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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 644,278 $ 653,068 $ 627,067 $ 641,779
Reserves provided 23,705 22,907 43,542 42,449
Adjustments to previously recorded reserves 1,919 (49,136) 4,058 (55,218)
Payments, net (17,216) (6,222) (21,981) (8,393)
Balance, end of period $ 652,686 $ 620,617 $ 652,686 $ 620,617