CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ 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
Sales and service revenue
Product sales																	$ 323,611	$ 321,284		$ 324,133
Service revenues																	51,485	66,533		88,424
Net sales	$ 89,438		$ 95,633		$ 97,550		$ 92,475		$ 88,794		$ 97,335		$ 105,937		$ 95,751		375,096	387,817		412,557
Cost of sales and service revenue
Cost of product sales																	259,610	254,775		255,261
Cost of service revenues																	46,700	57,672		77,434
Cost of sales																	306,310	312,447		332,695
Gross profit	16,193	[1]	16,626	[2]	18,770		17,197		16,732		22,043	[3]	19,134		17,461		68,786	75,370		79,862
Selling, general and administrative expenses																	45,678	55,204		55,862
Goodwill and intangible asset impairment																	0	26,439		77,750
Contingent consideration write-off																	0	0		(7,950)
Restructuring expense																	2,322	2,585		3,073
Acquisitions expense																	0	0		247
Income (loss) from operations																	20,786	(8,858)	[4]	(49,120)	[5],[6],[7]
Other income (expense):
Interest expense																	(22,439)	(29,280)		(16,962)
Other, net																	(236)	223		618
Total other expense																	(22,675)	(29,057)		(16,344)
Loss before income taxes																	(1,889)	(37,915)		(65,464)
Provision (benefit) for income taxes									(6,396)								352	(8,953)		(6,979)
Net loss	$ (1,188)	[1]	$ 34	[2]	$ 378	[8]	$ (1,465)	[9]	$ (22,505)	[10]	$ 1,396	[3]	$ (7,411)	[11]	$ (442)	[12]	(2,241)	(28,962)		(58,485)
Other comprehensive income (loss):
Change in foreign currency translation adjustment																	(41)	(98)		(23)
Reclassification adjustment for losses on interest rate hedges included in net earnings, net of tax of $0, $157 and $0																	0	278		0
Unrealized gain/(loss) arising during period from interest rate hedges, net of tax of $0, $0 and $(157)																	0	0		(278)
Total comprehensive loss																	$ (2,282)	$ (28,782)		$ (58,786)
Amounts per common share:
Net (loss) income per common share (in dollars per share)	$ (0.09)	[1]	$ 0.00	[2]	$ 0.03	[8]	$ (0.11)	[9]	$ (1.76)	[10]	$ 0.11	[3]	$ (0.58)	[11]	$ (0.03)	[12]	$ (0.17)	$ (2.28)		$ (4.64)
Net (loss) income per common share assuming dilution (in dollars per share)	$ (0.09)	[1]	$ 0.00	[2]	$ 0.03	[8]	$ (0.11)	[9]	$ (1.76)	[10]	$ 0.11	[3]	$ (0.58)	[11]	$ (0.03)	[12]	$ (0.17)	$ (2.28)		$ (4.64)
Weighted average common shares outstanding (in shares)																	12,869,353	12,716,976		12,607,833
Weighted average dilutive common shares outstanding (in shares)																	12,869,353	12,716,976		12,607,833

[1] 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.

[2] 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.

[3] 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.

[4] Includes a charge of $26,439 for goodwill impairment in 2014.

[5] Includes a benefit of $7,950 related to the write-off of contingent consideration in 2013.

[6] Includes a charge of $4,222 for impairment of intangible assets in 2013.

[7] Includes a charge of $73,528 for goodwill impairment in 2013.

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

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

[10] 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.

[11] 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.

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