Annual report pursuant to Section 13 and 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
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Investments In Unconsolidated Joint Ventures [Abstract]      
Total revenues $ 305,034us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 255,510us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue $ 68,183us-gaap_EquityMethodInvestmentSummarizedFinancialInformationRevenue
Operating and other expenses (233,320)cli_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOther (217,739)cli_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOther (37,008)cli_EquityMethodInvestmentSummarizedFinancialInformationOperatingAndOther
Depreciation and amortization (42,985)cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization (32,889)cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization (10,139)cli_EquityMethodInvestmentSummarizedFinancialInformationDepreciationAndAmortization
Interest expense (32,862)cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense (16,709)cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense (6,775)cli_EquityMethodInvestmentSummarizedFinancialInformationInterestExpense
Net income (loss) $ (4,133)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ (11,827)us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss $ 14,261us-gaap_EquityMethodInvestmentSummarizedFinancialInformationNetIncomeLoss