Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Valuation and Qualifying Accounts Disclosure [Line Items]

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

			Additions
	Beginning Balance		Charged to Cost and Expenses		Charged to Other Accounts(a)			Deductions(b)			Ending Balance
Allowance for doubtful accounts
Year ended December 31, 2012	$	1,753	$	1,628	$	316		$	(1,660	)	$	2,037
Year ended December 31, 2011	1,347		3,363		259			(3,216		)	1,753
Year ended December 31, 2010	1,690		2,074		(617		)	(1,800		)	1,347

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(a)	Fee adjustments recorded as a reduction to revenue.
(b)	Uncollectible accounts written off, recoveries of billed accounts receivable and fee adjustments recorded against the allowance.