Summary of Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Valuation and Qualifying Accounts Disclosure [Text Block]

	2012			2011			2010
Balance, beginning of period	$	7,700		$	6,580		$	5,795
Provision for losses	4,860			4,156			3,063
Write-offs	(5,573		)	(3,036		)	(2,278		)
Balance, end of period	$	6,987		$	7,700		$	6,580

Estimated Amortization of Identified Intangible Assets for Next Five Years

Year ending December 31,	Amount
2013	$	349
2014	$	349
2015	$	349
2016	$	251
2017	$	87