Net Investment in Direct Finance Leases (Details) (USD $)	Jun. 30, 2013		Dec. 31, 2012
Net investment in direct financing leases [Abstract]
Gross finance lease receivables	$ 99,827,000	[1]	$ 116,999,000	[1]
Unearned income	(22,744,000)	[2]	(31,445,000)	[2]
Net investment in finance leases	77,083,000		85,554,000
Unguaranteed residual value	100,000		9,100,000
Executory costs	0		0
Unamortized initial direct costs	0		0
Gross Finance Lease Receivables [Line Items]
Gross finance lease receivables	99,827,000	[1]	116,999,000	[1]
Contractual maturities of gross finance lease receivables [Abstract]
2014	18,909,000
2015	17,938,000
2016	17,237,000
2017	14,825,000
2018	19,359,000
2019 and thereafter	11,559,000
Tier 1 [Member]
Net investment in direct financing leases [Abstract]
Gross finance lease receivables	82,086,000		98,611,000
Gross Finance Lease Receivables [Line Items]
Gross finance lease receivables	82,086,000		98,611,000
Tier 2 [Member]
Net investment in direct financing leases [Abstract]
Gross finance lease receivables	17,741,000		18,388,000
Gross Finance Lease Receivables [Line Items]
Gross finance lease receivables	17,741,000		18,388,000
Tier 3 [Member]
Net investment in direct financing leases [Abstract]
Gross finance lease receivables	0		0
Gross Finance Lease Receivables [Line Items]
Gross finance lease receivables	$ 0		$ 0

[1] At the inception of the lease, the Company records the total minimum lease payments, executory costs, if any, and unguaranteed residual value as gross finance lease receivables. The gross finance lease receivables are reduced as customer payments are received. Approximately $0.1 million and $9.1 million of unguaranteed residual value at June 30, 2013 and December 31, 2012, respectively, were included in gross finance lease receivables. There were no executory costs included in gross finance lease receivables as of June 30, 2013 and December 31, 2012.

[2] The difference between the gross finance lease receivable and the cost of the equipment or carrying amount at the lease inception is recorded as unearned income. Unearned income together with initial direct costs, are amortized to income over the lease term so as to produce a constant periodic rate of return. There were no unamortized initial direct costs as of June 30, 2013 and December 31, 2012.