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Investments (Details) (USD $)	Mar. 31, 2013	Dec. 31, 2012
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	$ 11,464,082,000	$ 11,333,431,000
Available For Sale Securities Gross Unrealized Losses	122,532,000	133,558,000
Available For Sale Securities Fair Value Disclosure	12,441,501,000	12,380,071,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	19,838,949,000	19,559,432,000
Available For Sale Securities Gross Unrealized Gain	2,683,405,000	2,864,436,000
Available For Sale Securities Gross Unrealized Losses	120,695,000	132,254,000
Available For Sale Securities Fair Value Disclosure	22,401,659,000	22,291,614,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(7,931,000)	(8,625,000)
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	214,267,000	217,046,000
Available For Sale Securities Gross Unrealized Gain	8,235,000	6,958,000
Available For Sale Securities Gross Unrealized Losses	1,837,000	1,304,000
Available For Sale Securities Fair Value Disclosure	220,665,000	222,700,000
Percentage Of Total Available For Sale Securities	100.00%	100.00%
Corporate Debt Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	11,464,082,000	11,333,431,000
Available For Sale Securities Gross Unrealized Gain	1,022,512,000	1,085,973,000
Available For Sale Securities Gross Unrealized Losses	45,093,000	39,333,000
Available For Sale Securities Fair Value Disclosure	12,441,501,000	12,380,071,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	55.50%	55.50%
Canadian Provincial Governments [Member] | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	2,681,603,000	2,676,777,000
Available For Sale Securities Gross Unrealized Gain	1,261,728,000	1,372,731,000
Available For Sale Securities Gross Unrealized Losses	1,133,000	174,000
Available For Sale Securities Fair Value Disclosure	3,942,198,000	4,049,334,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	17.60%	18.20%
Residential Mortgage Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,005,232,000	969,267,000
Available For Sale Securities Gross Unrealized Gain	75,579,000	76,520,000
Available For Sale Securities Gross Unrealized Losses	4,041,000	3,723,000
Available For Sale Securities Fair Value Disclosure	1,076,770,000	1,042,064,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(241,000)	(241,000)
Percentage Of Total Available For Sale Securities	4.80%	4.70%
Asset Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	752,280,000	700,455,000
Available For Sale Securities Gross Unrealized Gain	23,333,000	19,898,000
Available For Sale Securities Gross Unrealized Losses	19,069,000	28,798,000
Available For Sale Securities Fair Value Disclosure	756,544,000	691,555,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(2,259,000)	(2,259,000)
Percentage Of Total Available For Sale Securities	3.40%	3.10%
Commercial Mortgage Backed Securities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,596,659,000	1,608,376,000
Available For Sale Securities Gross Unrealized Gain	143,381,000	142,369,000
Available For Sale Securities Gross Unrealized Losses	41,896,000	51,842,000
Available For Sale Securities Fair Value Disclosure	1,698,144,000	1,698,903,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	(5,431,000)	(6,125,000)
Percentage Of Total Available For Sale Securities	7.60%	7.60%
US Government And Government Agencies And Authorities Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	299,395,000	231,256,000
Available For Sale Securities Gross Unrealized Gain	31,938,000	33,958,000
Available For Sale Securities Gross Unrealized Losses	132,000	24,000
Available For Sale Securities Fair Value Disclosure	331,201,000	265,190,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	1.50%	1.20%
US States And Political Subdivisions Member | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	281,215,000	270,086,000
Available For Sale Securities Gross Unrealized Gain	37,628,000	38,058,000
Available For Sale Securities Gross Unrealized Losses	5,746,000	5,646,000
Available For Sale Securities Fair Value Disclosure	313,097,000	302,498,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	1.40%	1.40%
Other Foreign Government, Supranational And Foreign Government-Sponsored Enterprises | Fixed Maturities Member
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	1,758,483,000	1,769,784,000
Available For Sale Securities Gross Unrealized Gain	87,306,000	94,929,000
Available For Sale Securities Gross Unrealized Losses	3,585,000	2,714,000
Available For Sale Securities Fair Value Disclosure	1,842,204,000	1,861,999,000
Accumulated Other Comprehensive Income Loss Other Than Temporary Impairment Not Credit Loss Net Of Tax Availableforsale Debt Securities	0	0
Percentage Of Total Available For Sale Securities	8.20%	0.00%
Nonredeemable Preferred Stock Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	76,179,000	68,469,000
Available For Sale Securities Gross Unrealized Gain	7,940,000	6,542,000
Available For Sale Securities Gross Unrealized Losses	8,000	170,000
Available For Sale Securities Fair Value Disclosure	84,111,000	74,841,000
Percentage Of Total Available For Sale Securities	38.10%	33.60%
Equity Securities Other Member | Equity Securities [Member]
Schedule Of Available For Sale Securities [Line Items]
Available For Sale Securities Amortized Cost	138,088,000	148,577,000
Available For Sale Securities Gross Unrealized Gain	295,000	416,000
Available For Sale Securities Gross Unrealized Losses	1,829,000	1,134,000
Available For Sale Securities Fair Value Disclosure	$ 136,554,000	$ 147,859,000
Percentage Of Total Available For Sale Securities	61.90%	66.40%

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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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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