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Operating Leases (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Payments [Abstract]      
2018 $ 2,050    
2019 1,673    
2020 1,626    
2021 1,515    
2022 1,392    
Thereafter 3,783    
Total 12,039    
Receipts [Abstract]      
2018 574    
2019 411    
2020 351    
2021 235    
2022 100    
Thereafter 145    
Total 1,816    
Rental expense net of rental income under operating leases $ 1,400 $ 1,300 $ 1,300