Cash, Cash Equivalents, and Restricted Cash (Narrative) (Details) - USD ($)	Mar. 31, 2025	Dec. 31, 2024
Restricted Cash And Cash Equivalents Items [Line Items]
Surety, payment and performance bonds	$ 42,700,000	$ 42,500,000
Collateral payment for performance bonds	0	0
Workers Compensation Policy [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Collateral	2,900,000	2,500,000
2019-1C Tower Securities [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Collateral		1,165,000,000
Payment and Performance Bonds [Member]
Restricted Cash And Cash Equivalents Items [Line Items]
Collateral	$ 6,700,000	$ 6,400,000