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Leases - Maturities of lease liabilities (Details) - USD ($) $ in Thousands | Sep. 26, 2020 | Dec. 31, 2019
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Finance Leases |  |
2020 (excluding the nine months ended September 26, 2020) | $ 1,974 |
2021 | 7,414 |
2022 | 6,974 |
2023 | 6,273 |
2024 | 4,738 |
Thereafter | 14,369 |
Total lease payments | 41,742 |
Less imputed interest | 2,962 |
Present value, Total | 38,780 | $ 30,049
Operating Leases |  |
2020 (excluding the nine months ended September 26, 2020) | 30,826 |
2021 | 106,731 |
2022 | 79,632 |
2023 | 49,986 |
2024 | 29,767 |
Thereafter | 39,114 |
Total lease payments | 336,056 |
Less imputed interest | 23,624 |
Present value, Total | 312,432 | $ 330,100
Total |  |
2020 (excluding the nine months ended September 26, 2020) | 32,800 |
2021 | 114,145 |
2022 | 86,606 |
2023 | 56,259 |
2024 | 34,505 |
Thereafter | 53,483 |
Total lease payments | $ 377,798 |

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