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Lease Obligations - Schedule of future minimum lease payments under ASC 840 (Details)
$ in Thousands
Dec. 31, 2018
USD ($)
Future minimum lease payments under previous ASC 840 guidance  
2019 $ 4,829
2020 3,754
2021 2,971
2022 2,379
2023 1,335
Thereafter 2,127
Total minimum lease payments $ 17,395