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ACCOUNTS RECEIVABLE (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Receivables [Abstract]    
Accounts receivable $ 335,514 $ 302,928
Allowance for doubtful accounts (6,146) (5,130)
Accounts receivable, net $ 329,368 $ 297,798