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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2014
Dec. 31, 2013
Assets    
Held for investment $ 64,920 $ 60,840
Equity securities, available for sale 7,767 7,778
Mortgage loans on real estate 2,584,583 2,581,082
Other investments 213,706 215,042
Coinsurance deposits 3,028,367 2,999,618
Liabilities    
Policy benefit reserves 36,731,438 35,789,655
Carrying Amount [Member]
   
Assets    
Mortgage loans on real estate 2,584,583 2,581,082
Derivative instruments 790,396 856,050
Other investments 193,114 192,198
Cash and cash equivalents 679,172 897,529
Coinsurance deposits 3,028,367 2,999,618
Counterparty collateral 275,558 315,824
Liabilities    
Policy benefit reserves 36,395,040 35,453,166
Single premium immediate annuity (SPIA) benefit reserves 402,549 417,625
Notes payable 521,758 549,958
Subordinated debentures 246,097 246,050
Carrying Amount [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 4,926 6,103
Carrying Amount [Member] | Interest Rate Swap [Member]
   
Assets    
Derivative assets 0 712
Liabilities    
Interest rate swap 690 0
Carrying Amount [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 86,640 107,041
Carrying Amount [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 86,640 107,041
Carrying Amount [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 28,315,473 26,610,447
Held for investment 76,298 76,255
Carrying Amount [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale 7,767 7,778
Fair Value [Member]
   
Assets    
Mortgage loans on real estate 2,616,777 2,615,410
Derivative instruments 790,396 856,050
Other investments 195,888 193,343
Cash and cash equivalents 679,172 897,529
Coinsurance deposits 2,707,325 2,669,432
Counterparty collateral 275,558 315,824
Liabilities    
Policy benefit reserves 30,382,940 29,670,827
Single premium immediate annuity (SPIA) benefit reserves 415,757 430,835
Notes payable 611,384 699,435
Subordinated debentures 239,126 234,959
Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 4,926 6,103
Fair Value [Member] | Interest Rate Swap [Member]
   
Assets    
Derivative assets 0 712
Liabilities    
Interest rate swap 690 0
Fair Value [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 86,640 107,041
Fair Value [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 86,640 107,041
Fair Value [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 28,315,473 26,610,447
Held for investment 64,920 60,840
Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale $ 7,767 $ 7,778