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Share-Based Compensation (Details) (USD $) Share data in Millions, except Per Share data, unless otherwise specified | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 24, 2014 | Sep. 25, 2013 | Sep. 24, 2014 | Sep. 25, 2013
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | $ 649,000 | $ 1,053,000 | $ 2,993,000 | $ 3,434,000
Stock options [Member] |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | 0 | 136,000 | 52,000 | 433,000
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 | 446,000 | 735,000 | 2,358,000 | 2,377,000
Restricted Stock Units [Abstract] |  |  |  |
Performance period |  |  | 3 years |
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 | 4,600,000 |  | 4,600,000 |
Unrecognized compensation cost, expected weighted average period |  |  | 1 year 9 months 11 days |
Restricted stock units for board members [Member] |  |  |  |
Total share-based compensation [Abstract] |  |  |  |
Total share-based compensation | 203,000 | 182,000 | 583,000 | 624,000
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 performance share awards outstanding | 400,000 |  | 400,000 |
Unrecognized compensation cost, expected weighted average period |  |  | 0 years 7 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 |
Minimum [Member] | Performance shares [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Minimum percentage of target awards to be earned (in hundredths) |  |  | 0.00% |
Maximum [Member] | Performance shares [Member] |  |  |  |
Restricted Stock Units [Abstract] |  |  |  |
Minimum percentage of target awards to be earned (in hundredths) |  |  | 200.00% |

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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 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5047-113901 Reference 2: 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 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=6415400&loc=d3e5070-113901 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Staff Accounting Bulletin (SAB) -Number Topic 14 -Section F + Details
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- Definition Aggregate cash paid by the entity during the period to settle equity instruments granted under equity-based payment arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (k) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested share-based awards, other than options, awarded to employees as compensation. + References No definition available. + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Percentage of vesting of share-based compensation awards. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition 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). + References 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)(1) -URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901 + Details
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- Definition Number of share instruments newly issued under a share-based compensation plan. + 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=6415400&loc=d3e5070-113901 + Details
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