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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Assets    
Operating lease right-of-use assets $ 29,437 $ 30,544
Finance lease right-of-use assets $ 2,919 3,238
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $356,613 and $351,753, respectively  
Total right-of-use lease assets $ 32,356 33,782
Current    
Operating lease obligations 10,010 9,711
Finance lease obligations 1,105 1,127
Total current obligations 11,115 10,838
Non-current    
Operating lease obligations 19,435 20,845
Finance lease obligations, net of current maturities 2,039 2,313
Total non-current obligations 21,474 23,158
Total lease obligations $ 32,589 $ 33,996