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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Assets    
Held for investment, fair value $ 60,840 $ 61,521
Equity securities, available for sale 7,778 53,422
Mortgage loans on real estate 2,581,082 2,623,940
Other investments 215,042 196,366
Coinsurance deposits 2,999,618 2,910,701
Liabilities    
Policy benefit reserves 35,789,655 31,773,988
Carrying Amount [Member]
   
Assets    
Mortgage loans on real estate 2,581,082 2,623,940
Derivative assets 856,050 415,258
Other investments 192,198 163,193
Cash and cash equivalents 897,529 1,268,545
Coinsurance deposits 2,999,618 2,910,701
Counterparty collateral 315,824 63,012
Liabilities    
Policy benefit reserves 35,453,166 31,452,496
Single premium immediate annuity (SPIA) benefit reserves 417,625 455,167
Notes payable 549,958 309,869
Subordinated debentures 246,050 245,869
Carrying Amount [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 6,103 3,247
Carrying Amount [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 712 0
Liabilities    
Interest rate derivative liabilities 0 4,261
Carrying Amount [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 107,041 43,105
Carrying Amount [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 107,041 43,105
Carrying Amount [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 26,610,447 24,172,136
Held for investment, fair value 76,255 76,088
Carrying Amount [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale 7,778 53,422
Fair Value [Member]
   
Assets    
Mortgage loans on real estate 2,615,410 2,848,235
Derivative assets 856,050 415,258
Other investments 193,343 163,517
Cash and cash equivalents 897,529 1,268,545
Coinsurance deposits 2,669,432 2,563,356
Counterparty collateral 315,824 63,012
Liabilities    
Policy benefit reserves 29,670,827 26,264,831
Single premium immediate annuity (SPIA) benefit reserves 430,835 469,768
Notes payable 699,435 379,070
Subordinated debentures 234,959 218,283
Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Interest rate derivative assets 6,103 3,247
Fair Value [Member] | Interest Rate Swap [Member]
   
Assets    
Interest rate derivative assets 712 0
Liabilities    
Interest rate derivative liabilities 0 4,261
Fair Value [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 107,041 43,105
Fair Value [Member] | 2015 Notes Embedded Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 107,041 43,105
Fair Value [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 26,610,447 24,172,136
Held for investment, fair value 60,840 61,521
Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale $ 7,778 $ 53,422