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Lease Obligations - Summary of other and supplemental cash flow information related to leases (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Other information:    
Operating cash flow from operating leases $ 2,069 $ 1,679
Right-of-use asset obtained in exchange for new operating lease obligations $ 3,024 $ 869