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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2014 | Sep. 30, 2013
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses | $ 66 | $ 5,857 |  | $ 1,368 | $ 5,857 |
Exit costs on property dispositions |  |  |  | 0 | 186 |
Properties, net | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  | 21,888 | [1] | 1,371 | 30,940 | [1]
Properties, net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3) |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Exit costs on property dispositions |  | 186 |  |  | 186 |
Property Conveyances | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  | 10,400 |  |  |  |
Strategic Reallocation Plan | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Exit costs on property dispositions |  |  |  |  | 186 |
Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Number of properties with a shortened holding period (in properties) |  | 2 |  |  |  |
Greater Baltimore | Other Properties with Shortened Holding Periods | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  | 5,900 |  |  |  |
Discontinued Operations | Strategic Reallocation Plan | Fair value measurement on a nonrecurring basis |  |  |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |  |  |
Impairment losses |  |  |  |  | $ 14,800 |
[1] | Represents impairment losses, excluding exit costs incurred of $186,000 for the three months and nine months ended September 30, 2013.

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: 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=31042434&loc=d3e3602-108585 Reference 2: 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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