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Property, Plant and Equipment and Leasehold Intangibles, Net (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
community
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
community
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles $ 8,339,706   $ 8,339,706   $ 8,589,429
Accumulated depreciation and amortization (3,967,634)   (3,967,634)   (4,053,727)
Property, plant and equipment and leasehold intangibles, net 4,372,072   4,372,072   4,535,702
Finance lease, right-of-use asset 29,900   29,900   98,400
Depreciation and amortization expense $ 85,900 $ 86,900 $ 255,300 $ 259,200  
Number Of underperforming communities | community 5   5    
Nonrecurring          
Property, Plant and Equipment [Line Items]          
Non-cash impairment charges $ 5,300 $ 3,800 $ 5,800 $ 5,900  
Land          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles 502,084   502,084   506,968
Buildings and improvements          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles 5,331,202   5,331,202   5,323,736
Furniture and equipment          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles 1,098,183   1,098,183   1,055,304
Resident and leasehold operating intangibles          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles 283,711   283,711   286,122
Construction in progress          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles 40,812   40,812   41,778
Assets under financing leases and leasehold improvements          
Property, Plant and Equipment [Line Items]          
Property, plant and equipment and leasehold intangibles $ 1,083,714   $ 1,083,714   $ 1,375,521