Annual report pursuant to Section 13 and 15(d)

Mortgages, Loans Payable And Other Obligatons (Schedule Of Principal Payments) (Details)

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Mortgages, Loans Payable And Other Obligatons (Schedule Of Principal Payments) (Details) (USD $)
Dec. 31, 2014
Dec. 31, 2013
Debt Disclosure [Abstract]    
Scheduled Amortization, 2015 $ 8,811,000cli_DebtDiscountPremiumFutureAmortizationYearOne  
Scheduled Amortization, 2016 8,311,000cli_DebtDiscountPremiumFutureAmortizationYearTwo  
Scheduled Amortization, 2017 7,275,000cli_DebtDiscountPremiumFutureAmortizationYearThree  
Scheduled Amortization, 2018 7,311,000cli_DebtDiscountPremiumFutureAmortizationYearFour  
Scheduled Amortization, 2019 723,000cli_DebtDiscountPremiumFutureAmortizationYearFive  
Scheduled Amortization, Thereafter 6,329,000cli_DebtDiscountPremiumFutureAmortizationThereafter  
Scheduled Amortization, Sub-total 38,760,000cli_DebtDiscountPremiumFutureAmortizationGross  
Adjustment for unamortized debt discount/premium and mark-to-market, net, as of December 31, 2013 (11,620,000)us-gaap_DebtInstrumentUnamortizedDiscount  
Scheduled Ammortization, Total 27,140,000cli_DebtDiscountPremiumFutureAmortizationNet  
Principal Maturities, 2015 167,589,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInNextTwelveMonths  
Principal Maturities, 2016 333,272,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearTwo  
Principal Maturities, 2017 392,345,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearThree  
Principal Maturities, 2018 231,536,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFour  
Principal Maturities, 2019 331,567,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalInYearFive  
Principal Maturities, Thereafter 605,205,000us-gaap_LongTermDebtMaturitiesRepaymentsOfPrincipalAfterYearFive  
Principal Maturities, Total 2,061,514,000cli_LongTermDebtMaturitiesRepaymentsOfPrincipal  
Total, 2015 176,400,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalYearOne  
Total, 2016 341,583,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalYearTwo  
Total, 2017 399,620,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalYearThree  
Total, 2018 238,847,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalYearFour  
Total, 2019 332,290,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalYearFive  
Total, Thereafter 611,534,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalAfterYearFive  
Total, Sub-total 2,100,274,000cli_LongTermDebtAmortizationAndRepaymentsOfPrincipalGross  
Total $ 2,088,654,000us-gaap_LongTermDebt $ 2,362,766,000us-gaap_LongTermDebt