Leases (Schedule of Future Minimum Rent from Lessee for Ground Leases) (Details) - USD ($) $ in Thousands |
Mar. 31, 2019 |
Dec. 31, 2018 |
|---|---|---|
| Leases [Abstract] | ||
| Nine months ending December 31, 2019 | $ 402 | |
| 2020 | 536 | |
| 2021 | 536 | |
| 2022 | 536 | |
| 2023 | 536 | |
| Thereafter | 70,165 | |
| Total undiscounted rental payments | 72,711 | |
| Less imputed interest | (63,961) | |
| Total operating lease liabilities | $ 8,750 | $ 0 |