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Reserves (Details 3) - USD ($)
$ in Thousands
12 Months Ended 36 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2007
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Minimum              
Short Duration Contracts              
Short duration contracts, discount rate (as a percent) 4.25% 4.25%   4.25% 4.25% 4.25%  
Group disability              
Short Duration Contracts              
Short duration contracts, discount rate (as a percent)             5.25%
Short duration contracts, discount $ 327,475 $ 344,012          
Group disability | Maximum              
Short Duration Contracts              
Short duration contracts, discount rate (as a percent) 4.75% 4.75%   4.75% 4.75% 4.75%  
Preneed life insurance              
Long Duration Contracts              
Future policy benefit increases tied to inflation (as a percent) 3.00% 3.00% 2.30%        
Preneed life insurance | Minimum              
Long Duration Contracts              
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, high end of range (as a percent) 1.00% 1.00%          
Preneed life insurance | Maximum              
Long Duration Contracts              
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, high end of range (as a percent) 7.00% 7.00%          
Preneed annuities              
Long Duration Contracts              
Interest rate assumption 0.00% 0.00%          
Period of grading of interest and discount rates 7 years 7 years          
Preneed annuities | Minimum              
Long Duration Contracts              
Interest rate assumption 1.00% 1.00%          
Withdrawal charges assumption, high end of range 0.00% 0.00%          
Preneed annuities | Maximum              
Long Duration Contracts              
Interest rate assumption 5.50% 5.50%          
Withdrawal charges assumption, high end of range 7.00% 7.00%          
Life insurance no longer offered              
Long Duration Contracts              
Period of grading of interest and discount rates 20 years 20 years          
Life insurance no longer offered | Minimum              
Long Duration Contracts              
Discount rate 5.30% 5.30%          
Life insurance no longer offered | Maximum              
Long Duration Contracts              
Discount rate 7.50% 7.50%          
Block of pre-1980 traditional life insurance business              
Long Duration Contracts              
Discount rate 8.80% 8.80%