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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The aggregate cost of goods produced and sold and services rendered during the reporting period.

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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Net income after adjustments for dividends on preferred stock (declared in the period) and/or cumulative preferred stock (accumulated for the period).

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The net amount of other income and expense amounts, the components of which are not separately disclosed on the income statement, resulting from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business) also known as other nonoperating income (expense) recognized for the period. Such amounts may include: (a) dividends, (b) interest on securities, (c) net gains or losses on securities, (d) unusual costs, (e) gains or losses on foreign exchange transactions, and (f) miscellaneous other income and expense items.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Summary of Significant Accounting Policies (Details 4) (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
Selling and commissions		4,064us-gaap_SellingAndMarketingExpense	3,452us-gaap_SellingAndMarketingExpense	3,095us-gaap_SellingAndMarketingExpense					6,547us-gaap_SellingAndMarketingExpense	10,398us-gaap_SellingAndMarketingExpense	14,142us-gaap_SellingAndMarketingExpense	13,117us-gaap_SellingAndMarketingExpense	13,780us-gaap_SellingAndMarketingExpense
Research and development		1,714us-gaap_ResearchAndDevelopmentExpense	1,481us-gaap_ResearchAndDevelopmentExpense	820us-gaap_ResearchAndDevelopmentExpense					2,301us-gaap_ResearchAndDevelopmentExpense	4,015us-gaap_ResearchAndDevelopmentExpense	6,126us-gaap_ResearchAndDevelopmentExpense	4,747us-gaap_ResearchAndDevelopmentExpense	5,578us-gaap_ResearchAndDevelopmentExpense
General and administrative		3,896us-gaap_GeneralAndAdministrativeExpense	3,015us-gaap_GeneralAndAdministrativeExpense	3,730us-gaap_GeneralAndAdministrativeExpense					6,745us-gaap_GeneralAndAdministrativeExpense	10,641us-gaap_GeneralAndAdministrativeExpense	15,289us-gaap_GeneralAndAdministrativeExpense	14,285us-gaap_GeneralAndAdministrativeExpense	13,098us-gaap_GeneralAndAdministrativeExpense
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
Selling and commissions		221	(130)	(79)					(209)	12	(1)
Research and development		4	1	1					2	6	(1)
General and administrative		10	(222)	5					(217)	(207)	(8)
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 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		(208)	(23)
Cost of sales		(168)	65	14
Gross profit		(40)	(88)	(14)
Selling and commissions		221	(130)	(79)
Research and development		4	1	1
General and administrative		10	(222)	5
Business development		463	169	75
Operating income		(738)	94	(16)
Other (income) / expense		(440)	(192)	(75)
Income tax expense		(10)	57
Net income (loss)		$ (288)	$ 229	$ 59