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Accounts Receivable
 12 Months Ended
Dec. 31, 2011
Accounts Receivable  
Accounts Receivable

2. Accounts Receivable

We had accounts receivable of $2.2 billion and $1.4 billion, net of an allowance for bad debt of $24.3 million and $20.2 million, as of December 31, 2011 and 2010, respectively. Accounts receivable are written-off when it becomes apparent based upon age or customer circumstances that such amounts will not be collected.

The following table sets forth activities in our allowance for bad debt (in thousands):

 
   2011
   2010
   2009
 

Balance at beginning of period

   $20,201   $19,690   $23,271

Charges to provision for bad debt

   8,173   4,262   4,552

Write-off of uncollectible accounts receivable

   (4,681)   (4,291)   (8,800)

Recoveries of bad debt

   608   540   667
 

Balance at end of period

   $24,301   $20,201   $19,690
 

Included in accounts receivable, as of December 31, 2011, 2010 and 2009, were net receivables due from Signature, a related party, of $25.7 million, $21.2 million and $10.4 million, respectively. For 2011, 2010 and 2009, sales to Signature from Page Avjet Fuel Co. LLC ("PAFCO"), a controlled subsidiary owned in conjunction with Signature, amounted to $388.5 million, $233.3 million and $107.7 million, respectively. In addition to PAFCO's sales to Signature, in the normal course of business, we utilize Signature and Aircraft Service International Group ("ASIG"), a sister company of Signature, as subcontractors to provide various services to customers, including into-plane fueling at airports, and transportation and storage of fuel and fuel products. These activities with Signature and ASIG were not considered to be significant.