Recent Transactions (Schedule Of Disposed Developable Land) (Details) - Disposal Group, Not Discontinued Operations [Member] $ in Thousands |
3 Months Ended |
|---|---|
|
Mar. 31, 2020
USD ($)
| |
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |
| Net Sales Proceeds | $ 15,992 |
| Net Carrying Value | 11,179 |
| Realized Gains (losses)/Unrealized Losses, net | 4,813 |
| 230 & 250 Half Mile Road [Member] | |
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |
| Net Sales Proceeds | 7,018 |
| Net Carrying Value | 2,969 |
| Realized Gains (losses)/Unrealized Losses, net | 4,049 |
| Capital Office Park Land [Member] | |
| Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items] | |
| Net Sales Proceeds | 8,974 |
| Net Carrying Value | 8,210 |
| Realized Gains (losses)/Unrealized Losses, net | $ 764 |