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Leases - Operating and Finance Lease Right-of-use-assets and Related Lease Obligations (Details) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Leases |  |
Operating lease assets | $ 5,033 | $ 5,849
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Operating lease assets |
Finance lease assets | $ 21,200 | 21,880
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Finance lease assets |
Total leased assets | $ 26,233 | 27,729
Operating liabilities current | $ 2,989 | 3,144
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |
Finance liabilities current | $ 654 | 399
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other Liabilities, Current |
Operating liabilities noncurrent | $ 2,035 | 2,553
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other Liabilities, Noncurrent |
Finance liabilities noncurrent | $ 47,787 | 48,149
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Finance liabilities noncurrent |
Total lease liabilities | $ 53,465 | 54,245
Finance lease, accumulated depreciation | 47,900 | 47,400
Prepaid financing costs | $ 700 | $ 700

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