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Commitments and Contingencies - Minimum Lease Commitments (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Minimum lease payments under non-cancelable leases      
Lease expense $ 6,300 $ 5,300 $ 2,500
Property and equipment under operating leases      
Minimum lease payments under non-cancelable leases      
2019 5,143    
2020 5,056    
2021 2,432    
2022 1,812    
2023 1,066    
Thereafter 548    
Total $ 16,057