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Leases - Maturities of our operating leases (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Maturities of operating leases |  |  |
2020 | $ 3,245 |  |
2021 | 2,784 |  |
2022 | 2,422 |  |
2023 | 1,909 |  |
2024 | 1,183 |  |
Later years | 5,004 |  |
Less imputed interest | (2,612) |  |
Operating lease liabilities | 13,935 |  |
Operating lease rent expense |  | $ 4,900 | $ 3,800
Undiscounted future minimum obligations related to this lease | $ 2,000 | 7,400 |
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract] |  |  |
2019 |  | 3,817 |
2020 |  | 3,081 |
2021 |  | 2,671 |
2022 |  | 2,244 |
2023 |  | 1,941 |
Later years |  | 8,870 |
Minimum lease commitments |  | $ 22,624 |

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