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Fair Value Measurements (Details 3) (USD $) | 12 Months Ended
--- | ---
Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011
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
Fair value measurement on a nonrecurring basis | Projects in development or held for future development |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses |  |  | 1,900,000 |  |
Fair value measurement on a nonrecurring basis | Property Conveyances |  |  |  |  |
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 |  |  |  |
Fair value measurement on a nonrecurring basis | Other Properties with Shortened Holding Periods |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Number of properties, shortened holding period | 2 |  |  |  |
Fair value measurement on a nonrecurring basis | Strategic Reallocation Plan |  |  |  |  |
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 |  |  |  |
Fair value measurement on a nonrecurring basis | Additional Property Disposed |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses |  |  | 5,100,000 |  |
Fair value measurement on a nonrecurring basis | Properties, Net |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses | 31,068,000 | [1] | 62,702,000 | [2],[3] |
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Exit costs included in impairment losses in connection with dispositions | 979,000 |  |  |  |
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Strategic Reallocation Plan |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Exit costs included in impairment losses in connection with dispositions |  |  | 4,200,000 |  |
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties, Net |  |  |  |  |
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] |
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties, Net |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Assets | 4,459,000 |  | 173,949,000 | [2] |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow |  |  |  |  |
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] |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Significant Unobservable Inputs (Level 3) | Properties, Net |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Assets | 4,459,000 |  | 166,650,000 |  |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Minimum |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Discount rate |  |  | 10.00% |  |
Terminal capitalization rate |  |  | 8.70% |  |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Maximum |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Discount rate |  |  | 11.00% |  |
Terminal capitalization rate |  |  | 10.00% |  |
Fair value measurement on a nonrecurring basis | Discounted Cash Flow | Weighted Average |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Discount rate |  |  | 10.30% |  |
Terminal capitalization rate |  |  | 8.90% |  |
Fair value measurement on a nonrecurring basis | Yield Analysis Valuation Technique |  |  |  |  |
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] |
Fair value measurement on a nonrecurring basis | Yield Analysis Valuation Technique | Significant Unobservable Inputs (Level 3) | Properties, Net |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Assets |  |  | 2,356,000 |  |
Fair value measurement on a nonrecurring basis | Discontinued Operations | Strategic Reallocation Plan |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses | 15,200,000 |  | 23,200,000 |  |
Fair value measurement on a nonrecurring basis | Greater Baltimore | Other Properties with Shortened Holding Periods |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses | 5,900,000 |  |  |  |
Fair value measurement on a nonrecurring basis | Greater Philadelphia |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses |  |  | 46,100,000 |  |
Future expenditure redevelopment |  |  | 25,000,000 |  |
Fair value measurement on a nonrecurring basis | Colorado Springs | Strategic Reallocation Plan |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |
Impairment losses |  |  | $ 6,900,000 |  |
[1] | Represents aggregate impairment losses on non recurring fair value measurements resulting in impairment losses, excluding exit costs incurred of $979,000.
[2] | Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[3] | Represents aggregate impairment losses on non recurring fair value measurements resulting in impairment losses, excluding exit costs incurred of $4.2 million.
[4] | Only one value applied for this unobservable input.

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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bbb) -URI http://asc.fasb.org/extlink&oid=25499696&loc=d3e19207-110258 + Details
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