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Accounts Receivable, net (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivables, net $ 324,527 $ 390,977
Unbilled revenue 50,002 62,993
Taxes receivable 43,105 32,056
Affiliated 3,824 3,370
Other receivables 3,047 1,418
Trade accounts receivable    
Accounts, Notes, Loans and Financing Receivable [Line Items]    
Accounts receivables, net 224,549 291,140
Allowance for doubtful accounts $ 2,217 $ 2,477