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Contractual Obligations (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]      
2018 $ 808    
2019 479    
2020 47    
2021 47    
2022 4    
Total 1,385    
Rent expense $ 2,200 $ 2,400 $ 2,300