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Organization, Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2020 USD ($) segment $ / shares	Mar. 31, 2019 USD ($) $ / shares	Jan. 01, 2020 USD ($)	Dec. 31, 2019 USD ($)
Organization Consolidation and Presentation of Financial Statements [Line Items]
Number of business segments (segment) | segment	2
Foreign currency gains	$ 0	$ 0
Revenue recognized, related to change orders and claims included as contract price adjustments	36,400	6,800
Increase (decrease) in operating income	16,408	9,626
Increase (decrease) in net income	$ 9,932	$ 7,353
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.59	$ 0.44
Allowance for doubtful accounts associated with contract assets	$ 432			$ 147
Cumulative-effect adjustment to retained earnings	(268)
Retained Earnings [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cumulative-effect adjustment to retained earnings	$ (268)
Accounting Standards Update 2016-13 [Member] | Retained Earnings [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cumulative-effect adjustment to retained earnings			$ (300)
Contracts Accounted for under Percentage of Completion [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Increase (decrease) in consolidated gross margin	0.10%	(0.80%)
Increase (decrease) in operating income	$ 0	$ (4,000)
Increase (decrease) in net income	$ 0	$ (1,500)
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.00	$ 0.09

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