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           Fair Value Measurements (Details 3) (Significant Unobservable Inputs (Level 3), USD $) 
        In Thousands, unless otherwise specified  | 
        3 Months Ended | ||
|---|---|---|---|
| 
           Mar. 31, 2014
 
          Fair value measurement on a recurring basis
 
          Redeemable Non-Controlling Interest 
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           Mar. 31, 2013
 
          Properties,net
 
          Fair value measurement on a nonrecurring basis 
         | 
        
           Mar. 31, 2013
 
          Properties,net
 
          Fair value measurement on a nonrecurring basis
 
          Bids for property indicative of value 
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| Quantitative information for significant unobservable inputs used for Level 3 fair value measurements | |||
| Fair value inputs, discount rate | 15.50% | ||
| Fair value on measurement date | $ 7,250 | $ 7,250 | |
| X | ||||||||||
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- Definition 
          Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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- Details 
          
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| X | ||||||||||
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- Definition 
          Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. Reference 1: http://www.xbrl.org/2003/role/presentationRef 
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