Finance Receivables (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013 tenant	Dec. 31, 2012
Credit Quality Of Finanace Receivables
Number of tenants	123
Net Investment in Direct Financing Leases	$ 360,701	$ 376,005
Internally Assigned Grade1
Credit Quality Of Finanace Receivables
Number of tenants	3	3
Net Investment in Direct Financing Leases	46,376	46,398
Internally Assigned Grade2
Credit Quality Of Finanace Receivables
Number of tenants	3	4
Net Investment in Direct Financing Leases	28,092	49,764
Internally Assigned Grade3
Credit Quality Of Finanace Receivables
Number of tenants	9	8
Net Investment in Direct Financing Leases	278,394	257,281
Internally Assigned Grade4
Credit Quality Of Finanace Receivables
Number of tenants	1	4
Net Investment in Direct Financing Leases	7,839	22,562
Internally Assigned Grade5
Credit Quality Of Finanace Receivables
Number of tenants
Net Investment in Direct Financing Leases	$ 0	$ 0