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Commitments and Contingencies - Purchase Commitments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
2019 $ 232,880
2020 48,436
2021 40,112
2022 20,042
2023 2,196
Thereafter 1,876
Contractual Obligation $ 345,542