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Commitments And Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Insurance receivable $ 57,490 $ 69,491  
Insurance Related Expenses [Roll Forward]      
Balance, beginning of period 641,779 709,798 $ 737,013
Reserves provided 90,863 83,912 83,209
Adjustment to self insurance reserves (81,131) (93,431) (49,437)
Payments (24,444) (58,500) (60,987)
Balance, end of period $ 627,067 $ 641,779 $ 709,798