Goodwill and Intangible Assets, Goodwill (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Goodwill [Line Items]
Goodwill, Gross	$ 192,694	$ 192,694
Goodwill, Impaired, Accumulated Impairment Loss	(130,212)	(130,212)
Goodwill	62,482	62,482
Aerostructures [Member]
Goodwill [Line Items]
Goodwill, Gross	141,953	141,953
Goodwill, Impaired, Accumulated Impairment Loss	(79,471)	(79,471)
Goodwill	62,482	62,482
Engineering Services [Member]
Goodwill [Line Items]
Goodwill, Gross	50,741	50,741
Goodwill, Impaired, Accumulated Impairment Loss	(50,741)	(50,741)
Goodwill	$ 0	$ 0

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=6388280&loc=d3e13770-109266

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 45
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=64834752&loc=SL49117168-202975

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Amount before accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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Amount of accumulated impairment loss for an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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