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Supplemental balance sheet and cash flow information (other) (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Dec. 31, 2019
Prepaid product discounts [Roll Forward]        
Balance, beginning of year $ 50,602 $ 51,145    
Additions [1] 7,890 2,470    
Amortization (7,440) (7,077)    
Other (8) (544)    
Balance, end of period 51,044 45,994    
Prepaid product discount payments 9,590 7,321    
Accrued liabilities        
Deferred revenue [2] 49,469   $ 42,104  
Employee cash bonuses, including sales incentives 17,005   21,090  
Prepaid product discounts due within one year 12,640   14,365  
Operating lease liabilities 10,914   11,589  
Customer rebates 7,046   8,179  
Other 77,849   79,856  
Accrued liabilities 174,923   177,183  
Deferred revenue recognized 16,121      
Supplemental cash flow information        
Cash and cash equivalents 125,440 310,146 123,122  
Total cash, cash equivalents, restricted cash and restricted cash equivalents 234,515 385,803 $ 229,409 $ 174,811
Funds held for customers [Member]        
Supplemental cash flow information        
Restricted cash and restricted cash equivalents included in funds held for customers $ 109,075 $ 75,657    
[1] Prepaid product discounts are generally accrued upon contract execution. Cash payments for prepaid product discounts were $9,590 for the quarter ended March 31, 2021 and $7,321 for the quarter ended March 31, 2020.
[2] $16,121 of the December 31, 2020 amount was recognized as revenue during the quarter ended March 31, 2021.