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ACCOUNTS RECEIVABLE
9 Months Ended
Sep. 30, 2011
Receivables [Abstract] 
Accounts Receivable
4.  ACCOUNTS RECEIVABLE
Accounts receivable consisted of the following (in thousands):
   
September 30,
  
December 31,
 
   
2011
  
2010
 
Accounts receivable
 $218,250  $92,893 
Allowance for doubtful accounts
  (4,366)  (3,889)
Accounts receivable, net
 $213,884  $89,004