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Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) - Parent - Level 3 - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
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Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | $ 32,112 | $ 33,456
Other Financial Instruments |  | 100
Carrying Value |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | 25,815 | 26,660
Other Financial Instruments |  | 97
Estimate of Fair Value Measurement [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitments, Fair Value Disclosure | $ 26,911 | 27,054
Other Financial Instruments |  | $ 97

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