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Commitments and Contingencies - Minimum Required Payments (Details)
$ in Thousands
Dec. 31, 2019
USD ($)
Unconditional Purchase  Obligations  
2020 $ 14,005
2021 8,384
2022 7,757
2023 5,715
2024 4,988
Thereafter 39,070
Unconditional Purchase  Obligations $ 79,919