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Lease Commitments - Lease Commitments Future Minimum Obligations (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 5,586
2020 4,420
2021 3,050
2022 2,166
2023 1,411
Later years 1,192
Minimum future obligations $ 17,825