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Leases - Maturities of our operating leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Jun. 30, 2019
Jan. 01, 2019
Maturities of operating leases      
2019 $ 3,817 $ 1,603  
2020 3,081 2,510  
2021 2,671 1,996  
2022 2,244 1,575  
2023 1,941 1,243  
Later years 8,870 2,955  
Minimum lease commitments 22,624    
Less imputed interest   (1,784)  
Operating lease liabilities   $ 10,098 $ 11,000
Operating lease rent expense 4,900    
Undiscounted future minimum obligations related to this lease $ 7,400