Basis of Presentation (Tables)

12 Months Ended

Dec. 31, 2012

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Summary of Bad Debt Expense [Table Text Block]

Bad debt expense is summarized as follows:

	Year Ended
	December 31, 2012		December 31, 2011		December 31, 2010
Bad debt expense	$	1,628	$	3,363	$	2,074