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Common Stock - Share-based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Dec. 30, 2017	Dec. 31, 2016	Jan. 02, 2016	May 03, 2017	Mar. 21, 2016
Share-Based Compensation
Adjustments Related to Tax Withholding for Share-based Compensation	$ 3,262	$ 1,880	$ 668
Common Stock Repurchases and Retirements
Share repurchase program, amount authorized to be repurchased				$ 20,000	$ 20,000
Number of shares repurchased and retired	554,708	783,703	477,292
Aggregate price of shares repurchased and retired	$ 19,528	$ 19,315	$ 12,806
Amount available for future repurchases	$ 9,500	$ 9,000	$ 8,100
Tender Offer
Number of common stock tendered in conjunction with a modified "Dutch Auction" self tender offer (in shares)		1,164
Purchased price for the common stock tendered in conjunction with a modified "Dutch Auction" self tender offer (dollar per share)		$ 19.75
Restricted stock
Share-Based Compensation
Vested (in shares)	211,320	201,905	106,504
Redemption of vested restricted shares in order to pay employee tax withholdings (in shares)	76,181	69,000	28,900
Adjustments Related to Tax Withholding for Share-based Compensation	$ 3,300	$ 1,900	$ 700

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The purchase price per each share of common stock tendered in connection with a modified "Dutch Auction" self tender offer.

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Number of shares tendered in connection with a modified "Dutch Auction" self tender offer. A tender offer is a broad solicitation by an Entity or a third party to purchase a substantial percentage of another entity's shares or units for a limited period of time. The offer is at a fixed price, usually at a premium over the current market price, and is contingent on shareholders' tendering a fixed number of their shares or units.

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The amount of adjustment to stockholders' equity associated with an employee's income tax withholding obligation as part of a net-share settlement of a share-based award.

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The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
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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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For net-share settlement of share-based awards when the employer settles employees' income tax withholding obligations, this element represents the number of shares the employees use to repay the employer.

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Amount of stock repurchase plan authorized.

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Amount remaining of a stock repurchase plan authorized.

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Number of shares that have been repurchased and retired during the period.

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Equity impact of the value of stock that has been repurchased and retired during the period. The excess of the purchase price over par value can be charged against retained earnings (once the excess is fully allocated to additional paid in capital).

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