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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Receivables [Abstract]    
Trade accounts receivable, net of allowance for credit losses of $4,142 and $5,129, respectively $ 61,619 $ 101,718
Allowance for credit losses 4,142 5,129
Unbilled receivables 23,050 43,422
Taxes receivable 11,219 18,516
Affiliated 549 549
Other receivables 3,384 2,489
Total accounts receivable, net $ 99,821 $ 166,694