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Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2012
Dec. 31, 2011
Assets [Abstract]    
Available-for-sale Securities, Equity Securities $ 53,422 $ 62,845
Mortgage loans on real estate 2,623,940 2,823,047
Other Investments 196,366 115,930
Coinsurance deposits 2,910,701 2,818,642
Liabilities    
Policy benefit reserves 31,773,988 28,118,716
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Held-to-maturity Securities, Fair Value Disclosure 76,088 2,644,206
Mortgage loans on real estate 2,623,940 2,823,047
Derivative instruments 415,258 273,314
Other Investments 163,193 79,109
Cash and Cash Equivalents, at Carrying Value 1,268,545 404,952
Coinsurance deposits 2,910,701 2,818,642
Interest Rate Derivative Assets, at Fair Value 3,247 0
2015 Notes Hedges 43,105 45,593
Liabilities    
Policy benefit reserves 31,452,496 27,842,770
Liability for Future Policy Benefits, Other Contracts 455,167 397,248
Notes Payable 309,869 297,608
Subordinated debentures 245,869 268,593
2015 Notes Embedded Derivatives 43,105 45,593
Interest Rate Swaps 4,261 0
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Held-to-maturity Securities, Fair Value Disclosure 61,521 2,644,422
Mortgage loans on real estate   3,030,308
Derivative instruments 415,258 273,314
Other Investments 163,517 76,648
Cash and Cash Equivalents, at Carrying Value 1,268,545 404,952
Coinsurance deposits 2,678,232 2,549,025
Interest Rate Derivative Assets, at Fair Value 3,247 0
2015 Notes Hedges 43,105 45,593
Liabilities    
Policy benefit reserves 26,264,831 23,407,540
Liability for Future Policy Benefits, Other Contracts 469,768 412,998
Notes Payable 422,175 376,370
Subordinated debentures 218,283 233,809
2015 Notes Embedded Derivatives 43,105 45,593
Interest Rate Swaps 4,261 0
Fixed Maturities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 24,172,136 18,464,109
Fixed Maturities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Available-for-sale Securities, Debt Securities 24,172,136 18,464,109
Equity Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Available-for-sale Securities, Equity Securities 53,422 62,845
Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets [Abstract]    
Available-for-sale Securities, Equity Securities $ 53,422 $ 62,845