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 Restricted Stock Awards) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital (Schedule Of Restricted Stock Awards) (Details) - $ / shares
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]    
Shares, Outstanding, Beginning balance 42,690 67,289
Shares, Cancelled (968)
Shares, Outstanding, Ending balance 42,690 66,321
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 21.08 $ 22.43
Weighted-Average Grant-Date Fair Value, Cancelled 25.83
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 21.08 $ 22.38