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Convertible Senior Notes (Tables) | 12 Months Ended
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Dec. 31, 2023
Convertible Notes [Abstract] |
Convertible senior notes balances | The following table includes the outstanding principal amount and carrying value of the 2025 Notes as of the periods indicated:
(dollars in thousands) | DECEMBER 31, 2023 |  | DECEMBER 25, 2022
Principal | $ | 104,786 |  |  | $ | 105,000 |
Less: unamortized debt issuance costs | (1,138) |  |  | (1,939) |
Net carrying amount | $ | 103,648 |  |  | $ | 103,061 |
Convertible senior notes interest expense | Following is a summary of interest expense for the 2025 Notes, by component for the periods indicated:
| FISCAL YEAR
(dollars in thousands) | 2023 |  | 2022 |  | 2021
Coupon interest | $ | 5,242 |  |  | $ | 8,080 |  |  | $ | 11,500 |
Debt issuance cost amortization | 798 |  |  | 1,156 |  |  | 1,557 |
Total interest expense (1) | $ | 6,040 |  |  | $ | 9,236 |  |  | $ | 13,057 |
________________ (1)The effective rate of the 2025 Notes over their expected life is 5.85%.

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- Definition Convertible Notes + References No definition available. + Details
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- Definition Tabular disclosure of convertible debt instrument. Includes, but is not limited to, principal amount and amortized premium or discount. + References No definition available. + Details
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- Definition Tabular disclosure of interest income and expense, including, but not limited to, interest income and expense from investments, loans, and securities. + References No definition available. + Details
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