Investment in Direct Financing Leases - (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2013
Dec. 31, 2012
Capital Leases, Net Investment in Direct Financing Leases [Abstract]    
Minimum lease payments receivable $ 17,535 $ 18,566
Estimated residual value of leased assets 27,718 27,854
Unearned income (10,815) (11,454)
Total $ 34,438 $ 34,966