Organization, Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022 USD ($) $ / shares	Jun. 30, 2021 USD ($) $ / shares	Jun. 30, 2022 USD ($) segment $ / shares	Jun. 30, 2021 USD ($) $ / shares
Organization Consolidation and Presentation of Financial Statements [Line Items]
Number of business segments (segment) | segment			2
Foreign currency gains (losses)			$ 0	$ (100)
Revenue recognized, related to change orders and claims included as contract price adjustments			12,500	6,000
Increase (decrease) in operating income	$ 26,245	$ 29,665	51,147	57,076
Increase (decrease) in net income	$ 19,684	$ 21,219	$ 40,372	$ 41,147
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 1.15	$ 1.24	$ 2.36	$ 2.41
Contracts Accounted for under Percentage of Completion
Organization Consolidation and Presentation of Financial Statements [Line Items]
Increase (decrease) in consolidated gross margin	(0.10%)	0.80%	0.30%	0.30%
Increase (decrease) in operating income	$ (500)	$ 5,100	$ 3,700	$ 3,900
Increase (decrease) in net income	$ (300)	$ 3,600	$ 2,500	$ 2,700
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ (0.02)	$ 0.21	$ 0.15	$ 0.16