Quarterly report pursuant to Section 13 or 15(d)

Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details)

v2.4.1.9
Segment Reporting (Schedule Of Reconciliation Of Net Operating Income To Income From Continuing Operations) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Segment Reporting [Abstract]    
Net operating income $ 37,333cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment [1] $ 27,357cli_SegmentReportingInformationNetOperatingIncomeLossForReportableSegment [1]
Depreciation and amortization (40,802)us-gaap_DepreciationAndAmortization (44,985)us-gaap_DepreciationAndAmortization
Realized gains (losses) on disposition of rental property, net 144us-gaap_GainLossOnDispositionOfAssets  
Net loss (3,325)us-gaap_ProfitLoss (17,628)us-gaap_ProfitLoss
Noncontrolling interest in consolidated joint ventures 490us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable 322us-gaap_NoncontrollingInterestInNetIncomeLossJointVenturePartnersNonredeemable
Noncontrolling interest in Operating Partnership 314us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable 2,008us-gaap_NoncontrollingInterestInNetIncomeLossOperatingPartnershipsNonredeemable
Net loss available to common shareholders $ (2,521)us-gaap_NetIncomeLoss $ (15,298)us-gaap_NetIncomeLoss
[1] Net operating income represents total revenues less total operating and interest expenses (as defined in Note “a”), plus equity in earnings (loss) of unconsolidated joint ventures, for the period.