Fair Values of Financial Instruments (Fair Values and Carrying Amounts of Financial Instruments) (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Assets
Equity securities, available for sale	$ 9,708	$ 53,422
Mortgage loans on real estate	2,593,851	2,623,940
Other investments	212,870	196,366
Coinsurance deposits	2,970,601	2,910,701
Liabilities
Policy benefit reserves	34,652,479	31,773,988
Carrying Amount [Member]
Assets
Held for investment	76,212	76,088
Mortgage loans on real estate	2,593,851	2,623,940
Derivative instruments	625,236	415,258
Other investments	187,437	163,193
Cash and cash equivalents	934,931	1,268,545
Coinsurance deposits	2,970,601	2,910,701
2015 notes hedges	144,904	43,105
Counterparty collateral	240,713	0
Liabilities
Policy benefit reserves	34,319,660	31,452,496
Single premium immediate annuity (SPIA) benefit reserves	430,908	455,167
Notes payable	691,452	309,869
Subordinated debentures	246,003	245,869
2015 notes embedded derivatives	147,150	43,105
2015 warrants	51,077	0
Carrying Amount [Member] \| Interest Rate Caps [Member]
Assets
Derivative assets	5,356	3,247
Carrying Amount [Member] \| Interest Rate Swap [Member]
Liabilities
Interest rate swap	222	4,261
Carrying Amount [Member] \| Fixed Maturity Securities [Member]
Assets
Available for sale securities	26,262,878	24,172,136
Carrying Amount [Member] \| Equity Securities, Available For Sale [Member]
Assets
Equity securities, available for sale	9,708	53,422
Fair Value [Member]
Assets
Held for investment	60,843	61,521
Mortgage loans on real estate	2,711,170	2,848,235
Derivative instruments	625,236	415,258
Other investments	187,655	163,517
Cash and cash equivalents	934,931	1,268,545
Coinsurance deposits	2,642,309	2,678,232
2015 notes hedges	144,904	43,105
Counterparty collateral	240,713	0
Liabilities
Policy benefit reserves	28,802,302	26,264,831
Single premium immediate annuity (SPIA) benefit reserves	444,512	469,768
Notes payable	1,023,962	422,175
Subordinated debentures	233,125	218,283
2015 notes embedded derivatives	147,150	43,105
2015 warrants	51,077	0
Fair Value [Member] \| Interest Rate Caps [Member]
Assets
Derivative assets	5,356	3,247
Fair Value [Member] \| Interest Rate Swap [Member]
Liabilities
Interest rate swap	222	4,261
Fair Value [Member] \| Fixed Maturity Securities [Member]
Assets
Available for sale securities	26,262,878	24,172,136
Fair Value [Member] \| Equity Securities, Available For Sale [Member]
Assets
Equity securities, available for sale	$ 9,708	$ 53,422

Fair Value Liabilities Measured on Recurring Basis, 2015 Notes Embedded Derivative

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Hedge transacation whereby we have the option to receive the cash equivalent of the conversion spread on16.0 million shares of our common stock based upon a strike price of $12.50 per share, subject to certain conversion rate adjustments in the 2015 Notes.

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Amount of equity securities categorized neither as held-to-maturity nor as trading.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

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Amount of subordinated debt obligations (also known as subordinated loan, subordinated bond, subordinated debenture or junior debt) which has a priority ranking after other debts in a dissolution, measured at fair value.

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Funds held by the ceding insurer on behalf the reinsurer, including funds held in trust, under reinsurance treaties or contracts with the assuming insurer as security for the payment of the obligations thereunder, which represent an asset for the reinsurer. There is another concept for the corresponding liability of the ceding insurer.

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The sum of the known and estimated amounts payable as of the balance sheet date to policyholders pertaining to insured events for long-duration contracts, which can be viewed as either (a) the present value of future benefits to be paid to or on behalf of policyholders and expenses less the present value of future net premiums payable under the insurance contracts or (b) the accumulated amount of net premiums already collected less the accumulated amount of benefits and expenses already paid to or on behalf of policyholders.

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Other investments not otherwise specified in the taxonomy.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

-Paragraph 1

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-Article 7

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

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