Organization, Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) $ / shares	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2020 USD ($) segment $ / shares	Jun. 30, 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	$ 100
Revenue recognized, related to change orders and claims included as contract price adjustments			40,100	21,400
Increase (decrease) in operating income	$ 19,342	$ 9,410	35,750	19,036
Increase (decrease) in net income	$ 13,385	$ 7,207	$ 23,317	$ 14,560
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.80	$ 0.43	$ 1.39	$ 0.87
Allowance for doubtful accounts associated with contract assets	$ 393		$ 393			$ 147
Retained Earnings (Accumulated Deficit)	$ 235,083		$ 235,083			$ 212,219
Accounting Standards Update 2016-13 [Member] | Adjustment
Organization Consolidation and Presentation of Financial Statements [Line Items]
Retained Earnings (Accumulated Deficit)					$ (268)
Contracts Accounted for under Percentage of Completion [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Increase (decrease) in consolidated gross margin	0.20%	(0.90%)	(0.10%)	(1.00%)
Increase (decrease) in operating income	$ 1,200	$ (4,200)	$ (700)	$ (9,100)
Increase (decrease) in net income	$ 900	$ (1,900)	$ (500)	$ (4,200)
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.05	$ (0.11)	$ (0.03)	$ (0.25)