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Lease Obligations - Summary of other and supplemental cash flow information related to leases (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Other information:    
Operating cash flow from operating leases $ 4,335 $ 2,943
Right-of-use asset obtained in exchange for new operating lease obligations $ 5,111 $ 1,234