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Reserves - Narrative (Details) - USD ($)
$ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2007
Dec. 31, 2014
Universal Life and Annuity        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 4.50%      
Universal Life and Annuity | Minimum        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 3.50%      
Universal Life and Annuity | Maximum        
Claims and Benefits Payable        
Interest rates credited on annuities at guarantee rates 4.00%      
Universal Life        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 0.00%      
Universal Life | Minimum        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 4.00%      
Universal Life | Maximum        
Claims and Benefits Payable        
Crediting interest rates at guaranteed rates 4.10%      
Surrender charge grading period 20 years      
Global Preneed | Preneed life insurance        
Claims and Benefits Payable        
Future policy benefit increases tied to inflation (as a percent) 3.00% 3.00% 2.30%  
Global Preneed | Preneed life insurance | Minimum        
Claims and Benefits Payable        
Interest rate assumption 4.70% 4.70%    
Percentage of adverse deviation in interest and discount rate for preneed life insurance 0.20% 0.20%    
Future policy benefit increases 1.00% 1.00%    
Global Preneed | Preneed life insurance | Maximum        
Claims and Benefits Payable        
Interest rate assumption 7.30% 7.30%    
Percentage of adverse deviation in interest and discount rate for preneed life insurance 0.50% 0.50%    
Future policy benefit increases 7.00% 7.00%    
Global Preneed | Life insurance no longer offered        
Claims and Benefits Payable        
Period of grading of interest and discount rates   20 years    
Global Preneed | Life insurance no longer offered | Minimum        
Claims and Benefits Payable        
Discount rate 5.30% 5.30%    
Period of grading of interest and discount rates 20 years      
Global Preneed | Life insurance no longer offered | Maximum        
Claims and Benefits Payable        
Discount rate 7.50% 7.50%    
Global Preneed | Block of pre-1980 traditional life insurance business        
Claims and Benefits Payable        
Discount rate 8.80% 8.80%    
Global Preneed | Preneed annuities        
Claims and Benefits Payable        
Withdrawal charge percentage 0.00%      
Global Preneed | Preneed annuities | Minimum        
Claims and Benefits Payable        
Surrender charge grading period   0 years    
Interest rate assumption 1.00% 1.00%    
Withdrawal charge percentage 0.00% 0.00%    
Global Preneed | Preneed annuities | Maximum        
Claims and Benefits Payable        
Surrender charge grading period 7 years 7 years    
Interest rate assumption 5.50% 5.50%    
Withdrawal charge percentage 7.00% 7.00%    
Assurant Health and AEB        
Claims and Benefits Payable        
Favorable development $ 39,946 $ 35,046   $ 50,075