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Fair Value of Financial Instruments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
U.S. government and federally sponsored agency obligations:
Investments, Carrying Amount	$ 6,426,099	$ 6,292,097
Separate Account (variable annuity) assets	1,508,260	1,398,281
Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	6,143,673	5,962,232
Fair Value	6,143,673	5,962,232
Investments, Carrying Amount	6,236,809	6,103,296
Investments, Fair Value	6,236,809	6,103,296
Separate Account (variable annuity) assets	1,508,260	1,398,281
Separate Account (variable annuity) assets, Fair Value	1,508,260	1,398,281
Financial Liabilities
Short-term investments [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Investments, Carrying Amount	34,475	87,561
Investments, Fair Value	34,475	87,561
Mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	631,424	619,559
Fair Value	631,424	619,559
Other, including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	448,519	409,428
Fair Value	448,519	409,428
Municipal bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	1,604,242	1,586,037
Fair Value	1,604,242	1,586,037
Foreign government bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	59,343	57,869
Fair Value	59,343	57,869
Corporate bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	2,649,520	2,567,034
Fair Value	2,649,520	2,567,034
Other mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	750,625	722,305
Fair Value	750,625	722,305
Equity securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Carrying Amount	58,661	53,503
Fair Value	58,661	53,503
Level 1 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	32,022	30,528
Investments, Fair Value	114,257	161,793
Separate Account (variable annuity) assets, Fair Value	1,508,260
Financial Liabilities
Level 1 [Member] | Short-term investments [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Investments, Fair Value	34,475	87,561
Level 1 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	18,443	18,594
Level 1 [Member] | Corporate bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	13,579	11,934
Level 1 [Member] | Equity securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	47,760	43,704
Level 2 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	6,007,895	5,800,535
Investments, Fair Value	6,018,456	5,809,994
Separate Account (variable annuity) assets, Fair Value		1,398,281
Financial Liabilities
Level 2 [Member] | Mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	631,424	619,559
Level 2 [Member] | Other, including U.S. Treasury Securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	430,076	390,834
Level 2 [Member] | Municipal bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	1,589,096	1,573,762
Level 2 [Member] | Foreign government bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	59,343	57,869
Level 2 [Member] | Corporate bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	2,580,414	2,469,378
Level 2 [Member] | Other mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	717,542	689,133
Level 2 [Member] | Equity securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	10,561	9,459
Level 3 [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	103,756	131,169
Investments, Fair Value	104,096	131,509
Financial Liabilities
Level 3 [Member] | Municipal bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	15,146	12,275
Level 3 [Member] | Corporate bonds [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	55,527	85,722
Level 3 [Member] | Other mortgage-backed securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	33,083	33,172
Level 3 [Member] | Equity securities [Member] | Recurring [Member]
U.S. government and federally sponsored agency obligations:
Fair Value	$ 340	$ 340

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