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Leases Leases - Schedule of future lease payments under ASC 840 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Leases [Abstract]  
2019 $ 21,429
2020 20,483
2021 18,897
2022 15,096
2023 12,400
Thereafter 18,371
Total minimum lease payments $ 106,676