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ACCOUNTS RECEIVABLE (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Receivables [Abstract]    
Accounts receivable $ 334,073 $ 268,340
Allowance for doubtful accounts (6,046) (5,287)
Accounts receivable, net $ 328,027 $ 263,053