Quarterly report pursuant to Section 13 or 15(d)

Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details)

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Tenant Leases (Future Minimum Rentals To Be Received Under Non-Cancelable Operating Leases) (Details) (USD $)
In Thousands
6 Months Ended
Jun. 30, 2011
Tenant Leases  
July 1 through December 31, 2011 $ 296,893
2012 565,575
2013 493,813
2014 428,475
2015 358,208
2016 and thereafter 1,372,781
Total $ 3,515,745
Operating leases with various expiration dates through year 2033