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Supplemental Balance Sheet Information (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Accounts Payable and Accrued Liabilities, Current [Abstract]    
Salaries and wages $ 65,310 $ 86,476
Insurance reserves 64,633 63,230
Paid time off 37,848 37,415
Deferred payroll taxes (Note 3) 36,336 0
Real estate taxes 25,495 25,979
Interest 11,453 16,196
Accrued utilities 7,507 7,601
Taxes payable 3,806 1,360
Other 35,463 28,446
Total 287,851 266,703
Other Assets, Noncurrent [Abstract]    
Health care licenses 34,060 35,198
Lease security deposit 3,180 49,102
Other 19,019 34,431
Total $ 56,259 $ 118,731