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
9 Months Ended
Sep. 30, 2012
Property Subject to or Available for Operating Lease [Line Items]  
October 1 through December 31, 2012 146,372
2013 555,291
2014 489,914
2015 420,352
2016 370,374
2017 and thereafter 1,438,568
Total 3,420,871
Tenant Leases [Member]
 
Property Subject to or Available for Operating Lease [Line Items]  
Operating leases with various expiration dates through year Mar. 31, 2033