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Property, Plant and Equipment and Leasehold Intangibles, Net (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross $ 8,952,446   $ 8,916,465
Accumulated depreciation and amortization (3,176,950)   (3,064,320)
Property, plant and equipment and leasehold intangibles, net 5,775,496   5,852,145
Depreciation and amortization expense 113,400 $ 126,600  
Land [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 452,677   449,295
Buildings and Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 4,941,781   4,923,621
Leasehold Improvements [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 130,337   124,850
Furniture and Equipment [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 1,035,909   1,006,889
Resident and Leasehold Operating Intangibles [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 597,828   594,748
Construction in Progress [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross 55,747   74,678
Assets Under Capital and Financing Leases [Member]      
Property, Plant and Equipment [Line Items]      
Property, plant and equipment and leasehold intangibles gross $ 1,738,167   $ 1,742,384