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Commitments and Contingencies - Future Purchase Commitments (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 42,451
2019 13,869
2020 6,031
2021 2,919
2022 571
Unconditional purchase obligations $ 65,841