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Operating Leases - Future Minimum Lease Payments (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Contractual Obligation, Fiscal Year Maturity Schedule [Abstract]  
2019 $ 9,182
2020 9,910
2021 9,127
2022 8,305
2023 7,229
Thereafter 34,157
Total $ 77,910