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Commitments and Contingencies - Future Interest and Principal Payments (Details)
$ in Thousands
Dec. 28, 2019
USD ($)
Convertible Senior Notes 2024  
Debt Instrument [Line Items]  
2020 $ 8,553
2021 8,553
2022 8,553
2023 8,553
2024 411,053
Thereafter 0
Total 445,265
Line of Credit  
Debt Instrument [Line Items]  
2020 525
2021 0
2022 0
2023 0
2024 30,000
Thereafter 0
Total 30,525
Mortgages  
Debt Instrument [Line Items]  
2020 841
2021 842
2022 841
2023 841
2024 6,725
Thereafter 0
Total 10,090
Financing Assistance Arrangement  
Debt Instrument [Line Items]  
Short-term debt $ 31,809