Valuation and Qualifying Accounts (Tables)

6 Months Ended

Jun. 30, 2011

Valuation and Qualifying Accounts (Tables) [Abstract]

Valuation and Qualifying Accounts

	Balance at							Balance at
	Beginning of		Charged to					End of
	Period		Expense		Deductions(1)			Period
Allowance for doubtful accounts receivable:
Six months ended June 30, 2011 (Restated)	$	30,112		18,277		(11,444	)	$	36,945
Six months ended June 30, 2010 (Restated)	$	7,553		19,563		(6,644	)	$	20,472