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Leases - Reconciliation of Undiscounted Cash Flows (Details) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Lessee, Lease, Description [Line Items]    
Total undiscounted lease obligations $ 50,662 $ 60,995
Less future interest charges (17,097) (19,787)
Total discounted lease obligations 33,565 41,208
Less: current portion of lease obligations (12,829) (14,198)
Non-current portion of lease obligations 20,736 27,010
Within one year [member]    
Lessee, Lease, Description [Line Items]    
Total undiscounted lease obligations 13,505 16,221
Between one and five years [member]    
Lessee, Lease, Description [Line Items]    
Total undiscounted lease obligations 17,902 23,099
Beyond five years [member]    
Lessee, Lease, Description [Line Items]    
Total undiscounted lease obligations $ 19,255 $ 21,675