Investment in Loans (Schedule of Commercial Mortgage Loans) (Details) (Details) $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2019
USD ($)
| |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| Unpaid Principal Balance | $ 1,026,983 |
| Commercial mortgage loans | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| Unpaid Principal Balance | 264,932 |
| Premium (Discount) | (27,249) |
| Amortized Cost | 237,683 |
| Gains | 2,131 |
| Losses | (191) |
| Fair Value | $ 239,623 |
| Coupon | 8.92% |
| Yield | 9.44% |
| Life (Years) | 347 days |