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Leases - Operating and Finance Lease Right-of-use-assets and Related Lease Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Leases    
Operating lease assets $ 9,242 $ 4,542
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating lease assets Operating lease assets
Finance lease assets $ 19,238 $ 20,544
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance lease assets Finance lease assets
Total leased assets $ 28,480 $ 25,086
Operating liabilities current $ 4,716 $ 2,573
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current Other Liabilities, Current
Finance liabilities current $ 979 $ 756
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Finance liabilities current Finance liabilities current
Operating liabilities noncurrent $ 4,357 $ 1,949
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent Other Liabilities, Noncurrent
Finance liabilities noncurrent $ 46,415 $ 47,393
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance liabilities noncurrent Finance liabilities noncurrent
Total lease liabilities $ 56,467 $ 52,671
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities, Current, Other Liabilities, Noncurrent Other Liabilities, Current, Other Liabilities, Noncurrent
Finance lease, accumulated depreciation $ 48,600 $ 48,400
Prepaid financing costs $ 700 $ 700