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ACCOUNTS RECEIVABLE (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Receivables [Abstract]    
Accounts receivable $ 242,158 $ 193,731
Allowance for doubtful accounts (4,740) (4,204)
Accounts receivable, net $ 237,418 $ 189,527