Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details) - USD ($) $ in Thousands |
6 Months Ended | |
|---|---|---|
Feb. 28, 2019 |
Jun. 30, 2019 |
|
| Real Estate Properties [Line Items] | ||
| Gain (loss) on sale of investment in unconsolidated joint venture | $ 903 | |
| Red Bank [Member] | ||
| Real Estate Properties [Line Items] | ||
| Gain on sale | $ 900 | |
| Red Bank [Member] | Unconsolidated Joint Venture Office Buildings [Member] | ||
| Real Estate Properties [Line Items] | ||
| Gain (loss) on sale of investment in unconsolidated joint venture | 4,200 | |
| Gain on sale | $ 900 |