Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Net Income Available To Common Shareholders) (Details) - USD ($)
$ in Thousands |
3 Months Ended |
9 Months Ended |
Sep. 30, 2021 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2020 |
| Segment Reporting Information [Line Items] |
|
|
|
|
| Net operating income |
$ 11,050
|
$ (5,653)
|
$ 26,063
|
$ 8,190
|
| Depreciation and amortization |
(29,344)
|
(31,769)
|
(86,410)
|
(93,104)
|
| Land and other impairments |
(3,401)
|
(1,292)
|
(11,333)
|
(23,401)
|
| Property impairments |
|
36,582
|
6,041
|
36,582
|
| Realized gains (losses) and unrealized gains (losses) on disposition of rental property, net |
(3,000)
|
|
521
|
(7,915)
|
| Gain on disposition of developable land |
|
|
111
|
4,813
|
| Gain on sale from unconsolidated joint ventures |
(1,886)
|
|
(1,886)
|
|
| Gain (loss) from extinguishment of debt, net |
|
|
(46,735)
|
|
| Income (loss) from continuing operations |
(26,581)
|
(75,296)
|
(125,710)
|
(147,999)
|
| Income from discontinued operations |
180
|
18,403
|
13,939
|
60,004
|
| Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, net |
609
|
15,775
|
25,469
|
(23,901)
|
| Total discontinued operations, net |
789
|
34,178
|
39,408
|
36,103
|
| Net loss |
(25,792)
|
(41,118)
|
(86,302)
|
(111,896)
|
| Noncontrolling interests in consolidated joint ventures |
1,137
|
895
|
3,670
|
1,900
|
| Noncontrolling interests in Operating Partnership |
2,884
|
7,769
|
12,858
|
15,859
|
| Noncontrolling interests in Operating Partnership in discontinued operations |
(72)
|
(3,283)
|
(3,583)
|
(3,469)
|
| Redeemable noncontrolling interests |
(6,471)
|
(6,471)
|
(19,413)
|
(19,413)
|
| Net loss available to common shareholders |
(28,314)
|
(42,208)
|
(92,770)
|
(117,019)
|
| Mack-Cali Realty LP [Member] |
|
|
|
|
| Segment Reporting Information [Line Items] |
|
|
|
|
| Net operating income |
11,050
|
(5,653)
|
26,063
|
8,190
|
| Depreciation and amortization |
(29,344)
|
(31,769)
|
(86,410)
|
(93,104)
|
| Land and other impairments |
(3,401)
|
(1,292)
|
(11,333)
|
(23,401)
|
| Property impairments |
|
36,582
|
6,041
|
36,582
|
| Realized gains (losses) and unrealized gains (losses) on disposition of rental property, net |
(3,000)
|
|
521
|
(7,915)
|
| Gain on disposition of developable land |
|
|
111
|
4,813
|
| Gain on sale from unconsolidated joint ventures |
(1,886)
|
|
(1,886)
|
|
| Gain (loss) from extinguishment of debt, net |
|
|
(46,735)
|
|
| Income (loss) from continuing operations |
(26,581)
|
(75,296)
|
(125,710)
|
(147,999)
|
| Income from discontinued operations |
180
|
18,403
|
13,939
|
60,004
|
| Realized gains (losses) and unrealized gains (losses) on disposition of rental property and impairments, net |
609
|
15,775
|
25,469
|
(23,901)
|
| Total discontinued operations, net |
789
|
34,178
|
39,408
|
36,103
|
| Net loss |
(25,792)
|
(41,118)
|
(86,302)
|
(111,896)
|
| Noncontrolling interests in consolidated joint ventures |
1,137
|
895
|
3,670
|
1,900
|
| Redeemable noncontrolling interests |
(6,471)
|
(6,471)
|
(19,413)
|
(19,413)
|
| Net loss available to common shareholders |
$ (31,126)
|
$ (46,694)
|
$ (102,045)
|
$ (129,409)
|