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           Tenant Leases (Tables) 
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        6 Months Ended | ||||||||||||||||||
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           Jun. 30, 2011 
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| Tenant Leases | |||||||||||||||||||
| Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases | 
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| X | ||||||||||
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- Definition 
          Schedule Of Future Minimum Rentals Under Non-cancelable Operating Lease [Text Block] 
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| X | ||||||||||
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- Definition 
          Tenant Leases [Abstract] 
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