Organization, Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Jan. 02, 2018	Dec. 31, 2017
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 8,407	$ 480
Net Income (Loss) Attributable to Parent	$ 5,644	$ 1,200
Earnings Per Share, Diluted	$ 0.34	$ 0.07
Revenues	$ 345,611
Retained Earnings (Accumulated Deficit)	149,320			$ 143,241
Significant Change Orders Or Claims [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Revenues	$ 16,100
Restatement Adjustment [Member] | Accounting Standards Update 2014-09 [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Retained Earnings (Accumulated Deficit)			$ 700
Estimate Adjustment [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage	(0.10%)	0.40%
Operating Income (Loss)	$ (300)	$ 1,100
Net Income (Loss) Attributable to Parent	$ (200)	$ 600
Earnings Per Share, Diluted	$ (0.01)	$ 0.04