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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jun. 28, 2017	Jun. 29, 2016	Jun. 28, 2017	Jun. 29, 2016
Total share-based compensation [Abstract]
Total share-based compensation	$ 2,080	$ 1,902	$ 4,053	$ 3,850
Performance shares [Member]
Total share-based compensation [Abstract]
Total share-based compensation	1,904	1,688	$ 3,844	3,422
Restricted Stock Units [Abstract]
Performance period, equity award			3 years
Cash payments			$ 3,900
Maximum common stock shares issued (in shares)			0.4
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested share awards outstanding	11,400		$ 11,400
Unrecognized compensation cost, expected weighted average period			1 year 11 months 8 days
Performance shares [Member] | Minimum [Member]
Restricted Stock Units [Abstract]
Percentage of target awards to be earned (in hundredths)			0.00%
Performance shares [Member] | Maximum [Member]
Restricted Stock Units [Abstract]
Percentage of target awards to be earned (in hundredths)			150.00%
Performance shares [Member] | Performance shares that vest based on TSR [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.3
Equity awards, grant date fair value (in dollars per share)			$ 13.05
Performance shares [Member] | Performance shares that vest based on EBITDA growth [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.3
Equity awards, grant date fair value (in dollars per share)			$ 12.17
Restricted stock units for board members [Member]
Total share-based compensation [Abstract]
Total share-based compensation	176	$ 214	$ 209	$ 428
Restricted Stock Units [Abstract]
Equity awards granted (in shares)		0.1
Equity awards, grant date fair value (in dollars per share)		$ 12.04
Performance period, equity award			1 year
Cash payments related to replacement cash awards	500		$ 500
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested share awards outstanding	$ 1,000		$ 1,000
Unrecognized compensation cost, expected weighted average period			1 year 1 month 2 days

X

- 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)
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-Publisher FASB
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Amount of commitment made to pay deferred cash remuneration.

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Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation.

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Estimated period over which an employee is required to provide service in exchange for the equity-based payment award, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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

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Percentage of vesting of share-based compensation awards.

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