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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Assets
Held for investment	$ 76,702	$ 68,766
Other investments	314,421	308,774
Coinsurance deposits	4,710,650	4,639,492
Liabilities
Policy benefit reserves	53,903,497	51,637,026
Carrying Amount [Member]
Assets
Available for sale securities	43,893,785	41,060,494
Held for investment	76,931	76,825
Mortgage loans on real estate	2,553,391	2,480,956
Derivative instruments	1,086,624	830,519
Other investments	314,421	308,774
Cash and cash equivalents	1,574,913	791,266
Coinsurance deposits	4,710,650	4,639,492
Counterparty collateral	144,283	145,693
Liabilities
Policy benefit reserves	53,546,680	51,280,331
Single premium immediate annuity (SPIA) benefit reserves	286,856	297,724
Notes and loan payable	888,660	493,755
Subordinated debentures	242,045	241,853
Amounts due under repurchase agreements	61,673	0
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	468	1,082
Carrying Amount [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	2,001	2,113
Fair Value [Member]
Assets
Available for sale securities	43,893,785	41,060,494
Held for investment	76,702	68,766
Mortgage loans on real estate	2,554,995	2,522,035
Derivative instruments	1,086,624	830,519
Other investments	305,551	300,918
Cash and cash equivalents	1,574,913	791,266
Coinsurance deposits	4,213,996	4,150,792
Counterparty collateral	144,283	145,693
Liabilities
Policy benefit reserves	44,785,605	43,104,183
Single premium immediate annuity (SPIA) benefit reserves	296,948	308,028
Notes and loan payable	929,437	519,440
Subordinated debentures	245,190	225,106
Amounts due under repurchase agreements	61,673	0
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	468	1,082
Fair Value [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	$ 2,001	$ 2,113

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