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Leases - Components of Lease Expense (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Leases [Abstract]        
Operating lease cost $ 782 $ 801 $ 3,572 $ 1,594
Finance lease cost:        
Amortization of leased assets 3,389 2,943 10,222 8,859
Interest on lease liabilities 1,019 315 2,935 1,403
Net lease cost $ 5,190 $ 4,059 $ 16,729 $ 11,856