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ACCOUNTS RECEIVABLE (Details) - USD ($)
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2010
Receivables [Abstract]        
Accounts receivable $ 205,084,000 $ 268,340,000    
Allowance for doubtful accounts (5,706,000) (5,287,000) $ (5,130,000) $ (4,204,000)
Accounts receivable, net $ 199,378,000 $ 263,053,000