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Leases - Cash flow (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Leases    
Operating cash flows from operating leases $ 6,816 $ 3,414
Financing cash flows from finance lease 2,224 15,000
Operating cash flows from finance leases 776  
Right-of-use assets obtained in exchange for operating lease obligations $ 13 18,117
Right-of-use assets obtained in exchange for finance lease obligations   $ 41,212