Quarterly report pursuant to Section 13 or 15(d)

Deferred Charges, Goodwill And Other Assets (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details)

v2.4.1.9
Deferred Charges, Goodwill And Other Assets (Schedule Of Deferred Charges, Goodwill And Other Assets) (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2014
Deferred Charges, Goodwill And Other Assets [Line Items]      
Deferred leasing costs $ 226,649us-gaap_DeferredCostsLeasingGross   $ 239,138us-gaap_DeferredCostsLeasingGross
Deferred financing costs 20,755us-gaap_DeferredFinanceCostsGross   24,042us-gaap_DeferredFinanceCostsGross
Deferred charges, gross 247,404cli_DeferredCostsGross   263,180cli_DeferredCostsGross
Accumulated amortization (107,601)cli_AccumulatedAmortizationLeasingAndFinancingCosts   (122,358)cli_AccumulatedAmortizationLeasingAndFinancingCosts
Deferred charges, net 139,803us-gaap_DeferredCosts   140,822us-gaap_DeferredCosts
Notes receivable 21,430us-gaap_LoansAndLeasesReceivableNetReportedAmount [1]   21,491us-gaap_LoansAndLeasesReceivableNetReportedAmount [1]
In-place lease values, related intangible and other assets, net 6,021us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases   6,565us-gaap_FiniteLivedIntangibleAssetAcquiredInPlaceLeases
Goodwill 2,945us-gaap_Goodwill   2,945us-gaap_Goodwill
Prepaid expenses and other assets, net 40,561us-gaap_PrepaidExpenseAndOtherAssets   32,827us-gaap_PrepaidExpenseAndOtherAssets
Total deferred charges, goodwill and other assets 210,760us-gaap_OtherAssets   204,650us-gaap_OtherAssets
Lease revenue 123,793us-gaap_OperatingLeasesIncomeStatementLeaseRevenue 134,051us-gaap_OperatingLeasesIncomeStatementLeaseRevenue  
Mortgage Receivable [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Notes receivable 10,400us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember 		   
Spread over LIBOR 6.00%cli_MortgageLoansOnRealEstateBasisSpreadOverVariableInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= us-gaap_MortgageReceivablesMember 		   
8% Notes Receivable [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Notes receivable 7,800us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cli_EightPercentNotesReceivableMember 		   
Interest rate 8.00%us-gaap_MortgageLoansOnRealEstateInterestRate
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cli_EightPercentNotesReceivableMember 		   
Interest-Free Notes Receivable [Member]      
Deferred Charges, Goodwill And Other Assets [Line Items]      
Notes receivable $ 3,300us-gaap_LoansAndLeasesReceivableNetReportedAmount
/ us-gaap_AccountsNotesLoansAndFinancingReceivableByReceivableTypeAxis
= cli_InterestFreeNotesReceivableMember 		   
[1] Includes as of March 31, 2015: a mortgage receivable for $10.4 million which bears interest at LIBOR plus six percent and matures in August 2015; a note receivable for $7.8 million which bears interest at eight percent and matures in October 2017 (which was repaid in full to the Company on April 15, 2015); and an interest-free note receivable with a net present value of $3.3 million and matures in April 2023. The Company believes these balances are fully collectible.