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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Assets
Held for investment	$ 68,766	$ 65,377
Other investments	308,774	299,358
Coinsurance deposits	4,639,492	3,187,470
Liabilities
Policy benefit reserves	51,637,026	45,495,431
Carrying Amount [Member]
Assets
Mortgage loans on real estate	2,480,956	2,435,257
Derivative assets	830,519	337,256
Other investments	308,774	292,872
Cash and cash equivalents	791,266	397,749
Coinsurance deposits	4,639,492	3,187,470
Counterparty collateral	145,693	82,312
Liabilities
Policy benefit reserves	51,280,331	45,151,460
Single premium immediate annuity (SPIA) benefit reserves	297,724	324,264
Notes and loan payable	493,755	393,227
Subordinated debentures	241,853	241,452
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	1,082	1,410
Carrying Amount [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	2,113	3,139
Carrying Amount [Member] | Fixed Maturity Securities [Member]
Assets
Available for sale securities	41,060,494	36,421,839
Held for investment	76,825	76,622
Fair Value [Member]
Assets
Mortgage loans on real estate	2,522,035	2,471,864
Derivative assets	830,519	337,256
Other investments	300,918	297,903
Cash and cash equivalents	791,266	397,749
Coinsurance deposits	4,150,792	2,860,882
Counterparty collateral	145,693	82,312
Liabilities
Policy benefit reserves	43,104,183	38,435,515
Single premium immediate annuity (SPIA) benefit reserves	308,028	336,066
Notes and loan payable	519,440	417,752
Subordinated debentures	225,106	216,933
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	1,082	1,410
Fair Value [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	2,113	3,139
Fair Value [Member] | Fixed Maturity Securities [Member]
Assets
Available for sale securities	41,060,494	36,421,839
Held for investment	$ 68,766	$ 65,377

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