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Revenues - Narrative (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Revenue Recognition [Abstract]      
Fees to GPOs $ 3,400 $ 2,900  
Short-term deferred revenues, net 119,588   $ 100,053
Deferred cost of sales 20,800   21,000
Deferred revenues recognized 47,300    
Short-term deferred revenues, gross     121,100
Long-term deferred revenues $ 7,887   $ 5,673