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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Assets    
Operating lease right-of-use assets $ 21,724 $ 22,291
Finance lease right-of-use assets $ 140 390
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Property and equipment, net of accumulated depreciation of $302,134 and $294,366, respectively  
Total right-of-use lease assets $ 21,864 22,681
Current    
Operating lease obligations 6,986 6,612
Finance lease obligations 53 318
Total current obligations 7,039 6,930
Non-current    
Operating lease obligations 14,787 15,730
Total non-current obligations 14,787 15,730
Total lease obligations $ 21,826 $ 22,660