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Basis of Presentation and Significant Accounting Policies (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Property, Plant and Equipment [Line Items]
Allowance for doubtful accounts against contracts receivable	$ 0	$ 0
Contract receivables	43,824,000		$ 44,412,000
Contract liabilities, retainage	$ (35,832,000)		(33,856,000)
Percentage of receivables estimated to be collected in next fiscal year	69.00%
Contract liability recognized during period	$ 155,558,000
Contract liability revenue recognized		$ 146,266,000
Other current assets
Property, Plant and Equipment [Line Items]
Restricted cash, current	$ 5,800,000		$ 6,500,000

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