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Leases - Lease right-of-use assets and liabilities (Details)
$ in Thousands
Dec. 31, 2020
USD ($)
item
Dec. 31, 2019
USD ($)
Leases    
Number of finance leases | item 1  
Lease Right-of-Use Assets    
Operating lease right-of-use assets $ 6,918 $ 8,343
Finance lease right-of-use assets $ 202 $ 318
Finance Lease, Right-of-Use Asset, balance sheet location us-gaap:PropertyPlantAndEquipmentNet us-gaap:PropertyPlantAndEquipmentNet
Lease right-of-use assets $ 7,120 $ 8,661
Operating lease liabilities 7,861 8,864
Finance lease liabilities $ 430 $ 640
Finance lease liabilities, balance sheet location us-gaap:LongTermDebt us-gaap:LongTermDebt
Lease liabilities $ 8,291 $ 9,504