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Capital Notes (Narrative) (Details) - USD ($) | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Jan. 25, 2017 | Sep. 30, 2012
Debt Instrument [Line Items] |  |  |
Duration of written notice to holders | 30 days |  |
2012 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Capital notes issued |  |  | $ 10,000,000
Debt instrument, interest rate, stated percentage | 6.00% |  |
Debt instrument, maturity date | Apr. 01, 2017 |  |
2017 Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt instrument, maturity date | Jan. 24, 2022 |  |
2017 Notes [Member] | Subsequent Event [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Capital notes issued |  | $ 5,000,000 |
Debt instrument, interest rate, stated percentage |  | 4.00% |

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