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Summary of Investments (Narratives) (Details) - USD ($) $ in Thousands | Mar. 31, 2016 | Dec. 31, 2015
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Investments [Abstract] |  |
Trading securities | $ 17,446 | $ 16,975
Remaining potential contractual obligation | 10,307 |
Maximum [Member] | Equity Securities [Member] |  |
Schedule of Investments [Line Items] |  |
Largest unrealized loss greater than 12 months on an individual security | $ 189 |

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