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Leases - Maturities of our operating leases (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2019
Dec. 31, 2018
Maturities of operating leases    
2019 $ 956 $ 3,817
2020 3,176 3,081
2021 2,731 2,671
2022 2,269 2,244
2023 1,851 1,941
Later years 6,151 8,870
Minimum lease commitments   22,624
Less imputed interest (2,906)  
Operating lease liabilities 14,228  
Operating lease rent expense   4,900
Undiscounted future minimum obligations related to this lease $ 2,000 $ 7,400