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Summary of Significant Accounting Policies - Investment Properties (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Land $ 3,692,056 $ 3,673,023  
Buildings and improvements 33,664,683 32,994,937  
Total land, buildings and improvements 37,356,739 36,667,960  
Furniture, fixtures and equipment 447,756 424,710  
Investment properties at cost 37,804,495 37,092,670  
Less - accumulated depreciation 13,905,776 12,884,539  
Investment properties, at cost, net 23,898,719 24,208,131  
Construction in progress, included above 812,982 561,556  
Capitalized interest $ 33,342 $ 19,871 $ 24,754
Buildings and improvements | Minimum      
Useful life 10 years    
Buildings and improvements | Maximum      
Useful life 35 years    
Equipment and fixtures | Minimum      
Useful life 7 years    
Equipment and fixtures | Maximum      
Useful life 10 years