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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 $ 821 $ 2,434
Short-term lease cost 81 215
Lease, Cost $ 902 $ 2,649