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Fair Value Measurements Fair Value Measurements (Details 2) (USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Impairment losses (recoveries) | $ 1,857 |  | $ (4,836) |
Properties,net | Fair value measurement on a nonrecurring basis |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Asset Impairment Charges, Continuing and Noncontinuing Operations Including Exit Costs | 1,900 |  |  |
Impairment losses (recoveries) | 1,857 | [1] | 5,479 | [1],[2]
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 |  |  |  |
Assets | 7,250 | [1],[3] | 92,176 | [1]
Properties,net | Fair value measurement on a nonrecurring basis | Total Estimated Fair Value |  |  |  |
Assets and liabilities measured at fair value on a non-recurring basis |  |  |  |
Assets | $ 7,250 | [1] | $ 92,176 | [1]
[1] | Reflects balance sheet classifications of assets at time of fair value measurement, excluding the effect of held for sale classifications.
[2] | Represents impairment losses, excluding exit costs incurred of $1.1 million.
[3] | This fair value measurement was developed by a third party source, subject to our corroboration for reasonableness.

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- Definition The charge against earnings from continuing and noncontinuing operations resulting from the aggregate write down of all assets from their carrying value to their fair value. + 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-Name Statement of Financial Accounting Standard (FAS) -Number 144 -Paragraph 45, 46, 47 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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