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ACCOUNTS RECEIVABLE (Details) (USD $)
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Receivables [Abstract]        
Accounts receivable $ 302,928,000 $ 193,731,000    
Allowance for doubtful accounts (5,130,000) (4,204,000) (3,889,000) (3,958,000)
Accounts receivable, net 297,798,000 189,527,000    
Factoring Facility, Maximum Borrowing Capacity 14,500,000      
Factoring Facility, Amount Outstanding $ 4,900,000