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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]        
Accounts receivable $ 182,728 $ 181,916    
Allowance for doubtful accounts (3,344) (4,527) $ (5,706) $ (5,287)
Accounts receivable, net $ 179,384 $ 177,389