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Investments - Schedule of Net Realized Gains (Losses), Including Other-Than-Temporary Impairments (Details) - USD ($)
$ in Thousands
12 Months Ended
Mar. 01, 2016
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Net realized gains (losses) related to sales and other        
Total net realized gains related to sales and other   $ 165,122 $ 17,044 $ 16,365
Net other-than-temporary investment losses recognized in earnings   (2,179) (7,023) (24)
Total net realized gains [1]   162,943 10,021 16,341
Fixed maturity securities        
Net realized gains (losses) related to sales and other        
Total net realized gains related to sales and other   143,602 3,164 16,820
Net other-than-temporary investment losses recognized in earnings   (327) (2,382) (24)
Equity securities        
Net realized gains (losses) related to sales and other        
Total net realized gains related to sales and other   5,680 1,791 (328)
Commercial mortgage loans on real estate        
Net realized gains (losses) related to sales and other        
Total net realized gains related to sales and other   13,647 390 32
Other investments        
Net realized gains (losses) related to sales and other        
Total net realized gains related to sales and other   2,193 11,699 (159)
Net other-than-temporary investment losses recognized in earnings   (1,852) $ (4,641) $ 0
Disposal Group, Disposed of by Sale, Not Discontinued Operations | Assurant Employee Benefits        
Net realized gains (losses) related to sales and other        
Net gains related to sale $ 141,462 $ 141,462    
[1] Related to the sale of Assurant Employee Benefits segment mainly through reinsurance transactions.