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Stockholders' Equity (Details) (USD $)
1 Months Ended 3 Months Ended 12 Months Ended
May 31, 2013
Jun. 30, 2014
Dec. 31, 2014
Rate
Dec. 31, 2013
Dec. 31, 2012
Apr. 14, 2014
May 13, 2013
Class of Stock [Line Items]              
Common Stock, Shares, Issued during a Period     26,700,000cuz_CommonStockSharesIssuedduringaPeriod 85,600,000cuz_CommonStockSharesIssuedduringaPeriod      
Preferred Stock, Shares Outstanding     0us-gaap_PreferredStockSharesOutstanding 3,791,000us-gaap_PreferredStockSharesOutstanding      
Preferred Stock, Dividend Rate, Percentage       7.50%us-gaap_PreferredStockDividendRatePercentage      
Preferred Stock, Liquidation Preference Per Share       $ 25us-gaap_PreferredStockLiquidationPreference      
Common Stock, Shares, Issued     220,078,986us-gaap_CommonStockSharesIssued 193,236,454us-gaap_CommonStockSharesIssued      
Proceeds from Issuance of Common Stock     $ 321,900,000us-gaap_ProceedsFromIssuanceOfCommonStock $ 826,200,000us-gaap_ProceedsFromIssuanceOfCommonStock      
Preferred Stock, Par or Stated Value Per Share     $ 1us-gaap_PreferredStockParOrStatedValuePerShare $ 1us-gaap_PreferredStockParOrStatedValuePerShare   $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare $ 1.00us-gaap_PreferredStockParOrStatedValuePerShare
Preferred Stock, Redemption Price Per Share           $ 25.00us-gaap_PreferredStockRedemptionPricePerShare $ 25.00us-gaap_PreferredStockRedemptionPricePerShare
Preferred Stock, Redemption Amount           94,800,000us-gaap_PreferredStockRedemptionAmount 74,800,000us-gaap_PreferredStockRedemptionAmount
Preferred Share Original Issuance Costs   (3,500,000)cuz_PreferredShareOriginalIssuanceCosts 3,530,000cuz_PreferredShareOriginalIssuanceCosts 2,656,000cuz_PreferredShareOriginalIssuanceCosts      
Preferred Stock, Redemption Amount, Reduction of Net Loss $ 2,700,000cuz_PreferredStockRedemptionAmountReductionofNetLoss            
Percentage of Restrictions on Ownership of Company Common and Preferred Stock     3.90%cuz_PercentageOfRestrictionsOnOwnershipOfCompanyCommonAndPreferredStock        
Document Fiscal Year Focus     2014 2013 2012