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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Changes in Self-insurance Liability [Roll Forward]        
Balance, beginning of period $ 620,617 $ 640,014 $ 641,779 $ 709,798
Reserves provided 21,569 21,992 64,018 60,618
Adjustments to previously recorded reserves (1,349) 0 (56,567) (59,362)
Payments, net (16,175) (9,460) (24,568) (58,508)
Balance, end of period $ 624,662 $ 652,546 $ 624,662 $ 652,546