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Fair Value Measurements (Quantitative Information About Significant Unobservable Inputs (Level 3) Used) (Details) (USD $)
In Thousands, unless otherwise specified
 0 Months Ended 12 Months Ended
Dec. 23, 2013
Dec. 31, 2014
Dec. 31, 2013
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate 7.75%us-gaap_FairValueInputsDiscountRate    
Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flows [Member] | Fixed-Rate Debt [Member] | Minimum [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate   1.30%us-gaap_FairValueInputsDiscountRate
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Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flows [Member] | Fixed-Rate Debt [Member] | Maximum [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate   5.10%us-gaap_FairValueInputsDiscountRate
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate   1.20%us-gaap_FairValueInputsDiscountRate
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate   2.90%us-gaap_FairValueInputsDiscountRate
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Significant Unobservable Inputs (Level 3) [Member] | Discounted Cash Flows [Member] | Notes Receivable From Real Estate Joint Ventures And Partnerships [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Discount Rate      2.70%us-gaap_FairValueInputsDiscountRate
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Fair Value Input, Expected Future Inflation Rate   2.00%us-gaap_FairValueAssumptionsExpectedVolatilityRate
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Nonrecurring [Member] | Impaired Property [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Property     11,876us-gaap_PropertyPlantAndEquipmentFairValueDisclosure
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
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Fair Value [Member] | Significant Unobservable Inputs (Level 3) [Member] | Fixed-Rate Debt [Member]      
Fair Value Inputs, Assets, Quantitative Information [Line Items]      
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
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Fair Value Inputs, Assets, Quantitative Information [Line Items]      
Investments   25,392us-gaap_HeldToMaturitySecuritiesFairValue
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[1] In accordance with our policy of evaluating and recording impairments on the disposal of long-lived assets, property with a carrying amount of $14.3 million was written down to a fair value of $11.9 million, resulting in a loss of $2.4 million, which was included in earnings for the period. Management’s estimate of the fair value of these properties was determined using bona fide purchase offers for the Level 2 inputs. See the quantitative information about the significant unobservable inputs used for our Level 3 fair value measurements table below.
[2] At December 31, 2014 and 2013, the credit loss balance on our tax increment revenue bonds was $31.0 million