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Commitments and Contingencies - Future Purchase Commitments (Details)
$ in Thousands
Mar. 31, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 48,252
2019 18,979
2020 8,218
2021 4,033
2022 1,627
Unconditional purchase obligations $ 81,109