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ACCOUNTS RECEIVABLE (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2009
Dec. 31, 2008
Receivables [Abstract]        
Accounts receivable $ 193,731 $ 92,893    
Allowance for doubtful accounts (4,204) (3,889) (3,958) (6,639)
Accounts receivable, net $ 189,527 $ 89,004