Commitments And Contingencies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 321,100	$ 312,700
Surety Bonds Outstanding	2,900,000	2,400,000
Self-insurance liabilities	$ 267,474	$ 563,103	$ 635,857	$ 627,067
Incurred but not reported percentage of liability reserves	68.00%	77.00%
Adjustment to self insurance reserves	$ (333,853)	$ (130,841)	(64,965)
Right-of-use assets	93,895	77,400
Operating Lease, Liability	109,021	91,554
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	37,200	20,600
Operating Lease, Payments	23,100	23,400	21,900
Variable Lease, Cost	12,900	11,800	9,900
Short-term Lease, Cost	24,100	17,300	21,200
Lease, Cost	66,200	56,400	$ 54,800
Unsecured Letter Of Credit Facility [Member]
Loss Contingencies [Line Items]
Letters of credit outstanding, amount	$ 321,100	$ 312,700