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Commitments and Contingencies - Rental Obligations (Details)
$ in Thousands
Sep. 30, 2018
USD ($)
Commitments and Contingencies Disclosure [Abstract]  
Remainder of 2018 $ 1,536
2019 3,551
2020 1,780
2021 1,651
2022 1,570
Thereafter 2,966
Total operating lease payments $ 13,054