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Commitments and Contingencies - Future Minimum Rental Payments Required Under Operating Leases (Details)
$ in Thousands
Mar. 31, 2019
USD ($)
Operating Leases, Future Minimum Payments Due, Fiscal Year Maturity [Abstract]  
2015 $ 4,143
2016 3,945
2017 3,166
2018 1,916
2019 1,770
Thereafter 4,497
Total minimum lease payments $ 19,437