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Reinsurance and Policy Provisions (Narrative) (Details) (USD $)
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reinsurance and Policy Provisions [Line Items]      
Coinsurance deposits $ 2,999,618,000 $ 2,910,701,000  
Equitrust Coinsurance Agreements, All Periods [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Number of coinsurance agreements 2    
Coinsurance deposits 900,000,000 1,000,000,000  
Reinsurance payable 20,700,000 9,200,000  
Equitrust Coinsurance Agreement, August 1, 2001 to December 31, 2001 [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Coninsurance percentage on certain annuities 70.00%    
Equitrust Coinsurance Agreement, January 1, 2002 to December 31, 2003 [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Coninsurance percentage on certain annuities 40.00%    
Equitrust Coinsurance Agreement, January 1, 2004 to July 31, 2004 [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Coninsurance percentage on certain annuities 20.00%    
Athene Coinsurance Agreements, All Periods [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Number of coinsurance agreements 2    
Coinsurance deposits 2,100,000,000 1,900,000,000  
Reinsurance payable 27,300,000 14,000,000  
Athene Coinsurance Agreement, January 1, 2009 to March 31, 2010 [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Coninsurance percentage on certain annuities 20.00%    
Years until eligibilty for recapture 7    
Athene Coinsurance Agreement, July 1, 2009 to Current [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Coninsurance percentage on certain annuities 80.00%    
Hannover Reinsurance Agreement, All Agreements [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Number of reinsurance agreements 2    
2011 Hannover Reinsurance Agreement [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Duration of statutory surplus benefit reduction 5 years    
Net pretax statutory surplus benefit 49,200,000    
Reduction in pretax statutory surplus 11,300,000 11,800,000 9,200,000
Reduction in pretax statutory surplus due in one year 10,800,000    
Reduction in pretax statutory surplus due in two years 10,300,000    
Reduction in pretax statutory surplus due in three years 2,500,000    
Risk charge rate 1.25%    
Risk charges 1,300,000 1,800,000 1,700,000
2013 Hannover Reinsurance Agreement [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Risk charge rate 1.25%    
Risk charges 7,000,000    
Waived surrender charges on penalty free withdrawals and deaths on certain business, percentage 45.60%    
Reserve credit 288,200,000    
2008 Hannover Reinsurance Agreement [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Net pretax statutory surplus benefit 29,500,000    
Reduction in pretax statutory surplus 6,900,000 6,800,000  
Risk charge rate 1.25%    
Risk charges 100,000 500,000 800,000
2005 Hannover Reinsurance Agreement [Member]
      
Reinsurance and Policy Provisions [Line Items]      
Risk charges 5,400,000 9,900,000 8,600,000
Waived surrender charges on penalty free withdrawals and deaths on certain business, percentage 47.00%    
Reserve credit   $ 180,300,000