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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 652,686 $ 620,617 $ 627,067 $ 641,779
Reserves provided 31,134 21,569 74,676 64,018
Adjustments to previously recorded reserves (2,169) (1,349) 1,889 (56,567)
Payments, net (2,358) (16,175) (24,339) (24,568)
Balance, end of period $ 679,293 $ 624,662 $ 679,293 $ 624,662