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Leases (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Leases      
Total rent expense $ 4,200 $ 4,600 $ 4,500
Aggregate minimum rental commitments under non-cancelable operating leases      
2018 2,097    
2019 1,910    
2020 1,883    
2021 1,266    
2022 433    
Thereafter 5,481    
Total $ 13,070