Commitments And Contingencies (Ground Lease Agreements) (Narrative) (Details) - USD ($) |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
Jun. 30, 2018 |
Jun. 30, 2017 |
Jun. 30, 2018 |
Jun. 30, 2017 |
|
| Commitments And Contingencies [Abstract] | ||||
| Ground lease expense incurred | $ 550,000 | $ 599,000 | $ 1,100,000 | $ 1,200,000 |