Investment in Loans (Schedule of 90 Days or More Past Due) (Details) - 90 Days or More Past Due [Member] $ in Thousands |
Mar. 31, 2019
USD ($)
|
|---|---|
| Commercial mortgage loans | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| 90 days or more past due—accrual status, Unpaid Principal Balance | $ 6,491 |
| 90 days or more past due—accrual status, Fair Value | 6,491 |
| 90 days or more past due—non-accrual status, Unpaid Principal Balance | 16,050 |
| 90 days or more past due—non-accrual status, , Fair Value | 16,050 |
| Residential mortgage loans | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| 90 days or more past due—non-accrual status, Unpaid Principal Balance | 18,582 |
| 90 days or more past due—non-accrual status, , Fair Value | 16,110 |
| Consumer loans | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| 90 days or more past due—non-accrual status, Unpaid Principal Balance | 2,046 |
| 90 days or more past due—non-accrual status, , Fair Value | $ 2,025 |