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Organization, Business and Basis of Presentation - Narrative (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019 USD ($) segment $ / shares	Mar. 31, 2018 USD ($) $ / shares	Dec. 31, 2018 USD ($)
Organization Consolidation and Presentation of Financial Statements [Line Items]
Number of business segments (segment) | segment	2
Checks issued and outstanding in excess of bank balance	$ 8,400		$ 0
Increase (decrease) in operating income	9,626	$ 8,407
Increase (decrease) in net income	$ 7,353	$ 5,644
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ 0.44	$ 0.34
Contract with customer, liability, cumulative catch-up adjustment to revenue, change in estimate of transaction price	$ 6,800	$ 16,100
Contracts Accounted for under Percentage of Completion [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Increase (decrease) in consolidated gross margin	(0.80%)	(0.10%)
Increase (decrease) in operating income	$ (4,000)	$ (300)
Increase (decrease) in net income	$ (1,500)	$ (200)
Increase (decrease) in diluted earnings per common share (in dollars per share) | $ / shares	$ (0.09)	$ (0.01)

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