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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Assets
Held for investment	$ 68,108	$ 76,460
Other investments	508,932	616,764
Coinsurance deposits	4,936,037	4,858,289
Liabilities
Policy benefit reserves	56,859,540	56,142,673
Interest Rate Caps [Member]
Assets
Derivative instruments	1,063	415
Carrying Amount [Member]
Assets
Available for sale securities	44,799,370	45,372,989
Held for investment	77,155	77,041
Mortgage loans on real estate	2,794,382	2,665,531
Derivative instruments	847,243	1,568,380
Other investments	508,932	616,764
Cash and cash equivalents	1,259,722	1,434,045
Coinsurance deposits	4,936,037	4,858,289
Counterparty collateral	123,055	186,108
Liabilities
Policy benefit reserves	56,501,423	55,786,011
Single premium immediate annuity (SPIA) benefit reserves	276,214	282,563
Notes payable	494,339	494,093
Subordinated debentures	242,770	242,565
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	1,063	415
Carrying Amount [Member] | Interest Rate Swap [Member]
Assets
Interest rate derivative assets	850	0
Liabilities
Interest rate derivative liabilities	0	789
Fair Value [Member]
Assets
Available for sale securities	44,799,370	45,372,989
Held for investment	68,108	76,460
Mortgage loans on real estate	2,769,163	2,670,037
Derivative instruments	847,243	1,568,380
Other investments	499,644	605,894
Cash and cash equivalents	1,259,722	1,434,045
Coinsurance deposits	4,478,159	4,347,990
Counterparty collateral	123,055	186,108
Liabilities
Policy benefit reserves	48,016,495	46,344,931
Single premium immediate annuity (SPIA) benefit reserves	285,302	292,153
Notes payable	489,495	521,800
Subordinated debentures	226,192	244,117
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	1,063	415
Fair Value [Member] | Interest Rate Swap [Member]
Assets
Interest rate derivative assets	850	0
Liabilities
Interest rate derivative liabilities	$ 0	$ 789

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