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v3.21.1

Long-Term Debt (Details) $ / shares in Units, $ in Thousands | 3 Months Ended |
--- | --- | ---
Apr. 03, 2021 USD ($) $ / shares | Apr. 04, 2020 USD ($) | Dec. 31, 2020 USD ($)
Debt Instruments [Abstract] |  |  |
Credit facility | $ 0 |  | $ 0
Deferred financing costs | (12,131) |  | (11,512)
Long-term debt | 453,213 |  | 394,886
Less current portion | 0 |  | 0
Long-term debt, less current portion | 453,213 |  | 394,886
Interest expense [Abstract] |  |  |
Contractual coupon interest |  | $ 3,419 |
Non-cash amortization of debt discount | 0 | 3,637 |
Other non-cash interest expense (income) |  | 454 |
Total interest expense related to the debentures |  | 7,510 |
Purchase price of extinguished debt | 300 | 19,849 |
Loss on extinguishment of debt, including the write-off of portion of unamortized debt issuance costs | 0 | (2,920) |
Convertible Senior Notes, Due 2025 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 465,344 |  | 406,268
Issuance date | Jun. 12, 2018 |  |
Debt maturity date | Jun. 15, 2025 |  |
Cash coupon rate | 2.25% |  |
Nonconvertible debt borrowing rate at issuance | 5.50% |  |
Effective conversion rate | 31.8965 |  |
Effective conversion price (in dollars per share) | $ / shares | $ 31.35 |  |
130% of the conversion price (in dollars per share) | $ / shares | $ 40.76 |  |
Debt instrument percentage of conversion price | 130.00% |  |
Debt instrument percentage of sales price of common stock | 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 |  |
Interest expense [Abstract] |  |  |
Contractual coupon interest | 2,618 | 3,375 |
Non-cash amortization of debt discount | 0 | 3,617 |
Other non-cash interest expense (income) | 433 | 454 |
Total interest expense related to the debentures | 3,051 | 7,446 |
Convertible Senior Debentures, Due 2040 [Member] |  |  |
Debt Instruments [Abstract] |  |  |
Convertible debt | $ 0 |  | 130
Convertible Senior Debentures [Member] |  |  |
Interest expense [Abstract] |  |  |
Contractual coupon interest |  | 44 |
Non-cash amortization of debt discount |  | 20 |
Other non-cash interest expense (income) |  | 0 |
Total interest expense related to the debentures |  | $ 64 |
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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