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14. Segment Reporting (Details)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Segment Reporting Information [Line Items]      
Number Of Products And Services 9,000    
Net sales $ 2,289,400 $ 2,160,200 $ 2,068,200
Interest expense 23,962 23,014 23,380
Depreciation and amortization 138,100 148,700 142,900
Segment profit (103,341) 119,250 55,718
Total assets 5,611,068 4,273,012  
Payments to Acquire Property, Plant, and Equipment 129,825 111,332 141,436
Life Science [Member]      
Segment Reporting Information [Line Items]      
Net sales 861,700 785,200 730,700
Interest expense 7,200 7,000 6,900
Depreciation and amortization 34,100 36,200 31,700
Segment profit 28,700 (9,900) (19,100)
Total assets 450,200 453,000  
Payments to Acquire Property, Plant, and Equipment 36,700 12,600  
Clinical Diagnostics [Member]      
Segment Reporting Information [Line Items]      
Net sales 1,411,800 1,360,800 1,323,300
Interest expense 16,700 14,900 16,500
Depreciation and amortization 72,000 80,200 80,500
Segment profit (145,700) 114,800 58,000
Total assets 949,000 1,038,400  
Payments to Acquire Property, Plant, and Equipment 60,500 59,000  
All Other Segments [Member]      
Segment Reporting Information [Line Items]      
Net sales 15,900 14,200 14,200
Interest expense 100 0 0
Depreciation and amortization 500 0 0
Segment profit 200 1,400 $ 900
Total assets 5,900 4,800  
Payments to Acquire Property, Plant, and Equipment $ 500 $ 0