Allowance for Credit Losses (Tables)

12 Months Ended

Dec. 31, 2012

Receivables [Abstract]

Allowance for credit losses and recorded investment in financing receivables

The following table summarizes the Company’s allowance for credit losses and amount of financing receivables evaluated for impairment:

	Finance Leases			Notes Receivable			Total
Allowance for credit losses
Balance at January 1, 2011	$	378		$	470		$	848
Provision for credit losses	107			2,078			2,185
Recoveries	138			5,455			5,593
Write-offs	(413		)	(5,956		)	(6,369		)
Balance at December 31, 2011	$	210		$	2,047		$	2,257
Provision for credit losses	263			—			263
Recoveries	52			—			52
Write-offs	—			—			—
Balance at December 31, 2012	$	525		$	2,047		$	2,572

Summarizes the Company's aging of past-due notes receivable

The following table summarizes the Company’s aging of past-due notes receivable balances:

	December 31,
	2012		2011
30-59 days past due	$	—	$	—
60-89 days past due	—		—
> 89 days past due	1,840		1,495
Total past due	$	1,840	$	1,495