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Fair Value Measurements (Details 3) (USD $)
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12 Months Ended | ||||||||||||
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Dec. 31, 2013
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Dec. 31, 2012
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Dec. 31, 2011
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | $ 5,857,000 | $ 43,678,000 | $ 83,213,000 | ||||||||||
| Exit costs included in impairment losses in connection with dispositions | 979,000 | 4,146,000 | 0 | ||||||||||
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Fair value measurement on a nonrecurring basis | Projects in development or held for future development
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 1,900,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Property Conveyances
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 11,000,000 | ||||||||||||
| Exit costs included in impairment losses in connection with dispositions | 560,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Other Properties with Shortened Holding Periods
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| Fair value of impaired properties and other assets | |||||||||||||
| Number of properties, shortened holding period | 2 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Strategic Reallocation Plan
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 19,000,000 | ||||||||||||
| Exit costs included in impairment losses in connection with dispositions | 419,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Additional Property Disposed
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 5,100,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Properties, Net
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 31,068,000 | [1] | 62,702,000 | [2],[3] | |||||||||
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Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
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| Fair value of impaired properties and other assets | |||||||||||||
| Exit costs included in impairment losses in connection with dispositions | 979,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Strategic Reallocation Plan
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| Fair value of impaired properties and other assets | |||||||||||||
| Exit costs included in impairment losses in connection with dispositions | 4,200,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, Net
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| Fair value of impaired properties and other assets | |||||||||||||
| Exit costs included in impairment losses in connection with dispositions | 4,200,000 | ||||||||||||
| Assets | 4,459,000 | 173,949,000 | [2] | ||||||||||
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Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties, Net
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| Fair value of impaired properties and other assets | |||||||||||||
| Assets | 4,459,000 | 173,949,000 | [2] | ||||||||||
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Fair value measurement on a nonrecurring basis | Discounted Cash Flow
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| Fair value of impaired properties and other assets | |||||||||||||
| Discount rate | 10.00% | [4] | |||||||||||
| Terminal capitalization rate | 9.50% | [4] | |||||||||||
| Market rent growth rate | 3.00% | [4] | 3.00% | [4] | |||||||||
| Expense growth rate | 3.00% | [4] | 3.00% | [4] | |||||||||
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Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Properties, Net
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| Fair value of impaired properties and other assets | |||||||||||||
| Assets | 4,459,000 | 166,650,000 | |||||||||||
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Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Minimum
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| Fair value of impaired properties and other assets | |||||||||||||
| Discount rate | 10.00% | ||||||||||||
| Terminal capitalization rate | 8.70% | ||||||||||||
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Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Maximum
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| Fair value of impaired properties and other assets | |||||||||||||
| Discount rate | 11.00% | ||||||||||||
| Terminal capitalization rate | 10.00% | ||||||||||||
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Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Weighted Average
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| Fair value of impaired properties and other assets | |||||||||||||
| Discount rate | 10.30% | ||||||||||||
| Terminal capitalization rate | 8.90% | ||||||||||||
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Fair value measurement on a nonrecurring basis | Yield Analysis Valuation Technique
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| Fair value of impaired properties and other assets | |||||||||||||
| Fair value inputs yield | 12.00% | [4] | |||||||||||
| Fair value inputs market rent rate per square foot | 8.50 | [4] | |||||||||||
| Fair value inputs leasing costs per square foot | 20.00 | [4] | |||||||||||
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Fair value measurement on a nonrecurring basis | Yield Analysis Valuation Technique | Significant Unobservable Inputs (Level 3) | Properties, Net
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| Fair value of impaired properties and other assets | |||||||||||||
| Assets | 2,356,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Discontinued Operations | Strategic Reallocation Plan
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 15,200,000 | 23,200,000 | |||||||||||
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Fair value measurement on a nonrecurring basis | Greater Baltimore | Other Properties with Shortened Holding Periods
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 5,900,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Greater Philadelphia
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | 46,100,000 | ||||||||||||
| Future expenditure redevelopment | 25,000,000 | ||||||||||||
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Fair value measurement on a nonrecurring basis | Colorado Springs | Strategic Reallocation Plan
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| Fair value of impaired properties and other assets | |||||||||||||
| Impairment losses | $ 6,900,000 | ||||||||||||
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