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Property: (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Property, Plant and Equipment [Abstract]    
Land $ 2,242,841 $ 2,242,291
Buildings and improvements 9,517,554 9,479,337
Tenant improvements 618,630 600,436
Equipment and furnishings 160,045 152,554
Construction in progress 363,570 303,264
Total 12,902,640 12,777,882
Less accumulated depreciation (1,856,213) (1,709,992)
Property, net $ 11,046,427 $ 11,067,890