QUARTERLY FINANCIAL DATA (UNAUDITED) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended																12 Months Ended
	Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2014		Sep. 30, 2014		Jun. 30, 2014		Mar. 31, 2014		Dec. 31, 2015		Dec. 31, 2014		Dec. 31, 2013
Restructuring and Related Cost, Incurred Cost	$ 46		$ (1,575)		$ (518)		$ (275)				$ (765)		$ (1,095)		$ (428)
Loss on Contracts	1,010		1,738
Gain (Loss) Related to Litigation Settlement			3,325
Change in Accounting Estimate, Amount, Favorable Financial Effect on Operating Income											5,286
Impairment loss on goodwill									$ 26,439								$ 0	[1]	$ 26,439	[2]	$ 73,528	[2]
Derivative, Loss on Derivative													793						793
Debt issuance cost write-off													8,340				0		8,466		0
Income Tax Expense (Benefit)									6,396								(352)		8,953		6,979
Selected Quarterly Financial Information [Abstract]
Net sales	89,438		95,633		97,550		92,475		88,794		97,335		105,937		95,751		375,096		387,817		412,557
Gross profit	16,193	[3]	16,626	[4]	18,770		17,197		16,732		22,043	[5]	19,134		17,461		68,786		75,370		79,862
Net income (loss)	$ (1,188)	[3]	$ 34	[4]	$ 378	[6]	$ (1,465)	[7]	$ (22,505)	[8]	$ 1,396	[5]	$ (7,411)	[9]	$ (442)	[10]	$ (2,241)		$ (28,962)		$ (58,485)
Amounts per common share:
Net income (loss) (in dollars per share)	$ (0.09)	[3]	$ 0.00	[4]	$ 0.03	[6]	$ (0.11)	[7]	$ (1.76)	[8]	$ 0.11	[5]	$ (0.58)	[9]	$ (0.03)	[10]	$ (0.17)		$ (2.28)		$ (4.64)
Net income (loss) - assuming dilution (in dollars per share)	$ (0.09)	[3]	$ 0.00	[4]	$ 0.03	[6]	$ (0.11)	[7]	$ (1.76)	[8]	$ 0.11	[5]	$ (0.58)	[9]	$ (0.03)	[10]	$ (0.17)		$ (2.28)		$ (4.64)
Selling, General and Administrative Expenses [Member] | Employee Severance [Member]
Restructuring and Related Cost, Incurred Cost									$ (297)

[1] 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.

[2] During the fourth quarter of 2014, the Company performed its annual impairment analysis of goodwill. As a result of the analysis, the goodwill related to the Engineering Services reporting unit was deemed impaired, and a $26,439 impairment charge was recorded in the Consolidated Statements of Comprehensive Income (Loss) for the year ended December 31, 2014.

[3] Gross profit in the fourth quarter of 2015 includes an unfavorable forward loss reserve adjustment of $1,010 related to a long-term contract. Net loss for the fourth quarter of 2015 includes a restructuring benefit of $46.

[4] Gross profit in the third quarter of 2015 includes an unfavorable adjustment of $1,738 related to a long-term contract for which a forward loss reserve was established. Net income for the the third quarter of 2015 included a net gain of $3,325 related to a legal settlement and $1,575 of restructuring expenses.

[5] Gross profit in the third quarter of 2014 includes a $5,286 favorable cumulative catch-up adjustment related to the settlement of an unpriced change order and the Company's ability to secure more favorable future material pricing on a long-term production contract. In addition, net income in the third quarter of 2014 includes $765 of restructuring expenses.

[6] Included in the net loss for the the second quarter of 2015 were $518 of restructuring expenses.

[7] Included in the net loss for the the first quarter of 2015 were $275 of restructuring expenses.

[8] Net loss in the fourth quarter of 2014 includes a $26,439 goodwill impairment charge related to the Engineering Services reporting unit, $297 of restructuring expenses and a $6,396 income tax benefit resulting from the decision to carry the 2014 tax loss back to previous years.

[9] Net loss in the second quarter of 2014 includes $793 of interest expense related to the termination of interest rate derivatives and $8,340 related to the write-off of debt issuance costs associated with the modification of the Company's revolving credit facility and the termination of its long-term credit agreement. Net loss in the second quarter of 2014 also includes $1,095 of restructuring expenses.

[10] Included in the net loss for the the first quarter of 2014 were $428 of restructuring expenses.