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Accounts Receivable - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Accounts Receivable.    
Billed $ 181,500 $ 135,201
Unbilled 70,353 29,754
Other receivables 13,547 1,631
Total 265,400 166,586
Less: allowance for credit losses (6,765) (4,815)
Accounts receivable, net $ 258,635 $ 161,771