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Supplemental balance sheet and cash flow information (other non-current assets) (Details) - USD ($) $ in Thousands | 6 Months Ended |  |
--- | --- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021 | Dec. 31, 2020
Other non-current assets |  |  |  |  |
Postretirement benefit plan asset |  | $ 90,639 |  | $ 87,019 |
Cloud computing arrangements implementation costs |  | 69,008 |  | 63,806 |
Prepaid product discounts |  | 48,683 | $ 54,109 | 56,527 | $ 50,602
Deferred contract acquisition costs | [1] | 21,018 |  | 17,975 |
Loans and notes receivable from distributors, net of allowance for credit losses | [2] | 14,602 |  | 20,201 |
Other |  | 28,397 |  | 33,935 |
Other non-current assets |  | 272,347 |  | 279,463 |
Amortization of deferred contract acquisition costs |  | 3,767 | 2,276 |  |
Loans and notes receivable, current |  | 1,059 |  | $ 1,317 |
Loans and notes receivable from distributors [Member] |  |  |  |  |
Loans and notes receivable from distributors, allowance for credit losses [Line Items] |  |  |  |  |
Balance, beginning of year |  | 2,830 | 3,995 |  |
Bad debt expense (benefit) |  | 264 | (658) |  |
Exchange for customer lists |  | (402) | 0 |  |
Balance, end of period |  | 2,692 | $ 3,337 |  |
Write-offs |  | 0 |  |  |
Recoveries |  | 0 |  |  |
Loans and notes receivable from distributors, credit quality information |  |  |  |  |
2020 |  | 1,203 |  |  |
2019 |  | 3,056 |  |  |
2018 |  | 4,394 |  |  |
2017 |  | 8,649 |  |  |
Prior |  | 1,051 |  |  |
Total |  | 18,353 |  |  |
Loans and notes receivable from distributors [Member] | 1-2 internal grade member [Member] |  |  |  |  |
Loans and notes receivable from distributors, credit quality information |  |  |  |  |
2020 |  | 1,203 |  |  |
2019 |  | 457 |  |  |
2018 |  | 4,394 |  |  |
2017 |  | 8,649 |  |  |
Prior |  | 1,051 |  |  |
Total |  | 15,754 |  |  |
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 |  |  |
[1] | Amortization of deferred contract acquisition costs was $3,767 for the six months ended June 30, 2022 and $2,276 for the six months ended June 30, 2021.
[2] | 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 $1,059 as of June 30, 2022 and $1,317 as of December 31, 2021.

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