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Leases (Future annual minimum rental commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Leases [Abstract]    
Rental expense $ 3,800 $ 3,400
Future annual minimum rental commitments    
2019 2,848  
2020 2,736  
2021 2,735  
2022 2,202  
2023 1,218  
Thereafter 2,814  
Total $ 14,553