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Operating lease liability maturities (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Lessee Disclosure [Abstract]  
Operating lease liability payments, due 2019 (remaining after September 30, 2019) $ 6,871
Operating lease liability payments, due 2020 20,427
Operating lease liability payments, due 2021 11,982
Operating lease liability payments, due 2022 5,712
Operating lease liability payments, due 2023 3,572
Operating lease liability payments, due thereafter 3,721
Total lease payments 52,285
Imputed interest (5,098) [1]
Total operating lease liability $ 47,187
Weighted-average discount rate 6.60%
[1]
(1) 
The weighted-average discount rate used to determine the operating lease liability as of September 30, 2019 was 6.6 percent.