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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, Expense $ 1,128 $ 3,197
Short-term Lease Payments 43 292
Operating Leases, Rent Expense, Net $ 1,171 $ 3,489