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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Assets
Held for investment	$ 76,460	$ 68,766
Other investments	616,764	308,774
Coinsurance deposits	4,858,289	4,639,492
Liabilities
Policy benefit reserves	56,142,673	51,637,026
Interest Rate Caps [Member]
Assets
Derivative assets	415	1,082
Carrying Amount [Member]
Assets
Available for sale securities	45,372,989	41,060,494
Held for investment	77,041	76,825
Mortgage loans on real estate	2,665,531	2,480,956
Derivative assets	1,568,380	830,519
Other investments	616,764	308,774
Cash and cash equivalents	1,434,045	791,266
Coinsurance deposits	4,858,289	4,639,492
Counterparty collateral	186,108	145,693
Liabilities
Policy benefit reserves	55,786,011	51,280,331
Single premium immediate annuity (SPIA) benefit reserves	282,563	297,724
Notes and loan payable	494,093	493,755
Subordinated debentures	242,565	241,853
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	415	1,082
Carrying Amount [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	789	2,113
Fair Value [Member]
Assets
Available for sale securities	45,372,989	41,060,494
Held for investment	76,460	68,766
Mortgage loans on real estate	2,670,037	2,522,035
Derivative assets	1,568,380	830,519
Other investments	605,894	300,918
Cash and cash equivalents	1,434,045	791,266
Coinsurance deposits	4,347,990	4,150,792
Counterparty collateral	186,108	145,693
Liabilities
Policy benefit reserves	46,344,931	43,104,183
Single premium immediate annuity (SPIA) benefit reserves	292,153	308,028
Notes and loan payable	521,800	519,440
Subordinated debentures	244,117	225,106
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	415	1,082
Fair Value [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	$ 789	$ 2,113

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