Quarterly report pursuant to Section 13 or 15(d)

Tenant Leases (Details)

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Tenant Leases (Details) (USD $)
In Thousands, unless otherwise specified
6 Months Ended
Jun. 30, 2012
Property Subject to or Available for Operating Lease [Line Items]  
July 1 through December 31, 2012 289,690
2013 545,825
2014 480,072
2015 408,954
2016 358,341
2017 and thereafter 1,389,960
Total 3,472,842
Tenant Leases [Member]
 
Property Subject to or Available for Operating Lease [Line Items]  
Operating leases with various expiration dates through year Mar. 31, 2033