SUPPLEMENTAL BALANCE SHEET AND CASH FLOW INFORMATION (prepaid product discounts and accrued liabilities) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Changes in prepaid product discounts
Balance, beginning of year		$ 50,602	$ 51,145	$ 54,642
Additions	[1]	37,882	30,346	21,068
Amortization		(31,784)	(29,235)	(24,055)
Other		(173)	(1,654)	(510)
Balance, end of year		56,527	50,602	51,145
Prepaid product discount payments		40,920	33,613	$ 25,637
Accrued liabilities
Deferred revenue	[2]	52,645	42,104
Employee cash bonuses, including sales incentives		45,006	21,090
Operating lease liabilities (Note 15)		14,852	11,589
Prepaid product discounts due within one year		11,866	14,365
Customer rebates		9,036	8,179
Other		83,427	79,856
Accrued liabilities		216,832	$ 177,183
Recognition of deferred revenue		$ 39,366

[1] Prepaid product discounts are generally accrued upon contract execution. Cash payments made for prepaid product discounts were $40,920 for 2021, $33,613 for 2020 and $25,637 for 2019.

[2] $39,366 of the December 31, 2020 amount was recognized as revenue during 2021.