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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Assets    
Held for investment $ 67,672 $ 65,377
Other investments 290,556 291,530
Coinsurance deposits 3,586,871 3,187,470
Liabilities    
Policy benefit reserves 47,456,425 45,495,431
Carrying Amount [Member]    
Assets    
Mortgage loans on real estate 2,471,435 2,435,257
Derivative instruments 387,469 337,256
Other investments 285,200 285,044
Cash and cash equivalents 707,177 397,749
Coinsurance deposits 3,586,871 3,187,470
Counterparty collateral 85,477 82,312
Liabilities    
Policy benefit reserves 47,113,312 45,151,460
Single premium immediate annuity (SPIA) benefit reserves 313,559 324,264
Notes payable 393,482 393,227
Subordinated debentures 241,550 241,452
Carrying Amount [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 740 1,410
Carrying Amount [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,375 3,139
Carrying Amount [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 38,410,000 36,421,839
Held for investment 76,672 76,622
Carrying Amount [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,813 7,828
Fair Value [Member]    
Assets    
Mortgage loans on real estate 2,504,371 2,471,864
Derivative instruments 387,469 337,256
Other investments 288,303 290,075
Cash and cash equivalents 707,177 397,749
Coinsurance deposits 3,220,784 2,860,882
Counterparty collateral 85,477 82,312
Liabilities    
Policy benefit reserves 39,941,007 38,435,515
Single premium immediate annuity (SPIA) benefit reserves 325,251 336,066
Notes payable 411,252 417,752
Subordinated debentures 212,638 216,933
Fair Value [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 740 1,410
Fair Value [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 5,375 3,139
Fair Value [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 38,410,000 36,421,839
Held for investment 67,672 65,377
Fair Value [Member] | Equity Securities [Member]    
Assets    
Available for sale securities $ 7,813 $ 7,828