Quarterly Financial Data Quarterly Financial Data (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended	12 Months Ended
Dec. 31, 2016	Oct. 01, 2016	Jul. 02, 2016	Apr. 02, 2016	Jan. 02, 2016	Oct. 03, 2015	Jul. 04, 2015	Apr. 04, 2015	Dec. 31, 2016	Jan. 02, 2016	Jan. 03, 2015
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenues	$ 129,515	$ 191,852	$ 251,599	$ 130,405	$ 130,205	$ 194,375	$ 253,177	$ 127,067	$ 703,371	$ 704,825	$ 675,751
Gross Profit	28,175	55,350	89,230	32,905	28,043	56,260	90,760	26,982	205,660	202,045	193,187
Selling, general and administrative expense	44,992	47,871	52,718	48,043	48,256	47,576	53,492	44,975	193,624	194,299	188,755
Operating Income (Loss)	(16,817)	7,479	36,512	(15,138)	(20,213)	8,684	37,268	(17,993)	12,036	7,746	4,432
Net Income (Loss) Attributable to Parent	$ (9,789)	$ 3,853	$ 21,584	$ (9,113)	$ (11,058)	$ 4,892	$ 20,945	$ (10,259)	$ 6,535	$ 4,520	$ 1,948
Earnings Per Share, Basic	$ (0.39)	$ 0.15	$ 0.87	$ (0.37)	$ (0.45)	$ 0.20	$ 0.85	$ (0.42)	$ 0.26	$ 0.18	$ 0.08
Earnings Per Share, Diluted	$ (0.39)	$ 0.15	$ 0.86	$ (0.37)	$ (0.45)	$ 0.20	$ 0.85	$ (0.42)	$ 0.26	$ 0.18	$ 0.08

The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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The amount of net income (loss) for the period available to each share of common stock or common unit outstanding during the reporting period and to each share or unit that would have been outstanding assuming the issuance of common shares or units for all dilutive potential common shares or units outstanding during the reporting period.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Aggregate revenue less cost of goods and services sold or operating expenses directly attributable to the revenue generation activity.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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The aggregate total costs related to selling a firm's product and services, as well as all other general and administrative expenses. Direct selling expenses (for example, credit, warranty, and advertising) are expenses that can be directly linked to the sale of specific products. Indirect selling expenses are expenses that cannot be directly linked to the sale of specific products, for example telephone expenses, Internet, and postal charges. General and administrative expenses include salaries of non-sales personnel, rent, utilities, communication, etc.

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