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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Assets    
Operating lease right-of-use assets $ 32,438 $ 20,971
Finance lease right-of-use assets $ 4,829 0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $331,174 and $322,128, respectively  
Total right-of-use lease assets $ 37,267 20,971
Current    
Operating lease obligations 9,270 7,765
Finance lease obligations 1,374 0
Total current obligations 10,644 7,765
Non-current    
Operating lease obligations 23,180 13,230
Finance lease obligations, net of current maturities 3,001 0
Total non-current obligations 26,181 13,230
Total lease obligations $ 36,825 $ 20,995