Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Mack-Cali Realty Corporation Stockholders' Equity And Mack-Cali Realty, L.P.'s Partners' Capital [Abstract]      
Shares, Outstanding, Beginning balance 67,289 108,318 145,278
Shares, Granted 42,690 40,185 59,985
Shares, Vested (65,353) (72,502) (95,009)
Shares, Forfeited (1,936) (8,712) (1,936)
Shares, Outstanding, Ending balance 42,690 67,289 108,318
Weighted-Average Grant-Date Fair Value, Outstanding beginning balance $ 22.43 $ 25.49 $ 21.76
Weighted-Average Grant-Date Fair Value, Granted 21.08 20.16 27.00
Weighted-Average Grant-Date Fair Value, Vested 22.34 25.33 20.73
Weighted-Average Grant-Date Fair Value, Forfeited 25.83 25.83 25.83
Weighted-Average Grant-Date Fair Value, Outstanding ending balance $ 21.08 $ 22.43 $ 25.49