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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

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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