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Leases - Future annual minimum lease payments and finance lease commitments - Present value of lease liabilities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
Present value of lease liabilities - Operating Leases  
Total minimum lease payments $ 105,221
Less: imputed interest (21,585)
Present value of lease liabilities 83,636
Present value of lease liabilities - Finance Leases  
Total minimum lease payments 5,071
Less: imputed interest (578)
Present value of lease liabilities $ 4,493