Noncontrolling Interests In Subsidiaries (Narrative) (Details)
$ in Millions |
|
12 Months Ended |
|
Jun. 05, 2015
shares
|
Dec. 31, 2020
USD ($)
property
shares
|
Dec. 31, 2019
shares
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Number of common shares received upon redemption of common units |
|
1
|
|
| Rebalance of ownership percentage | $ |
|
$ 2.6
|
|
| Shares granted |
800,000
|
|
|
| Exercisable period |
|
10 years
|
|
| Participation Rights [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Number of properties | property |
|
1
|
|
| Excess net cash flow remaining after the distribution to the Company |
|
50.00%
|
|
| Internal rate of return |
|
10.00%
|
|
| Mack-Cali Realty LP [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Percentage of noncontrolling interest |
|
9.60%
|
9.60%
|
| Future Developments [Member] | Participation Rights [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Number of properties | property |
|
1
|
|
| Disposal Group, Not Discontinued Operations [Member] | Flex Portfolio [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Redemption of common units, shares |
|
138,615
|
|
| Value of units redeemed | $ |
|
$ 2.7
|
|
| AO LTIP Units Award [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Exercisable period |
|
10 years
|
|
| AO LTIP Units Award [Member] | Messr DeMarco, CEO [Member] |
|
|
|
| Noncontrolling Interest [Line Items] |
|
|
|
| Shares granted |
|
625,000
|
625,000
|