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Leases (Future annual minimum rental commitments) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases [Abstract]      
Rental expense $ 4,300 $ 4,100 $ 5,000
Future annual minimum rental commitments      
2018 3,824    
2019 3,850    
2020 3,099    
2021 2,124    
2022 2,202    
Thereafter 4,033    
Total $ 19,132