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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Assets    
Operating lease right-of-use assets $ 32,675 $ 20,971
Finance lease right-of-use assets $ 4,965 0
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $336,347 and $322,128, respectively  
Total right-of-use lease assets $ 37,640 20,971
Current    
Operating lease obligations 9,405 7,765
Finance lease obligations 1,318 0
Total current obligations 10,723 7,765
Non-current    
Operating lease obligations 23,272 13,230
Finance lease obligations, net of current maturities 3,026 0
Total non-current obligations 26,298 13,230
Total lease obligations $ 37,021 $ 20,995