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Investments (Net Realized Gains (Losses), Including Other-Than-Temporary Impairments) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Mar. 01, 2016
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Gain (Loss) on Investments [Line Items]          
Net realized gains (losses) related to sales and other:   $ 10,704 $ 6,910 $ 194,749 [1] $ 25,434
Net realized losses related to other-than-temporary impairments:   0 (707) (701) (3,277)
Total net realized gains   10,704 6,203 194,048 22,157
Fixed maturity securities          
Gain (Loss) on Investments [Line Items]          
Net realized gains (losses) related to sales and other:   8,737 5,638 154,511 17,897
Net realized losses related to other-than-temporary impairments:   0 (707) (701) (3,277)
Equity securities          
Gain (Loss) on Investments [Line Items]          
Net realized gains (losses) related to sales and other:   (203) 1,449 12,940 3,403
Commercial Mortgage Loans On Real Estate          
Gain (Loss) on Investments [Line Items]          
Net realized gains (losses) related to sales and other:   62 0 21,607 0
Other investments          
Gain (Loss) on Investments [Line Items]          
Net realized gains (losses) related to sales and other:   $ 2,108 $ (177) 5,691 $ 4,134
Disposal Group, Not Discontinued Operations | Employee Benefits Segment          
Gain (Loss) on Investments [Line Items]          
Investments transferred [2] $ 146,727     $ 146,727  
[1] Nine months ended September 30, 2016 net gains includes $146,727 related to the sale of Assurant Employee Benefits as described in Note 5.
[2] Reinsurance of existing claims liabilities requires retroactive accounting necessitating losses to be recognized immediately. However, upon transfer of the associated assets supporting the liabilities, the Company recognized realized gains which more than offset the retroactive losses. The Company was required to classify the realized gains as part of net realized gains on investments, within the Consolidated Statements of Operations.