Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)

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Mack-Cali Realty Corporation Stockholders' Equity (Deferred Stock Compensation Plan For Directors) (Narrative) (Details)	6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Dec. 31, 2010
Mack-Cali Realty Corporation Stockholders' Equity
Deferred stock units earned	6,385	6,311
Deferred stock units outstanding	90,585		84,236