Quarterly report pursuant to Section 13 or 15(d)

Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of General Partner Capital) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of General Partner Capital) (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Balance     $ 1,486,658  
Issuance of limited partner common units   $ 22,735   $ 22,786
Common unit distributions $ (2,360) (2,364) (6,417) (6,760)
Redeemable noncontrolling interests (6,471) (3,785) (16,144) (9,573)
Redemption of common units for common stock (65)      
Redemption of common units     (6,695)  
Shares issued under Dividend Reinvestment and Stock Purchase Plan       (41)
Directors' deferred compensation plan 81 127 238 378
Other comprehensive income (loss) (878) 354 (9,953) 7,287
Balance 1,569,261   1,569,261  
General Partner Common Unitholders [Member]        
Balance 1,645,587 1,487,247 1,486,658 1,476,295
Net income (loss) 55,928 1,478 (166,513) (40,307)
Common unit distributions (18,106) (18,056) (54,282) (54,136)
Redeemable noncontrolling interests (3,025) (2,666) (22,936) (8,799)
Change in noncontrolling interests in consolidated joint ventures     (1,958)  
Redemption of common units for common stock   400 705 4,141
Redemption of common units     (1,665)  
Shares issued under Dividend Reinvestment and Stock Purchase Plan 10 13 31 (41)
Directors' deferred compensation plan 81 127 238 378
Stock compensation 7 202 490 1,153
Cancellation of restricted shares       (583)
Cancellation of unvested LTIP units     2,819  
Other comprehensive income (loss) (791) 318 (8,993) 6,545
Rebalancing of ownership percentage between parent and subsidiaries 1,426 937 1,641 1,784
Balance $ 1,569,261 $ 1,467,044 $ 1,569,261 $ 1,467,044