Cash, Cash Equivalents, and Restricted Cash (Narrative) (Details) - USD ($)	Mar. 31, 2024	Dec. 31, 2023
Restricted Cash And Cash Equivalents Items [Line Items]
Surety, payment and performance bonds	$ 41,900,000	$ 42,000,000.0
Collateral payment for performance bonds	0	0
Workers Compensation Policy [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Collateral	2,400,000	2,400,000
Payment and Performance Bonds [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Collateral	$ 6,100,000	$ 6,100,000