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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts against contracts receivable	$ 0		$ 0		$ 0
Contract receivables	42,790,000		42,790,000		44,412,000
Contract liabilities, retainage	$ 41,925,000		$ 41,925,000		33,856,000
Percentage of receivables estimated to be collected in next fiscal year	66.00%		66.00%
Contract liability recognized during period	$ 111,887,000		$ 409,257,000
Contract liability revenue recognized		$ 106,072,000		$ 384,569,000
Restricted cash	6,714,000	$ 6,135,000	6,714,000	$ 6,135,000
Other current assets
Property, Plant and Equipment [Line Items]
Restricted cash	$ 6,714,000		$ 6,714,000		$ 6,457,000

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