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Leases - Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2019
Leases [Abstract]    
Operating lease cost $ 995 $ 3,337
Short-term lease cost 45 771
Variable lease cost 329 925
Sublease income (84) (252)
Total lease cost 1,285 4,781
Operating cash flows 1,500 4,084
Operating leases $ 4,800 $ 7,578