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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
--- | ---
Mar. 31, 2013 | Mar. 31, 2012
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Impairment losses (recoveries) | $ 1,857 |  | $ (4,836) |
Exit Costs Included in Impairment Losses in Connection with Dispositions | 0 |  | (1,108) |
Discounted Cash Flow Valuation Technique [Member] |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Discount rate |  |  | 11.00% | [1]
Terminal capitalization rate |  |  | 9.00% | [1]
Market rent growth rate |  |  | 3.00% | [1]
Expense growth rate |  |  | 3.00% | [1]
Yield Analysis Valuation Technique [Member] |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Yield |  |  | 12.00% | [1]
Market rent rate (in dollars per square foot) |  |  | 8.50 | [1]
Leasing costs (in dollars per square foot) |  |  | 20.00 | [1]
Fair value measurement on a nonrecurring basis | Properties,net |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Impairment losses (recoveries) | 1,857 | [2] | 5,479 | [2],[3]
Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) | Properties,net |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Fair value on measurement date | 7,250 | [2],[4] | 92,176 | [2]
Exit Costs Included in Impairment Losses in Connection with Dispositions |  |  | 1,100 |
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties,net |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Fair value on measurement date | $ 7,250 | [2] | $ 92,176 | [2]
[1] | Only one value applied for this unobservable input.
[2] | Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[3] | Represents impairment losses, excluding exit costs incurred of $1.1 million.
[4] | This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness.

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- Definition Represents the expense growth rate , used as an input to measure the fair value. + References No definition available. + Details
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- Definition Represents the leasing costs per square foot, used as an input to measure fair value. + References No definition available. + Details
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- Definition Represents the market rent growth rate, used as an input to measure fair value. + References No definition available. + Details
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- Definition Represents the market rent rate, used as an input to measure fair value, per square foot, in dollars + References No definition available. + Details
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- Definition Represents the terminal capitalization rate, used as an input to measure the fair value. + References No definition available. + Details
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- Definition Represents the yield, used as an input to measure fair value. + References No definition available. + Details
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- Definition Represents the cash out flow for exit costs included in aggregate net impairment loss recognized during the period in connection with dispositions. + References No definition available. + Details
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- Definition The charge against earnings resulting from the aggregate write down of all assets from their carrying value to their fair value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=8077374&loc=d3e2420-110228 + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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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=7578670&loc=d3e19207-110258 + Details
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