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Leases - Cash flow (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Leases [Abstract]    
Operating cash flows from operating leases $ 3,414 $ 1,508
Financing cash flows from finance lease 15,000 0
Right-of-use assets obtained in exchange for operating lease obligations 18,117 11,643
Right-of-use assets obtained in exchange for finance lease obligations $ 41,212 $ 0