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.

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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.

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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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Share-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands, shares in Millions	3 Months Ended		6 Months Ended
	Jul. 01, 2015	Jun. 25, 2014	Jul. 01, 2015	Jun. 25, 2014
Total share-based compensation [Abstract]
Total share-based compensation	$ 1,859	$ 1,180	$ 3,564	$ 2,344
Stock options [Member]
Total share-based compensation [Abstract]
Total share-based compensation	0	0	0	52
Performance shares [Member]
Total share-based compensation [Abstract]
Total share-based compensation	1,655	984	$ 3,178	1,912
Restricted Stock Units [Abstract]
Performance period			3 years
Cash payments			$ 3,400
Maximum common stock shares issued (in shares)			0.4
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested share awards outstanding	8,100		$ 8,100
Unrecognized compensation cost, expected weighted average period			1 year 11 months 17 days
Restricted stock units for board members [Member]
Total share-based compensation [Abstract]
Total share-based compensation	204	$ 196	$ 386	$ 380
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.1
Equity awards, grant date fair value (in dollars per share)			$ 10.60
Maximum common stock shares issued (in shares)			0.1
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested share awards outstanding	$ 700		$ 700
Unrecognized compensation cost, expected weighted average period			10 months
Minimum [Member] \| Performance shares [Member]
Restricted Stock Units [Abstract]
Percentage of target awards to be earned (in hundredths)			0.00%
Maximum [Member] \| Performance shares [Member]
Restricted Stock Units [Abstract]
Percentage of target awards to be earned (in hundredths)			150.00%
Performance shares that vest based on TSR [Member] \| Performance shares [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.2
Equity awards, grant date fair value (in dollars per share)			$ 11.86
Performance shares that vest based on EBITDA growth [Member] \| Performance shares [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.3
Equity awards, grant date fair value (in dollars per share)			$ 11.03