Valuation and Qualifying Accounts

3 Months Ended

Mar. 31, 2011

Valuation and Qualifying Accounts [Abstract]

Valuation and Qualifying Accounts

5. Valuation and Qualifying Accounts

	Balance at							Balance at
	Beginning of		Charged to					End of
	Period		Expense		Deductions(1)			Period
Allowance for doubtful accounts receivable:
Three months ended March 31, 2011 (Restated)	$	30,112		10,034		(8,780	)	$	31,366
Three months ended March 31, 2010	$	7,553		4,774		(4,479	)	$	7,848

(1) Deductions represent accounts written off, net of recoveries.