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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 9 Months Ended
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Sep. 30, 2013 | Sep. 30, 2012
Discounted Cash Flow Valuation Technique [Member] |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Discount rate | 10.90% |  | 10.40% |
Terminal capitalization rate | 9.70% |  | 8.90% |
Market rent growth rate | 3.00% | [1] | 3.00% | [1]
Expense growth rate | 3.00% | [1] | 3.00% | [1]
Discounted Cash Flow Valuation Technique [Member] | Minimum |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Discount rate | 10.00% |  | 10.10% |
Terminal capitalization rate | 9.50% |  | 8.70% |
Discounted Cash Flow Valuation Technique [Member] | Maximum |  |  |  |
Quantitative information for significant unobservable inputs used for Level 3 fair value measurements |  |  |  |
Discount rate | 11.00% |  | 11.00% |
Terminal capitalization rate | 10.00% |  | 10.00% |
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 | 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 | $ 245,535 | [2],[3] | $ 369,312 | [2],[3]
[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] | These fair value measurements were developed as a result of negotiations between us and potential, or actual, purchasers of properties.

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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 Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + 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=25499696&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=25499696&loc=d3e19207-110258 + Details
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