Investments - Schedule of Loans Receivable, Net of Premium and Allowance for Loan Losses (Details) - USD ($) $ in Thousands |
Mar. 31, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Total loans receivable, net | $ 67,880 | $ 66,578 |
| Mortgage Loans | ||
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Loans and leases receivable, gross | 54,332 | 55,410 |
| Mortgage loans - premium, net of amortization | 6,647 | 7,194 |
| Total loans receivable, net | 60,979 | 62,604 |
| Notes Receivable | ||
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Loans and leases receivable, gross | 7,401 | 4,474 |
| Total loans receivable, net | 6,901 | 3,974 |
| Allowance for loan losses | $ (500) | $ (500) |