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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 28, 2019 | Sep. 29, 2018 | Sep. 28, 2019 | Sep. 29, 2018
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock-based compensation expense recognized |  | $ 867 | $ 778 | $ 5,293 | $ 4,039
Unrecognized Compensation Cost |  | $ 3,912 |  | $ 3,912 |
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 [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock-based compensation expense recognized |  | $ 867 | 778 | $ 5,116 | 3,825
Unrecognized Compensation Cost |  | $ 3,912 |  | $ 3,912 |
Weighted Average Remaining Amortization Periods |  |  |  | 10 months 24 days |
Number of units [Abstract] |  |  |  |  |
Outstanding (in shares) |  |  |  | 904,000 |
Granted (in shares) |  |  |  | 314,000 |
Vested (in shares) | [1] |  |  | (361,000) |
Cancelled or forfeited (in shares) |  |  |  | (15,000) |
Outstanding (in shares) |  | 842,000 |  | 842,000 |
Expected to vest (in shares) |  | 842,000 |  | 842,000 |
Weighted Average Grant-date Fair Value per Unit [Abstract] |  |  |  |  |
Outstanding (in dollars per share) |  |  |  | $ 14.77 |
Granted (in dollars per share) |  |  |  | 19.85 |
Vested (in dollars per share) | [1] |  |  | 11.70 |
Cancelled or forfeited (in dollars per share) |  |  |  | 17.71 |
Outstanding (in dollars per share) |  | $ 17.93 |  | $ 17.93 |
Phantom Stock Units [Member] |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award |  |  |  |  |
Stock-based compensation expense recognized |  | $ 0 | $ 0 | $ 177 | $ 214
Unrecognized Compensation Cost |  | $ 0 |  | $ 0 |
Weighted Average Remaining Amortization Periods |  |  |  | 0 years |
Number of units [Abstract] |  |  |  |  |
Outstanding (in shares) |  |  |  | 170,000 |
Granted (in shares) |  |  |  | 10,000 |
Dividend equivalents issued (in shares) |  |  |  | 3,000 |
Outstanding (in shares) |  | 183,000 |  | 183,000 |
Weighted Average Grant-date Fair Value per Unit [Abstract] |  |  |  |  |
Granted (in dollars per share) |  |  |  | $ 17.72 |
Scheduled to Vest January 1, 2020 [Member] | Performance Vested Restricted Stock Units [Member] |  |  |  |  |
Number of units [Abstract] |  |  |  |  |
Outstanding (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] |  |  |  |  |
Number of units [Abstract] |  |  |  |  |
Outstanding (in shares) |  | 141,000 |  | 141,000 |
Expected to vest (in shares) |  | 141,000 |  | 141,000 |
Not expected to vest (in shares) |  | 0 |  | 0 |
Scheduled to Vest January 1, 2022 [Member] | Performance Vested Restricted Stock Units [Member] |  |  |  |  |
Number of units [Abstract] |  |  |  |  |
Outstanding (in shares) |  | 174,000 |  | 174,000 |
Expected to vest (in shares) |  | 174,000 |  | 174,000 |
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 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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&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://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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- Definition Per share or unit weighted-average fair value of nonvested award under share-based payment arrangement. Excludes share and unit options. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=116856206&loc=d3e5070-113901 + Details
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