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Revenue Recognition - Accounts Receivable (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Allowance for Doubtful Accounts    
Beginning balance $ 5,344  
Additions charged to costs and expenses 1,599 $ 1,953
Deductions/write-offs (1,106)  
Ending balance $ 5,837