Allowance for Credit Losses (Details) (USD $) In Thousands	6 Months Ended
	Jun. 30, 2011
Allowance for credit losses (Textuals)
Balance January 1, 2011	$ 848
Provision for credit losses	1,661
Recoveries	5,548
Write-offs	(6,310)
Balance individually evaluated for impairment	1,747
Balance collectively evaluated for impairment	0
Balance June 30, 2011	1,747
Recorded investment in financing receivables
Balance individually evaluated for impairment	133,745
Balance collectively evaluated for impairment	0
Balance June 30, 2011	133,745
Notes Receivable [Member]
Allowance for credit losses (Textuals)
Balance January 1, 2011	470
Provision for credit losses	1,652
Recoveries	5,454
Write-offs	(5,956)
Balance individually evaluated for impairment	1,620
Balance collectively evaluated for impairment	0
Balance June 30, 2011	1,620
Recorded investment in financing receivables
Balance individually evaluated for impairment	16,540
Balance collectively evaluated for impairment	0
Balance June 30, 2011	16,540
Finance Leases [Member]
Allowance for credit losses (Textuals)
Balance January 1, 2011	378
Provision for credit losses	9
Recoveries	94
Write-offs	(354)
Balance individually evaluated for impairment	127
Balance collectively evaluated for impairment	0
Balance June 30, 2011	127
Recorded investment in financing receivables
Balance individually evaluated for impairment	117,205
Balance collectively evaluated for impairment	0
Balance June 30, 2011	$ 117,205