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ACCOUNTS RECEIVABLE (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Receivables [Abstract]        
Accounts receivable $ 245,236 $ 229,677    
Allowance for doubtful accounts (3,404) (2,974) $ (3,344) $ (4,527)
Accounts receivable, net $ 241,832 $ 226,703