ACCOUNTING POLICIES, CHANGE IN ACCOUNTING ESTIMATE (Details) - USD ($) $ in Thousands		3 Months Ended		12 Months Ended
		Sep. 30, 2014	Dec. 31, 2013	Dec. 31, 2016		Dec. 31, 2015		Dec. 31, 2014	Dec. 31, 2013
Change in Accounting Estimate [Line Items]
Impairment loss on goodwill				$ 24,302	[1]	$ 0	[2]
revenue from claims and unpriced change orders				933
Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Favorable adjustments				1,342		1,308		$ 5,720
Unfavorable adjustments				(2,483)		(2,954)		(1,719)
Change in Accounting Estimate, Amount, Unfavorable Financial Effect on Operating Income, Net				(1,141)		(1,646)
Change in Accounting Estimate, Amount, Favorable Financial Effect on Operating Income, Net								4,001
Mitsubishi Regional Jet [Member] [Member] | Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Unfavorable adjustments				(1,903)		(2,763)		(1,479)
Anticipated Forward Loss on Long-term Contract				$ 722		$ 476
B-737 [Member] | Contracts Accounted for under Percentage of Completion [Member]
Change in Accounting Estimate [Line Items]
Favorable adjustments		$ 5,267						$ 5,267
Valent Aerostructures, LLC [Member]
Change in Accounting Estimate [Line Items]
Impairment loss on goodwill	[2]								$ 73,528
Adjustment to loss provision on long-term production contract			$ 5,267

[1] The Company performed its annual impairment analysis of goodwill related to the Aerostructures reporting units during the fourth quarter of 2016 and determined no adjustments to the carrying value were necessary. The value of the goodwill relating to the Engineering Services reporting unit was deemed impaired during 2016 and a $24,302 impairment charge was recorded in the Consolidated Statements of Comprehensive Income (Loss) for the year ended December 31, 2016.

[2] The Company performed its annual impairment analysis of goodwill during the fourth quarter of 2015 and determined no adjustments to the carrying value were necessary.