Lease Obligations - Summary of Lease-Related Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Assets
Operating lease right-of-use assets	$ 22,291	$ 22,958
Finance lease right-of-use assets	390	1,478
Total right-of-use lease assets	22,681	24,436
Current
Operating lease obligations	6,612	6,205
Finance lease obligations	$ 318	1,135
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	us-gaap:PropertyPlantAndEquipmentAndFinanceLeaseRightOfUseAssetAfterAccumulatedDepreciationAndAmortization
Total current obligations	$ 6,930	7,340
Non-current
Operating lease obligations	15,730	16,884
Finance lease obligations	0	338
Total non-current obligations	15,730	17,222
Net present value of minimum lease payments	$ 22,660	$ 24,562