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Revenue from Customers - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating income (Loss)
Disaggregation of Revenue [Line Items]
Estimated construction gain (loss) before tax	$ 7,439	$ (9,044)	$ 7,098
Costs and Estimated Earnings in Excess of Billings
Disaggregation of Revenue [Line Items]
Provision for estimated loss on uncompleted contracts	$ 7,142	$ 3,000

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- Definition

Represents net estimated gross profit (loss) before tax.

+ References

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- Definition

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+ References

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- Definition

Amount of cost incurred on construction contract for unapproved change order, claim, or similar item subject to uncertainty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 910
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=6471471&loc=d3e48698-109348

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