 0 13,500
Currency fluctuations (4,500) (30,900)
Goodwill period end 524,100 528,600
Accumulated impairment loss period end (28,200) (28,200)
Goodwill, net period end 495,948 500,441
Life Science [Member]    
Goodwill [Roll Forward]    
Goodwill period start 207,700 209,000
Accumulated impairment loss period start (27,200) (27,200)
Goodwill, net period start 180,500 181,800
Goodwill, Acquired During Period 0 0
Currency fluctuations (500) (1,300)
Goodwill period end 207,200 207,700
Accumulated impairment loss period end (27,200) (27,200)
Goodwill, net period end 180,000 180,500
Clinical Diagnostics [Member]    
Goodwill [Roll Forward]    
Goodwill period start 320,900 337,000
Accumulated impairment loss period start (1,000) (1,000)
Goodwill, net period start 319,900 336,000
Goodwill, Acquired During Period 0 13,500
Currency fluctuations (4,000) (29,600)
Goodwill period end 316,900 320,900
Accumulated impairment loss period end (1,000) (1,000)
Goodwill, net period end $ 315,900 $ 319,900