CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended															12 Months Ended
	Dec. 31, 2016		Sep. 30, 2016	Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2015		Sep. 30, 2015		Jun. 30, 2015		Mar. 31, 2015		Dec. 31, 2016		Dec. 31, 2015	Dec. 31, 2014
Sales and service revenue
Product sales																$ 308,089		$ 323,611	$ 321,284
Service revenues																38,091		51,485	66,533
Net sales	$ 85,183		$ 89,673	$ 83,993		$ 87,331		$ 89,438		$ 95,633		$ 97,550		$ 92,475		346,180		375,096	387,817
Cost of sales and service revenue
Cost of product sales																249,227		259,610	254,775
Cost of service revenues																37,150		46,700	57,672
Cost of sales																286,377		306,310	312,447
Gross profit	12,192	[1]	15,846	15,535		16,230		16,193	[2]	16,626	[3]	18,770		17,197		59,803		68,786	75,370
Selling, general and administrative expenses																44,541		45,678	55,204
Goodwill and intangible asset impairment																28,368		0	26,439
Restructuring expense																1,212		2,322	2,585
(Loss) income from operations																(14,318)	[4]	20,786	(8,858)	[4]
Other income (expense):
Interest expense																(21,171)		(22,439)	(29,280)	[5]
Other, net																(352)		(236)	223
Total other expense																(21,523)		(22,675)	(29,057)
Loss before income taxes																(35,841)		(1,889)	(37,915)
(Benefit) provision for income taxes																(734)		352	(8,953)
Net loss	$ (3,757)	[1]	$ 309	$ (29,900)	[6]	$ (1,759)	[7]	$ (1,188)	[2]	$ 34	[3]	$ 378	[8]	$ (1,465)	[9]	(35,107)		(2,241)	(28,962)
Other comprehensive income (loss):
Change in foreign currency translation adjustment																(71)		(41)	(98)
Reclassification adjustment for losses on interest rate hedges included in net earnings, net of tax of $0, $0 and $157																0		0	278
Unrealized gain/(loss) arising during period from interest rate hedges, net of tax of $0, $0 and $(157)																			278
Total comprehensive loss																$ (35,178)		$ (2,282)	$ (28,782)
Amounts per common share:
Net (loss) income per common share (in dollars per share)	$ (0.29)		$ 0.02	$ (2.28)		$ (0.14)		$ (0.09)		$ 0.00		$ 0.03		$ (0.11)		$ (2.68)		$ (0.17)	$ (2.28)
Net (loss) income per common share assuming dilution (in dollars per share)	$ (0.29)		$ 0.02	$ (2.28)		$ (0.14)		$ (0.09)		$ 0.00		$ 0.03		$ (0.11)		$ (2.68)		$ (0.17)	$ (2.28)
Weighted average common shares outstanding (in shares)																13,113,901		12,869,353	12,716,976
Weighted average dilutive common shares outstanding (in shares)																13,113,901		12,869,353	12,716,976

[1] Gross profit in the fourth quarter of 2016 includes an unfavorable cumulative catch-up adjustment of $1,741 related to a long-term contract.

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

[3] 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 also included a net gain of $3,325 related to a legal settlement and $1,575 of restructuring expenses.

[4] Includes charges of $4,066 for intangible asset impairment and $24,302 for goodwill impairment in 2016. Includes charges of $26,439 for goodwill impairment in 2014.

[5] Includes $8,466 related to the write-off of deferred financing costs and $793 related to the settlement of debt derivatives associated with the Company's refinancing of its debt in 2014.

[6] Included in the net loss for the the second quarter of 2016 was a $28,368 charge for goodwill and intangible asset impairment related to the Engineering Services reporting unit and $241 of restructuring expenses.

[7] Included in the net loss for the the first quarter of 2016 were $947 of restructuring expenses.

[8] Included in the net income 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.