Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period			$ 977				$ 0
Included In Earnings
Realized investment gains (losses), net			0				0
Included in other comprehensive income (loss)			(1)				1
Net investment income			0				0
Purchases			0				0
Sales			(746)				(747)
Issuances			0				0
Settlements			0				0
Transfers into Level 3			0	[1]			976	[1]
Transfers out of Level 3			0	[1]			0	[1]
Fair Value, end of period			230				230
Included In Earnings
Realized investment gains (losses), net			0	[2]			0	[2]
Asset management fees and other income			0	[2]			0	[2]
Interest credited to policyholders' account balances			0	[2]			0	[2]
Included in other comprehensive income (loss)			(1)	[2]			1	[2]
Debt Securities [Member] | Corporate Debt Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	103,130		101,585		89,658		74,255
Included In Earnings
Realized investment gains (losses), net	2		10		9		35
Asset management fees and other income	0				0
Included in other comprehensive income (loss)	1,596		1,785		740		540
Net investment income	1,149		1,124		2,377		2,237
Purchases	2,775		7,302		5,400		8,252
Sales	(29)		0		(29)		0
Issuances	(2,775)		0		0		0
Settlements	(1,697)		(902)		(5,995)		(1,644)
Transfers into Level 3	1	[3]	4,308	[1]	11,992	[3]	31,537	[1]
Transfers out of Level 3	(11,691)	[3]	(21,512)	[1]	(11,691)	[3]	(21,512)	[1]
Fair Value, end of period	92,461		93,700		92,461		93,700
Included In Earnings
Realized investment gains (losses), net	0	[2]	0	[2]	0	[2]	0	[2]
Asset management fees and other income	0	[2]	0	[2]	0	[2]	0	[2]
Interest credited to policyholders' account balances	0	[2]	0	[2]	0	[2]	0	[2]
Included in other comprehensive income (loss)	1,574	[2]	1,785	[2]	792	[2]	534	[2]
Debt Securities [Member] | Asset-backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	46,700		54,515		48,563		53,858
Included In Earnings
Realized investment gains (losses), net	0		0		0		0
Asset management fees and other income	0				0
Included in other comprehensive income (loss)	91		369		953		1,132
Net investment income	193		124		351		241
Purchases	7,500		0		7,500		0
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	(2,718)		(1,119)		(5,601)		(1,342)
Transfers into Level 3	0	[3]	0	[1]	0	[3]	0	[1]
Transfers out of Level 3	0	[3]	0	[1]	0	[3]	0	[1]
Fair Value, end of period	51,766		53,889		51,766		53,889
Included In Earnings
Realized investment gains (losses), net	0	[2]	0	[2]	0	[2]	0	[2]
Asset management fees and other income	0	[2]	0	[2]	0	[2]	0	[2]
Interest credited to policyholders' account balances	0	[2]	0	[2]	0	[2]	0	[2]
Included in other comprehensive income (loss)	137	[2]	369	[2]	1,022	[2]	1,132	[2]
Other Long-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	256		244		1,213		0
Included In Earnings
Realized investment gains (losses), net	0		(58)		(977)		186
Asset management fees and other income	(11)				2
Included in other comprehensive income (loss)	0		0		0		0
Net investment income	0		0		0		0
Purchases	60		0		60		0
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	0		0		7		0
Transfers into Level 3	0	[3]	0	[1]	0	[3]	0	[1],[2]
Transfers out of Level 3	0	[3]	0	[1]	0	[3]	0	[1],[2]
Fair Value, end of period	305		186		305		186
Included In Earnings
Realized investment gains (losses), net	874	[2]	(56)	[2]	0	[2]	162	[2]
Asset management fees and other income	(11)	[2]	0	[2]	2	[2]	0	[2]
Interest credited to policyholders' account balances	0	[2]	0	[2]	0	[2]	0	[2]
Included in other comprehensive income (loss)	0	[2]	0	[2]	0	[2]	0	[2]
Other Trading Asset [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	201				203
Included In Earnings
Realized investment gains (losses), net	0				0
Asset management fees and other income	(4)				(6)
Included in other comprehensive income (loss)	0				0
Net investment income	0				0
Purchases	0				0
Sales	0				0
Issuances	0				0
Settlements	0				0
Transfers into Level 3	0	[3]			0	[3]
Transfers out of Level 3	0	[3]			0	[3]
Fair Value, end of period	197				197
Included In Earnings
Realized investment gains (losses), net	0	[2]			0	[2]
Asset management fees and other income	(5)	[2]			(6)	[2]
Interest credited to policyholders' account balances	0	[2]			0	[2]
Included in other comprehensive income (loss)	0	[2]			0	[2]
Separate Accounts Asset [Member]
Included In Earnings
Interest credited to policyholders' account balances	0				0
Future Policy Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	(1,220,550)		48,529		(1,783,595)		(164,283)
Included In Earnings
Realized investment gains (losses), net	(516,861)		(87,815)		104,631		179,758
Asset management fees and other income	0		0		0
Interest credited to policyholders' account balances			0				0
Included in other comprehensive income (loss)	0		0		0		0
Net investment income	0		0		0		0
Purchases, Sales, Issuances and Settlements			0				0
Purchases	0		0		0		0
Sales	0		0		0		0
Issuances	(58,304)		(56,317)		(116,751)		(111,078)
Settlements	0		0		0		0
Foreign currency translation			0				0
Transfers into Level 3	0	[3]	0	[1]	0	[3]	0	[1]
Transfers out of Level 3	0	[3]	0	[1]	0	[3]	0	[1]
Fair Value, end of period	(1,795,715)		(95,603)		(1,795,715)		(95,603)
Included In Earnings
Realized investment gains (losses), net	(529,720)	[2]	(88,232)	[2]	78,346	[2]	175,186	[2]
Asset management fees and other income	0	[2]	0	[2]	0	[2]	0	[2]
Interest credited to policyholders' account balances	0	[2]	0	[2]	0	[2]	0	[2]
Included in other comprehensive income (loss)	0	[2]	0	[2]	0	[2]	0	[2]
Reinsurance Recoverable [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	1,205,262		(19,884)	[4]	1,747,757		186,735
Included In Earnings
Realized investment gains (losses), net	500,397		84,761	[4]	(97,855)		(174,132)
Asset management fees and other income	0				0
Included in other comprehensive income (loss)	0		0	[4]	0		0
Net investment income	0		0	[4]	0		0
Purchases	55,615		53,758	[4]	111,372		106,032
Sales	0		0	[4]	0		0
Issuances	0		0	[4]	0		0
Settlements	0		0	[4]	0		0
Transfers into Level 3	0	[3]	0	[1],[4]	0	[3]	0	[1],[2]
Transfers out of Level 3	0	[3]	0	[1],[4]	0	[3]	0	[1],[2]
Fair Value, end of period	1,761,274		118,635	[4]	1,761,274		118,635	[4]
Included In Earnings
Realized investment gains (losses), net	513,151	[2]	85,394	[2],[4]	(71,947)	[2]	(169,271)	[2]
Asset management fees and other income	0	[2]	0	[2],[4]	0	[2]	0	[2]
Interest credited to policyholders' account balances	0	[2]	0	[2],[4]	0	[2]	0	[2]
Included in other comprehensive income (loss)	$ 0	[2]	$ 0	[2],[4]	$ 0	[2]	$ 0	[2]

[1]   (1) Transfers into or out of level 3 are generally reported as the value as of the beginning of the quarter in which the transfer occurs.

[2]   (2) Unrealized gains or losses related to assets still held at the end of the period do not include amortization or accretion of premiums and discounts.

[3]   (1) Transfers into or out of level 3 are generally reported as the value as of the beginning of the quarter in which the transfer occurs

[4]   (3) Reinsurance Recoverable classified as Other Liabilities at March 31, 2011 were reclassified to Other Assets-Reinsurance Recoverable at June 30, 2011 as they were in a net asset position.