Annual report pursuant to Section 13 and 15(d)

Financial Instruments Financial Instruments - Balance Sheet Grouping (Details)

v3.10.0.1
Financial Instruments Financial Instruments - Balance Sheet Grouping (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Letters of Credit Outstanding, Amount $ 10,650  
Notes Payable 374 $ 744
Carrying Value [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Notes Payable $ 363 $ 724