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Lease Commitments - Future Minimum Lease Payments Under Operating Leases (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 25,453
2020 20,590
2021 11,051
2022 8,204
2023 7,894
Thereafter 20,757
Total minimum lease payments $ 93,949