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ACCOUNTS RECEIVABLE
6 Months Ended
Jun. 30, 2011
Receivables [Abstract]  
Accounts Receivable
3.  ACCOUNTS RECEIVABLE

Accounts receivable consisted of the following (in thousands):
   
June 30,
  
December 31,
 
   
2011
  
2010
 
Accounts receivable
 $247,943  $92,893 
Allowance for doubtful accounts
  (4,465)  (3,889)
Accounts receivable, net
 $243,478  $89,004