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Organization, Business and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019 USD ($) $ / shares	Jun. 30, 2018 USD ($) $ / shares	Jun. 30, 2019 USD ($) segment $ / shares	Jun. 30, 2018 USD ($) $ / shares
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Number of business segments (segment) | segment			2
Foreign currency transaction gains (losses)			$ 100	$ 0
Revenue recognized related to change orders and claims			21,400	6,700
Increase (decrease) in operating income	$ 9,410	$ 10,357	19,036	18,764
Increase (decrease) in net income	$ 7,207	$ 6,835	$ 14,560	$ 12,479
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.43	$ 0.41	$ 0.87	$ 0.75
Contracts Accounted for under Percentage of Completion [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Increase (decrease) in consolidated gross margin	(0.90%)	0.10%	(1.00%)	0.10%
Increase (decrease) in operating income	$ (4,200)	$ 200	$ (9,100)	$ 100
Increase (decrease) in net income	$ (1,900)	$ 200	$ (4,200)	$ 100
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ (0.11)	$ 0.01	$ (0.25)	$ 0

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