Investment in Direct Financing Leases (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Capital Leases, Net Investment in Direct Financing Leases [Abstract]    
Minimum lease payments receivable $ 18,566 $ 21,487
Estimated residual value of leased assets 27,854 27,854
Unearned income (11,454) (13,342)
Total 34,966 35,999
Capital Leases, Net Investment In Direct Financing Leases, Minimum Payments [Abstract]    
2013 2,932  
2014 2,782  
2015 2,403  
2016 2,019  
2017 1,545  
Thereafter 6,885  
Total $ 18,566 $ 21,487