Supplemental balance sheet and cash flow information (other non-current assets) (Details) - USD ($) $ in Thousands		6 Months Ended
		Jun. 30, 2024	Jun. 30, 2023	Dec. 31, 2023
Other non-current assets
Postretirement benefit plan asset		$ 99,163		$ 94,939
Cloud computing arrangements implementation costs		48,124		59,234
Prepaid product discounts	[1]	41,390		40,376
Deferred contract acquisition costs	[2]	20,513		21,103
Loans and notes receivable from distributors, net of allowance for credit losses	[3]	12,081		12,443
Other		30,074		23,087
Other non-current assets		251,345		251,182
Amortization of prepaid product discounts		16,354	$ 17,173
Amortization of deferred contract acquisition costs		6,298	5,315
Loans and notes receivable, current		1,501		$ 987
Loans and notes receivable from distributors [Member]
Loans and notes receivable from distributors, allowance for credit losses [Line Items]
Balance, beginning of year		928	1,024
Bad debt expense (benefit)		217	(73)
Balance, end of period		1,145	$ 951
Write-offs		0
Recoveries		0
Loans and notes receivable from distributors, credit quality information
2024		967
2023		341
2020		928
2019		340
Prior		12,151
Total		14,727
Loans and notes receivable from distributors [Member] | 1-2 internal grade member [Member]
Loans and notes receivable from distributors, credit quality information
2024		967
2023		341
2020		928
2019		340
Prior		11,448
Total		14,024
Loans and notes receivable from distributors [Member] | 3-4 internal grade [Member]
Loans and notes receivable from distributors, credit quality information
2024		0
2023		0
2020		0
2019		0
Prior		703
Total		$ 703

[1] Amortization of prepaid product discounts was $16,354 for the six months ended June 30, 2024 and $17,173 for the six months ended June 30, 2023.

[2] Amortization of deferred contract acquisition costs was $6,298 for the six months ended June 30, 2024 and $5,315 for the six months ended June 30, 2023.

[3] 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 $1,501 as of June 30, 2024 and $987 as of December 31, 2023.