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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Assets    
Held for investment $ 62,000 $ 75,838
Other investments 284,994 286,726
Coinsurance deposits 3,062,924 3,044,342
Liabilities    
Policy benefit reserves 43,582,521 39,802,861
Carrying Amount [Member]    
Assets    
Mortgage loans on real estate 2,452,402 2,434,580
Derivative instruments 180,649 731,113
Other investments 275,300 266,488
Cash and cash equivalents 523,614 701,514
Coinsurance deposits 3,062,924 3,044,342
2015 notes hedges 0 30,291
Counterparty collateral 30,880 206,096
Liabilities    
Policy benefit reserves 43,240,623 39,463,987
Single premium immediate annuity (SPIA) benefit reserves 334,921 365,440
Notes payable 400,000 421,679
Subordinated debentures 246,397 246,243
2015 notes embedded conversion derivative 0 30,291
Carrying Amount [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 1,492 2,778
Carrying Amount [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 4,528 2,644
Carrying Amount [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 35,389,842 32,445,202
Held for investment 76,574 76,432
Carrying Amount [Member] | Equity Securities [Member]    
Assets    
Available for sale securities 7,833 7,805
Fair Value [Member]    
Assets    
Mortgage loans on real estate 2,492,283 2,493,901
Derivative instruments 180,649 731,113
Other investments 282,277 273,004
Cash and cash equivalents 523,614 701,514
Coinsurance deposits 2,750,361 2,698,552
2015 notes hedges 0 30,291
Counterparty collateral 30,880 206,096
Liabilities    
Policy benefit reserves 36,871,234 33,078,978
Single premium immediate annuity (SPIA) benefit reserves 346,930 377,654
Notes payable 421,500 503,349
Subordinated debentures 204,817 244,437
2015 notes embedded conversion derivative 0 30,291
Fair Value [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 1,492 2,778
Fair Value [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 4,528 2,644
Fair Value [Member] | Fixed Maturity Securities [Member]    
Assets    
Available for sale securities 35,389,842 32,445,202
Held for investment 62,000 75,838
Fair Value [Member] | Equity Securities [Member]    
Assets    
Available for sale securities $ 7,833 $ 7,805