Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Accounting Policies [Abstract]

Schedule Of Allowance For Doubtful Accounts Receivable [Table Text Block]

The allowance for doubtful accounts is summarized as follows (in thousands):

	Balance at
	Beginning		Charged to					Balance at
Year Ended December 31:	of Period		Expense		Write-Offs			End of Period
2012	$	246	$	1,728	$	(1,853	)	$	121
2011		431		1,566		(1,751	)		246