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Commitments and Contingencies - Future Purchase Commitments (Details)
$ in Thousands
Jun. 30, 2019
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2019 $ 48,211
2020 23,791
2021 14,350
2022 7,148
2023 1,591
Unconditional purchase obligations $ 95,091