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Summary Of Significant Accounting Policies (Redeemable Noncontrolling Interests) (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Rollforward of Redeemable Noncontrolling Interests      
Beginning balance $ 104,425us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 94,420us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount  
Net income 3,452us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 2,887us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest 2,592us-gaap_NetIncomeLossAttributableToRedeemableNoncontrollingInterest
Distributions & Redemptions (3,714)frt_RedeemableNoncontrollingInterestsDistributions (3,822)frt_RedeemableNoncontrollingInterestsDistributions  
Contributions 5,858frt_RedeemableNoncontrollingInterestsContributions 1,083frt_RedeemableNoncontrollingInterestsContributions  
Adjustment to redeemable noncontrolling interests 9,032us-gaap_TemporaryEquityOtherChanges 9,857us-gaap_TemporaryEquityOtherChanges  
Ending balance $ 119,053us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 104,425us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount $ 94,420us-gaap_RedeemableNoncontrollingInterestEquityCarryingAmount