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Commitments and Contingencies - Future Purchase Commitments (Details)
$ in Thousands
Jun. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 44,316
2019 16,806
2020 7,043
2021 3,532
2022 1,138
Unconditional purchase obligations $ 72,835