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Commitments and Contingencies - Future Minimum Payments for Contractual Commitments (Details)
$ in Thousands
Dec. 31, 2017
USD ($)
Contractual Commitments  
2018 $ 13,227
2019 11,060
2020 7,413
2021 7,355
2022 7,355
Thereafter 5,517
Total commitments $ 51,927