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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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 9,142	$ 13,024	$ 12,449	$ 24,621
Net Income (Loss) Attributable to Parent	$ 5,500	$ 8,074	$ 7,487	$ 15,246
Earnings Per Share, Diluted	$ 0.31	$ 0.38	$ 0.40	$ 0.72
Foreign Currency Transaction Gain (Loss), Realized			$ 200
Contracts Accounted for under Percentage of Completion [Member] | Cost Estimate Revision [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Cost Estimate Revision Gross Margin Increase (Decrease) Percentage	0.10%	1.00%	(0.70%)	1.10%
Estimate Adjustment [Member]
Organization Consolidation and Presentation of Financial Statements [Line Items]
Operating Income (Loss)	$ 200	$ 2,700	$ (3,700)	$ 5,700
Net Income (Loss) Attributable to Parent	$ 100	$ 1,700	$ (2,300)	$ 3,600
Earnings Per Share, Diluted	$ 0.01	$ 0.08	$ (0.12)	$ 0.17

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