Business Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014 segment	Jun. 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	$ 105,937	$ 105,465	$ 201,688	$ 211,531
Income from operations	4,229	11,471	7,918	17,544
Aerostructures [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	88,482	84,755	166,187	167,769
Income from operations	3,315	15,651	6,123	21,079
Engineering Services [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	17,814	21,521	36,520	45,167
Income from operations	936	(4,325)	1,882	(3,676)
Eliminations [Member]
Information about reported segments on the basis used internally to evaluate segment performance [Abstract]
Net sales	(359)	(811)	(1,019)	(1,405)
Income from operations	$ (22)	$ 145	$ (87)	$ 141