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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2018
Dec. 31, 2017
Receivables [Abstract]    
Trade accounts receivable, net of allowance of $3,915 and $4,777, respectively $ 98,997 $ 83,482
Allowance for trade accounts receivable 3,915 4,777
Unbilled revenue 49,700 25,670
Taxes receivable 9,423 11,305
Affiliated 549 716
Other receivables 4,351 6,037
Total accounts receivable, net $ 163,020 $ 127,210