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Quarterly Financial Information (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2015 | Dec. 31, 2014 | Mar. 31, 2013 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Restructuring Cost and Reserve |  |  |  |  |  |
Net realized investment losses (gains) | $ 8,200,000 | $ 21,600,000 |  | $ 83,807,000 | $ (81,184,000) | $ 11,422,000
Settlement of fine and penalty levied by California DOI |  |  |  |  | $ 27,593,550 |
Employee Severance [Member] |  |  |  |  |  |
Restructuring Cost and Reserve |  |  |  |  |  |
Workforce reduction, office closure and severance expense |  |  | $ 10,000,000 |  |  |

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