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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Receivables [Abstract]    
Trade accounts receivable, net of allowance of $3,671 and $3,925, respectively $ 135,337 $ 114,630
Allowance for trade accounts receivable 3,671 3,925
Unbilled receivables 48,537 54,591
Taxes receivable 17,500 15,762
Affiliated 549 549
Other receivables 2,724 3,882
Total accounts receivable, net $ 204,647 $ 189,414