Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014 segment	Sep. 30, 2013
Segment Reporting [Abstract]
Number of reportable segments			2
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	$ 97,335	$ 104,656	$ 299,023	$ 316,187
Income from operations	6,663	6,635	14,580	24,179
Aerostructures [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	82,914	85,075	249,101	252,844
Income from operations	7,888	6,015	14,010	27,095
Engineering Services [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	14,714	20,206	51,235	65,373
Income from operations	(1,216)	742	666	(2,933)
Eliminations [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	(293)	(625)	(1,313)	(2,030)
Income from operations	$ (9)	$ (122)	$ (96)	$ 17