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Property: (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
Dec. 31, 2011
Property:          
Land $ 1,227,504   $ 1,227,504   $ 1,273,649
Building improvements 5,226,712   5,226,712   5,440,394
Tenant improvements 439,861   439,861   442,862
Equipment and furnishings 123,271   123,271   123,098
Construction in progress 347,882   347,882   209,732
Total 7,365,230   7,365,230   7,489,735
Less accumulated depreciation (1,420,223)   (1,420,223)   (1,410,692)
Property, net 5,945,007   5,945,007   6,079,043
Depreciation expenses $ 57,615 $ 51,323 $ 114,937 $ 101,660