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Debt - Schedule of Maturities of Company's Debt (Details) - USD ($)
Sep. 29, 2019
Dec. 31, 2018
Debt Instrument [Line Items]    
2019 $ 0  
2020 0  
2021 25,000,000  
2022 31,700,000  
2023 25,000,000  
2024 0  
Thereafter 25,000,000  
Total 106,700,000  
Loan Notes | Loan Notes due 2021    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 25,000,000  
2022 0  
2023 0  
2024 0  
Thereafter 0  
Total 25,000,000 $ 25,000,000
Loan Notes | Loan Notes due 2023    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 0  
2022 0  
2023 25,000,000  
2024 0  
Thereafter 0  
Total 25,000,000 25,000,000
Loan Notes | Loan Notes due 2026    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 0  
2022 0  
2023 0  
2024 0  
Thereafter 25,000,000  
Total 25,000,000 25,000,000
Revolving credit facility    
Debt Instrument [Line Items]    
2019 0  
2020 0  
2021 0  
2022 31,700,000  
2023 0  
2024 0  
Thereafter 0  
Total $ 31,700,000 $ 0