Business development involves the development of products and services, their delivery, design and their implementation. Business development includes a number of techniques designed to grow an economic enterprise. Such techniques include, but are not limited to, assessments of marketing opportunities and target markets, intelligence gathering on customers and competitors, generating leads for possible sales, follow-up sales activity, formal proposal writing and business model design. Business development involves evaluating a business and then realizing its full potential, using such tools as marketing, sales, information management and customer service.

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Summary of Significant Accounting Policies (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								6 Months Ended	9 Months Ended	12 Months Ended
	Dec. 31, 2013	Sep. 29, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Jun. 30, 2013	Sep. 29, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Effects of the revision on Consolidated Statements of Operations
Net sales	$ 69,792us-gaap_SalesRevenueNet	$ 73,030us-gaap_SalesRevenueNet	$ 64,212us-gaap_SalesRevenueNet	$ 63,849us-gaap_SalesRevenueNet	$ 67,371us-gaap_SalesRevenueNet	$ 56,555us-gaap_SalesRevenueNet	$ 45,837us-gaap_SalesRevenueNet	$ 43,853us-gaap_SalesRevenueNet	$ 128,061us-gaap_SalesRevenueNet	$ 201,165us-gaap_SalesRevenueNet	$ 270,883us-gaap_SalesRevenueNet	$ 213,616us-gaap_SalesRevenueNet	$ 208,816us-gaap_SalesRevenueNet
Cost of sales	47,683us-gaap_CostOfRevenue	58,487us-gaap_CostOfRevenue	45,830us-gaap_CostOfRevenue	45,112us-gaap_CostOfRevenue					90,942us-gaap_CostOfRevenue	149,642us-gaap_CostOfRevenue	197,112us-gaap_CostOfRevenue	162,622us-gaap_CostOfRevenue	143,851us-gaap_CostOfRevenue
Gross profit	22,109us-gaap_GrossProfit	14,543us-gaap_GrossProfit	18,382us-gaap_GrossProfit	18,737us-gaap_GrossProfit	18,221us-gaap_GrossProfit	16,310us-gaap_GrossProfit	8,720us-gaap_GrossProfit	7,743us-gaap_GrossProfit	37,119us-gaap_GrossProfit	51,523us-gaap_GrossProfit	73,771us-gaap_GrossProfit	50,994us-gaap_GrossProfit	64,965us-gaap_GrossProfit
Business development	(132)us-gaap_BusinessDevelopment	463us-gaap_BusinessDevelopment	169us-gaap_BusinessDevelopment	75us-gaap_BusinessDevelopment	746us-gaap_BusinessDevelopment	100us-gaap_BusinessDevelopment		35us-gaap_BusinessDevelopment	244us-gaap_BusinessDevelopment	707us-gaap_BusinessDevelopment	575us-gaap_BusinessDevelopment	881us-gaap_BusinessDevelopment	504us-gaap_BusinessDevelopment
Operating income		18,578us-gaap_OperatingIncomeLoss	9,849us-gaap_OperatingIncomeLoss	11,017us-gaap_OperatingIncomeLoss					20,866us-gaap_OperatingIncomeLoss	39,518us-gaap_OperatingIncomeLoss	50,974us-gaap_OperatingIncomeLoss	17,964us-gaap_OperatingIncomeLoss	32,005us-gaap_OperatingIncomeLoss
Other (income) expense		(306)us-gaap_OtherNonoperatingIncomeExpense	685us-gaap_OtherNonoperatingIncomeExpense	787us-gaap_OtherNonoperatingIncomeExpense					1,472us-gaap_OtherNonoperatingIncomeExpense	1,092us-gaap_OtherNonoperatingIncomeExpense	1,216us-gaap_OtherNonoperatingIncomeExpense	1,572us-gaap_OtherNonoperatingIncomeExpense	459us-gaap_OtherNonoperatingIncomeExpense
Income tax expense		(208)us-gaap_IncomeTaxExpenseBenefit	78us-gaap_IncomeTaxExpenseBenefit	681us-gaap_IncomeTaxExpenseBenefit					759us-gaap_IncomeTaxExpenseBenefit	551us-gaap_IncomeTaxExpenseBenefit	1,636us-gaap_IncomeTaxExpenseBenefit	1,815us-gaap_IncomeTaxExpenseBenefit	3,171us-gaap_IncomeTaxExpenseBenefit
Net income (loss)		10,857	4,387	5,129					9,516	20,373	22,867	(6,858)	4,988
Adjustments
Effects of the revision on Consolidated Statements of Operations
Net sales		(208)	(23)						(23)	(231)	(7,065)	262
Cost of sales		(168)	65	14					79	(89)	(4,129)
Gross profit		(40)	(88)	(14)					(102)	(142)	(2,936)	262
Business development		463	169	75					244	707	575	881	504
Operating income		(738)	94	(16)					78	(660)	(3,501)	(619)	(504)
Other (income) expense		440	192	75					267	707	575	881	504
Income tax expense		(10)	57						57	47	(59)	65
Net income (loss)		(288)	229	59					288		(2,867)	197
Impact of correcting error related to the M240 Program, previously recorded immaterial out-of-period adjustments and the reclassification of business development expenses \| Adjustments
Effects of the revision on Consolidated Statements of Operations
Net sales											(7,065)	262
Cost of sales											(4,129)
Gross profit											(2,936)	262
Business development											(575)	(881)	(504)
Operating income											(3,501)	(619)	(504)
Other (income) expense											(575)	(881)	(504)
Income tax expense											(59)	65
Net income (loss)											(2,867)	197
Impact of a contract modification related to the M240 machine gun program
Effects of the revision on Consolidated Statements of Operations
Net sales	(6,820)
Cost of sales	3,381
Impact of a contract modification related to the M240 machine gun program \| Adjustments
Effects of the revision on Consolidated Statements of Operations
Net sales											(6,820)
Cost of sales											3,381
Net income (loss)											(2,700)
Impact of a contract obligation expense related to the M240 machine gun program
Effects of the revision on Consolidated Statements of Operations
Net sales	(3,700)
Error related to reclassification of business development expenses \| Adjustments
Effects of the revision on Consolidated Statements of Operations
Net sales												262
Business development											$ 575	$ 881