Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2015 segment	Mar. 31, 2014
Segment Reporting [Abstract]
Number of reportable segments	2
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	$ 92,475	$ 95,751
Income from operations	4,313	3,689
Aerostructures [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	79,245	77,704
Income from operations	5,055	2,807
Engineering Services [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	13,504	18,706
Income from operations	(764)	946
Eliminations [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	(274)	(659)
Income from operations	$ 22	$ (64)