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Organization, Business and Basis of Presentation (Details) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019 USD ($) $ / shares	Sep. 30, 2018 USD ($) $ / shares	Sep. 30, 2019 USD ($) segment $ / shares	Sep. 30, 2018 USD ($) $ / shares
Organization Consolidation and Presentation of Financial Statements [Line Items]
Number of business segments (segment) | segment			2
Foreign currency gains			$ 100	$ 0
Contract with customer, liability, cumulative catch-up adjustment to revenue, change in estimate of transaction price			31,100	8,800
Increase (decrease) in operating income	$ 17,262	$ 14,137	36,298	32,901
Increase (decrease) in net income	$ 10,355	$ 7,957	$ 24,915	$ 20,436
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.62	$ 0.48	$ 1.49	$ 1.23
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%	(0.60%)	(0.50%)	(0.40%)
Increase (decrease) in operating income	$ 900	$ (2,100)	$ (7,800)	$ (3,900)
Increase (decrease) in net income	$ 800	$ (1,600)	$ (3,300)	$ (2,800)
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.05	$ (0.09)	$ (0.20)	$ (0.17)

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