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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 1,260 $ 3,875
Short-term lease cost 81 239
Variable lease cost 146 580
Total lease cost $ 1,487 $ 4,694