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Leases - Future Minimum Payments Under Operating Leases with Noncancelable Terms (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 13,985
2020 12,204
2021 9,448
2022 7,706
2023 6,201
After 2023 $ 28,442