Annual report pursuant to Section 13 and 15(d)

Financial Instruments Financial Instruments - Balance Sheet Grouping (Details)

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Financial Instruments Financial Instruments - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Letters of Credit Outstanding, Amount $ 13,970  
Notes Payable 6,318 $ 374
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable $ 6,330 $ 363