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Accounts Receivable (Tables)

12 Months Ended

Dec. 31, 2011

Accounts Receivable

Schedule of allowance for bad debt

		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

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Tabular disclosure of the activity in the allowance for doubtful accounts.

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