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Leases - Operating and Finance Lease Right-of-use-assets and Related Lease Obligations (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Leases    
Operating lease assets $ 5,849  
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Operating lease assets  
Finance lease assets $ 21,880  
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] Finance lease assets  
Total leased assets $ 27,729  
Operating liabilities current $ 3,144  
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Finance liabilities current $ 399  
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] Other Liabilities, Current  
Operating liabilities noncurrent $ 2,553  
Operating Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Other Liabilities, Noncurrent  
Finance liabilities noncurrent $ 48,149 $ 47,757
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] Finance liabilities noncurrent  
Total lease liabilities $ 54,245  
Operating Lease, Liability, Statement of Financial Position [Extensible List] us-gaap:OtherLiabilitiesCurrent us-gaap:OtherLiabilitiesNoncurrent  
Finance lease, accumulated depreciation $ 47,400  
Prepaid financing costs $ 700