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Supplemental balance sheet and cash flow information (other non-current assets) (Details) - USD ($)
$ in Thousands
 9 Months Ended
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Other non-current assets        
Postretirement benefit plan asset   $ 76,435   $ 71,208
Cloud computing arragements   52,900   29,242
Prepaid product discounts $ 51,145 51,270 $ 41,249 50,602
Loans and notes receivable from distributors, net of allowances for uncollectible accounts [1]   20,424   35,068
Deferred contract acquisition costs [2]   17,480   9,199
Other   31,463   13,360
Other non-current assets   249,972   208,679
Loans and notes receivable, current   1,305   $ 2,008
Amortization of deferred contract acquisition costs   3,366 2,756  
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]        
Accounting Standards Update [Extensible List] Accounting Standards Update 2016-13 [Member]      
Loans and notes receivable from distributors [Member]        
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]        
Balance, beginning of year   3,995 284  
Bad debt (benefit) expense   (1,158) 5,647  
Exchange for customer lists     (6,402)  
Balance, end of period $ 284 2,837 4,278  
Write-offs   0    
Recoveries   0    
Loans and notes receivable from distributors, credit quality information        
2020   1,256    
2019   3,096    
2018   7,187    
2017   11,705    
Prior   1,322    
Total   24,566    
Loans and notes receivable from distributors [Member] | 1-2 internal grade member [Member]        
Loans and notes receivable from distributors, credit quality information        
2020   1,256    
2019   497    
2018   7,187    
2017   11,705    
Prior   1,322    
Total   21,967    
Loans and notes receivable from distributors [Member] | 3-4 internal grade [Member]        
Loans and notes receivable from distributors, credit quality information        
2020   0    
2019   2,599    
2018   0    
2017   0    
Prior   0    
Total   $ 2,599    
Loans and notes receivable from distributors [Member] | Adoption of Accounting Standards Update [Member]        
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]        
Balance, beginning of year     $ 4,749  
Balance, end of period $ 4,749      
[1] Amount Includes the non-current portion of loans and notes receivable. The current portion of these receivables is included in other current assets on the consolidated balance sheets and was $1,305 as of September 30, 2021 and $2,008 as of December 31, 2020.
[2] Amortization of deferred contract acquisition costs was $3,366 for the nine months ended September 30, 2021 and $2,756 for the nine months ended September 30, 2020.