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2. Acquisitions (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2022
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Aug. 03, 2022
Oct. 15, 2021
Business Acquisition [Line Items]              
Business Combination, Contingent Consideration, Liability [1]     $ 36,100        
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings [1]     (500)        
Goodwill   $ 347,343 406,488 $ 347,343 $ 291,900    
Goodwill, Acquired During Period     55,900 55,400      
Amortization expense     24,900 28,400 27,500    
Proceeds from Divestiture of a Division     1,360 0 12,240    
Gain on divestiture of a division     (1,400) 0 $ (11,700)    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability Value [1]   0 35,600 0      
Dropworks              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred   125,500          
Business Combination Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Assets             $ 5,600
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities             (19,500)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net             400
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets             70,100
Goodwill, Acquired During Period   55,400          
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net             125,500
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill             $ 83,600
Dropworks | Noncompete Agreements [Member]              
Business Acquisition [Line Items]              
Finite-lived Intangible Assets Acquired   $ 1,900          
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life   4 years 8 months 12 days          
Dropworks | Noncompete Agreements [Member] | Selling, General and Administrative Expenses [Member]              
Business Acquisition [Line Items]              
Amortization expense     400 $ 100      
Dropworks | In Process Research and Development [Member]              
Business Acquisition [Line Items]              
Finite-lived Intangible Assets Acquired   $ 81,700          
Curiosity Diagnostics              
Business Acquisition [Line Items]              
Business Combination, Consideration Transferred $ 137,100            
Business Combination, Contingent Consideration, Liability           $ 36,100  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Deferred Tax Liabilities           (18,800)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net           1,000  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets           81,200  
Goodwill, Acquired During Period 55,900            
Business Combination, Recognized Identifiable Assets Acquired, Goodwill, and Liabilities Assumed, Net           137,100  
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High     $ 70,000     70,000  
Payments to Acquire Businesses, Gross $ 101,000            
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill           $ 99,000  
[1] Contingent considerations in a liability position are included in Other long-term liabilities in the consolidated balance sheets.