Accounts Receivable

6 Months Ended

Jun. 30, 2011

Accounts Receivable [Abstract]

Accounts Receivable

(4)      Accounts Receivable:

The components of accounts receivable, net are as follows:

($ in thousands)	June 30, 2011			December 31, 2010
End user	$	555,999		$	627,573
Other		19,433			14,306
Less: Allowance for doubtful accounts		(61,580	)		(73,571	)
Accounts receivable, net	$	513,852		$	568,308

We maintain an allowance for estimated bad debts based on our estimate of our ability to collect accounts receivable. Bad debt expense, which is recorded as a reduction to revenue, was $18.1 million and $5.2 million for the three months ended June 30, 2011 and 2010, respectively, and $46.4 million and $11.4 million for the six months ended June 30, 2011 and 2010, respectively.