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Revenue - Allowance for Doubtful Accounts (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2021
Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]    
Allowance for doubtful accounts, balance at beginning of period $ 19,782 $ 8,171
Bad debt expense 10,048 20,633
Actual write-offs (7,061) (9,022)
Allowance for doubtful accounts, balance at end of period $ 22,769 $ 19,782