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Supplemental balance sheet and cash flow information (other non-current assets) (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2020
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2020
Other non-current assets          
Postretirement benefit plan asset   $ 74,727     $ 71,208
Prepaid product discounts   54,109 $ 43,541 $ 51,145 50,602
Cloud computing arragements   47,508     29,242
Loans and notes receivable from distributors, net of allowances for uncollectible accounts [1]   26,858     35,068
Deferred contract acquisition costs [2]   16,171     9,199
Other   25,394     13,360
Other non-current assets   244,767     208,679
Loans and notes receivable, current   1,723     $ 2,008
Amortization of deferred sales commissions   2,276 1,817    
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]          
Accounting Standards Update [Extensible List] us-gaap:AccountingStandardsUpdate201613Member     us-gaap:AccountingStandardsUpdate201613Member  
Loans and notes receivable from distributors [Member]          
Loans and notes receivable from distributors, allowances for uncollectible accounts [Line Items]          
Balance, beginning of year $ 284 3,995 284    
Bad debt (benefit) expense   (658) 6,623    
Balance, end of period   3,337 11,656 $ 284  
Write-offs   0      
Recoveries   0      
Loans and notes receivable from distributors, credit quality information          
2020   1,283      
2019   3,168      
2018   14,359      
2017   11,708      
Prior   1,400      
Total   31,918      
Loans and notes receivable from distributors [Member] | 1-2 internal grade member [Member]          
Loans and notes receivable from distributors, credit quality information          
2020   1,283      
2019   569      
2018   14,359      
2017   11,708      
Prior   1,400      
Total   29,319      
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   $ 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 $1,723 as of June 30, 2021 and $2,008 as of December 31, 2020.
[2] Amortization of deferred contract acquisition costs was $2,276 for the six months ended June 30, 2021 and $1,817 for the six months ended June 30, 2020.