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Accounts Receivable - Accounts receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2022
Dec. 31, 2021
Accounts Receivable.    
Billed $ 315,332 $ 181,500
Unbilled 103,498 70,353
Other receivables 4,816 13,547
Total 423,646 265,400
Less: allowance for credit losses (7,078) (6,765)
Accounts receivable, net $ 416,568 $ 258,635