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Fair Values of Financial Instruments (Carrying Amounts and Fair Values of Financial Instruments) (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Assets
Available for sale securities, fair value	$ 45,923,727	$ 45,372,989
Held for investment	0	76,460
Derivative instruments	205,149	1,568,380
Other investments	355,531	616,764
Coinsurance deposits	4,954,068	4,858,289
Liabilities
Policy benefit reserves	57,606,009	56,142,673
Carrying Amount
Assets
Available for sale securities, fair value	45,923,727	45,372,989
Held for investment	0	77,041
Mortgage loans on real estate	2,943,091	2,665,531
Derivative instruments	205,149	1,568,380
Other investments	355,531	616,764
Cash and cash equivalents	344,396	1,434,045
Coinsurance deposits	4,954,068	4,858,289
Counterparty collateral	33,101	186,108
Liabilities
Policy benefit reserves	57,249,510	55,786,011
Single premium immediate annuity (SPIA) benefit reserves	270,406	282,563
Notes payable	494,591	494,093
Subordinated debentures	242,982	242,565
Amounts due under repurchase agreements	109,298	0
Carrying Amount | Interest Rate Caps
Assets
Interest rate derivative assets	597	415
Carrying Amount | Interest Rate Swap
Assets
Interest rate derivative assets	354	0
Liabilities
Interest rate derivative liabilities	0	789
Fair Value
Assets
Available for sale securities, fair value	45,923,727	45,372,989
Held for investment	0	76,460
Mortgage loans on real estate	2,920,612	2,670,037
Derivative instruments	205,149	1,568,380
Other investments	348,970	605,894
Cash and cash equivalents	344,396	1,434,045
Coinsurance deposits	4,553,790	4,347,990
Counterparty collateral	33,101	186,108
Liabilities
Policy benefit reserves	49,180,143	46,344,931
Single premium immediate annuity (SPIA) benefit reserves	279,077	292,153
Notes payable	489,985	521,800
Subordinated debentures	215,514	244,117
Amounts due under repurchase agreements	109,298	0
Fair Value | Interest Rate Caps
Assets
Interest rate derivative assets	597	415
Fair Value | Interest Rate Swap
Assets
Interest rate derivative assets	354	0
Liabilities
Interest rate derivative liabilities	$ 0	$ 789

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