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Organization, Business and Basis of Presentation (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 10,357	$ 3,602	$ 18,764	$ 4,082
Net Income (Loss) Attributable to Parent	$ 6,835	$ 1,230	$ 12,479	$ 2,430
Earnings Per Share, Diluted	$ 0.41	$ 0.07	$ 0.75	$ 0.15
Revenues	$ 339,676		$ 685,287
Foreign Currency Transaction Gain (Loss)				$ 100
Significant Change Orders Or Claims [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Revenues			$ 6,700	$ 5,200
Estimate Adjustment [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage	0.10%	(2.10%)	0.10%	(1.00%)
Operating Income (Loss)	$ 200	$ (7,400)	$ 100	$ (6,800)
Net Income (Loss) Attributable to Parent	$ 200	$ (4,400)	$ 100	$ (4,100)
Earnings Per Share, Diluted	$ 0.01	$ (0.27)		$ (0.25)

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