Valuation and Qualifying Accounts

12 Months Ended

Dec. 31, 2012

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

	Beginning Balance		Charged to Costs and Expenses		Deductions			Acquisitions		Ending Balance
Year ended December 31, 2010
Allowance for doubtful accounts	$	432	$	173	$	(109	)	$	319	$	815
Year ended December 31, 2011
Allowance for doubtful accounts		815		2,297		(450	)		—		2,662
Year ended December 31, 2012
Allowance for doubtful accounts	$	2,662	$	2,852	$	(1,370	)	$	215	$	4,359