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v3.19.2

Debt (Tables) | 6 Months Ended
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Jun. 29, 2019
Summary of information about the equity and liability components of convertible debt | The carrying amount of the Notes consisted of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | June 29, |  | December 29,
​ | ​ | 2019 | ​ | 2018
Liability component | ​ |  | ​ | ​ | ​ | ​
Principal | ​ | $ | 400,000 | ​ | $ | 400,000
Unamortized debt discount | ​ |  | (33,512) | ​ | ​ | (39,298)
Unamortized debt issuance costs | ​ |  | (5,058) | ​ | ​ | (5,931)
Net carrying amount | ​ | $ | 361,430 | ​ | $ | 354,771
​ | ​ | ​ | ​ | ​ | ​ | ​
Equity component | ​ |  | ​ | ​ | ​ | ​
Net carrying amount | ​ | $ | 57,735 | ​ | $ | 57,735
Schedule of components of interest expense | Interest expense related to the Notes was comprised of the following (in thousands): ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | Three Months Ended | ​ | Six Months Ended
​ | ​ | June 29, | ​ | June 30, | ​ | June 29, |  | June 30,
​ |  | 2019 |  | 2018 |  | 2019 |  | 2018
Contractual interest expense | ​ | $ | 1,360 | ​ | $ | 1,375 | ​ | $ | 2,750 | ​ | $ | 2,765
Amortization of debt discount | ​ | ​ | 2,900 | ​ | ​ | 2,767 | ​ | ​ | 5,786 | ​ |  | 5,520
Amortization of debt issuance costs | ​ | ​ | 437 | ​ | ​ | 418 | ​ | ​ | 873 | ​ |  | 834
​ | ​ | $ | 4,697 | ​ | $ | 4,560 | ​ | $ | 9,409 | ​ | $ | 9,119

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- Definition Tabular disclosure of borrowings which can be exchanged for a specified number of another security at the option of the issuer or the holder. Disclosures include, but are not limited to, principal amount, amortized premium or discount, and amount of liability and equity components. + 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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