Investments - Schedule of Components of Real Estate Investments Held Under Direct Financing Leases (Details) - USD ($) $ in Thousands |
Sep. 30, 2015 |
Dec. 31, 2014 |
|---|---|---|
| Investments in and Advances to Affiliates, Schedule of Investments [Abstract] | ||
| Minimum lease payments receivable | $ 13,456 | $ 15,897 |
| Estimated residual value of leased assets | 43,789 | 55,858 |
| Unearned income | (12,892) | (15,191) |
| Real estate assets under direct financing leases, net | $ 44,353 | $ 56,564 |