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
9 Months Ended
Sep. 30, 2011
Tenant Leases [Abstract]  
October 1 through December 31, 2011 $ 149,754
2012 576,565
2013 503,946
2014 437,558
2015 367,644
2016 and thereafter 1,450,215
Total $ 3,485,682
Operating leases with various expiration dates through year 2033