Assumed achievement level

No definition available.

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB Topic 14.F)
-URI http://asc.fasb.org/extlink&oid=27013229&loc=d3e301413-122809

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5047-113901

Reference 3: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (h)(1)(i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Balance Type:	debit
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- Definition

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.

+ References

No definition available.

+ Details

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- Definition

Number of additional shares authorized for issuance under an established share-based compensation plan.

+ References

No definition available.

+ Details

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Period Type:	duration

- Definition

The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	instant

- Definition

Number of share instruments newly issued under a share-based compensation plan.

+ References

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Share-based Arrangements - Compensation Arrangements by Share-based Payment Award (Details) - USD ($) $ in Thousands		3 Months Ended
	Apr. 18, 2018	Mar. 30, 2018	Mar. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award
Stock compensation expense		$ 1,455	$ 1,381
2013 Management Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)		245,429
2013 Management Incentive Plan \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Number of additional shares authorized (in shares)	2,250,000
Number of shares available for grant (in shares)	2,495,429
ESPP
Share-based Compensation Arrangement by Share-based Payment Award
Number of shares available for grant (in shares)		156,822
ESPP \| Subsequent Event
Share-based Compensation Arrangement by Share-based Payment Award
Number of additional shares authorized (in shares)	500,000
Number of shares available for grant (in shares)	656,822
Awards Granted 2014 \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Assumed achievement level (as percent)		139.90%
Number of shares issued (in shares)		1,506
Awards Granted 2015 and 2016 \| Performance Shares
Share-based Compensation Arrangement by Share-based Payment Award
Assumed achievement level (as percent)		100.00%
Number of shares issued (in shares)		2,165