Investments - Schedule of Loans Receivable, Net of Premium and Allowance for Loan Losses (Details) - USD ($) |
Sep. 30, 2016 |
Dec. 31, 2015 |
|---|---|---|
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Total loans receivable, net | $ 69,218,000 | $ 104,003,000 |
| Allowance for loan losses | 0 | (300,000) |
| Mortgage Loans | ||
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Loans and leases receivable, gross | 57,422,000 | 90,096,000 |
| Mortgage loans - premium | 7,752,000 | 9,986,000 |
| Total loans receivable, net | 65,174,000 | 100,082,000 |
| Notes Receivable | ||
| Loans and Leases Receivable Disclosure [Line Items] | ||
| Loans and leases receivable, gross | 4,044,000 | 4,245,000 |
| Total loans receivable, net | 4,044,000 | 3,921,000 |
| Allowance for loan losses | $ 0 | $ (324,000) |