Investment in Loans (Schedule of Consumer Mortgage Loans) (Details) (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 |
| Consumer loans | |
| Accounts, Notes, Loans and Financing Receivable [Line Items] | |
| Unpaid Principal Balance | 184,171 |
| Premium (Discount) | 6,912 |
| Amortized Cost | 191,083 |
| Gains | 2,623 |
| Losses | (1,591) |
| Fair Value | $ 192,115 |
| Life (Years) | 285 days |
| Delinquency (Days) | 3 days |