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Commitments and Contingencies - Minimum Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Minimum lease commitments for property and equipment      
Lease expense $ 5,300 $ 2,500 $ 2,300
Property and equipment under operating leases      
Minimum lease commitments for property and equipment      
2018 5,655    
2019 5,533    
2020 5,529    
2021 2,307    
2022 2,308    
Thereafter 2,919    
Total $ 24,251