Annual report pursuant to Section 13 and 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, unless otherwise specified
12 Months Ended
Dec. 31, 2011
Tenant Leases [Abstract]  
2012 $ 581,668
2013 511,679
2014 449,777
2015 381,610
2016 329,344
2017 and thereafter 1,248,752
Total $ 3,502,830
Operating leases with various expiration dates through year 2033