Subsequent Events (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012
Subsequent Event [Line Items]
Tenant leases	$ 18,901,061
Tenant Leases Remaining in Current Year [Member]
Subsequent Event [Line Items]
Tenant leases	894,128
Tenant Leases 2013 [Member]
Subsequent Event [Line Items]
Tenant leases	1,806,638
Tenant Leases 2014 [Member]
Subsequent Event [Line Items]
Tenant leases	1,703,343
Tenant Leases 2015 [Member]
Subsequent Event [Line Items]
Tenant leases	1,710,320
Tenant Leases 2016 [Member]
Subsequent Event [Line Items]
Tenant leases	1,663,397
Tenant Leases Thereafter [Member]
Subsequent Event [Line Items]
Tenant leases	$ 11,123,235