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
3 Months Ended
Mar. 31, 2012
Property Subject to or Available for Operating Lease [Line Items]  
April 1 through December 31, 2012 432,341
2013 524,171
2014 463,797
2015 394,113
2016 343,592
2017 and thereafter 1,299,559
Total 3,457,573
Tenant Leases [Member]
 
Property Subject to or Available for Operating Lease [Line Items]  
Operating leases with various expiration dates through year 2033