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ACCOUNTS RECEIVABLE (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Receivables [Abstract]    
Accounts receivable $ 250,740 $ 193,731
Allowance for doubtful accounts (4,792) (4,204)
Accounts receivable, net $ 245,948 $ 189,527