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Fair Value Measurements (Details 3) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2012 | Sep. 30, 2011 | Sep. 30, 2012 | Sep. 30, 2011
Fair value of impaired properties and other assets |  |  |  |  |  |
Exit Costs Included in Impairment Losses in Connection with Dispositions |  |  |  | $ (4,066) |  | $ 0
Impairment Losses Recognized | 46,096 |  | 0 | 41,260 |  | 42,983
Fair value measurement on a nonrecurring basis | Properties, net |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |
Impairment Losses Recognized | 52,900 | [1] |  | 60,593 | [1] |
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 | 2,900 |  |  | 4,200 |  |
Assets | 369,312 | [2],[3] |  | 369,312 | [2],[3] |
Fair value measurement on a nonrecurring basis | Total Estimated Fair Value | Properties, net |  |  |  |  |  |
Fair value of impaired properties and other assets |  |  |  |  |  |
Assets | $ 369,312 | [2] |  | $ 369,312 | [2] |
[1] | Represents impairment losses, excluding exit costs of $2.9 million for the three months ended September 30, 2012 and $4.2 million for the nine months ended September 30, 2012.
[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 from third party sources, subject to our corroboration for reasonableness.

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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 Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6390789&loc=d3e2420-110228 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 95 -Paragraph 28 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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 4: 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 + Details
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