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Share-Based Compensation (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 25, 2014	Jun. 26, 2013	Jun. 25, 2014	Jun. 26, 2013
Total share-based compensation [Abstract]
Total share-based compensation	$ 1,180,000	$ 1,206,000	$ 2,344,000	$ 2,381,000
Stock options [Member]
Total share-based compensation [Abstract]
Total share-based compensation	0	133,000	52,000	297,000
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested stock option awards outstanding	0		0
Performance shares [Member]
Total share-based compensation [Abstract]
Total share-based compensation	984,000	811,000	1,912,000	1,642,000
Restricted Stock Units [Abstract]
Performance period			3 years
Minimum percentage of target awards to be earned (in hundredths)			0.00%
Maximum percentage of target awards to be earned (in hundredths)			200.00%
Cash payments			1,100,000
Maximum common stock shares issued (in shares)			0.1
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested performance share awards outstanding	5,800,000		5,800,000
Unrecognized compensation cost, expected weighted average period			1 year 10 months 17 days
Restricted stock units [Member]
Total share-based compensation [Abstract]
Total share-based compensation	196,000	262,000	380,000	442,000
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.1
Equity awards, grant date fair value (in dollars per share)			$ 6.56
Maximum common stock shares issued (in shares)			0.1
Unrecognized compensation cost [Abstract]
Unrecognized compensation cost related to unvested restricted stock units outstanding	600,000		600,000
Unrecognized compensation cost related to unvested restricted stock units, expected weighted average period			0 years 10 months 0 days
Performance award granted February 2014 [Member] | Performance shares [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.2
Employee performance based target cash awards			2,200,000
Equity awards, grant date fair value (in dollars per share)			$ 7.65
Performance award granted April 2014 [Member] | Performance shares [Member]
Restricted Stock Units [Abstract]
Equity awards granted (in shares)			0.1
Employee performance based target cash awards			$ 300,000
Equity awards, grant date fair value (in dollars per share)			$ 6.80

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans for directors, 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 directors as compensation.

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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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Unrecognized cost of unvested 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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