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Leases - Lease Costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Finance lease cost, Amortization expense $ 110 $ 277 $ 237 $ 425
Finance lease cost, Interest for finance lease 14 16 28 35
Operating lease cost $ 881 $ 728 $ 1,759 $ 1,456