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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Assets    
Held for investment $ 75,046 $ 68,766
Other investments 328,299 308,774
Coinsurance deposits 4,758,417 4,639,492
Liabilities    
Policy benefit reserves 54,935,694 51,637,026
Carrying Amount [Member]    
Assets    
Available for sale securities 44,601,297 41,060,494
Held for investment 76,986 76,825
Mortgage loans on real estate 2,611,426 2,480,956
Derivative instruments 1,235,125 830,519
Other investments 328,299 308,774
Cash and cash equivalents 1,285,662 791,266
Coinsurance deposits 4,758,417 4,639,492
Counterparty collateral 125,940 145,693
Liabilities    
Policy benefit reserves 54,578,829 51,280,331
Single premium immediate annuity (SPIA) benefit reserves 283,503 297,724
Notes and loan payable 493,972 493,755
Subordinated debentures 242,145 241,853
Amounts due under repurchase agreements 23,542 0
Carrying Amount [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 370 1,082
Carrying Amount [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities 1,687 2,113
Fair Value [Member]    
Assets    
Available for sale securities 44,601,297 41,060,494
Held for investment 75,046 68,766
Mortgage loans on real estate 2,625,709 2,522,035
Derivative instruments 1,235,125 830,519
Other investments 318,802 300,918
Cash and cash equivalents 1,285,662 791,266
Coinsurance deposits 4,262,511 4,150,792
Counterparty collateral 125,940 145,693
Liabilities    
Policy benefit reserves 45,513,913 43,104,183
Single premium immediate annuity (SPIA) benefit reserves 293,282 308,028
Notes and loan payable 533,800 519,440
Subordinated debentures 240,752 225,106
Amounts due under repurchase agreements 23,542 0
Fair Value [Member] | Interest Rate Caps [Member]    
Assets    
Interest rate derivative assets 370 1,082
Fair Value [Member] | Interest Rate Swap [Member]    
Liabilities    
Interest rate derivative liabilities $ 1,687 $ 2,113