Reserves for Credit Losses

9 Months Ended

Sep. 30, 2012

Reserves for Credit Losses

4. Reserves for Credit Losses

In general, the terms of the Company’s trade receivables provide for payment terms of 30 days or less. The Company does not extend revolving credit to its customers with respect to these receivables. The portfolio of receivables consists of a large group of smaller balance homogeneous amounts that are collectively evaluated for impairment.

The following table presents the Company’s aging of accounts receivable:

	Age Analysis of Past Due Financing Receivables, Gross as of September 30, 2012, and September 30, 2011
	Current and Less Than 30 Days Past Due			30-59 Days Past Due			60-89 Days Past Due			Greater Than 90 Days Past Due			Total
2012
Accounts receivable, trade	$	1,595,483		$	32,031		$	6,123		$	7,130		$	1,640,767
Percent of total		97.2	%		2.0	%		0.4	%		0.4	%		100.00	%
2011
Accounts receivable, trade	$	1,478,362		$	31,025		$	7,059		$	8,722		$	1,525,168
Percent of total		96.9	%		2.0	%		0.5	%		0.6	%		100.00	%

The following table presents changes in reserves for credit losses related to accounts receivable:

	Nine months ended September 30,
	2012			2011
Balance, beginning of period	$	11,526		$	10,237
Provision for credit losses		14,874			20,464
Charge-offs		(20,397	)		(21,619	)
Recoveries of amounts previously charged-off		4,065			3,743
Balance, end of period	$	10,068		$	12,825