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Leases - Future annual minimum lease payments and finance lease commitments - Present value of lease liabilities (Details)
$ in Thousands
Sep. 30, 2019
USD ($)
Present value of lease liabilities - Operating Leases  
Total minimum lease payments $ 104,942
Less: imputed interest (23,381)
Present value of lease liabilities 81,561
Finance Lease Liabilities, Gross Difference, Amount [Abstract]  
Total minimum lease payments 6,354
Less: imputed interest (1,070)
Present value of lease liabilities $ 5,284