Finance Receivables (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Credit Quality Of Finanace Receivables:
Net investments in direct financing leases	$ 474,018	$ 475,872
Notes receivable	40,000	40,000
Internally Assigned Grade1 [Member]
Credit Quality Of Finanace Receivables:
Number Of DFL Tenants	1	1
Number of Obligors
Net investments in direct financing leases	2,242	2,239
Notes receivable	0	0
Internally Assigned Grade2 [Member]
Credit Quality Of Finanace Receivables:
Number Of DFL Tenants	1	2
Number of Obligors
Net investments in direct financing leases	37,929	60,218
Notes receivable	0	0
Internally Assigned Grade3 [Member]
Credit Quality Of Finanace Receivables:
Number Of DFL Tenants	6	8
Number of Obligors	1	1
Net investments in direct financing leases	347,658	413,415
Notes receivable	40,000	40,000
Internally Assigned Grade4 [Member]
Credit Quality Of Finanace Receivables:
Number Of DFL Tenants	3	0
Number of Obligors
Net investments in direct financing leases	86,189	0
Notes receivable	0	0
Internally Assigned Grade5 [Member]
Credit Quality Of Finanace Receivables:
Number Of DFL Tenants	0	0
Number of Obligors
Net investments in direct financing leases	0	0
Notes receivable	$ 0	$ 0