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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Dec. 31, 2021
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts against contracts receivable	$ 0		$ 0
Contract receivables	33,016,000		47,308,000
Contract liabilities, retainage	$ 66,361,000		46,882,000
Percentage of receivables estimated to be collected in next fiscal year	64.00%
Contract liability recognized during period	$ 227,079,000
Contract liability revenue recognized		$ 155,558,000
Restricted cash	6,990,000	$ 5,827,000
Other current assets
Property, Plant and Equipment [Line Items]
Restricted cash	$ 6,990,000		$ 6,853,000

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