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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Receivables [Abstract]    
Trade accounts receivable, net of allowance of $4,777 and $14,337, respectively $ 83,482 $ 89,096
Unbilled receivables 25,670 30,882
Taxes receivable 11,305 42,870
Affiliated 716 717
Other receivables 6,037 3,852
Total accounts receivable, net 127,210 167,417
Trade accounts receivable allowance $ 4,777 $ 14,337