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Leases - Future Minimum Rental Payments for Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 10,544
2020 9,120
2021 7,370
2022 6,006
2023 4,251
Thereafter 13,103
Total future lease commitments $ 50,394