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Acquisition - Amortization expense (Details) - Nonstop Delivery L L C [Member]
$ in Thousands
Mar. 31, 2021
USD ($)
Finite-Lived Intangible Assets [Line Items]  
Remainder of 2021 $ 2,873
2022 3,480
2023 3,230
2024 3,218
2025 $ 3,080