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 Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Reconciliation Of Shares Used In Basic EPS Calculation To Shares Used In Diluted EPS Calculation) (Details) - shares
shares in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Stockolders Equity [Line Items]        
Basic EPS shares 90,584 90,468 90,539 90,355
Add: Operating Partnership - common and vested LTIP units 9,976 10,244 10,068 10,251
Restricted Stock Awards     24  
Stock Options     171 78
Diluted EPS Shares 100,560 100,712 100,802 100,684
Mack-Cali Realty LP [Member]        
Stockolders Equity [Line Items]        
Basic EPS units 100,560 100,712 100,607 100,606
Restricted Stock Awards     24  
Stock Options     171 78
Diluted EPU Units 100,560 100,712 100,802 100,684