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Commitments and Contingencies (Changes in Self-insurance Liability) (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Changes in Self-insurance Liability [Roll Forward]    
Balance, beginning of period $ 709,798 $ 737,013
Reserves provided 18,449 17,396
Adjustments to previously recorded reserves 1,300 (3,875)
Payments, net (10,375) (21,364)
Balance, end of period $ 719,172 $ 729,170