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Fair Values of Financial Instruments Fair Values of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified
Sep. 30, 2012
Dec. 31, 2011
Assets    
Equity securities, available for sale, at fair value (cost: 2012 - $56,396; 2011 - $58,438) $ 61,604 $ 62,845
Mortgage loans on real estate 2,724,321 2,823,047
Derivative instruments 577,784 273,314
Other investments 196,779 115,930
Coinsurance deposits 2,913,273 2,818,642
Liabilities    
Policy benefit reserves 30,980,046 28,118,716
Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets    
Held-to-maturity Securities, Fair Value Disclosure 76,048 2,644,206
Mortgage loans on real estate 2,724,321 2,823,047
Other investments 162,215 79,109
Cash and Cash Equivalents, at Carrying Value 2,397,434 404,952
Coinsurance deposits 2,913,273 2,818,642
Interest Rate Swaps 3,252 0
Liabilities    
Policy benefit reserves 30,666,825 27,842,770
Liability for Future Policy Benefits, Other Contracts 456,331 397,248
Notes Payable 306,696 297,608
Subordinated debentures 245,825 268,593
Interest Rate Derivative Liabilities, at Fair Value 4,319 0
Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets    
Held-to-maturity Securities, Fair Value Disclosure 63,759 2,644,422
Mortgage loans on real estate 2,969,635 3,030,308
Other investments 164,902 76,648
Cash and Cash Equivalents, at Carrying Value 2,397,434 404,952
Coinsurance deposits 2,661,627 2,549,025
Interest Rate Swaps 3,252 0
Liabilities    
Policy benefit reserves 25,459,927 23,407,540
Liability for Future Policy Benefits, Other Contracts 471,389 412,998
Notes Payable 398,479 376,370
Subordinated debentures 221,626 233,809
Interest Rate Derivative Liabilities, at Fair Value 4,319 0
Fixed Maturities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets    
Available-for-sale Securities, Fair Value Disclosure 22,410,492 18,464,109
Fixed Maturities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets    
Available-for-sale Securities, Fair Value Disclosure 22,410,492 18,464,109
Equity Securities [Member] | Carrying (Reported) Amount, Fair Value Disclosure [Member]
   
Assets    
Equity securities, available for sale, at fair value (cost: 2012 - $56,396; 2011 - $58,438) 61,604 62,845
Equity Securities [Member] | Estimate of Fair Value, Fair Value Disclosure [Member]
   
Assets    
Equity securities, available for sale, at fair value (cost: 2012 - $56,396; 2011 - $58,438) 61,604 62,845
Call Option [Member]
   
Assets    
Derivative instruments 577,784 273,314
Option on Securities [Member]
   
Assets    
Derivative instruments 40,020 45,593
2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
Embedded Derivative, Fair Value of Embedded Derivative Liability $ 40,020 $ 45,593