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Real Estate and Accumulated Depreciation (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Investment in real estate:      
Balance at beginning of year $ 30,041,058 [1] $ 29,865,490 [1] $ 25,491,935
Acquisitions and development 1,276,636 2,834,279 5,076,830
Improvements 250,276 219,146 187,752
Deconsolidation of previously consolidated venture (144,897) 0 0
Impairment of assets (101,527) (37,207) (2,220)
Dispositions And other (1,203,247) (2,411,219) (491,396)
Foreign currency translation 415,879 (429,431) (397,411)
Other [2] 47,770 0 0
Balance at end of year [1] 30,581,948 30,041,058 29,865,490
Accumulated depreciation:      
Balance at beginning of year 4,093,494 3,796,297 3,020,908
Depreciation and amortization expenses 921,720 901,242 826,240
Amortization of above market leases 7,303 7,909 11,912
Disposition and other (192,029) (514,651) (111,199)
Foreign currency translation 7,882 (97,303) 48,436
Balance at end of year 4,838,370 $ 4,093,494 $ 3,796,297
Reconciliation of real property (Textual) [Abstract]      
Aggregate cost for tax purposes for real property $ 25,618,090    
[1]
The unaudited aggregate cost for tax purposes for real property equals $25,618,090,000 at December 31, 2017.
[2]
Primarily relates to the acquisition of an asset through foreclosure.