Quarterly report pursuant to Section 13 or 15(d)

Investments In Unconsolidated Joint Ventures (Summary Of Results Of Operations Of Unconsolidated Joint Ventures) (Details)

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Investments In Unconsolidated Joint Ventures (Summary Of Results Of Operations Of Unconsolidated Joint Ventures) (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Investments In Unconsolidated Joint Ventures [Abstract]    
Total revenues $ 74,477us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 30,993us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating and other expenses (57,356)cli_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOther (18,353)cli_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOther
Depreciation and amortization (16,993)cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization (8,368)cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
Interest expense (11,334)cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense (6,341)cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Net loss $ (11,206)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ (2,069)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss