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Accounts Receivable (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Receivables [Abstract]    
Accounts receivable $ 6,211,077 $ 6,103,038
Allowances for doubtful accounts (49,659) (59,188)
Accounts receivable, net $ 6,161,418 $ 6,043,850