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Leases - Summary of lease costs (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Leases [Abstract]        
Operating lease costs $ 3,814 $ 3,701 $ 7,629 $ 7,639
Finance lease costs:        
Amortization of ROU assets 478 476 956 951
Interest on lease liabilities 124 142 343 284
Total lease cost $ 4,416 $ 4,319 $ 8,928 $ 8,874