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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) (USD $)
In Thousands, unless otherwise specified
Jun. 30, 2014
Dec. 31, 2013
Assets    
Held for investment $ 66,571 $ 60,840
Equity securities, available for sale 7,762 7,778
Mortgage loans on real estate 2,543,810 2,581,082
Other investments 221,459 215,042
Coinsurance deposits 3,085,340 2,999,618
Liabilities    
Policy benefit reserves 37,876,044 35,789,655
Carrying Amount [Member]
   
Assets    
Mortgage loans on real estate 2,543,810 2,581,082
Derivative instruments 905,688 856,050
Other investments 196,853 192,198
Cash and cash equivalents 1,464,533 897,529
Coinsurance deposits 3,085,340 2,999,618
Counterparty collateral 261,266 315,824
Liabilities    
Policy benefit reserves 37,538,232 35,453,166
Single premium immediate annuity (SPIA) benefit reserves 391,651 417,625
Notes payable 474,361 549,958
Subordinated debentures 246,145 246,050
Carrying Amount [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 3,788 6,103
Carrying Amount [Member] | Interest Rate Swap [Member]
   
Assets    
Derivative assets 0 712
Liabilities    
Interest rate swap 1,983 0
Carrying Amount [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 45,884 107,041
Carrying Amount [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 45,884 107,041
Carrying Amount [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 29,317,572 26,610,447
Held for investment 76,342 76,255
Carrying Amount [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale 7,762 7,778
Fair Value [Member]
   
Assets    
Mortgage loans on real estate 2,596,588 2,615,410
Derivative instruments 905,688 856,050
Other investments 198,293 193,343
Cash and cash equivalents 1,464,533 897,529
Coinsurance deposits 2,722,024 2,669,432
Counterparty collateral 261,266 315,824
Liabilities    
Policy benefit reserves 31,279,983 29,670,827
Single premium immediate annuity (SPIA) benefit reserves 404,561 430,835
Notes payable 564,118 699,435
Subordinated debentures 240,767 234,959
Fair Value [Member] | Interest Rate Caps [Member]
   
Assets    
Derivative assets 3,788 6,103
Fair Value [Member] | Interest Rate Swap [Member]
   
Assets    
Derivative assets 0 712
Liabilities    
Interest rate swap 1,983 0
Fair Value [Member] | 2015 Notes Hedges [Member]
   
Assets    
2015 notes hedges 45,884 107,041
Fair Value [Member] | 2015 Notes Embedded Conversion Derivative [Member]
   
Liabilities    
2015 notes embedded conversion derivative 45,884 107,041
Fair Value [Member] | Fixed Maturity Securities [Member]
   
Assets    
Available for sale securities 29,317,572 26,610,447
Held for investment 66,571 60,840
Fair Value [Member] | Equity Securities, Available For Sale [Member]
   
Assets    
Equity securities, available for sale $ 7,762 $ 7,778