Commitments And Contingencies (Future Minimum Rental Payments Of Ground Leases) (Details) - USD ($) $ in Thousands |
Sep. 30, 2020 |
Dec. 31, 2019 |
|---|---|---|
| Commitments And Contingencies [Abstract] | ||
| Remaining | $ 437 | |
| Year one | 1,750 | $ 1,750 |
| Year two | 1,750 | 1,750 |
| Year three | 1,756 | 1,750 |
| Year four | 1,776 | 1,756 |
| Year five | 1,776 | |
| 2025 through 2098 | 154,722 | 154,722 |
| Total lease payments | 162,191 | 163,504 |
| Less: imputed interest | (138,404) | (139,748) |
| Total | $ 23,787 | $ 23,756 |