Finance Receivables (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2011	Dec. 31, 2010
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	$ 76,114,000	$ 76,550,000
Accounts Receivable Billed Under Direct Financing Leases	300,000	300,000
Internally Assigned Grade1 [Member] | Nine Tenants [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	49,222,000	49,533,000
Internally Assigned Grade2 [Member] | Five Tenants [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	24,327,000	24,447,000
Internally Assigned Grade3 [Member] | One Tenant [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	2,565,000
Internally Assigned Grade3 [Member] | Zero Tenant [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases		0
Internally Assigned Grade4 [Member] | One Tenant [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases		2,570,000
Internally Assigned Grade4 [Member] | Zero Tenant [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	0
Internally Assigned Grade5 [Member] | Zero Tenant [Member]
Financing Receivable Recorded Investment [Line Items]
Net investments in direct financing leases	$ 0	$ 0