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Commitments and Contingencies - Future Purchase Commitments (Details)
$ in Thousands
Sep. 30, 2017
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2017 $ 38,286
2018 19,702
2019 7,903
2020 5,488
2021 1,333
2022 2
Unconditional purchase obligations $ 72,714