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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 29, 2018 | Sep. 30, 2017 | Sep. 29, 2018 | Sep. 30, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  | $ 778 | $ 676 | $ 4,039 | $ 3,719
Unrecognized Compensation Cost |  | $ 3,838 |  | $ 3,838 |
Expiration date of the 2007 stock incentive plan |  |  |  | May 20, 2024 |
Maximum number of shares granted under restricted stock, unrestricted stock, RSU's and stock options to officers, employees and employee directors (in shares) |  | 6,500,000 |  | 6,500,000 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  | $ 778 | 676 | $ 3,825 | 3,556
Unrecognized Compensation Cost |  | $ 3,838 |  | $ 3,838 |
Weighted Average Remaining Amortization Periods |  |  |  | 1 year 2 months 12 days |
Equity Awards Other Than Options Outstanding: |  |  |  |  |
Balance (in shares) |  |  |  | 986,000 |
Balance (in dollars per share) |  |  |  | $ 13.34 |
Granted (in shares) |  |  |  | 252,000 |
Granted (in dollars per share) |  |  |  | $ 18.90 |
Vested (in shares) | [1] |  |  | (334,000) |
Vested (in dollars per share) | [1] |  |  | $ 13.67 |
Cancelled or forfeited (in shares) |  |  |  | 0 |
Cancelled or forfeited (in dollars per share) |  |  |  | $ 0 |
Balance (in shares) |  | 904,000 |  | 904,000 |
Balance (in dollars per share) |  | $ 14.77 |  | $ 14.77 |
Expected to vest (in shares) |  | 904,000 |  | 904,000 |
Phantom Share Units (PSUs) [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |
Stock-based compensation expense recognized |  | $ 0 | $ 0 | $ 214 | $ 163
Unrecognized Compensation Cost |  | $ 0 |  | $ 0 |
Weighted Average Remaining Amortization Periods |  |  |  | 0 years |
Equity Awards Other Than Options Outstanding: |  |  |  |  |
Balance (in shares) |  |  |  | 157,000 |
Granted (in shares) |  |  |  | 10,000 |
Granted (in dollars per share) |  |  |  | $ 21.35 |
Dividend equivalents issued |  |  |  | 2,000 |
Balance (in shares) |  | 169,000 |  | 169,000 |
Scheduled to Vest January 1, 2019 [Member] | Performance Vested Restricted Stock Units [Member] |  |  |  |  |
Equity Awards Other Than Options Outstanding: |  |  |  |  |
Balance (in shares) |  | 213,000 |  | 213,000 |
Expected to vest (in shares) |  | 213,000 |  | 213,000 |
Not expected to vest (in shares) |  | 0 |  | 0 |
Scheduled to Vest January 1, 2020 [Member] | Performance Vested Restricted Stock Units [Member] |  |  |  |  |
Equity Awards Other Than Options Outstanding: |  |  |  |  |
Balance (in shares) |  | 167,000 |  | 167,000 |
Expected to vest (in shares) |  | 167,000 |  | 167,000 |
Not expected to vest (in shares) |  | 0 |  | 0 |
Scheduled to Vest January 1, 2021 [Member] | Performance Vested Restricted Stock Units [Member] |  |  |  |  |
Equity Awards Other Than Options Outstanding: |  |  |  |  |
Balance (in shares) |  | 141,000 |  | 141,000 |
Expected to vest (in shares) |  | 141,000 |  | 141,000 |
Not expected to vest (in shares) |  | 0 |  | 0 |
[1] | The number of RSUs vested includes shares that the Company withheld on behalf of employees to satisfy the statutory tax withholding requirements.

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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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- 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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period. + 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)(1)(iv)(3) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition Weighted average fair value as of the grant date of equity-based award plans other than stock (unit) option plans that were not exercised or put into effect as a result of the occurrence of a terminating event. + 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)(3) -URI http://asc.fasb.org/extlink&oid=96867065&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=96867065&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=96867065&loc=d3e5070-113901 + Details
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- Definition The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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- Definition The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units. + 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)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901 + Details
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