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Investments (Details) (USD $)	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Gross Unrealized Losses	$ 133,558,000	$ 292,486,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	6,434,000	(1,236,000)	4,081,000
Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	19,559,432,000	14,182,880,000
Available-for-sale Securities, Gross Unrealized Gains	2,864,436,000	2,300,036,000
Available-for-sale Securities, Gross Unrealized Losses	132,254,000	281,966,000
Available-for-sale Securities, Fair Value Disclosure	22,291,614,000	16,200,950,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(8,625,000)	(18,523,000)
Percentage Of Total Available For Sales Securities	100.00%	100.00%
Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	217,046,000	117,840,000
Available-for-sale Securities, Gross Unrealized Gains	6,958,000	6,580,000
Available-for-sale Securities, Gross Unrealized Losses	1,304,000	10,520,000
Available-for-sale Securities, Fair Value Disclosure	222,700,000	113,900,000
Percentage Of Total Available For Sales 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 Basis	11,333,431,000	6,931,958,000
Available-for-sale Securities, Gross Unrealized Gains	1,085,973,000	654,519,000
Available-for-sale Securities, Gross Unrealized Losses	39,333,000	125,371,000
Available-for-sale Securities, Fair Value Disclosure	12,380,071,000	7,461,106,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Percentage Of Total Available For Sales Securities	55.50%	46.00%
Canadian Provincial Governments [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	2,676,777,000	2,507,802,000
Available-for-sale Securities, Gross Unrealized Gains	1,372,731,000	1,362,160,000
Available-for-sale Securities, Gross Unrealized Losses	174,000	29,000
Available-for-sale Securities, Fair Value Disclosure	4,049,334,000	3,869,933,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Percentage Of Total Available For Sales Securities	18.20%	23.90%
Residential Mortgage Backed Securities [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	969,267,000	1,167,265,000
Available-for-sale Securities, Gross Unrealized Gains	76,520,000	76,393,000
Available-for-sale Securities, Gross Unrealized Losses	3,723,000	16,424,000
Available-for-sale Securities, Fair Value Disclosure	1,042,064,000	1,227,234,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(241,000)	(1,042,000)
Percentage Of Total Available For Sales Securities	4.70%	7.60%
Asset-backed Securities [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	700,455,000	443,974,000
Available-for-sale Securities, Gross Unrealized Gains	19,898,000	11,692,000
Available-for-sale Securities, Gross Unrealized Losses	28,798,000	53,675,000
Available-for-sale Securities, Fair Value Disclosure	691,555,000	401,991,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(2,259,000)	(5,256,000)
Percentage Of Total Available For Sales Securities	3.10%	2.50%
Commercial Mortgage Backed Securities [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,608,376,000	1,233,958,000
Available-for-sale Securities, Gross Unrealized Gains	142,369,000	87,750,000
Available-for-sale Securities, Gross Unrealized Losses	51,842,000	79,489,000
Available-for-sale Securities, Fair Value Disclosure	1,698,903,000	1,242,219,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	(6,125,000)	(12,225,000)
Percentage Of Total Available For Sales Securities	7.60%	7.70%
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 Basis	231,256,000	341,087,000
Available-for-sale Securities, Gross Unrealized Gains	33,958,000	32,976,000
Available-for-sale Securities, Gross Unrealized Losses	24,000	61,000
Available-for-sale Securities, Fair Value Disclosure	265,190,000	374,002,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Percentage Of Total Available For Sales Securities	1.20%	2.30%
US States and Political Subdivisions Debt Securities [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	270,086,000	184,308,000
Available-for-sale Securities, Gross Unrealized Gains	38,058,000	24,419,000
Available-for-sale Securities, Gross Unrealized Losses	5,646,000	3,341,000
Available-for-sale Securities, Fair Value Disclosure	302,498,000	205,386,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Percentage Of Total Available For Sales Securities	1.40%	1.30%
Foreign Government Debt Securities [Member] | Fixed Maturities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	1,769,784,000	1,372,528,000
Available-for-sale Securities, Gross Unrealized Gains	94,929,000	50,127,000
Available-for-sale Securities, Gross Unrealized Losses	2,714,000	3,576,000
Available-for-sale Securities, Fair Value Disclosure	1,861,999,000	1,419,079,000
Accumulated Other Comprehensive Income (Loss), Other than Temporary Impairment, Not Credit Loss, Net of Tax, Available-for-sale, Debt Securities	0	0
Percentage Of Total Available For Sales Securities	8.30%	8.70%
Nonredeemable Preferred Stock [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	68,469,000	82,488,000
Available-for-sale Securities, Gross Unrealized Gains	6,542,000	4,677,000
Available-for-sale Securities, Gross Unrealized Losses	170,000	8,982,000
Available-for-sale Securities, Fair Value Disclosure	74,841,000	78,183,000
Percentage Of Total Available For Sales Securities	33.60%	68.60%
Equity Securities, Other [Member] | Equity Securities [Member]
Schedule of Available-for-sale Securities [Line Items]
Available-for-sale Securities, Amortized Cost Basis	148,577,000	35,352,000
Available-for-sale Securities, Gross Unrealized Gains	416,000	1,903,000
Available-for-sale Securities, Gross Unrealized Losses	1,134,000	1,538,000
Available-for-sale Securities, Fair Value Disclosure	$ 147,859,000	$ 35,717,000
Percentage Of Total Available For Sales Securities	66.40%	31.40%

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