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Lease Obligations - Summary of other and supplemental cash flow information related to leases (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Cash paid for amounts included in the measurement of lease liabilities    
Operating cash flows from operating leases $ 7,635 $ 6,676
Right-of-use asset obtained in exchange for new operating lease obligations $ 5,687 $ 5,592