Recent Transactions (Unconsolidated Joint Venture Activity) (Narrative) (Details) - USD ($)
$ in Thousands |
|
|
3 Months Ended |
6 Months Ended |
Feb. 15, 2017 |
Jan. 31, 2017 |
Jun. 30, 2016 |
Jun. 30, 2017 |
Jun. 30, 2016 |
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
|
$ 5,670
|
$ 12,563
|
$ 5,670
|
| Proceeds from the sale of investments in unconsolidated joint ventures |
|
|
|
14,849
|
6,420
|
| Investment in unconsolidated joint ventures |
|
|
|
11,422
|
23,657
|
| Mack-Cali Realty LP [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
|
$ 5,670
|
12,563
|
5,670
|
| Proceeds from the sale of investments in unconsolidated joint ventures |
|
|
|
14,849
|
6,420
|
| Investment in unconsolidated joint ventures |
|
|
|
$ 11,422
|
$ 23,657
|
| KPG-P 100 IMW JV, LLC, Keystone-Penn And Keystone-Tristate [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Gain on sale of investment in unconsolidated joint venture |
|
$ 7,400
|
|
|
|
| Proceeds from the sale of investments in unconsolidated joint ventures |
|
$ 9,700
|
|
|
|
| Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Proceeds from the sale of investments in unconsolidated joint ventures |
$ 5,100
|
|
|
|
|
| Elmajo Urban Renewal Associates, LLC And Estuary Urban Renewal Associates, LLC [Member] | Unconsolidated Joint Venture Multi-Family Properties [Member] |
|
|
|
|
|
| Real Estate Properties [Line Items] |
|
|
|
|
|
| Gain on sale of investment in unconsolidated joint venture |
5,100
|
|
|
|
|
| Proceeds from the sale of investments in unconsolidated joint ventures |
$ 5,100
|
|
|
|
|