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Leases - Lease, costs (Details) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Lease, Cost [Abstract]        
Finance right-of-use assets obtained in exchange for lease obligations $ 0 $ 0 $ 0 $ 0
Operating right-of-use assets obtained in exchange for lease obligations $ 2,100 $ 183 $ 8,641 $ 205