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Financial Instruments Financial Instruments - Balance Sheet Grouping (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Letters of Credit Outstanding, Amount | $ 7,514 |
Notes Payable | 1,139 | $ 1,434
Carrying Value [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Notes Payable | $ 1,072 | $ 1,405

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