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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Assets
Held for investment	$ 70,795	$ 68,766
Other investments	309,429	308,774
Coinsurance deposits	4,630,422	4,639,492
Liabilities
Policy benefit reserves	52,701,412	51,637,026
Carrying Amount [Member]
Assets
Available for sale securities	42,105,366	41,060,494
Held for investment	76,878	76,825
Mortgage loans on real estate	2,506,991	2,480,956
Derivative instruments	1,033,552	830,519
Other investments	309,429	308,774
Cash and cash equivalents	1,172,748	791,266
Coinsurance deposits	4,630,422	4,639,492
Counterparty collateral	143,229	145,693
Liabilities
Policy benefit reserves	52,343,991	51,280,331
Single premium immediate annuity (SPIA) benefit reserves	292,482	297,724
Notes and loan payable	494,071	493,755
Subordinated debentures	241,949	241,853
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	804	1,082
Carrying Amount [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	1,729	2,113
Fair Value [Member]
Assets
Available for sale securities	42,105,366	41,060,494
Held for investment	70,795	68,766
Mortgage loans on real estate	2,510,066	2,522,035
Derivative instruments	1,033,552	830,519
Other investments	303,003	300,918
Cash and cash equivalents	1,172,748	791,266
Coinsurance deposits	4,137,329	4,150,792
Counterparty collateral	143,229	145,693
Liabilities
Policy benefit reserves	43,847,625	43,104,183
Single premium immediate annuity (SPIA) benefit reserves	302,808	308,028
Notes and loan payable	518,500	519,440
Subordinated debentures	230,855	225,106
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	804	1,082
Fair Value [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	$ 1,729	$ 2,113

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