Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
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	$ 96,192		$ 92,461		$ 95,555		$ 89,658
Included In Earnings
Realized investment gains (losses), net	0		1,567		49		1,576
Asset management fees and other income - Assets1	0		0		0		0
Included in other comprehensive income (loss)	1,243		2,143		(2,817)		2,883
Net investment income1	1,188		1,120		3,518		3,497
Purchases	0		0		1,243		5,400
Sales	0		0		0		(29)
Issuances	0		0		0		0
Settlements	(266)		(1,901)		(4,167)		(7,896)
Other					0
Transfers into Level 3	0	[1]	0	[1]	4,976	[1]	11,992	[1]
Transfers out of Level 3	(4,522)	[1]	0	[1]	(4,522)		(11,691)	[1]
Fair Value, end of period	93,835		95,390		93,835		95,390
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]
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	86,086		51,766		69,298		48,563
Included In Earnings
Realized investment gains (losses), net	0		0		0		0
Asset management fees and other income - Assets1	0		0		0		0
Included in other comprehensive income (loss)	(226)		10		(215)		963
Net investment income1	88		151		404		502
Purchases	0		7,992		25,980		15,492
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	(2,310)		(2,216)		(11,829)		(7,817)
Other	(2,996)				(2,996)
Transfers into Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, end of period	80,642		57,703		80,642		57,703
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]
Debt Securities [Member] | Commercial Mortgage Backed Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	0				0
Included In Earnings
Realized investment gains (losses), net	0				0
Asset management fees and other income - Assets1	0
Included in other comprehensive income (loss)	1				18
Net investment income1	0				0
Purchases	0				17,169
Sales	8,079				0
Issuances	0				0
Settlements	0				0
Other					0
Transfers into Level 3	0	[1]			0	[1]
Transfers out of Level 3	0	[1]			(9,107)	[1]
Fair Value, end of period	8,080				8,080
Included In Earnings
Realized investment gains (losses), net	0	[2]			0	[2]
Asset management fees and other income	0	[2]			0	[2]
Debt Securities [Member] | Residential Mortgage Backed Securities [Member]
Included In Earnings
Asset management fees and other income - Assets1					0
Commercial Mortgage Loans [Member] | Commercial Mortgage Backed Securities [Member]
Included In Earnings
Other					0
Other Long-term Investments [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	407		305		1,054		1,213
Included In Earnings
Realized investment gains (losses), net	(19)		(646)		(740)		(1,623)
Asset management fees and other income - Assets1	14		10		51		12
Included in other comprehensive income (loss)	0		0		0		0
Net investment income1	0		0		0		0
Purchases	75		2,089		112		2,149
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	0		(1)		0		6
Other					0
Transfers into Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, end of period	477		1,757		477		1,757
Included In Earnings
Realized investment gains (losses), net	721	[2]	0	[2]	0	[2]	0	[2]
Asset management fees and other income	14	[2]	10	[2]	51	[2]	12	[2]
Trading Account Assets Supporting Insurance Liabilities [Member] | Equity Securities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	279		197		207		203
Included In Earnings
Realized investment gains (losses), net	0		0		0		0
Asset management fees and other income - Assets1	6		(2)		78		(8)
Included in other comprehensive income (loss)	0		0		0		0
Net investment income1	0		0		0		0
Purchases	0		0		0		0
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	0		0		0		0
Other					0
Transfers into Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, end of period	285		195		285		195
Included In Earnings
Realized investment gains (losses), net	0	[2]	0	[2]	0	[2]	0	[2]
Asset management fees and other income	7	[2]	(2)	[2]	79	[2]	(8)	[2]
Trading Asset [Member] | Equity Securities [Member]
Included In Earnings
Other					0
Other Assets [Member]
Included In Earnings
Fair Value, end of period	8,285				8,285
Other Assets [Member] | Other Activity [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	5,250				1,995
Included In Earnings
Realized investment gains (losses), net	0				0
Asset management fees and other income - Assets1	0				0
Included in other comprehensive income (loss)	39				40
Net investment income1	0				0
Purchases	2,996				6,250
Sales	(2,996)				(2,996)
Issuances	0				0
Settlements	0				0
Other	2,996				2,996
Transfers into Level 3	0	[1]			0	[1]
Transfers out of Level 3	0	[1]			0	[1]
Fair Value, end of period	8,285				8,285
Included In Earnings
Realized investment gains (losses), net	0	[2]			0	[2]
Asset management fees and other income	0	[2]			0	[2]
Future Policy Benefits [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Fair Value, beginning of period	(669,989)		(1,795,715)		(1,793,136)		(1,783,595)
Included In Earnings
Realized investment gains (losses), net	(572,570)		(31,202)		674,014		73,429
Asset management fees and other income - Assets1	0				0		0
Included in other comprehensive income (loss)	0		0		0		0
Net investment income1	0		0		0		0
Purchases	0		0		0		0
Sales	0		0		0		0
Issuances	(61,788)		(59,731)		(185,225)		(176,482)
Settlements	0		0		0		0
Other	0				0
Transfers into Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, end of period	(1,304,347)		(1,886,648)		(1,304,347)		(1,886,648)
Included In Earnings
Realized investment gains (losses), net	(577,920)	[2]	(43,763)	[2]	636,071	[2]	34,583	[2]
Asset management fees and other income	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	654,058		1,761,274		1,732,094		1,747,757
Included In Earnings
Realized investment gains (losses), net	539,919		4,037		(655,869)		(93,818)
Asset management fees and other income - Assets1	0		0		0		0
Included in other comprehensive income (loss)	0		0		0		0
Net investment income1	0		0		0		0
Purchases	58,928		57,012		176,680		168,384
Sales	0		0		0		0
Issuances	0		0		0		0
Settlements	0		0		0		0
Other	0				0
Transfers into Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Transfers out of Level 3	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, end of period	1,252,905		1,822,323		1,252,905		1,822,323
Included In Earnings
Realized investment gains (losses), net	545,040	[2]	16,488	[2]	(618,782)	[2]	(55,459)	[2]
Asset management fees and other income	$ 0	[2]	$ 0	[2]	$ 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) “Other” primarily represents reclasses of certain assets between reporting categories.