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Fair Value Measurements (Details 2) (Fair value measurement on a nonrecurring basis, Properties,net, USD $) In Thousands, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013
Assets and liabilities measured at fair value on a non-recurring basis |
Impairment losses (recoveries) | $ 1,857
Significant Unobservable Inputs (Level 3) |
Assets and liabilities measured at fair value on a non-recurring basis |
Assets | 7,250
Total Estimated Fair Value |
Assets and liabilities measured at fair value on a non-recurring basis |
Assets | $ 7,250

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