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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