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Fair Value of Financial Instruments (Details) (USD $)
In Thousands, unless otherwise specified

Sep. 30, 2013

Dec. 31, 2012

U.S. government and federally sponsored agency obligations:

Investments, Carrying Amount

$ 6,340,752

$ 6,292,097

Separate Account (variable annuity) assets

1,627,685

1,398,281

Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

5,940,522

5,962,232

5,940,522

5,962,232

Investments, Carrying Amount

6,121,398

6,103,296

Investments, Fair Value

6,121,398

6,103,296

Separate Account (variable annuity) assets

1,627,685

^[1]

1,398,281

^[1]

Separate Account (variable annuity) assets, Fair Value

1,627,685

^[1]

1,398,281

^[1]

Financial Liabilities, Fair Value

0

0

Financial Liabilities, Carrying Value

0

0

Short-term investments [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Carrying Amount

94,245

87,561

Investments, Fair Value

94,245

87,561

Mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

587,361

619,559

587,361

619,559

Other, including U.S. Treasury Securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

455,101

409,428

455,101

409,428

Municipal bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

1,459,611

1,586,037

1,459,611

1,586,037

Foreign government bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

54,321

57,869

54,321

57,869

Corporate bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

2,553,424

2,567,034

2,553,424

2,567,034

Other mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Carrying Amount

830,704

722,305

830,704

722,305

Equity securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Carrying Amount

86,631

53,503

Investments, Fair Value

86,631

53,503

Level 1 [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

28,153

30,528

Investments, Fair Value

177,490

161,793

Separate Account (variable annuity) assets, Fair Value

1,627,685

^[1]

1,398,281

^[1]

Financial Liabilities, Fair Value

0

0

Level 1 [Member] | Short-term investments [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

78,956

87,561

Level 1 [Member] | Mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 1 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

18,063

18,594

Level 1 [Member] | Municipal bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 1 [Member] | Foreign government bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 1 [Member] | Corporate bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

10,090

11,934

Level 1 [Member] | Other mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 1 [Member] | Equity securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

70,381

43,704

Level 2 [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

5,776,753

5,800,535

Investments, Fair Value

5,808,286

5,809,994

Separate Account (variable annuity) assets, Fair Value

0

^[1]

0

^[1]

Financial Liabilities, Fair Value

0

0

Level 2 [Member] | Short-term investments [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

15,289

0

Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

587,361

619,559

Level 2 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

437,038

390,834

Level 2 [Member] | Municipal bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

1,451,296

1,573,762

Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

54,321

57,869

Level 2 [Member] | Corporate bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

2,479,043

2,469,378

Level 2 [Member] | Other mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

767,694

689,133

Level 2 [Member] | Equity securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

16,244

9,459

Level 3 [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

135,616

131,169

Investments, Fair Value

135,622

131,509

Separate Account (variable annuity) assets, Fair Value

0

^[1]

0

^[1]

Financial Liabilities, Fair Value

0

0

Level 3 [Member] | Short-term investments [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

0

0

Level 3 [Member] | Mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 3 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 3 [Member] | Municipal bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

8,315

12,275

Level 3 [Member] | Foreign government bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

0

0

Level 3 [Member] | Corporate bonds [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

64,291

85,722

Level 3 [Member] | Other mortgage-backed securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

63,010

33,172

Level 3 [Member] | Equity securities [Member] | Recurring [Member]

U.S. government and federally sponsored agency obligations:

Investments, Fair Value

$ 6

$ 340

[1]	Separate Account (variable annuity) liabilities are set equal to Separate Account (variable annuity) assets.

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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