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REAL ESTATE AND ACCUMULATED DEPRECIATION (Details 2) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Estimated useful lives      
Aggregate cost of total real estate for federal income tax purposes $ 23,903,081    
Changes in total real estate assets      
Balance, beginning of period 23,962,222 $ 23,606,872 $ 22,342,576
Acquisitions, construction costs and improvements 1,588,314 860,594 1,615,949
Dispositions, including impairment loss on planned dispositions (623,231) (505,244) (351,653)
Balance, end of period 24,927,305 23,962,222 23,606,872
Changes in accumulated depreciation      
Balance, beginning of period 5,728,440 5,173,883 4,611,646
Depreciation, including discontinued operations 758,596 707,331 661,578
Dispositions (269,315) (152,774) (99,341)
Balance, end of period $ 6,217,721 $ 5,728,440 $ 5,173,883
Building      
Estimated useful lives      
Estimated useful lives of assets (in years) 30 years    
Improvements, upgrades and FF&E      
Estimated useful lives      
Estimated useful lives of assets (in years) 7 years