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Operating lease liability maturities (Details)
$ in Thousands
Sep. 30, 2020
USD ($)
Lessee Disclosure [Abstract]  
Operating lease liability payments, due 2020 (remaining after September 30, 2020) $ 3,546
Operating lease liability payments, due 2021 12,855
Operating lease liability payments, due 2022 5,920
Operating lease liability payments, due 2023 3,596
Operating lease liability payments, due 2024 2,081
Operating lease liability payments, due thereafter 1,640
Total lease payments 29,638
Imputed interest (2,856)
Total operating lease liability $ 26,782
Weighted-average discount rate 6.90%