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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivables, net $ 214,462 $ 246,191
Unbilled revenue 34,543 40,033
Taxes receivable 34,871 34,163
Affiliated 770 3,966
Other receivables 1,312 1,773
Trade accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivables, net 142,966 166,256
Allowance for trade accounts receivable $ 2,831 $ 2,528