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Leases - Maturities of our operating leases (Details) - USD ($) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2018 | Mar. 31, 2019 | Jan. 01, 2019
Maturities of operating leases |  |  |
2019 | $ 3,817 | $ 2,760 |
2020 | 3,081 | 2,450 |
2021 | 2,671 | 1,940 |
2022 | 2,244 | 1,526 |
2023 | 1,941 | 1,198 |
Later years | 8,870 | 2,942 |
Minimum lease commitments | 22,624 |  |
Less imputed interest |  | (1,889) |
Operating Lease, Liability |  | $ 10,927 | $ 11,000
Operating lease rent expense | 4,900 |  |
Undiscounted future minimum obligations related to this lease | $ 7,400 |  |

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- Definition Amount of lessee's undiscounted obligation for lease payments for operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918701-209980 + Details
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