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Lease Obligations - Summary of Lease-Related Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Assets    
Operating lease right-of-use assets $ 20,971 $ 22,291
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] Property and equipment, net of accumulated depreciation of $322,128 and $294,366, respectively  
Finance lease right-of-use assets $ 0 390
Total right-of-use lease assets 20,971 22,681
Current    
Operating lease obligations 7,765 6,612
Finance lease obligations 0 318
Total current obligations 7,765 6,930
Non-current    
Operating lease obligations 13,230 15,730
Total non-current obligations 13,230 15,730
Net present value of minimum lease payments $ 20,995 $ 22,660