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Share Based Compensation - PSU (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jan. 08, 2021 | Sep. 28, 2021 | Sep. 29, 2020 | Sep. 28, 2021 | Sep. 29, 2020
Share-based Compensation |  |  |  |  |
Expense compensation |  | $ 10,980 | $ 7,580 | $ 30,797 | $ 22,070
PSUs |  |  |  |  |
Share-based Compensation |  |  |  |  |
Vesting period |  |  |  | 1 year |
Intrinsic value of awards vested (in dollars) |  | 0 | $ 0 | $ 400 | $ 5,400
Vested (in shares) | (5,199) |  |  |  |
Expense compensation |  | 1,800 |  | 5,900 |
Unrecognized compensation cost of unvested stock awards (in dollars) |  | $ 2,000 |  | $ 2,000 |
Unrecognized Compensation Cost Recognized Weighted Average Period |  |  |  | 3 months 18 days |

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- Definition Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + 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 (i) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition Period over which grantee's right to exercise award under share-based payment arrangement is no longer contingent on satisfaction of service or performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. Includes, but is not limited to, combination of market, performance or service condition. + 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 (a)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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- Definition The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period. + 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)(2) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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