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Commitments and Contingencies - Summary of Future Minimum Contractual Payments With Third-Party Providers (Details) - Third-party providers [Member]
$ in Thousands
Dec. 31, 2017
USD ($)
Future minimum payments contractually due [Abstract]  
2018 $ 5,497
2019 4,867
2020 4,348
2021 3,790
2022 2,047
Thereafter 406
Contractual Obligation $ 20,955