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Commitments and Contingencies (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
guarantee
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Commitments and Contingencies Disclosure [Abstract]      
Rental expense $ 2,200 $ 3,200 $ 3,300
Number of residual value guarantees related to operating leases | guarantee 0    
Operating Leases      
2019 $ 3,413    
2020 2,058    
2021 1,790    
2022 1,640    
2023 1,242    
Thereafter 2,396    
Total $ 12,539