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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.

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