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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Sep. 30, 2014		Dec. 31, 2013
U.S. Government and federally sponsored agency obligations:
Carrying Amount	$ 7,073,799		$ 6,313,189
Fair Value	7,073,799		6,313,189
Investments, Carrying Amount	7,306,471		6,539,473
Investments, Fair Value	148,081		144,921
Separate Account (variable annuity) assets	1,786,363	[1]	1,747,995	[1]
Separate Account (variable annuity) assets, Fair Value	1,786,363	[1]	1,747,995	[1]
Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	6,793,469		6,009,573
Fair Value	6,793,469		6,009,573
Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Carrying Amount	162,217		206,758
Investments, Fair Value	162,217		206,758
Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	534,513		569,725
Fair Value	534,513		569,725
Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	503,712		435,574
Fair Value	503,712		435,574
Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	1,617,105		1,471,527
Fair Value	1,617,105		1,471,527
Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	58,779		54,951
Fair Value	58,779		54,951
Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	2,855,768		2,614,409
Fair Value	2,855,768		2,614,409
Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	1,223,592		863,387
Fair Value	1,223,592		863,387
Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Carrying Amount	106,837		91,858
Fair Value	106,837		91,858
Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Carrying Amount	11,276		5,000
Investments, Fair Value	11,276		5,000
Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value	13,082		0
Financial Liabilities Other policyholders funds, embedded derivatives, Carrying Value	13,082		0
Level 1 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	278,995		308,571
Investments, Fair Value	0		0
Separate Account (variable annuity) assets, Fair Value	1,786,363	[1]	1,747,995	[1]
Level 1 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	28,138		27,938
Level 1 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	162,217		206,354
Level 1 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 1 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	17,697		17,757
Level 1 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 1 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 1 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	10,441		10,181
Level 1 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 1 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	88,640		74,279
Level 1 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	0		0
Level 1 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value	0		0
Level 2 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	6,628,757		5,895,083
Investments, Fair Value	0		0
Separate Account (variable annuity) assets, Fair Value	0	[1]	0	[1]
Level 2 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	6,599,290		5,872,106
Level 2 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	0		404
Level 2 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	534,513		569,725
Level 2 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	486,015		417,817
Level 2 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	1,603,962		1,468,833
Level 2 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	58,779		54,951
Level 2 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	2,779,670		2,543,402
Level 2 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	1,136,351		817,378
Level 2 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	18,191		17,573
Level 2 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	11,276		5,000
Level 2 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value	0		0
Level 3 [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	166,047		109,535
Investments, Fair Value	148,081		144,921
Separate Account (variable annuity) assets, Fair Value	0	[1]	0	[1]
Level 3 [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	166,041		109,529
Level 3 [Member] | Short-term investments [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	0		0
Level 3 [Member] | Mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 3 [Member] | Other, including U.S. Treasury Securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 3 [Member] | Municipal bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	13,143		2,694
Level 3 [Member] | Foreign government bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	0		0
Level 3 [Member] | Corporate bonds [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	65,657		60,826
Level 3 [Member] | Other mortgage-backed securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	87,241		46,009
Level 3 [Member] | Equity securities [Member]
U.S. Government and federally sponsored agency obligations:
Fair Value	6		6
Level 3 [Member] | Other Investment [Member]
U.S. Government and federally sponsored agency obligations:
Investments, Fair Value	0		0
Level 3 [Member] | Other Policyholders Funds, embedded derivatives [Member] | Recurring [Member]
U.S. Government and federally sponsored agency obligations:
Financial Liabilities Other policyholders funds, embedded derivatives, Fair Value	$ 13,082		$ 0
[1] Separate Account (variable annuity) liabilities are set equal to Separate Account (variable annuity) assets.

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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.

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Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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