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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
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Mar. 31, 2012
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| Assets and liabilities measured at fair value on a non-recurring basis | ||||||||||
| Impairment losses (recoveries) | $ 1,857 | $ (4,836) | ||||||||
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Properties,net | Fair value measurement on a nonrecurring basis
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| 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] | ||||||
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Properties,net | Fair value measurement on a nonrecurring basis | Significant Unobservable Inputs (Level 3)
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| Assets and liabilities measured at fair value on a non-recurring basis | ||||||||||
| Assets | 7,250 | [1],[3] | 92,176 | [1] | ||||||
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Properties,net | Fair value measurement on a nonrecurring basis | Total Estimated Fair Value
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| Assets and liabilities measured at fair value on a non-recurring basis | ||||||||||
| Assets | $ 7,250 | [1] | $ 92,176 | [1] | ||||||
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