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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Assets    
Operating lease right-of-use assets $ 29,098 $ 30,544
Finance lease right-of-use assets $ 2,490 3,238
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $372,147 and $351,753, respectively  
Total right-of-use lease assets $ 31,588 33,782
Current    
Operating lease obligations 9,319 9,711
Finance lease obligations 2,139 1,127
Total current obligations 11,458 10,838
Non-current    
Operating lease obligations 19,776 20,845
Finance lease obligations, net of current maturities 429 2,313
Total non-current obligations 20,205 23,158
Total lease obligations $ 31,663 $ 33,996