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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
U.S. government and federally sponsored agency obligations
Investments, Carrying Value	$ 6,292,097	$ 5,677,508
Separate Account (variable annuity) assets	1,398,281	1,273,764
Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	5,962,232	5,421,832
Fair Value	5,962,232	5,421,832
Investments, Carrying Value	6,103,296	5,549,048
Investments, Fair Value	6,103,296	5,549,048
Separate Account (variable annuity) assets	1,398,281	1,273,764
Separate Account (variable annuity) assets, Fair Value	1,398,281	1,273,764
Financial Liabilities
Short-term investments [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Investments, Carrying Value	87,561	100,442
Investments, Fair Value	87,561	100,442
Mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	619,559	603,812
Fair Value	619,559	603,812
Other including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	409,428	603,741
Fair Value	409,428	603,741
Municipal Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	1,586,037	1,413,118
Fair Value	1,586,037	1,413,118
Foreign government bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	57,869	49,624
Fair Value	57,869	49,624
Corporate Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	2,567,034	2,156,544
Fair Value	2,567,034	2,156,544
Other Mortgage-backed Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	722,305	594,993
Fair Value	722,305	594,993
Equity Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Carrying Amount	53,503	26,774
Fair Value	53,503	26,774
Level 1 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	30,528	89,930
Investments, Fair Value	161,793	196,895
Financial Liabilities
Level 1 [Member] | Short-term investments [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Investments, Fair Value	87,561	97,929
Level 1 [Member] | Other including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	18,594	64,444
Level 1 [Member] | Corporate Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	11,934	25,486
Level 1 [Member] | Equity Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	43,704	9,036
Level 2 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	5,800,535	5,239,114
Investments, Fair Value	5,809,994	5,258,980
Separate Account (variable annuity) assets, Fair Value	1,398,281	1,273,764
Financial Liabilities
Level 2 [Member] | Short-term investments [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Investments, Fair Value		2,513
Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	619,559	603,812
Level 2 [Member] | Other including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	390,834	539,297
Level 2 [Member] | Municipal Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	1,573,762	1,413,118
Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	57,869	49,624
Level 2 [Member] | Corporate Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	2,469,378	2,042,802
Level 2 [Member] | Other Mortgage-backed Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	689,133	590,461
Level 2 [Member] | Equity Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	9,459	17,353
Level 3 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	131,169	92,788
Investments, Fair Value	131,509	93,173
Financial Liabilities
Level 3 [Member] | Municipal Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	12,275
Level 3 [Member] | Corporate Bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	85,722	88,256
Level 3 [Member] | Other Mortgage-backed Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	33,172	4,532
Level 3 [Member] | Equity Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations
Fair Value	$ 340	$ 385

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