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Lease Obligations - Summary of lease-related assets and liabilities (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Assets    
Operating lease right-of-use assets $ 22,620 $ 22,958
Finance lease right-of-use assets $ 664 1,478
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization  
Total right-of-use lease assets $ 23,284 24,436
Current    
Operating lease obligations 6,468 6,205
Finance lease obligations 607 1,135
Total current obligations 7,075 7,340
Non-current    
Operating lease obligations 16,230 16,884
Finance lease obligations 0 338
Total non-current obligations 16,230 17,222
Total lease obligations $ 23,305 $ 24,562