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Reserves (Narrative) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 01, 2011
Dec. 31, 2010
Reinsurance [Line Items]            
Liabilities net of reinsurance $ 3,896,719 $ 3,698,606        
Amount of discounts deducted from outstanding reserves $ 343,954 $ 362,207        
Unfavorable development     $ 6,500      
Interest and discount rates range, minimum 3.30% 0.00%        
Interest and discount rates range, maximum 7.30% 0.00%        
Interest and discount rates, period 20 years          
Inflation percentage assumption 3.00% 0.00%        
Percentage of inflation assumption for 2005 to 2007 2.30% 2.30%        
Long Duration Contracts            
Reinsurance [Line Items]            
Discount rate for case reserves and IBNR claims during or before 2010           5.30%
Discount rate for case reserves and IBNR claims during or after 2011, low end of range         4.30%  
Discount rate for case reserves and IBNR claims during or after 2011, high end of range         4.80%  
Minimum            
Reinsurance [Line Items]            
Description of interest and discount rates for traditional life insurance 7.50% 0.00%        
Percentage of future assumption policy benefit 1.00% 0.00%        
Deferred annuity percentage 1.00% 0.00%        
Percentage of discount rate 1.50% 0.00%        
Interest rates credited on annuities 3.50% 0.00%        
Guaranteed credited rate on annuities 3.50% 0.00%        
Maximum            
Reinsurance [Line Items]            
Description of interest and discount rates for traditional life insurance 5.30% 0.00%        
Percentage of future assumption policy benefit 7.00% 0.00%        
Deferred annuity percentage 5.50% 0.00%        
Percentage of discount rate 4.30% 0.00%        
Interest rates credited on annuities 4.00% 0.00%        
Guaranteed credited rate on annuities 4.00% 0.00%        
Traditional life insurance, excluding block of pre-1980 business            
Reinsurance [Line Items]            
Description of interest and discount rates for traditional life insurance 8.80% 0.00%        
Independent Division            
Reinsurance [Line Items]            
Withdrawal charge, period 7 years          
Independent Division | Minimum            
Reinsurance [Line Items]            
Withdrawal charge 0.00%          
Independent Division | Maximum            
Reinsurance [Line Items]            
Withdrawal charge 7.00%          
AMLIC Division            
Reinsurance [Line Items]            
First-year guaranteed benefit percentage increases 0.00% 0.00%        
Surrender charge 35.00%          
Guaranteed interest rate on nearly all of the preneed deferred annuity contracts 3.00%          
AMLIC Division | Minimum            
Reinsurance [Line Items]            
Withdrawal charge 0.00%          
Percentage of discount rate 0.00% 0.00%        
Renewal guaranteed benefit increases 0.00% 0.00%        
Interest rates based on deferred annuities 1.00% 0.00%        
AMLIC Division | Maximum            
Reinsurance [Line Items]            
Withdrawal charge 8.00%          
Percentage of discount rate 7.50% 0.00%        
Renewal guaranteed benefit increases 3.00% 0.00%        
Interest rates based on deferred annuities 6.50% 0.00%        
Limited number of policies            
Reinsurance [Line Items]            
Credited interest rates on universal life funds 4.50% 0.00%        
Guaranteed crediting rates on universal life fund 4.50% 0.00%        
Majority of policies            
Reinsurance [Line Items]            
Guaranteed crediting rates on universal life fund 4.00%          
Majority of policies | Minimum            
Reinsurance [Line Items]            
Credited interest rates on universal life funds 4.00% 0.00%        
Majority of policies | Maximum            
Reinsurance [Line Items]            
Credited interest rates on universal life funds 4.10% 0.00%        
Group Disability            
Reinsurance [Line Items]            
Liabilities net of reinsurance [1] $ 1,192,996 $ 1,193,415 $ 1,271,851 $ 1,309,087    
Gross of reinsurance, including reclassifications of assets held for sale [1]   $ 1,235,029        
Annuities            
Reinsurance [Line Items]            
Surrender charge, period 7 years          
Universal Life Funds            
Reinsurance [Line Items]            
Surrender charge, period 20 years          
[1] The Company’s net retained credit life and disability claims and benefits payable were $33,852, $45,096 and $54,483 at December 31, 2015, 2014 and 2013.