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v3.21.2

Long-Term Debt (Details) $ / shares in Units, $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jul. 03, 2021 USD ($) $ / shares | Jul. 04, 2020 USD ($) | Jul. 03, 2021 USD ($) $ / shares | Jul. 04, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instruments [Abstract] |  |  |  |  |
Credit facility | $ 0 |  | $ 0 |  | $ 0
Deferred financing costs | (11,313) |  | (11,313) |  | (11,512)
Long-term debt | 454,031 |  | 454,031 |  | 394,886
Less current portion | 0 |  | 0 |  | 0
Long-term debt, less current portion | 454,031 |  | 454,031 |  | 394,886
Interest expense [Abstract] |  |  |  |  |
Contractual coupon interest |  | $ 3,282 |  | $ 6,701 |
Non-cash amortization of debt discount |  | 3,488 | 0 | 7,125 |
Other non-cash interest expense (income) |  | 435 |  | 889 |
Total interest expense related to the debentures |  | 7,205 |  | 14,715 |
Purchase price of extinguished debt |  |  | 300 | 90,525 |
Loss on extinguishment of debt, including the write-off of portion of unamortized debt issuance costs | 0 | (1,146) | 0 | (4,066) |
Convertible Senior Notes, Due 2025 [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Convertible debt | $ 465,344 |  | $ 465,344 |  | 406,268
Issuance date |  |  | Jun. 12, 2018 |  |
Debt maturity date |  |  | Jun. 15, 2025 |  |
Cash coupon rate | 2.25% |  | 2.25% |  |
Nonconvertible debt borrowing rate at issuance | 5.50% |  | 5.50% |  |
Effective conversion rate |  |  | 31.9104 |  |
Effective conversion price (in dollars per share) | $ / shares | $ 31.34 |  | $ 31.34 |  |
130% of the conversion price (in dollars per share) | $ / shares |  |  | $ 40.74 |  |
Debt instrument percentage of conversion price |  |  | 130.00% |  |
Debt instrument percentage of sales price of common stock | 98.00% |  | 98.00% |  |
Maximum threshold of quarterly cash dividends per share of common stock for not adjusting conversion rate of convertible notes | $ / shares |  |  | $ 0.085 |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of debt | $ 465,344 |  | $ 465,344 |  |
Interest expense [Abstract] |  |  |  |  |
Contractual coupon interest | 2,618 | 3,266 | 5,236 | 6,641 |
Non-cash amortization of debt discount | 0 | 3,479 | 0 | 7,096 |
Other non-cash interest expense (income) | 433 | 435 | 866 | 889 |
Total interest expense related to the debentures | 3,051 | 7,180 | 6,102 | 14,626 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |
Debt Instruments [Abstract] |  |  |  |  |
Convertible debt | $ 0 |  | $ 0 |  | 130
Convertible Senior Debentures [Member] |  |  |  |  |
Interest expense [Abstract] |  |  |  |  |
Contractual coupon interest |  | 16 |  | 60 |
Non-cash amortization of debt discount |  | 9 |  | 29 |
Other non-cash interest expense (income) |  | 0 |  | 0 |
Total interest expense related to the debentures |  | $ 25 |  | $ 89 |
Convertible Debt [Member] |  |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of debt |  |  |  |  | 465,644
Unamortized discount |  |  |  |  | (59,246)
Carrying value of liability component |  |  |  |  | 406,398
Equity component - net carrying value |  |  |  |  | 66,248
Convertible Debt [Member] | Convertible Senior Notes, Due 2025 [Member] |  |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of debt |  |  |  |  | 465,344
Unamortized discount |  |  |  |  | (59,076)
Carrying value of liability component |  |  |  |  | 406,268
Equity component - net carrying value |  |  |  |  | 66,127
Convertible Debt [Member] | Convertible Senior Debentures, Due 2040 [Member] |  |  |  |  |
Liability and equity components of convertible debentures [Abstract] |  |  |  |  |
Principal amount of debt |  |  |  |  | 300
Unamortized discount |  |  |  |  | (170)
Carrying value of liability component |  |  |  |  | 130
Equity component - net carrying value |  |  |  |  | $ 121

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