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, 2017
Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Letters of Credit Outstanding, Amount $ 7,932  
Notes Payable 744 $ 1,139
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable $ 724 $ 1,072