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Leases - Future Minimum Payments Under Operating Leases with Noncancelable Terms (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 10,761
2020 8,938
2021 6,235
2022 4,602
2023 3,083
After 2023 $ 17,170