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Commitments and Contingencies (Narrative) (Details) - USD ($)			3 Months Ended	6 Months Ended
	Apr. 24, 2023	Apr. 11, 2022	Jun. 30, 2023	Jun. 30, 2023
Commitments And Contingencies [Line Items]
Outstanding performance bonds			$ 865,428,000	$ 865,428,000
Revenue value remaining from outstanding performance bonds			371,275,000	371,275,000
One-time payment amount	$ 1,250,000
Disbursement amount from litigation escrow account	680,000
Expected funds to be released in connection with pre-purchase construction project	$ 800,000
Benefit in cost of contract revenues			2,410,000
Other income related to settlement			784,000
Indemnification Commitment [Member]
Commitments And Contingencies [Line Items]
Aggregate demolition surety performance bond		$ 21,934,000
Minimum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			1,000,000	$ 1,000,000
Warranty periods				1 year
Maximum [Member]
Commitments And Contingencies [Line Items]
Bids bond range			$ 10,000,000	$ 10,000,000
Warranty periods				3 years