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Leases - Operating and Finance Lease Right-of-use-assets and Related Lease Obligations (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Leases    
Operating lease assets $ 4,213 $ 4,542
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating lease assets  
Finance lease assets $ 20,216 20,544
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance lease assets  
Total leased assets $ 24,429 25,086
Operating liabilities current $ 2,387 $ 2,573
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Finance liabilities current $ 809 $ 756
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Operating liabilities noncurrent $ 1,812 $ 1,949
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Finance liabilities noncurrent $ 47,167 $ 47,393
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance liabilities noncurrent  
Total lease liabilities $ 52,175 52,671
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesNoncurrent  
Finance lease, accumulated depreciation $ 48,700 48,400
Prepaid financing costs $ 700 $ 700