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Leases Operating Lease Cost (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Jun. 30, 2019
Leases [Abstract]    
Lease expense $ 315 $ 629
Short-term leases 42 76
Sub-lease income 0 0
Lease cost $ 357 $ 705