Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012
Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	$ 1,345,289		$ 1,668,563		$ 974,169
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	1,345,289		1,668,563
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(3,100)		(44,299)		34,488
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	356,706	[1]	331,439	[1]	853,848	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(54,386)	[1]	(271,402)	[1]	(60,224)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(273,392)	[1]	(285,586)	[1]	(144,667)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	13,180		33,776		65,283
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(67,058)		(77,930)		(44,611)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	1,310,427		1,345,289		1,668,563
Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	153,505		93,931		81,655
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	153,505		93,931
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,748		821		2,863
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	54,412	[1]	73,563	[1]	77,781	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(744)	[1]	(7,146)	[1]	(48,828)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(34,727)	[1]	(26,661)	[1]	(8,541)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	15,981		24,727		19,632
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(1,744)		(5,455)		(30,751)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	188,094		153,505		93,931
Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	471,848		232,391		193,492
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	471,848		232,391
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,665		17,150		21,463
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	191,662	[1]	264,804	[1]	111,567	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(22,923)	[1]	(26,005)	[1]	(13,140)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(54,175)	[1]	(20,872)	[1]	(16,235)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	11,614		9,031		11,832
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(36,791)		(9,950)		(77,286)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	572,960		471,848		232,391
Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	101,785		167,006		115,976
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	101,785		167,006
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,099		36,731		24,663
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	6,180	[1]	19,420	[1]	31,699	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	(14,626)	[1]	(83,974)	[1]	(14,060)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(3,599)	[1]	(7,970)	[1]	(813)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	5,712		4,081		64,116
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(11,800)		(18,722)		(47,104)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	86,746		101,785		167,006
US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	40,919		4,538		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	40,919		4,538
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,052		(639)		(12)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	581	[1]	128	[1]	4,639	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(13,139)	[1]	(2,633)	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		44,394		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		(4,538)		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	28,529		40,919		4,538
US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	43,776		43,212		10,373
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	43,776		43,212
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	3,282		222		4,491
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(738)	[1]	(657)	[1]	(413)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		979		37,588
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(3,631)		0		(8,825)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	42,711		43,776		43,212
Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	37,997		28,280		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	37,997		28,280
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(59)		(1,570)		(139)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	0	[1]	28,463	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	(1,210)	[1]	(295)	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	9,482		11,887		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(26,542)		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	19,663		37,997		28,280
Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	(176,270)		(243,177)		(361,456)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(176,270)		(243,177)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	22,094		(176,270)		(243,177)
Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	4,962		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	4,962
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(96)		323
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	8,000	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		4,639
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	(4,962)		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	7,904		4,962
Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	(361)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	7,727
Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value			22,031		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value			22,031
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)			(27)		28
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases			0	[1]	22,014	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales			0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements			(22,000)	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3			0		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value			0		22,031
Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value					11,489
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)					843
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases					108	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales					(3,788)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements					0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3					0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3					(9,750)
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value					0
Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value					4,945
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)					0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases					0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales					0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements					(4,496)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3					0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3					0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value					0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(868,725)		(912,361)		(1,028,241)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	(56,234)	[1]	(57,391)	[1]	(63,934)	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0	[1]	74,386	[1]	105,983	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	73,860		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(1,085,166)		(868,725)		(912,361)
Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Other Comprehensive Income (Loss)	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	(797)
Investment Income [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(4,828)		(8,194)		(6,839)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(4,686)		(7,885)		(6,852)
Investment Income [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(93)		19		431
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(97)		47		295
Investment Income [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	7,929		6,430		1,214
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	5,306		6,425		1,156
Investment Income [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	1,892		1,917		2,032
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	1,949		1,741		2,032
Investment Income [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(483)		(156)		(89)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(480)		(156)		(89)
Investment Income [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	39		36		14
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	39		36		14
Investment Income [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(5)		(305)		(44)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(5)		(305)		(44)
Investment Income [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Investment Income [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0
Investment Income [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Investment Income [Member] | Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			(4)		(11)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			(4)		(11)
Investment Income [Member] | Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Investment Income [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Investment Income [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Investment Income [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Investment Related Gains Losses [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(1,984)		(1,078)		(2,884)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		(202)		(1,329)
Investment Related Gains Losses [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(244)		(294)		(311)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		(269)
Investment Related Gains Losses [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	2,131		(1,131)		(516)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		(849)
Investment Related Gains Losses [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	103		(16,704)		(9,503)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		(10,243)		(14,163)
Investment Related Gains Losses [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(401)		(175)		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Investment Related Gains Losses [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	(17)		(16)		(16)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Investment Related Gains Losses [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Investment Related Gains Losses [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	198,364		66,907		118,279
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		66,907		118,279
Investment Related Gains Losses [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0
Investment Related Gains Losses [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Investment Related Gains Losses [Member] | Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Investment Related Gains Losses [Member] | Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					1,098
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					(183)
Investment Related Gains Losses [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Investment Related Gains Losses [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(129,224)		142,050		104,613
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(134,254)		138,683		97,216
Investment Related Gains Losses [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Insurance Claims [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Insurance Claims [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0
Insurance Claims [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Insurance Claims [Member] | Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Insurance Claims [Member] | Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Insurance Claims [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Insurance Claims [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0		0		770
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		56
Insurance Claims [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Interest Income [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Interest Income [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	198,365		0		0
Interest Income [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0
Interest Income [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Interest Income [Member] | Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Interest Income [Member] | Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Interest Income [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Interest Income [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0		(115,409)		(31,552)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	(178,704)		(189,794)		(129,828)
Interest Income [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Corporate Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Residential Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Asset-backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Commercial Mortgage Backed Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | US Treasury and Government [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | US States and Political Subdivisions Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Short-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings			0		0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)			0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Other Debt Obligations [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Reinsurance Ceded Receivable Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings					(449)
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)					(33)
Policy Acquisition Costs And Other Insurance Expenses [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(104,843)		0		0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0
Policy Acquisition Costs And Other Insurance Expenses [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Other Income [Member] | Foreign Government Debt Securities [Member] | Available-for-sale Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Other Income [Member] | Funds Withheld At Interest Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Other Income [Member] | Nonredeemable Preferred Stock [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	0
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Other Income [Member] | Longevity Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	8,088
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	8,088
Other Income [Member] | Interest Sensitive Contract Liabilities Embedded Derivatives [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	0
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0
Other Income [Member] | Mortality Swap [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation Calculation [Roll Forward]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Gain (Loss) Included in Earnings	(797)
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	$ (797)

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