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Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Assets
Held for investment	$ 68,542	$ 65,377
Other investments	292,776	291,530
Coinsurance deposits	4,120,911	3,187,470
Liabilities
Policy benefit reserves	49,432,481	45,495,431
Carrying Amount [Member]
Assets
Mortgage loans on real estate	2,451,375	2,435,257
Derivative instruments	576,262	337,256
Other investments	292,776	285,044
Cash and cash equivalents	1,547,041	397,749
Coinsurance deposits	4,120,911	3,187,470
Counterparty collateral	91,457	82,312
Liabilities
Policy benefit reserves	49,086,249	45,151,460
Single premium immediate annuity (SPIA) benefit reserves	304,365	324,264
Notes payable	393,739	393,227
Subordinated debentures	241,650	241,452
Carrying Amount [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	427	1,410
Carrying Amount [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	5,971	3,139
Carrying Amount [Member] | Fixed Maturity Securities [Member]
Assets
Available for sale securities	39,863,803	36,421,839
Held for investment	76,722	76,622
Carrying Amount [Member] | Equity Securities [Member]
Assets
Available for sale securities	7,813	7,828
Fair Value [Member]
Assets
Mortgage loans on real estate	2,478,023	2,471,864
Derivative instruments	576,262	337,256
Other investments	291,107	290,075
Cash and cash equivalents	1,547,041	397,749
Coinsurance deposits	3,700,449	2,860,882
Counterparty collateral	91,457	82,312
Liabilities
Policy benefit reserves	41,155,256	38,435,515
Single premium immediate annuity (SPIA) benefit reserves	315,420	336,066
Notes payable	424,804	417,752
Subordinated debentures	229,881	216,933
Fair Value [Member] | Interest Rate Caps [Member]
Assets
Interest rate derivative assets	427	1,410
Fair Value [Member] | Interest Rate Swap [Member]
Liabilities
Interest rate derivative liabilities	5,971	3,139
Fair Value [Member] | Fixed Maturity Securities [Member]
Assets
Available for sale securities	39,863,803	36,421,839
Held for investment	68,542	65,377
Fair Value [Member] | Equity Securities [Member]
Assets
Available for sale securities	$ 7,813	$ 7,828

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