Reinsurance Group of America (RGA) 10-Q 5 Nov 13 2013 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2013	Oct. 31, 2013
Document And Entitiy Information [Abstract]	'	'
Document Type	'10-Q	'
Document period end date	30-Sep-13	'
Amendment flag	'false	'
Entity registrant name	'REINSURANCE GROUP OF AMERICA INC	'
Entity central index key	'0000898174	'
Entity current reporting status	'Yes	'
Entity voluntary filers	'No	'
Current fiscal year end date	'--12-31	'
Entity filer category	'Large Accelerated Filer	'
Entity well-known seasoned issuer	'Yes	'
Common Shares Outstanding	'	70,586,106
Document Fiscal Year Focus	'2013	'
Document Fiscal Period Focus	'Q3	'

CONDENSED_CONSOLIDATED_BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fixed maturity securities:	'	'
Available-for-sale at fair value (amortized cost of $19,917,350 and $19,559,432)	$21,289,108	$22,291,614
Mortgage loans on real estate (net of allowances of $7,669 and $11,580)	2,488,582	2,300,587
Policy loans	1,244,878	1,278,175
Funds withheld at interest	5,739,872	5,594,182
Short-term investments	44,192	288,082
Other invested assets	1,116,391	1,159,543
Total investments	31,923,023	32,912,183
Cash and cash equivalents	1,423,235	1,259,892
Accrued investment income	262,330	201,344
Premiums receivable and other reinsurance balances	1,252,610	1,356,087
Reinsurance ceded receivables	592,948	620,901
Deferred policy acquisition costs	3,533,932	3,619,274
Other assets	538,477	390,757
Total assets	39,526,555	40,360,438
Liabilities and Stockholders’ Equity	'	'
Future policy benefits	11,873,306	11,372,856
Interest-sensitive contract liabilities	12,868,425	13,353,502
Other policy claims and benefits	3,440,371	3,160,250
Other reinsurance balances	264,023	233,630
Deferred income taxes	1,975,819	2,120,501
Other liabilities	510,079	742,249
Long-term debt	2,214,170	1,815,253
Collateral finance facility	484,712	652,010
Total liabilities	33,630,905	33,450,251
Commitments and contingent liabilities (See Note 8)	'	'
Stockholders’ Equity:	'	'
Preferred stock - par value $.01 per share, 10,000,000 shares authorized, no shares issued or outstanding	0	0
Common stock - par value $.01 per share, 140,000,000 shares authorized, 79,137,758 shares issued at September 30, 2013 and December 31, 2012	791	791
Additional paid-in-capital	1,778,307	1,755,421
Retained earnings	3,544,632	3,357,255
Treasury stock, at cost - 8,594,734 and 5,210,427 shares	-528,081	-312,182
Accumulated other comprehensive income	1,100,001	2,108,902
Total stockholders’ equity	5,895,650	6,910,187
Total liabilities and stockholders’ equity	$39,526,555	$40,360,438

CONDENSED_CONSOLIDATED_BALANCE1

CONDENSED CONSOLIDATED BALANCE SHEETS PARENTHETICAL (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Available for Sale at Fair value - Amortized cost	$19,917,350	$19,559,432
Preferred stock par value (per share)	$0.01	$0.01
Preferred stock shares authorized	10,000,000	10,000,000
Preferred stock shares issued	'	'
Preferred stock shares outstanding	'	'
Common stock par value (per share)	$0.01	$0.01
Common stock shares authorized	140,000,000	140,000,000
Common stock shares issued	79,137,758	79,137,758
Common stock shares outstanding	70,543,024	73,927,331
Treasury stock, shares	8,594,734	5,210,427
Allowances for Loan and Lease Losses, Real Estate	$7,669	$11,580

CONDENSED_CONSOLIDATED_STATEME

CONDENSED CONSOLIDATED STATEMENTS OF INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Revenues:	'	'	'	'
Net premiums	$2,026,180	$1,912,746	$6,041,029	$5,726,889
Investment income, net of related expenses	369,366	396,781	1,238,731	1,066,055
Investment related gains (losses), net:	'	'	'	'
Other-than-temporary impairments on fixed maturity securities	-391	-1,996	-10,396	-11,562
Other-than-temporary impairments on fixed maturity securities transferred to (from) accumulated other comprehensive income	59	-559	-247	-7,618
Other investment related gains (losses), net	-76,133	78,608	76,792	162,554
Total investment related gains (losses), net	-76,465	76,053	66,149	143,374
Other revenues	70,734	63,501	235,650	181,491
Total revenues	2,389,815	2,449,081	7,581,559	7,117,809
Benefits and Expenses:	'	'	'	'
Claims and other policy benefits	1,714,899	1,662,625	5,434,383	4,868,220
Interest credited	59,939	130,341	303,767	285,080
Policy acquisition costs and other insurance expenses	268,081	318,106	995,943	961,679
Other operating expenses	111,672	103,786	344,581	319,425
Interest expense	30,831	29,749	89,235	76,431
Collateral finance facility expense	2,698	2,995	7,886	8,840
Total benefits and expenses	2,188,120	2,247,602	7,175,795	6,519,675
Income before income taxes	201,695	201,479	405,764	598,134
Provision for income taxes	63,740	57,004	131,886	189,230
Net income	$137,955	$144,475	$273,878	$408,904
Earnings per share:	'	'	'	'
Basic earnings per share	$1.95	$1.96	$3.79	$5.55
Diluted earnings per share	$1.93	$1.95	$3.76	$5.52
Dividends declared per share	$0.30	$0.24	$0.78	$0.60

CONSOLIDATED_STATEMENTS_OF_COM

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Comprehensive income (loss)	'	'	'	'
Net income	$137,955	$144,475	$273,878	$408,904
Other comprehensive income (loss), net of tax:	'	'	'	'
Change in foreign currency translation adjustments	27,139	36,248	-75,798	43,463
Change in net unrealized gains and losses on investments	-112,035	315,501	-938,216	483,242
Change in other-than-temporary impairment losses on fixed maturity securities	2,246	364	2,896	4,952
Changes in pension and other postretirement plan adjustments	517	336	2,217	1,837
Total other comprehensive income (loss), net of tax	-82,133	352,449	-1,008,901	533,494
Total comprehensive income (loss)	$55,822	$496,924	($735,023)	$942,398

CONDENSED_CONSOLIDATED_STATEME1

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Statement of Cash Flows [Abstract]	'	'
Cash Acquired from Acquisition	$9,709	'
Cash Flows from Operating Activities:	'	'
Net income	273,878	408,904
Change in operating assets and liabilities:	'	'
Accrued investment income	-63,339	-60,684
Premiums receivable and other reinsurance balances	81,189	-102,447
Deferred policy acquisition costs	56,286	-70,107
Reinsurance ceded receivable balances	49,286	2,240
Future policy benefits, other policy claims and benefits, and other reinsurance balances	1,005,756	1,406,844
Deferred income taxes	276,372	-99,200
Other assets and other liabilities, net	-293,106	225,749
Amortization of net investment premiums, discounts and other	-70,687	-61,644
Investment related gains, net	-66,149	-143,374
Gain on repurchase of collateral finance facility securities	-46,506	0
Excess tax benefits from share-based payment arrangement	-2,410	262
Other, net	50,460	22,533
Net cash provided by operating activities	1,251,030	1,529,076
Cash Flows from Investing Activities:	'	'
Sales of fixed maturity securities available-for-sale	2,838,099	3,970,569
Maturities of fixed maturity securities available-for-sale	118,951	122,405
Purchases of fixed maturity securities available-for-sale	-3,496,639	-4,660,131
Cash invested in mortgage loans	-467,429	-350,823
Cash invested in policy loans	0	-8,032
Cash invested in funds withheld at interest	-70,753	-81,602
Principal payments on mortgage loans on real estate	262,226	85,921
Principal payments on policy loans	33,314	24,934
Payments to Acquire Businesses, Net of Cash Acquired	-2,805	0
Change in short-term investments	235,260	98,007
Change in other invested assets	35,341	-227,881
Net cash used in investing activities	-514,435	-1,026,633
Cash Flows from Financing Activities:	'	'
Dividends to stockholders	-56,465	-44,220
Repurchase and repayment of collateral finance facility securities	-119,255	0
Proceeds from Issuance of Long-term Debt	398,492	400,000
Payments of Debt Issuance Costs	-3,400	-6,255
Purchases of treasury stock	-269,204	-6,924
Excess tax benefits from share-based payment arrangement	2,410	-262
Exercise of stock options, net	9,212	4,096
Change in cash collateral for derivatives and other arrangements	-68,635	-62,896
Deposits on universal life and other investment type policies and contracts	120,250	89,458
Withdrawals on universal life and other investment type policies and contracts	-550,122	-249,190
Net cash (used in) provided by financing activities	-536,717	123,807
Effect of exchange rate changes on cash	-36,535	14,610
Change in cash and cash equivalents	163,343	640,860
Cash and cash equivalents, beginning of period	1,259,892	962,870
Cash and cash equivalents, end of period	1,423,235	1,603,730
Supplementary information:	'	'
Cash paid for interest	75,003	76,514
Cash paid for income taxes, net of refunds	$100,429	$81,391

Organization_and_Basis_of_Pres

Organization and Basis of Presentation	9 Months Ended
	Sep. 30, 2013
Organization, Consolidation and Presentation of Financial Statements [Abstract]	'
Organization and Basis of Presentation	'
	Organization and Basis of Presentation
	Reinsurance Group of America, Incorporated (“RGA”) is an insurance holding company that was formed on December 31, 1992. The accompanying unaudited condensed consolidated financial statements of RGA and its subsidiaries (collectively, the “Company”) have been prepared in conformity with accounting principles generally accepted in the United States of America for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, these financial statements do not include all of the information and footnotes required by accounting principles generally accepted in the United States of America for complete financial statements. In the opinion of management, all adjustments, consisting of normal recurring accruals, considered necessary for a fair presentation have been included. Results for the nine months ended September 30, 2013 are not necessarily indicative of the results that may be expected for the year ending December 31, 2013. There were no subsequent events that would require disclosure or adjustments to the accompanying condensed consolidated financial statements through the date the financial statements were issued. These unaudited condensed consolidated financial statements include the accounts of RGA and its subsidiaries, all intercompany accounts and transactions have been eliminated. They should be read in conjunction with the Company’s 2012 Annual Report on Form 10-K (“2012 Annual Report”) filed with the Securities and Exchange Commission (“SEC”) on March 1, 2013

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Earnings:
	Net income (loss) (numerator for basic and diluted calculations)	$	137,955	$	144,475	$	273,878	$	408,904
	Shares:
	Weighted average outstanding shares (denominator for basic calculation)	70,865		73,776		72,342		73,690
	Equivalent shares from outstanding stock options	526		362		498		388
	Denominator for diluted calculation	71,391		74,138		72,840		74,078
	Earnings per share:
	Basic	$	1.95	$	1.96	$	3.79	$	5.55
	Diluted	$	1.93	$	1.95	$	3.76	$	5.52
	The calculation of common equivalent shares does not include the impact of options having a strike or conversion price that exceeds the average stock price for the earnings period, as the result would be antidilutive. The calculation of common equivalent shares also excludes the impact of outstanding performance contingent shares, as the conditions necessary for their issuance have not been satisfied as of the end of the reporting period. For the three months ended September 30, 2013, no stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. For the three months ended September 30, 2012, approximately 0.7 million stock options and approximately 0.7 million performance contingent shares were excluded from the calculation. Year-to-date amounts for equivalent shares from outstanding stock options and performance contingent shares are the weighted average of the individual quarterly amounts.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
Accumulated Other Comprehensive Income	'
	Accumulated Other Comprehensive Income
	The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the nine months ended September 30, 2013 and 2012 are as follows (dollars in thousands):
			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated			Unrealized			Pension and			Total
			Currency			Appreciation			Postretirement
			Translation			(Depreciation)			Benefits
			Adjustments			of Investments(1)
	Balance, December 31, 2012		$	267,475		$	1,877,657		$	(36,230	)	$	2,108,902
	Other comprehensive income (loss) before reclassifications		(75,798		)	(936,847		)	(82		)	(1,012,727		)
	Amounts reclassified to AOCI		—			1,527			2,299			3,826
	Net current-period other comprehensive income (loss)		(75,798		)	(935,320		)	2,217			(1,008,901		)
	Balance, September 30, 2013		$	191,677		$	942,337		$	(34,013	)	$	1,100,001
			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated			Unrealized			Pension and			Total
			Currency			Appreciation			Postretirement
			Translation			(Depreciation)			Benefits
			Adjustments			of Investments(1)
	Balance, December 31, 2011		$	229,795		$	1,419,318		$	(30,960	)	$	1,618,153
	Change in component during the period		43,463			488,194			1,837			533,494
	Balance, September 30, 2012		$	273,258		$	1,907,512		$	(29,123	)	$	2,151,647
	-1	Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.
	The following table presents the amounts of AOCI reclassifications for the three and nine months ended September 30, 2013 (dollars in thousands):
			Amount Reclassified from AOCI
	Details about AOCI Components		Three months ended September 30, 2013			Nine months ended September 30, 2013			Affected Line Item in Statement of Income
	Unrealized gains and losses on available-for-sale securities		$	(12,736	)	$	11,122		Investment related gains (losses), net
	Gains and losses on cash flow hedge - interest rate swap		291			796			Investment income
	Deferred policy acquisition costs attributed to unrealized gains and losses(1)		(602		)	(15,433		)
			(13,047		)	(3,515		)	Total before tax
			5,009			1,988			Tax expense
			$	(8,038	)	$	(1,527	)	Net of tax
	Amortization of unrealized pension and postretirement benefits:
	Prior service cost(2)		$	(152	)	$	(459	)
	Actuarial gains/(losses)(2)		(1,087		)	(3,078		)
			(1,239		)	(3,537		)	Total before tax
			434			1,238			Tax benefit
			$	(805	)	$	(2,299	)	Net of tax
	Total reclassifications for the period		$	(8,843	)	$	(3,826	)	Net of tax
	-1	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2012 Annual Report for additional details.
	-2	These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details

Investments

Investments	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Investments	'
	Investments
	Fixed Maturity and Equity Securities Available-for-Sale
	The following tables provide information relating to investments in fixed maturity and equity securities by sector as of September 30, 2013 and December 31, 2012 (dollars in thousands):
	September 30, 2013:		Amortized				Unrealized				Unrealized				Estimated Fair			% of		Other-than-
																				temporary impairments
			Cost				Gains				Losses				Value			Total		in AOCI
	Available-for-sale:
	Corporate securities		$	11,505,673			$	637,691			$	208,802			$	11,934,562		56.1	%	$	—
	Canadian and Canadian provincial governments		2,719,147				785,840				13,831				3,491,156			16.4		—
	Residential mortgage-backed securities		922,581				44,948				15,691				951,838			4.5		(300		)
	Asset-backed securities		883,495				19,264				17,481				885,278			4.1		(2,259		)
	Commercial mortgage-backed securities		1,371,473				102,207				20,566				1,453,114			6.8		(1,609		)
	U.S. government and agencies		413,254				20,412				2,819				430,847			2		—
	State and political subdivisions		288,757				22,626				13,654				297,729			1.4		—
	Other foreign government, supranational and foreign government-sponsored enterprises		1,812,970				50,246				18,632				1,844,584			8.7		—
	Total fixed maturity securities		$	19,917,350			$	1,683,234			$	311,476			$	21,289,108		100	%	$	(4,168	)
	Non-redeemable preferred stock		$	80,985			$	5,187			$	3,333			$	82,839		56.4	%
	Other equity securities		68,123				—				4,052				64,071			43.6
	Total equity securities		$	149,108			$	5,187			$	7,385			$	146,910		100	%
	December 31, 2012:		Amortized				Unrealized				Unrealized				Estimated Fair			% of		Other-than-
																				temporary impairments
			Cost				Gains				Losses				Value			Total		in AOCI
	Available-for-sale:
	Corporate securities		$	11,333,431			$	1,085,973			$	39,333			$	12,380,071		55.5	%	$	—
	Canadian and Canadian provincial governments		2,676,777				1,372,731				174				4,049,334			18.2		—
	Residential mortgage-backed securities		969,267				76,520				3,723				1,042,064			4.7		(241		)
	Asset-backed securities		700,455				19,898				28,798				691,555			3.1		(2,259		)
	Commercial mortgage-backed securities		1,608,376				142,369				51,842				1,698,903			7.6		(6,125		)
	U.S. government and agencies		231,256				33,958				24				265,190			1.2		—
	State and political subdivisions		270,086				38,058				5,646				302,498			1.4		—
	Other foreign government, supranational and foreign government-sponsored enterprises		1,769,784				94,929				2,714				1,861,999			8.3		—
	Total fixed maturity securities		$	19,559,432			$	2,864,436			$	132,254			$	22,291,614		100	%	$	(8,625	)
	Non-redeemable preferred stock		$	68,469			$	6,542			$	170			$	74,841		33.6	%
	Other equity securities		148,577				416				1,134				147,859			66.4
	Total equity securities		$	217,046			$	6,958			$	1,304			$	222,700		100	%
	The Company enters into various collateral arrangements that require both the pledging and acceptance of fixed maturity securities as collateral. The Company pledged fixed maturity securities as collateral to derivative and reinsurance counterparties with an amortized cost of $53.8 million and $16.9 million, and an estimated fair value of $54.5 million and $17.0 million, as of September 30, 2013 and December 31, 2012 respectively. The pledged fixed maturity securities are included in fixed maturity securities, available-for-sale in the condensed consolidated balance sheets as of September 30, 2013, and are included in other invested assets in the condensed consolidated balance sheets as of December 31, 2012. Securities with an amortized cost of $7,954.6 million and $7,549.0 million, and an estimated fair value of $8,260.6 million and $7,913.8 million, as of September 30, 2013 and December 31, 2012, respectively, were held in trust to satisfy collateral requirements under certain third-party reinsurance treaties.
	The Company received fixed maturity securities as collateral from derivative and reinsurance counterparties with an estimated fair value of $92.2 million and $95.6 million, as of September 30, 2013 and December 31, 2012, respectively. The collateral is held in separate custodial accounts and is not recorded on the Company’s condensed consolidated balance sheets. Subject to certain constraints, the Company is permitted by contract to sell or re-pledge this collateral; however, as of September 30, 2013 and December 31, 2012, none of the collateral had been sold or re-pledged.
	As of September 30, 2013, the Company held securities with a fair value of $1,238.5 million that were guaranteed or issued by the Canadian province of Ontario and $1,479.4 million that were guaranteed or issued by the Canadian province of Quebec, both of which exceeded 10% of total stockholders’ equity. As of December 31, 2012, the Company held securities with a fair value of $1,400.0 million that were guaranteed or issued by the Canadian province of Ontario and $1,785.0 million that were guaranteed or issued by the Canadian province of Quebec, both of which exceeded 10% of total stockholders’ equity.
	The amortized cost and estimated fair value of fixed maturity securities available-for-sale at September 30, 2013 are shown by contractual maturity in the table below. Actual maturities can differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties. Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date. At September 30, 2013, the contractual maturities of investments in fixed maturity securities were as follows (dollars in thousands):
			Amortized				Fair
			Cost				Value
	Available-for-sale:
	Due in one year or less		$	416,152			$	421,874
	Due after one year through five years		3,712,227				3,890,251
	Due after five years through ten years		6,800,712				7,027,350
	Due after ten years		5,810,710				6,659,403
	Asset and mortgage-backed securities		3,177,549				3,290,230
	Total		$	19,917,350			$	21,289,108
	The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of September 30, 2013 and December 31, 2012 (dollars in thousands):
	September 30, 2013:						Estimated
			Amortized Cost				Fair Value				% of Total
	Finance		$	3,728,120			$	3,870,583			32.4	%
	Industrial		5,926,283				6,125,796				51.3
	Utility		1,829,273				1,916,477				16.1
	Other		21,997				21,706				0.2
	Total		$	11,505,673			$	11,934,562			100	%
	December 31, 2012:						Estimated
			Amortized Cost				Fair Value				% of Total
	Finance		$	3,619,455			$	3,900,152			31.5	%
	Industrial		5,881,967				6,443,846				52
	Utility		1,799,658				2,002,611				16.2
	Other		32,351				33,462				0.3
	Total		$	11,333,431			$	12,380,071			100	%
Other-Than-Temporary Impairments
As discussed in Note 2 – “Summary of Significant Accounting Policies” of the 2012 Annual Report, a portion of certain other-than-temporary impairment (“OTTI”) losses on fixed maturity securities are recognized in AOCI. For these securities the net amount recognized in earnings (“credit loss impairments”) represents the difference between the amortized cost of the security and the net present value of its projected future cash flows discounted at the effective interest rate implicit in the debt security prior to impairment. Any remaining difference between the fair value and amortized cost is recognized in AOCI. The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):
		Three months ended September 30,
						2012
		2013
Balance, beginning of period		$	13,324			$	45,903
Initial impairments - credit loss OTTI recognized on securities not previously impaired		—				—
Additional impairments - credit loss OTTI recognized on securities previously impaired		134				1,306
Credit loss OTTI previously recognized on securities impaired to fair value during the period		—				(2,622		)
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(1,762		)		(20,725		)
Balance, end of period		$	11,696			$	23,862
		Nine months ended September 30,
		2013				2012
Balance, beginning of period		$	16,675			$	63,947
Initial impairments - credit loss OTTI recognized on securities not previously impaired		—				1,962
Additional impairments - credit loss OTTI recognized on securities previously impaired		134				10,187
Credit loss OTTI previously recognized on securities impaired to fair value during the period		(1,449		)		(22,291		)
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(3,664		)		(29,943		)
Balance, end of period		$	11,696			$	23,862
Purchased Credit Impaired Fixed Maturity Securities Available-for-Sale
Securities acquired with evidence of credit quality deterioration since origination and for which it is probable at the acquisition date that the Company will be unable to collect all contractually required payments are classified as purchased credit impaired securities. For each security, the excess of the cash flows expected to be collected as of the acquisition date over its acquisition date fair value is referred to as the accretable yield and is recognized as net investment income on an effective yield basis. At the date of acquisition, the timing and amount of the cash flows expected to be collected was determined based on a best estimate using key assumptions, such as interest rates, default rates and prepayment speeds. If subsequently, based on current information and events, it is probable that there is a significant increase in cash flows previously expected to be collected or if actual cash flows are significantly greater than cash flows previously expected to be collected, the accretable yield is adjusted prospectively. The excess of the contractually required payments (including interest) as of the acquisition date over the cash flows expected to be collected as of the acquisition date is referred to as the nonaccretable difference, and this amount is not expected to be realized as net investment income. Decreases in cash flows expected to be collected can result in OTTI.
The following tables present information on the Company’s purchased credit impaired securities, which are included in fixed maturity securities available-for-sale (dollars in thousands):
		30-Sep-13				December 31, 2012
Outstanding principal and interest balance(1)		$	186,379			$	108,831
Carrying value, including accrued interest(2)		$	135,862			$	84,765
-1	Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
-2	Estimated fair value plus accrued interest.
The following table presents information about purchased credit impaired investments acquired during the periods, as of their acquisition dates (dollars in thousands).
	Nine months ended September 30,
	2013				2012
Contractually required payments (including interest)	$	126,869			$	50,268
Cash flows expected to be collected(1)	101,205				42,316
Fair value of investments acquired	66,880				30,853
-1	Represents undiscounted principal and interest cash flow expectations at the date of acquisition.
The following table presents activity for the accretable yield on purchased credit impaired securities for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
	Three months ended September 30,								Nine months ended September 30,
	2013				2012				2013				2012
Balance, beginning of period	$	66,269			$	—			$	39,239			$	—
Investments purchased	4,374				11,463				34,325				11,463
Accretion	(1,952		)		(6		)		(5,774		)		(6		)
Disposals	—				—				(832		)		—
Reclassification from nonaccretable difference	1,388				—				3,121				—
Balance, end of period	$	70,079			$	11,457			$	70,079			$	11,457
Unrealized Losses for Fixed Maturity and Equity Securities Available-for-Sale
The following table presents the total gross unrealized losses for the 1,397 and 567 fixed maturity and equity securities as of September 30, 2013 and December 31, 2012, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
		30-Sep-13							31-Dec-12
		Gross				% of Total			Gross				% of Total
		Unrealized							Unrealized
		Losses							Losses
Less than 20%		$	286,594			89.9	%		$	54,951			41.2	%
20% or more for less than six months		6,325				2			734				0.5
20% or more for six months or greater		25,942				8.1			77,873				58.3
Total		$	318,861			100	%		$	133,558			100	%
The Company’s determination of whether a decline in value is other-than-temporary includes analysis of the underlying credit and the extent and duration of a decline in value. The Company’s credit analysis of an investment includes determining whether the issuer is current on its contractual payments, evaluating whether it is probable that the Company will be able to collect all amounts due according to the contractual terms of the security and analyzing the overall ability of the Company to recover the amortized cost of the investment. In the Company’s impairment review process, the duration and severity of an unrealized loss position for equity securities are given greater weight and consideration given the lack of contractual cash flows or deferability features.
The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,397 and 567 fixed maturity and equity securities that have estimated fair values below amortized cost as of September 30, 2013 and December 31, 2012, respectively (dollars in thousands). These investments are presented by class and grade of security, as well as the length of time the related fair value has remained below amortized cost.
		Less than 12 months								12 months or greater							Total
						Gross								Gross						Gross
September 30, 2013:		Estimated				Unrealized				Estimated				Unrealized			Estimated			Unrealized
		Fair Value				Losses				Fair Value				Losses			Fair Value			Losses
Investment grade securities:
Corporate securities		$	3,158,429			$	168,659			$	130,027			$	20,031		$	3,288,456		$	188,690
Canadian and Canadian provincial governments		140,648				12,530				6,898				1,301			147,546			13,831
Residential mortgage-backed securities		207,602				11,909				18,997				2,257			226,599			14,166
Asset-backed securities		270,863				4,602				53,786				5,571			324,649			10,173
Commercial mortgage-backed securities		188,153				6,565				22,435				5,968			210,588			12,533
U.S. government and agencies		72,032				2,658				3,958				161			75,990			2,819
State and political subdivisions		95,935				8,776				14,981				4,878			110,916			13,654
Other foreign government, supranational and foreign government-sponsored enterprises		644,427				17,479				10,589				1,153			655,016			18,632
Total investment grade securities		4,778,089				233,178				261,671				41,320			5,039,760			274,498
Non-investment grade securities:
Corporate securities		311,613				12,155				42,024				7,957			353,637			20,112
Residential mortgage-backed securities		53,633				1,068				2,254				457			55,887			1,525
Asset-backed securities		29,043				467				30,901				6,841			59,944			7,308
Commercial mortgage-backed securities		971				25				10,905				8,008			11,876			8,033
Total non-investment grade securities		395,260				13,715				86,084				23,263			481,344			36,978
Total fixed maturity securities		$	5,173,349			$	246,893			$	347,755			$	64,583		$	5,521,104		$	311,476
Non-redeemable preferred stock		$	42,338			$	3,331			$	1			$	2		$	42,339		$	3,333
Other equity securities		47,151				2,619				17,028				1,433			64,179			4,052
Total equity securities		$	89,489			$	5,950			$	17,029			$	1,435		$	106,518		$	7,385
		Less than 12 months								12 months or greater							Total
						Gross								Gross						Gross
December 31, 2012:		Estimated				Unrealized				Estimated				Unrealized			Estimated			Unrealized
		Fair Value				Losses				Fair Value				Losses			Fair Value			Losses
Investment grade securities:
Corporate securities		$	786,203			$	13,276			$	108,187			$	17,386		$	894,390		$	30,662
Canadian and Canadian provincial governments		12,349				174				—				—			12,349			174
Residential mortgage-backed securities		22,288				97				19,394				3,199			41,682			3,296
Asset-backed securities		59,119				449				96,179				9,508			155,298			9,957
Commercial mortgage-backed securities		89,507				797				29,181				7,974			118,688			8,771
U.S. government and agencies		7,272				24				—				—			7,272			24
State and political subdivisions		20,602				1,514				11,736				4,132			32,338			5,646
Other foreign government, supranational and foreign government-sponsored enterprises		244,817				1,953				7,435				761			252,252			2,714
Total investment grade securities		1,242,157				18,284				272,112				42,960			1,514,269			61,244
Non-investment grade securities:
Corporate securities		181,168				3,170				39,123				5,501			220,291			8,671
Residential mortgage-backed securities		15,199				80				2,633				347			17,832			427
Asset-backed securities		3,421				26				31,938				18,815			35,359			18,841
Commercial mortgage-backed securities		3,317				764				68,405				42,307			71,722			43,071
Total non-investment grade securities		203,105				4,040				142,099				66,970			345,204			71,010
Total fixed maturity securities		$	1,445,262			$	22,324			$	414,211			$	109,930		$	1,859,473		$	132,254
Non-redeemable preferred stock		$	5,577			$	52			$	5,679			$	118		$	11,256		$	170
Other equity securities		85,374				1,134				—				—			85,374			1,134
Total equity securities		$	90,951			$	1,186			$	5,679			$	118		$	96,630		$	1,304
As of September 30, 2013, the Company does not intend to sell these fixed maturity securities and does not believe it is more likely than not that it will be required to sell these fixed maturity securities before the recovery of the fair value up to the current amortized cost of the investment, which may be maturity. As of September 30, 2013, the Company has the ability and intent to hold the equity securities until the recovery of the fair value up to the current cost of the investment. However, unforeseen facts and circumstances may cause the Company to sell fixed maturity and equity securities in the ordinary course of managing its portfolio to meet certain diversification, credit quality, asset-liability management and liquidity guidelines.
Unrealized losses on non-investment grade securities are principally related to high-yield corporate securities due to interest rate movements during the first nine months of 2013. As of September 30, 2013 and December 31, 2012, approximately $20.1 million and $8.7 million, respectively, of gross unrealized losses were associated with non-investment grade corporate securities. Unrealized losses on non-investment grade securities related to asset and mortgage-backed securities decreased significantly during 2013 driven principally by commercial mortgage-backed securities. As of September 30, 2013 and December 31, 2012, approximately $15.3 million and $61.5 million, respectively, of gross unrealized losses greater than 12 months were associated with non-investment grade asset and mortgage-backed securities. During the first nine months of 2013, commercial mortgage-backed securities benefited from improvement in delinquency rates and the Company sold several non-investment grade commercial mortgage-backed securities.
Investment Income, Net of Related Expenses
Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
Fixed maturity securities available-for-sale		$	243,938			$	221,212			$	723,772			$	633,110
Mortgage loans on real estate		33,013				26,938				89,618				67,258
Policy loans		15,743				16,519				49,103				49,637
Funds withheld at interest		80,024				127,855				376,495				305,861
Short-term investments		374				960				1,609				3,027
Investment receivable		—				—				—				—
Other invested assets		9,411				13,117				36,712				35,803
Investment revenue		382,503				406,601				1,277,309				1,094,696
Investment expense		(13,137		)		(9,820		)		(38,578		)		(28,641		)
Investment income, net of related expenses		$	369,366			$	396,781			$	1,238,731			$	1,066,055
Investment Related Gains (Losses), Net
Investment related gains (losses), net consist of the following (dollars in thousands):
	Three months ended September 30,								Nine months ended September 30,
	2013				2012				2013				2012
Fixed maturities and equity securities available for sale:
Other-than-temporary impairment losses on fixed maturities	$	(391	)		$	(1,996	)		$	(10,396	)		$	(11,562	)
Portion of loss recognized in accumulated other comprehensive income (before taxes)	59				(559		)		(247		)		(7,618		)
Net other-than-temporary impairment losses on fixed maturities recognized in earnings	(332		)		(2,555		)		(10,643		)		(19,180		)
Impairment losses on equity securities	—				—				—				(3,025		)
Gain on investment activity	21,560				53,173				70,085				102,078
Loss on investment activity	(30,434		)		(6,668		)		(48,406		)		(23,090		)
Other impairment losses and change in mortgage loan provision	233				(10,301		)		(1,268		)		(14,382		)
Derivatives and other, net	(67,492		)		42,404				56,381				100,973
Total investment related gains (losses), net	$	(76,465	)		$	76,053			$	66,149			$	143,374
The other-than-temporary impairment losses on fixed maturity securities in the third quarter and first nine months of 2013 were primarily due to the decision to sell certain subordinated commercial mortgage-backed securities. The other-than-temporary impairments in the first nine months of 2012 were primarily due to a decline in value of structured securities with exposure to commercial mortgages and general credit deterioration in select corporate and foreign securities. The decrease in derivatives and other in the third quarter was primarily due to a decrease in the fair value of embedded derivatives. The decrease in derivatives and other for the first nine months was primarily due to decreases in the fair value of free-standing interest rate swap derivatives due to the rising interest rate environment.
During the three months ended September 30, 2013 and 2012, the Company sold fixed maturity and equity securities with fair values of $410.4 million and $220.5 million at losses of $30.4 million and $6.7 million, respectively. During the nine months ended September 30, 2013 and 2012, the Company sold fixed maturity and equity securities with fair values of $872.2 million and $622.1 million at losses of $48.4 million and $23.1 million, respectively. The Company generally does not engage in short-term buying and selling of securities.
Securities Borrowing and Other
The Company participates in a securities borrowing program whereby securities, which are not reflected on the Company’s condensed consolidated balance sheets, are borrowed from a third party. The Company is required to maintain a minimum of 100% of the fair value of the borrowed securities as collateral, which consists of rights to reinsurance treaty cash flows. The Company had borrowed securities with an amortized cost of $87.5 million as of September 30, 2013 and December 31, 2012, which was equal to the fair value in both periods. The borrowed securities are used to provide collateral under an affiliated reinsurance transaction.
The Company also participates in a repurchase/reverse repurchase program in which securities, reflected as investments on the Company’s condensed consolidated balance sheets, are pledged to a third party. In return, the Company receives securities from the third party with an estimated fair value equal to a minimum of 100% of the securities pledged. The securities received are not reflected on the Company’s condensed consolidated balance sheets. As of September 30, 2013 the Company had pledged securities with an amortized cost of $292.4 million and an estimated fair value of $307.0 million, and in return the Company received securities with an estimated fair value of $347.5 million. As of December 31, 2012 the Company had pledged securities with an amortized cost of $290.2 million and an estimated fair value of $305.9 million, and in return the Company received securities with an estimated fair value of $342.0 million.
Mortgage Loans on Real Estate
Mortgage loans represented approximately 7.8% and 7.0% of the Company’s total investments as of September 30, 2013 and December 31, 2012. The Company makes mortgage loans on income producing properties, such as apartments, retail and office buildings, and light industrial facilities. Loan-to-value ratios at the time of loan approval are 75% or less. The distribution of mortgage loans, gross of valuation allowances, by property type is as follows as of September 30, 2013 and December 31, 2012 (dollars in thousands):
		30-Sep-13							31-Dec-12
		Recorded				% of Total			Recorded				% of Total
		Investment							Investment
Apartment		$	290,678			11.7	%		$	229,266			9.9	%
Retail		796,144				31.9			669,958				29
Office building		854,870				34.2			825,406				35.7
Industrial		444,186				17.8			455,682				19.7
Other commercial		110,373				4.4			131,855				5.7
Total		$	2,496,251			100	%		$	2,312,167			100	%
As of September 30, 2013 and December 31, 2012, the Company’s mortgage loans, gross of valuation allowances, were distributed throughout the United States as follows (dollars in thousands):
		30-Sep-13							31-Dec-12
		Recorded				% of Total			Recorded				% of Total
		Investment							Investment
Pacific		$	658,054			26.4	%		$	593,589			25.7	%
South Atlantic		581,781				23.3			477,068				20.5
Mountain		260,794				10.4			233,174				10.1
Middle Atlantic		269,602				10.8			300,475				13
West North Central		181,937				7.3			168,063				7.3
East North Central		239,997				9.6			224,122				9.7
West South Central		155,061				6.2			161,451				7
East South Central		67,155				2.7			62,789				2.7
New England		81,870				3.3			91,436				4
Total		$	2,496,251			100	%		$	2,312,167			100	%
The maturities of the mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands):
		30-Sep-13							31-Dec-12
		Recorded				% of Total			Recorded				% of Total
		Investment							Investment
Due within five years		$	1,024,065			41	%		$	1,187,387			51.3	%
Due after five years through ten years		963,479				38.6			776,655				33.6
Due after ten years		508,707				20.4			348,125				15.1
Total		$	2,496,251			100	%		$	2,312,167			100	%
Information regarding the Company’s credit quality indicators for its recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
		30-Sep-13							31-Dec-12
Internal credit risk grade:		Recorded				% of Total			Recorded				% of Total
		Investment							Investment
High investment grade		$	1,556,974			62.4	%		$	1,235,605			53.5	%
Investment grade		754,369				30.2			834,494				36.1
Average		106,912				4.3			132,607				5.7
Watch list		49,173				2			76,463				3.3
In or near default		28,823				1.1			32,998				1.4
Total		$	2,496,251			100	%		$	2,312,167			100	%
The age analysis of the Company’s past due recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
		30-Sep-13				31-Dec-12
		$	—			$	7,504
31-60 days past due
		—				—
61-90 days past due
		3,046				16,886
Greater than 90 days
		3,046				24,390
Total past due
		2,493,205				2,287,777
Current
		$	2,496,251			$	2,312,167
Total
The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of September 30, 2013 and December 31, 2012 (dollars in thousands):
		30-Sep-13				31-Dec-12
Mortgage loans:
Individually measured for impairment		$	32,624			$	39,956
Collectively measured for impairment		2,463,627				2,272,211
Mortgage loans, gross of valuation allowances		2,496,251				2,312,167
Valuation allowances:
Individually measured for impairment		4,691				6,980
Collectively measured for impairment		2,978				4,600
Total valuation allowances		7,669				11,580
		$	2,488,582			$	2,300,587
Mortgage loans, net of valuation allowances
Information regarding the Company’s loan valuation allowances for mortgage loans for the three and nine months ended September 30, 2013 and 2012 is as follows (dollars in thousands):
		Three months ended September 30,
		2013				2012
Balance, beginning of period		$	7,903			$	11,011
Charge-offs		—				(526		)
Provision (release)		(234		)		2,848
Balance, end of period		$	7,669			$	13,333
		Nine months ended September 30,
		2013				2012
Balance, beginning of period		$	11,580			$	11,793
Charge-offs		(2,148		)		(4,595		)
Provision (release)		(1,763		)		6,135
Balance, end of period		$	7,669			$	13,333
Information regarding the portion of the Company’s mortgage loans that were impaired as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
		Unpaid				Recorded				Related				Carrying
		Principal				Investment				Allowance				Value
		Balance
September 30, 2013:
Impaired mortgage loans with no valuation allowance recorded		$	11,762			$	11,157			$	—			$	11,157
Impaired mortgage loans with valuation allowance recorded		21,536				21,467				4,691				16,776
Total impaired mortgage loans		$	33,298			$	32,624			$	4,691			$	27,933
December 31, 2012:
Impaired mortgage loans with no valuation allowance recorded		$	13,039			$	12,496			$	—			$	12,496
Impaired mortgage loans with valuation allowance recorded		27,527				27,460				6,980				20,480
Total impaired mortgage loans		$	40,566			$	39,956			$	6,980			$	32,976
The Company’s average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
		Three months ended September 30,
		2013								2012
		Average				Interest				Average				Interest
		Investment(1)				Income				Investment(1)				Income
Impaired mortgage loans with no valuation allowance recorded		$	13,631			$	349			$	11,054			$	109
		21,490				266				35,047				461
Impaired mortgage loans with valuation allowance recorded
Total		$	35,121			$	615			$	46,101			$	570
		Nine months ended September 30,
		2013								2012
		Average				Interest				Average				Interest
		Investment(1)				Income				Investment(1)				Income
Impaired mortgage loans with no valuation allowance recorded		$	13,504			$	533			$	16,312			$	305
		24,337				801				36,178				1,180
Impaired mortgage loans with valuation allowance recorded
Total		$	37,841			$	1,334			$	52,490			$	1,485
(1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.
The Company did not acquire any impaired mortgage loans during the nine months ended September 30, 2013 and 2012. The Company had $3.0 million and $16.9 million of mortgage loans, gross of valuation allowances, that were on nonaccrual status at September 30, 2013 and December 31, 2012, respectively.
Policy Loans
Policy loans comprised approximately 3.9% of the Company’s total investments as of both September 30, 2013 and December 31, 2012, substantially all of which are associated with one client. These policy loans present no credit risk because the amount of the loan cannot exceed the obligation due to the ceding company upon the death of the insured or surrender of the underlying policy. The provisions of the treaties in force and the underlying policies determine the policy loan interest rates. As policy loans represent premature distributions of policy liabilities, they have the effect of reducing future disintermediation risk. In addition, the Company earns a spread between the interest rate earned on policy loans and the interest rate credited to corresponding liabilities.
Funds Withheld at Interest
Funds withheld at interest comprised approximately 18.0% and 17.0% of the Company’s total investments as of September 30, 2013 and December 31, 2012, respectively. As of September 30, 2013 and December 31, 2012, approximately 70.0% and 69.7%, respectively, of the Company’s funds withheld at interest balance, net of embedded derivatives, was associated with one client. For reinsurance agreements written on a modified coinsurance basis and certain agreements written on a coinsurance funds withheld basis, assets equal to the net statutory reserves are withheld and legally owned and managed by the ceding company and are reflected as funds withheld at interest on the Company’s condensed consolidated balance sheets. In the event of a ceding company’s insolvency, the Company would need to assert a claim on the assets supporting its reserve liabilities. However, the risk of loss to the Company is mitigated by its ability to offset amounts it owes the ceding company for claims or allowances with amounts owed to the Company from the ceding company. The Company is subject to the investment performance on the withheld assets, although it does not directly control them. These assets are primarily fixed maturity investment securities and pose risks similar to the fixed maturity securities the Company owns. To mitigate this risk, the Company helps set the investment guidelines followed by the ceding company and monitors compliance.
Other Invested Assets
Other invested assets include equity securities, limited partnership interests, real estate joint ventures, structured loans, derivative contracts, Federal Home Loan Bank of Des Moines ("FHLB") common stock (included in other), investments supporting unit-linked variable annuity type liabilities, which do not qualify as separate account assets (included in other), and real estate held-for-investment (included in other). Other invested assets represented approximately 3.5% of the Company’s total investments as of both September 30, 2013 and December 31, 2012. Carrying values of these assets as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands):
		September 30, 2013				December 31, 2012
Equity securities		$	146,910			$	222,700
Limited partnerships and real estate joint ventures		417,761				356,419
Structured loans		245,404				306,497
Derivatives		87,421				168,208
Other		218,895				105,719
Total other invested assets		$	1,116,391			$	1,159,543
Investments Transferred to the Company
During the second quarter of 2012, the Company added a large fixed deferred annuity reinsurance transaction in its U.S. Asset-Intensive sub-segment. This transaction increased the Company’s invested asset base by approximately $5.4 billion which was reflected on the condensed consolidated balance sheet as of June 30, 2012 as an investment receivable. In satisfaction of this investment receivable, the Company received the following on July 31, 2012 and August 3, 2012 (dollars in thousands):
				Amortized Cost/				Estimated
				Recorded Investment				Fair Value
Fixed maturity securities - available for sale:
	Corporate securities			$	2,585,095			$	2,606,816
	Asset-backed securities			137,251				138,918
	Commercial mortgage-backed securities			703,313				704,065
	U.S. Government and agencies securities			240,952				256,168
	State and political subdivision securities			27,297				27,555
	Other foreign government, supranational, and
		foreign government-sponsored enterprises		56,776				55,437
			Total fixed maturity securities - available for sale	3,750,684				3,788,959
Mortgage loans on real estate				1,009,454				1,021,661
Short-term investments				101,428				101,338
Cash and cash equivalents				501,593				501,593
Accrued interest				43,739				43,739
			Total	$	5,406,898			$	5,457,290

Derivative_Instruments

Derivative Instruments	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Derivative Instruments	'
	Derivative Instruments
	Derivatives, except embedded derivatives, are carried on the Company’s condensed consolidated balance sheets in other invested assets or other liabilities, at fair value. Embedded derivative liabilities on modified coinsurance or funds withheld arrangements are included on the condensed consolidated balance sheets with the host contract in funds withheld at interest, at fair value. Embedded derivative liabilities on indexed annuity and variable annuity products are included on the condensed consolidated balance sheets with the host contract in interest-sensitive contract liabilities, at fair value. Embedded derivative assets are included on the condensed consolidated balance sheets in reinsurance ceded receivables. The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of September 30, 2013 and December 31, 2012 (dollars in thousands):
			30-Sep-13											31-Dec-12
			Notional				Carrying Value/Fair Value							Notional				Carrying Value/Fair Value
			Amount				Assets				Liabilities			Amount				Assets				Liabilities
	Derivatives not designated as hedging instruments:
	Interest rate swaps		$	1,510,467			$	45,280			$	15,694		$	2,195,059			$	123,085			$	17,867
	Interest rate options		240,000				5,699				—			—				—				—
	Financial futures		84,192				—				—			127,877				—				—
	Foreign currency forwards		79,618				—				8,928			74,400				1,017				2,105
	Consumer price index swaps		76,306				131				19			85,135				1,446				—
	Credit default swaps		689,700				5,744				3,810			714,000				2,228				5,922
	Equity options		704,402				43,621				—			696,776				62,514				—
	Synthetic guaranteed investment contracts		3,978,244				—				—			2,018,073				—				—
	Embedded derivatives in:
	Modified coinsurance or funds withheld arrangements		—				—				175,933			—				—				243,177
	Indexed annuity products		—				—				760,746			—				—				740,256
	Variable annuity products		—				—				65,153			—				—				172,105
	Total non-hedging derivatives		7,362,929				100,475				1,030,283			5,911,320				190,290				1,181,432
	Derivatives designated as hedging instruments:
	Interest rate swaps		51,335				—				2,770			57,275				344				786
	Foreign currency swaps		780,274				9,344				4,325			629,512				—				27,398
	Total hedging derivatives		831,609				9,344				7,095			686,787				344				28,184
	Total derivatives		$	8,194,538			$	109,819			$	1,037,378		$	6,598,107			$	190,634			$	1,209,616
	Netting Arrangements
	Certain of the Company’s derivatives are subject to enforceable master netting arrangements and reported as a net asset or liability in the condensed consolidated balance sheets. The Company nets all derivatives that are subject to such arrangements.
	The Company has elected to include all derivatives, except embedded derivatives, in the tables below, irrespective of whether they are subject to an enforceable master netting arrangement or a similar agreement. See Note 4 – "Investments" for information regarding the Company’s securities borrowing and repurchase/reverse repurchase programs. See “Embedded Derivatives” below for information regarding the Company’s bifurcated embedded derivatives.
	The following table provides information relating to the Company’s derivative instruments as of September 30, 2013 and December 31, 2012 (dollars in thousands):
														Gross Amounts Not
														Offset in the Balance Sheet
			Gross Amounts				Gross Amounts				Net Amounts			Financial				Cash Collateral				Net Amount
			Recognized				Offset in the				Presented in the			Instruments				Pledged/
							Balance Sheet				Balance Sheet							Received
	September 30, 2013:
	Derivative assets		$	109,819			$	(22,398	)		$	87,421		$	(10,624	)		$	(64,027	)		$	12,770
	Derivative liabilities		35,546				(22,398		)		13,148			(15,238		)		(8,150		)		(10,240		)
	December 31, 2012:
	Derivative assets		$	190,634			$	(22,426	)		$	168,208		$	(22,458	)		$	(136,414	)		$	9,336
	Derivative liabilities		54,078				(22,426		)		31,652			(1,565		)		(27,867		)		2,220
	Accounting for Derivative Instruments and Hedging Activities
	The Company does not enter into derivative instruments for speculative purposes. As discussed below under “Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging,” the Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. As of September 30, 2013 and December 31, 2012, the Company held interest rate swaps that were designated and qualified as cash flow hedges of interest rate risk, held foreign currency swaps that were designated and qualified as hedges of a portion of its net investment in its foreign operations and had derivative instruments that were not designated as hedging instruments. See Note 2 – “Summary of Significant Accounting Policies” of the Company’s 2012 Annual Report for a detailed discussion of the accounting treatment for derivative instruments, including embedded derivatives. Derivative instruments are carried at fair value and generally require an insignificant amount of cash at inception of the contracts.
	Cash Flow Hedges
	The Company designates and accounts for certain interest rate swaps, in which the cash flows are denominated in different currencies, commonly referred to as cross-currency swaps, as cash flow hedges when they meet the requirements of the general accounting principles for Derivatives and Hedging.
	The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
			Three months ended September 30,
			2013				2012
	Accumulated other comprehensive income (loss), balance beginning of period		$	(5,037	)		$	(719	)
	Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		2,583				(2,831		)
	Amounts reclassified to investment income		(291		)		(351		)
	Accumulated other comprehensive income (loss), balance end of period		$	(2,745	)		$	(3,901	)
			Nine months ended September 30,
			2013				2012
	Accumulated other comprehensive income (loss), balance beginning of period		$	403			$	(828	)
	Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		(2,352		)		(2,044		)
	Amounts reclassified to investment income		(796		)		(1,029		)
	Accumulated other comprehensive income (loss), balance end of period		$	(2,745	)		$	(3,901	)
	As of September 30, 2013, the before-tax deferred net gains on derivative instruments recorded in AOCI that are expected to be reclassified to earnings during the next twelve months are $0.6 million. This expectation is based on the anticipated interest payments on hedged investments in fixed maturity securities that will occur over the next twelve months, at which time the Company will recognize the deferred net gains (losses) as an adjustment to investment income over the term of the investment cash flows. There were no hedged forecasted transactions, other than the receipt or payment of variable interest payments on existing financial instruments, for the three and nine months ended September 30, 2013 and 2012.
	The following table presents the effects of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and AOCI for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
	Derivatives in Cash Flow		Amount of Gains				Amount and Location of Gains (Losses)							Amount and Location of Gains (Losses)
	Hedging Relationships		(Losses) Deferred in				Reclassified from AOCI into Income (Loss)							Recognized in Income (Loss) on Derivatives
			AOCI on Derivatives
			(Effective Portion)				(Effective Portion)							(Ineffective Portion and Amounts Excluded
														from Effectiveness Testing)
						Investment Related				Investment Income			Investment Related				Investment Income
						Gains (Losses)							Gains (Losses)
For the three months ended September 30, 2013:
Interest rate swaps		$	2,583			$	—			$	291		$	(3	)		$	—
For the three months ended September 30, 2012:
Interest rate swaps		$	(2,831	)		$	—			$	351		$	(3	)		$	—
For the nine months ended September 30, 2013:
Interest rate swaps		$	(2,352	)		$	—			$	796		$	11			$	—
For the nine months ended September 30, 2012:
Interest rate swaps		$	(2,044	)		$	—			$	1,029		$	—			$	—
Hedges of Net Investments in Foreign Operations
The Company uses foreign currency swaps to hedge a portion of its net investment in certain foreign operations against adverse movements in exchange rates. The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
		Derivative Gains (Losses) Deferred in AOCI
		For the three months ended September 30,								For the nine months ended September 30,
Type of NIFO Hedge (1) (2)		2013				2012				2013			2012
Foreign currency swaps		$	(14,600	)		$	(19,454	)		$	20,235		$	(23,457	)
-1	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
-2	There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
The cumulative foreign currency translation gain (loss) recorded in AOCI related to these hedges was $3.8 million and $(16.4) million at September 30, 2013 and December 31, 2012, respectively. If a foreign operation was sold or substantially liquidated, the amounts in AOCI would be reclassified to the condensed consolidated statements of income. A pro rata portion would be reclassified upon partial sale of a foreign operation.
Non-qualifying Derivatives and Derivatives for Purposes Other Than Hedging
The Company uses various derivative instruments for risk management purposes that either do not qualify or have not been qualified for hedge accounting treatment, including derivatives used to economically hedge changes in the fair value of liabilities associated with the reinsurance of variable annuities with guaranteed living benefits. The gain or loss related to the change in fair value for these derivative instruments is recognized in investment related gains (losses), in the condensed consolidated statements of income, except where otherwise noted. The Company recognized investment related losses of $24.5 million and $20.6 million, for the three months, and $137.2 million and $31.8 million for the nine months ended September 30, 2013 and 2012, respectively, related to derivatives (not including embedded derivatives) that do not qualify or have not been qualified for hedge accounting.
A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s income statement for the three and nine months ended September 30, 2013 and 2012 is as follows (dollars in thousands):
				Gain (Loss) for the three months ended
				September 30,
Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013				2012
Interest rate swaps		Investment related gains (losses), net		$	(8,221	)		$	(1,437	)
Interest rate options		Investment related gains (losses), net		(2,374		)		—
Financial futures		Investment related gains (losses), net		(1,140		)		(3,977		)
Foreign currency forwards		Investment related gains (losses), net		629				519
CPI swaps		Investment related gains (losses), net		(39		)		422
Credit default swaps		Investment related gains (losses), net		10,807				7,817
Equity options		Investment related gains (losses), net		(24,113		)		(23,916		)
Embedded derivatives in:
Modco or funds withheld arrangements		Investment related gains (losses), net		(67,461		)		54,836
Indexed annuity products		Policy acquisition costs and other insurance expenses		—				(224		)
Indexed annuity products		Interest credited		28,379				(33,597		)
Variable annuity products		Investment related gains (losses), net		19,829				2,579
Total non-hedging derivatives				$	(43,704	)		$	3,022
				Gain (Loss) for the nine months ended
				September 30,
Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013				2012
Interest rate swaps		Investment related gains (losses), net		$	(68,900	)		$	24,553
Interest rate options		Investment related gains (losses), net		(8,373		)		—
Financial futures		Investment related gains (losses), net		(7,306		)		(10,312		)
Foreign currency forwards		Investment related gains (losses), net		(7,988		)		(574		)
CPI swaps		Investment related gains (losses), net		(2,027		)		(1,811		)
Credit default swaps		Investment related gains (losses), net		17,138				14,835
Equity options		Investment related gains (losses), net		(59,784		)		(58,532		)
Embedded derivatives in:
Modco or funds withheld arrangements		Investment related gains (losses), net		70,514				40,955
Indexed annuity products		Policy acquisition costs and other insurance expenses		—				(363		)
Indexed annuity products		Interest credited		(32,637		)		(26,059		)
Variable annuity products		Investment related gains (losses), net		106,952				74,025
Total non-hedging derivatives				$	7,589			$	56,717
Types of Derivatives Used by the Company
Interest Rate Swaps
Interest rate swaps are used by the Company primarily to reduce market risks from changes in interest rates and to alter interest rate exposure arising from mismatches between assets and liabilities (duration mismatches). With an interest rate swap, the Company agrees with another party to exchange, at specified intervals, the difference between two rates, which can be either fixed-rate or floating-rate interest amounts, tied to an agreed-upon notional principal amount. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments at each due date.
Interest Rate Options
Interest rate options, commonly referred to as swaptions, are used by the Company primarily to hedge living benefit guarantees embedded in certain variable annuity products. A swaption, used to hedge against adverse changes in interest rates, is an option to enter into a swap with a forward starting effective date. The Company pays an upfront premium for the right to exercise this option in the future.
Financial Futures
Exchange-traded futures are used primarily to economically hedge liabilities embedded in certain variable annuity products. With exchange-traded futures transactions, the Company agrees to purchase or sell a specified number of contracts, the value of which is determined by the relevant indices, and to post variation margin on a daily basis in an amount equal to the difference between the daily estimated fair values of those contracts. The Company enters into exchange-traded futures with regulated futures commission merchants that are members of the exchange.
Equity Options
Equity index options are used by the Company primarily to hedge minimum guarantees embedded in certain variable annuity products. To hedge against adverse changes in equity indices volatility, the Company buys put options. The contracts are net settled in cash based on differentials in the indices at the time of exercise and the strike price.
Consumer Price Index Swaps
Consumer price index (“CPI”) swaps are used by the Company primarily to economically hedge liabilities embedded in certain insurance products where value is directly affected by changes in a designated benchmark consumer price index. With a CPI swap transaction, the Company agrees with another party to exchange the actual amount of inflation realized over a specified period of time for a fixed amount of inflation determined at inception. These transactions are executed pursuant to master agreements that provide for a single net payment or individual gross payments to be made by the counterparty at each due date. Most of these swaps will require a single payment to be made by one counterparty at the maturity date of the swap.
Foreign Currency Swaps
Foreign currency swaps are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency swap transaction, the Company agrees with another party to exchange, at specified intervals, the difference between one currency and another at a forward exchange rate calculated by reference to an agreed upon principal amount. The principal amount of each currency is exchanged at the termination of the currency swap by each party.
Foreign Currency Forwards
Foreign currency forwards are used by the Company to reduce the risk from fluctuations in foreign currency exchange rates associated with its assets and liabilities denominated in foreign currencies. With a foreign currency forward transaction, the Company agrees with another party to deliver a specified amount of an identified currency at a specified future date. The price is agreed upon at the time of the contract and payment for such a contract is made in a different currency at the specified future date.
Credit Default Swaps
The Company sells protection under single name credit default swaps and credit default swap index tranches to diversify its credit risk exposure in certain portfolios and, in combination with purchasing securities, to replicate characteristics of similar investments based on the credit quality and term of the credit default swap. Credit default triggers for indexed reference entities and single name reference entities are defined in the contracts. The Company’s maximum exposure to credit loss equals the notional value for credit default swaps. In the event of default for credit default swaps, the Company is typically required to pay the protection holder the full notional value less a recovery rate determined at auction.
The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at September 30, 2013 and December 31, 2012 (dollars in thousands):
		30-Sep-13										31-Dec-12
Rating Agency Designation of Referenced Credit Obligations(1)		Estimated Fair				Maximum				Weighted		Estimated Fair				Maximum				Weighted
		Value of Credit				Amount of Future				Average		Value of Credit				Amount of Future				Average
		Default Swaps				Payments under				Years to		Default Swaps				Payments under				Years to
						Credit Default				Maturity(3)						Credit Default				Maturity(3)
						Swaps(2)										Swaps(2)
AAA/AA-/A+/A/A-
Single name credit default swaps		$	(80	)		$	112,500			5.2		$	(2,077	)		$	124,500			5.9
Credit default swaps referencing indices		—				—				—		—				—				—
Subtotal		(80		)		112,500				5.2		(2,077		)		124,500				5.9
BBB+/BBB/BBB-
Single name credit default swaps		(1,734		)		144,200				5		(2,345		)		135,500				5.5
Credit default swaps referencing indices		3,936				415,000				4.2		937				430,000				5
Subtotal		2,202				559,200				4.4		(1,408		)		565,500				5.1
BB+
Single name credit default swaps		—				—				—		(222		)		6,000				4.5
Credit default swaps referencing indices		—				—				—		—				—				—
Subtotal		—				—				—		(222		)		6,000				4.5
Total		$	2,122			$	671,700			4.6		$	(3,707	)		$	696,000			5.2
-1	The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
-2	Assumes the value of the referenced credit obligations is zero.
-3	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.
The Company also purchases credit default swaps to reduce its risk against a drop in bond prices due to credit concerns of certain bond issuers. If a credit event, as defined by the contract, occurs, the Company is able to put the bond back to the counterparty at par.
Synthetic Guaranteed Investment Contracts
The Company sells fee-based synthetic guaranteed investment contracts which include investment-only, stable value contracts, to retirement plans. The assets are owned by the trustees of such plans, who invest the assets under the terms of investment guidelines agreed to with the Company. The contracts contain a guarantee of a minimum rate of return on participant balances supported by the underlying assets, and a guarantee of liquidity to meet certain participant-initiated plan cash flow requirements. These contracts are accounted for as derivatives, recorded at fair value and classified as interest rate derivatives.
Embedded Derivatives
The Company has certain embedded derivatives which are required to be separated from their host contracts and reported as derivatives. Host contracts include reinsurance treaties structured on a modified coinsurance (“modco”) or funds withheld basis. Changes in fair values of embedded derivatives on modco or funds withheld treaties are net of an increase (decrease) in investment related gains (losses), net of $1.0 million and $(6.2) million for the three months, and $(1.0) million and $(63.4) million for the nine months ended September 30, 2013 and 2012, respectively, associated with the Company’s own credit risk. Changes in fair values of embedded derivatives on variable annuity contracts are net of an increase (decrease) in investment related gains (losses), net of $(3.7) million and $(28.3) million for the three months, and $(8.6) million and $23.2 million for the nine months ended September 30, 2013 and 2012, respectively, associated with the Company’s own credit risk. Additionally, the Company reinsures equity-indexed annuity and variable annuity contracts with benefits that are considered embedded derivatives, including guaranteed minimum withdrawal benefits, guaranteed minimum accumulation benefits, and guaranteed minimum income benefits. The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three and nine months ended September 30, 2013 and 2012 are reflected in the following table (dollars in thousands):
	Three months ended September 30,								Nine months ended September 30,
	2013				2012				2013			2012
Embedded derivatives in modco or funds withheld arrangements included in investment related gains	$	(67,461	)		$	54,836			$	70,514		$	40,955
After the associated amortization of DAC and taxes, the related amounts included in net income	(15,693		)		11,228				19,842			10,563
Embedded derivatives in variable annuity contracts included in investment related gains	19,829				2,579				106,952			74,025
After the associated amortization of DAC and taxes, the related amounts included in net income	11,052				1,588				52,326			494
Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses	28,379				(33,821		)		(32,637		)	(26,422		)
After the associated amortization of DAC and taxes, the related amounts included in net income	6,622				(22,529		)		(53,772		)	6,465
Credit Risk
The Company manages its credit risk related to over-the-counter ("OTC") derivatives by entering into transactions with creditworthy counterparties, maintaining collateral arrangements and through the use of master netting agreements that provide for a single net payment to be made by one counterparty to another at each due date and upon termination.
The credit exposure of the Company's OTC derivative transactions is represented by the contracts with a positive fair value (market value) at the reporting date. To reduce credit exposures, the Company seeks to (i) enter into OTC derivative transactions pursuant to master netting agreements that provide for a netting of payments and receipts with a single counterparty, and (ii) enter into agreements that allow the use of credit support annexes, which are bilateral rating-sensitive agreements that require collateral postings at established threshold levels. Certain of the Company's OTC derivatives are cleared derivatives, which are bilateral transactions between the Company and a counterparty where the transactions are cleared through a clearinghouse, such that each derivative counterparty is only exposed to the default of the clearinghouse. These cleared transactions require initial and daily variation margin collateral postings and include certain interest rate swaps and credit default swaps entered into on or after June 10, 2013, related to new guidelines implemented under the Dodd-Frank Wall Street Reform and Consumer Protection Act. Also, the Company enters into exchange-traded futures through regulated exchanges and these transactions are settled on a daily basis, thereby reducing credit risk exposure in the event of non-performance by counterparties to such financial instruments.
The Company enters into various collateral arrangements, which require both the posting and accepting of collateral in connection with its derivative instruments. Collateral agreements contain attachment thresholds that may vary depending on the posting party’s ratings. Additionally, a decline in the Company’s or the counterparty’s credit ratings to specified levels could result in potential settlement of the derivative positions under the Company’s agreements with its counterparties. The Company also has exchange-traded futures, which require the maintenance of a margin account. As exchange-traded futures are affected through regulated exchanges, and positions are marked to market on a daily basis, the Company has minimal exposure to credit-related losses in the event of nonperformance by counterparties.
The Company’s credit exposure related to derivative contracts is generally limited to the fair value at the reporting date plus or minus any collateral posted or held by the Company. Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts and margin account for exchange-traded futures at September 30, 2013 and December 31, 2012 are reflected in the following table (dollars in thousands):
		30-Sep-13				31-Dec-12
Estimated fair value of derivatives in net asset position		$	74,273			$	136,558
Cash provided as collateral(1)		8,150				27,867
Securities pledged to counterparties as collateral(2)		15,238				1,565
Cash pledged from counterparties as collateral(3)		(64,027		)		(136,414		)
Securities pledged from counterparties as collateral(4)		(10,624		)		(22,458		)
Initial margin for cleared derivatives		(10,869		)		—
Net credit exposure		$	12,141			$	7,118
Margin account related to exchange-traded futures(5)		$	3,833			$	5,605
-1	Consists of receivable from counterparty, included in other assets.
-2	Included in other invested assets, primarily consists of U.S. Treasury securities.
-3	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
-4	Consists of U.S. Treasury securities.
-5	Included in cash and cash equivalents.

Fair_Value_of_Assets_and_Liabi

Fair Value of Assets and Liabilities	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Fair Value Disclosures	'
	Fair Value of Assets and Liabilities
	Fair Value Measurement
	General accounting principles for Fair Value Measurements and Disclosures define fair value as the exchange price that would be received for an asset or paid to transfer a liability (an exit price) in the principal or most advantageous market for the asset or liability in an orderly transaction between market participants on the measurement date. These principles also establish a fair value hierarchy which requires an entity to maximize the use of observable inputs and minimize the use of unobservable inputs when measuring fair value and describes three levels of inputs that may be used to measure fair value:
	Level 1 - Unadjusted quoted prices in active markets for identical assets or liabilities. Active markets are defined as having the following characteristics for the measured asset/liability: (i) many transactions, (ii) current prices, (iii) price quotes not varying substantially among market makers, (iv) narrow bid/ask spreads and (v) most information publicly available. The Company’s Level 1 assets and liabilities include investment securities that are traded in exchange markets.
	Level 2 - Observable inputs other than Level 1 prices such as quoted prices for similar assets or liabilities; quoted prices in markets that are not active; or market standard valuation techniques and assumptions with significant inputs that are observable or can be corroborated by observable market data for substantially the full term of the assets or liabilities. Such observable inputs include benchmarking prices for similar assets in active, liquid markets, quoted prices in markets that are not active and observable yields and spreads in the market. The Company’s Level 2 assets and liabilities include investment securities with quoted prices that are traded less frequently than exchange-traded instruments and derivative contracts whose values are determined using market standard valuation techniques. This category primarily includes corporate securities, Canadian and Canadian provincial government securities, and residential and commercial mortgage-backed securities, among others. Level 2 valuations are generally obtained from third party pricing services for identical or comparable assets or liabilities or through the use of valuation methodologies using observable market inputs. Prices from services are validated through analytical reviews and assessment of current market activity.
	Level 3 - Unobservable inputs that are supported by little or no market activity and that are significant to the fair value of the related assets or liabilities. Level 3 assets and liabilities include financial instruments whose value is determined using market standard valuation techniques described above. When observable inputs are not available, the market standard techniques for determining the estimated fair value of certain securities that trade infrequently, and therefore have little transparency, rely on inputs that are significant to the estimated fair value and that are not observable in the market or cannot be derived principally from or corroborated by observable market data. These unobservable inputs can be based in large part on management judgment or estimation and cannot be supported by reference to market activity. Even though unobservable, management believes these inputs are based on assumptions deemed appropriate given the circumstances and consistent with what other market participants would use when pricing similar assets and liabilities. For the Company’s invested assets, this category generally includes corporate securities (primarily private placements and bank loans), asset-backed securities (including those with exposure to subprime mortgages), and to a lesser extent, certain residential and commercial mortgage-backed securities, among others. Prices are determined using valuation methodologies such as discounted cash flow models and other similar techniques. Non-binding broker quotes, which are utilized when pricing service information is not available, are reviewed for reasonableness based on the Company’s understanding of the market, and are generally considered Level 3. Under certain circumstances, based on its observations of transactions in active markets, the Company may conclude the prices received from independent third party pricing services or brokers are not reasonable or reflective of market activity. In those instances, the Company would apply internally developed valuation techniques to the related assets or liabilities. Additionally, the Company’s embedded derivatives, all of which are associated with reinsurance treaties, are classified in Level 3 since their values include significant unobservable inputs.
	When inputs used to measure fair value fall within different levels of the hierarchy, the level within which the fair value measurement is categorized is based on the lowest level input that is significant to the fair value measurement in its entirety. For example, a Level 3 fair value measurement may include inputs that are observable (Levels 1 and 2) and unobservable (Level 3). Therefore, gains and losses for such assets and liabilities categorized within Level 3 may include changes in fair value that are attributable to both observable inputs (Levels 1 and 2) and unobservable inputs (Level 3).
	Assets and Liabilities by Hierarchy Level
	Assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 are summarized below (dollars in thousands):
	September 30, 2013:						Fair Value Measurements Using:
			Total				Level 1				Level 2			Level 3
	Assets:
	Fixed maturity securities – available-for-sale:
	Corporate securities		$	11,934,562			$	58,111			$	10,356,155		$	1,520,296
	Canadian and Canadian provincial governments		3,491,156				—				3,491,156			—
	Residential mortgage-backed securities		951,838				—				818,567			133,271
	Asset-backed securities		885,278				—				457,198			428,080
	Commercial mortgage-backed securities		1,453,114				—				1,328,173			124,941
	U.S. government and agencies securities		430,847				362,269				65,156			3,422
	State and political subdivision securities		297,729				—				253,688			44,041
	Other foreign government supranational and foreign government-sponsored enterprises		1,844,584				302,997				1,514,427			27,160
	Total fixed maturity securities – available-for-sale		21,289,108				723,377				18,284,520			2,281,211
	Funds withheld at interest – embedded derivatives		(175,933		)		—				—			(175,933		)
	Cash equivalents		671,999				671,999				—			—
	Short-term investments		19,436				12,761				6,675			—
	Other invested assets:
	Non-redeemable preferred stock		82,839				75,279				2,735			4,825
	Other equity securities		64,071				64,071				—			—
	Derivatives:
	Interest rate swaps		29,102				—				29,102			—
	Interest rate options		5,699				—				5,699			—
	Foreign currency forwards		—				—				—			—
	CPI swaps		112				—				112			—
	Credit default swaps		1,764				—				1,764			—
	Equity options		43,482				—				43,482			—
	Foreign currency swaps		7,262				—				7,262			—
	Other		15,514				15,514				—			—
	Total other invested assets		249,845				154,864				90,156			4,825
	Total		$	22,054,455			$	1,563,001			$	18,381,351		$	2,110,103
	Liabilities:
	Interest sensitive contract liabilities – embedded derivatives		$	825,899			$	—			$	—		$	825,899
	Other liabilities:
	Derivatives:
	Interest rate swaps		2,286				—				2,286			—
	Foreign currency forwards		8,928				—				8,928			—
	Credit default swaps		(170		)		—				(170		)	—
	Equity options		(139		)		—				(139		)	—
	Foreign currency swaps		2,243				—				2,243			—
	Total		$	839,047			$	—			$	13,148		$	825,899
	December 31, 2012:						Fair Value Measurements Using:
			Total				Level 1				Level 2			Level 3
	Assets:
	Fixed maturity securities – available-for-sale:
	Corporate securities		$	12,380,071			$	43,544			$	10,667,964		$	1,668,563
	Canadian and Canadian provincial governments		4,049,334				—				4,049,334			—
	Residential mortgage-backed securities		1,042,064				—				948,133			93,931
	Asset-backed securities		691,555				—				459,164			232,391
	Commercial mortgage-backed securities		1,698,903				—				1,531,897			167,006
	U.S. government and agencies securities		265,190				192,780				67,872			4,538
	State and political subdivision securities		302,498				—				259,286			43,212
	Other foreign government, supranational and foreign government-sponsored enterprises		1,861,999				297,025				1,536,694			28,280
	Total fixed maturity securities – available-for-sale		22,291,614				533,349				19,520,344			2,237,921
	Funds withheld at interest – embedded derivatives		(243,177		)		—				—			(243,177		)
Cash equivalents		575,864				575,864				—			—
Short-term investments		239,131				178,923				38,177			22,031
Other invested assets:
Non-redeemable preferred stock		74,841				64,268				10,573			—
Other equity securities		147,859				147,859				—			—
Derivatives:
Interest rate swaps		104,972				—				104,972			—
Foreign currency forwards		1,017				—				1,017			—
CPI swaps		1,446				—				1,446			—
Credit default swaps		(1,741		)		—				(1,741		)	—
Equity options		62,514				—				62,514			—
Collateral		17,002				1,323				15,679			—
Other		11,951				11,951				—			—
Total other invested assets		419,861				225,401				194,460			—
Total		$	23,283,293			$	1,513,537			$	19,752,981		$	2,016,775
Liabilities:
Interest sensitive contract liabilities – embedded derivatives		$	912,361			$	—			$	—		$	912,361
Other liabilities:
Derivatives:
Interest rate swaps		196				—				196			—
Foreign currency forwards		2,105				—				2,105			—
Credit default swaps		1,953				—				1,953			—
Foreign currency swaps		27,398				—				27,398			—
Total		$	944,013			$	—			$	31,652		$	912,361
The Company may utilize information from third parties, such as pricing services and brokers, to assist in determining the fair value for certain assets and liabilities; however, management is ultimately responsible for all fair values presented in the Company’s condensed consolidated financial statements. This includes responsibility for monitoring the fair value process, ensuring objective and reliable valuation practices and pricing of financial instruments, and approving changes to valuation methodologies and pricing sources. The selection of the valuation technique(s) to apply considers the definition of an exit price and the nature of the asset or liability being valued and significant expertise and judgment is required.
The Company performs initial and ongoing analysis and review of the various techniques utilized in determining fair value to ensure that the valuation approaches utilized are appropriate and consistently applied, and that the various assumptions are reasonable. The Company also performs ongoing analysis and review of the information and prices received from third parties to ensure that the prices represent a reasonable estimate of the fair value and to monitor controls around pricing, which includes quantitative and qualitative analysis and is overseen by the Company’s investment and accounting personnel. Examples of procedures performed include, but are not limited to, review of pricing trends, comparison of a sample of executed prices of securities sold to the fair value estimates, comparison of fair value estimates to management’s knowledge of the current market, and ongoing confirmation that third party pricing services use, wherever possible, market-based parameters for valuation. In addition, the Company utilizes both internal and external cash flow models to analyze the reasonableness of fair values utilizing credit spread and other market assumptions, where appropriate. As a result of the analysis, if the Company determines there is a more appropriate fair value based upon the available market data, the price received from the third party is adjusted accordingly. The Company also determines if the inputs used in estimated fair values received from pricing services are observable by assessing whether these inputs can be corroborated by observable market data.
The fair value of embedded derivative liabilities, including those calculated by third parties, are monitored through the use of attribution reports to quantify the effect of underlying sources of fair value change, including capital market inputs based on policyholder account values, interest rates and short-term and long-term implied volatilities, from period to period. Actuarial assumptions are based on experience studies performed internally in combination with available industry information and are reviewed on a periodic basis, at least annually.
For assets and liabilities reported at fair value, the Company utilizes when available, fair values based on quoted prices in active markets that are regularly and readily obtainable. Generally, these are very liquid investments and the valuation does not require management judgment. When quoted prices in active markets are not available, fair value is based on market valuation techniques, market comparable pricing and the income approach. The use of different techniques, assumptions and inputs may have a material effect on the estimated fair values of the Company’s securities holdings. For the quarters ended September 30, 2013 and 2012, the application of market standard valuation techniques applied to similar assets and liabilities has been consistent.
The methods and assumptions the Company uses to estimate the fair value of assets and liabilities measured at fair value on a recurring basis are summarized below.
Fixed Maturity Securities – The fair values of the Company’s publicly-traded fixed maturity securities are generally based on prices obtained from independent pricing services. Prices from pricing services are sourced from multiple vendors, and a vendor hierarchy is maintained by asset type based on historical pricing experience and vendor expertise. The Company generally receives prices from multiple pricing services for each security, but ultimately uses the price from the pricing service highest in the vendor hierarchy based on the respective asset type. To validate reasonableness, prices are periodically reviewed as explained above. Consistent with the fair value hierarchy described above, securities with validated quotes from pricing services are generally reflected within Level 2, as they are primarily based on observable pricing for similar assets and/or other market observable inputs. If the pricing information received from third party pricing services is not reflective of market activity or other inputs observable in the market, the Company may challenge the price through a formal process with the pricing service.
If the Company ultimately concludes that pricing information received from the independent pricing service is not reflective of market activity, non-binding broker quotes are used, if available. If the Company concludes the values from both pricing services and brokers are not reflective of market activity, it may override the information from the pricing service or broker with an internally developed valuation; however, this occurs infrequently. Internally developed valuations or non-binding broker quotes are also used to determine fair value in circumstances where vendor pricing is not available. These estimates may use significant unobservable inputs, which reflect the Company’s assumptions about the inputs that market participants would use in pricing the asset. Circumstances where observable market data are not available may include events such as market illiquidity and credit events related to the security. Pricing service overrides, internally developed valuations and non-binding broker quotes are generally based on significant unobservable inputs and are reflected as Level 3 in the valuation hierarchy.
The inputs used in the valuation of corporate and government securities include, but are not limited to standard market observable inputs which are derived from, or corroborated by, market observable data including market yield curve, duration, call provisions, observable prices and spreads for similar publicly traded or privately traded issues that incorporate the credit quality and industry sector of the issuer. For structured securities, valuation is based primarily on matrix pricing or other similar techniques using standard market inputs including spreads for actively traded securities, spreads off benchmark yields, expected prepayment speeds and volumes, current and forecasted loss severity, rating, weighted average coupon, weighted average maturity, average delinquency rates, geographic region, debt-service coverage ratios and issuance-specific information including, but not limited to: collateral type, payment terms of the underlying assets, payment priority within the tranche, structure of the security, deal performance and vintage of loans.
When observable inputs are not available, the market standard valuation techniques for determining the estimated fair value of certain types of securities that trade infrequently, and therefore have little or no price transparency, rely on inputs that are significant to the estimated fair value that are not observable in the market or cannot be derived principally from or corroborated by observable market data. These unobservable inputs can be based in large part on management judgment or estimation, and cannot be supported by reference to market activity. Even though unobservable, these inputs are based on assumptions deemed appropriate given the circumstances and are believed to be consistent with what other market participants would use when pricing such securities.
The fair values of private placement securities are primarily determined using a discounted cash flow model. In certain cases these models primarily use observable inputs with a discount rate based upon the average of spread surveys collected from private market intermediaries who are active in both primary and secondary transactions, taking into account, among other factors, the credit quality and industry sector of the issuer and the reduced liquidity associated with private placements. Generally, these securities have been reflected within Level 3. For certain private fixed maturities, the discounted cash flow model may also incorporate significant unobservable inputs, which reflect the Company’s own assumptions about the inputs market participants would use in pricing the security. To the extent management determines that such unobservable inputs are not significant to the price of a security, a Level 2 classification is made. Otherwise, a Level 3 classification is used.
Embedded Derivatives – For embedded derivative liabilities associated with the underlying products in reinsurance treaties, primarily equity-indexed and variable annuity treaties, the Company utilizes a discounted cash flow model, which includes an estimate of future equity option purchases and an adjustment for the Company’s own credit risk. The variable annuity embedded derivative calculations are performed by third parties based on methodology and input assumptions provided by the Company. To validate the reasonableness of the resulting fair value, the Company’s internal actuaries perform reviews and analytical procedures on the results. The capital market inputs to the model, such as equity indexes, short-term equity volatility and interest rates, are generally observable. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description.
The fair value of embedded derivatives associated with funds withheld reinsurance treaties is determined based upon a total return swap technique with reference to the fair value of the investments held by the ceding company that support the Company’s funds withheld at interest asset with an adjustment for the Company’s own credit risk. The fair value of the underlying assets is generally based on market observable inputs using industry standard valuation techniques. The valuation also requires certain significant inputs, which are generally not observable and accordingly, the valuation is considered Level 3 in the fair value hierarchy, see “Level 3 Measurements and Transfers” below for a description.
Company’s Own Credit Risk – The Company uses a structural default risk model to estimate its own credit risk. The input assumptions are a combination of externally derived and published values (default threshold and uncertainty), market inputs (interest rate, Company equity price per share, Company debt per share, Company equity price volatility) and insurance industry data (Loss Given Default), adjusted for market recoverability.
Cash Equivalents and Short-Term Investments – Cash equivalents and short-term investments include money market instruments, commercial paper and other highly liquid debt instruments. Money market instruments are generally valued using unadjusted quoted prices in active markets that are accessible for identical assets and are primarily classified as Level 1. The fair value of certain other short-term investments, such as floating rate notes and bonds with original maturities less than twelve months, are based upon other market observable data and are typically classified as Level 2. However, certain short-term investments may incorporate significant unobservable inputs resulting in a Level 3 classification. Various time deposits carried as cash equivalents or short-term investments are not measured at estimated fair value and therefore are excluded from the tables presented.
Equity Securities – Equity securities consist principally of exchange-traded funds and preferred stock of publicly and privately traded companies. The fair values of publicly traded equity securities are primarily based on quoted market prices in active markets and are classified within Level 1 in the fair value hierarchy. The fair values of preferred equity securities, for which quoted market prices are not readily available, are based on prices obtained from independent pricing services and these securities are generally classified within Level 2 in the fair value hierarchy. Non-binding broker quotes for equity securities are generally based on significant unobservable inputs and are reflected as Level 3 in the fair value hierarchy.
Derivative Assets and Derivative Liabilities – All of the derivative instruments utilized by the Company are classified within Level 2 on the fair value hierarchy. These derivatives are principally valued using an income approach. Valuations of interest rate contracts are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, and repurchase rates. Valuations of foreign currency contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, LIBOR basis curves, currency spot rates, and cross currency basis curves. Valuations of credit contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, credit curves, and recovery rates. Valuations of equity market contracts, non-option-based, are based on present value techniques, which utilize significant inputs that may include the swap yield curve, spot equity index levels, and dividend yield curves. Valuations of equity market contracts, option-based, are based on option pricing models, which utilize significant inputs that may include the swap yield curve, spot equity index levels, dividend yield curves, and equity volatility. The Company does not currently have derivatives included in Level 3 measurement.
Level 3 Measurements and Transfers
As of September 30, 2013 and December 31, 2012, respectively, the Company classified approximately 10.7% and 10.0% of its fixed maturity securities in the Level 3 category. These securities primarily consist of private placement corporate securities and bank loans with inactive trading markets. Additionally, the Company has included asset-backed securities with subprime exposure and mortgage-backed securities with below investment grade ratings in the Level 3 category due to market uncertainty associated with these securities and the Company’s utilization of unobservable information from third parties for the valuation of these securities.
The significant unobservable inputs used in the fair value measurement of the Company’s corporate, sovereign, government-backed, other political subdivision and short-term investments are probability of default, liquidity premium and subordination premium. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumptions used for the liquidity premium and subordination premium. For securities with a fair value derived using the market comparable pricing valuation technique, liquidity premium is the only significant unobservable input.
The significant unobservable inputs used in the fair value measurement of the Company’s asset and mortgage-backed securities are prepayment rates, probability of default, liquidity premium and loss severity in the event of default. Significant increases (decreases) in any of those inputs in isolation would result in a significantly lower (higher) fair value measurement. Generally, a change in the assumption used for the probability of default is accompanied by a directionally similar change in the assumption used for the liquidity premium and loss severity and a directionally opposite change in the assumption used for prepayment rates.
The actuarial assumptions used in the fair value of embedded derivatives which include assumptions related to lapses, withdrawals, and mortality, are based on experience studies performed by the Company in combination with available industry information and are reviewed on a periodic basis, at least annually. The significant unobservable inputs used in the fair value measurement of embedded derivatives are assumptions associated with policyholder experience and selected capital market assumptions for equity-indexed and variable annuities. The selected capital market assumptions, which include long-term implied volatilities, are projections based on short-term historical information. Changes in interest rates, equity indices, equity volatility, the Company’s own credit risk, and actuarial assumptions regarding policyholder experience may result in significant fluctuations in the value of embedded derivatives.
Fair value measurements associated with funds withheld reinsurance treaties are generally not materially sensitive to changes in unobservable inputs associated with policyholder experience. The primary drivers of change in these fair values are related to movements of credit spreads, which are generally observable. Increases (decreases) in market credit spreads tend to decrease (increase) the fair value of embedded derivatives. Increases (decreases) in the own credit assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives.
Fair value measurements associated with variable annuity treaties are sensitive to both capital markets inputs and policyholder experience inputs. Increases (decreases) in lapse rates tend to decrease (increase) the value of the embedded derivatives associated with variable annuity treaties. Increases (decreases) in the long-term volatility assumption tend to increase (decrease) the fair value of embedded derivatives. Increases (decreases) in the own credit assumption tend to decrease (increase) the magnitude of the fair value of embedded derivatives.
The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements developed by the Company, which does not include unobservable Level 3 asset and liability measurements provided by third parties, as of September 30, 2013 and December 31, 2012 (dollars in thousands):
September 30, 2013:						Valuation Technique(s)		Unobservable Input		Range (Weighted Average)
		Fair Value
Assets:
State and political subdivision securities		$	5,032			Market comparable securities		Liquidity premium		1	%
Corporate securities		366,372				Market comparable securities		Liquidity premium		0-2% (1%)
Funds withheld at interest- embedded derivatives		(175,933		)		Total return swap		Mortality		0-100%  (1%)
								Lapse		0-35%  (6%)
								Withdrawal		0-5%  (3%)
								Own Credit		0-1%  (1%)
								Crediting rate		2-4%  (3%)
Liabilities:
Interest sensitive contract liabilities- embedded derivatives- indexed annuities		760,746				Discounted cash flow		Mortality		0-100%  (1%)
								Lapse		0-35%  (6%)
								Withdrawal		0-5%  (3%)
								Option budget projection		2-4%  (3%)
Interest sensitive contract liabilities- embedded derivatives- variable annuities		65,153				Discounted cash flow		Mortality		0-100% (2%)
								Lapse		0-25% (5%)
								Withdrawal		0-7% (3%)
								Own Credit		0-1% (1%)
								Long-term volatility		0-27% (13%)
	December 31, 2012:		Fair Value				Valuation Technique(s)		Unobservable Input		Range (Weighted Average)
	Assets:
	State and political subdivision securities		$	5,451			Market comparable securities		Liquidity premium		1	%
	Corporate securities		450,177				Market comparable securities		Liquidity premium		0-2% (1%)
	Short-term investments		22,031				Market comparable securities		Liquidity premium		1	%
	Funds withheld at interest- embedded derivatives		(243,177		)		Total return swap		Mortality		0-100% (1%)
									Lapse		0-35% (6%)
									Withdrawal		0-5% (3%)
									Own Credit		0-1% (1%)
									Crediting Rate		2-4% (3%)
	Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		740,256				Discounted cash flow		Mortality		0-100% (1%)
									Lapse		0-35% (6%)
									Withdrawal		0-5% (3%)
									Option budget projection		2-4% (3%)
	Interest sensitive contract liabilities- embedded derivatives- variable annuities		172,105				Discounted cash flow		Mortality		0-100% (2%)
									Lapse		0-25% (5%)
									Withdrawal		0-7% (3%)
									Own Credit		0-1% (1%)
									Long-term volatility		0-27% (14%)
The Company recognizes transfers of financial instruments into and out of levels within the fair value hierarchy at the beginning of the quarter in which the actual event or change in circumstances that caused the transfer occurs. Financial instruments transferred into Level 3 are due to a lack of observable market transactions and price information. Financial instruments are transferred out of Level 3 when circumstances change such that significant inputs can be corroborated with market observable data. This may be due to a significant increase in market activity for the financial instrument, a specific event, one or more significant input(s) becoming observable. Transfers out of Level 3 were primarily the result of the Company using observable pricing information or a third party pricing quotation that appropriately reflects the fair value of those financial instruments, without the need for adjustment based on the Company’s own assumptions regarding the characteristics of a specific financial instrument or the current liquidity in the market. In addition, certain transfers out of Level 3 were also due to increased observations of market transactions and price information for those financial instruments.
Transfers from Level 1 to Level 2 are due to the lack of observable market data when pricing these securities, while transfers from Level 2 to Level 1 are due to an increase in the availability of market observable data in an active market. The following tables present the transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
		Three months ended September 30,
		2013								2012
		Transfers from				Transfers from				Transfers from			Transfers from
		Level 1 to				Level 2 to				Level 1 to			Level 2 to
		Level 2				Level 1				Level 2			Level 1
Fixed maturity securities - available-for-sale:
Corporate securities		$	—			$	—			$	11,777		$	—
Other foreign government, supranational and foreign government-sponsored enterprises		—				—				2,163			—
Total fixed maturity securities		—				—				13,940			—
Non-redeemable preferred stock		—				—				9,646			11,068
Total		$	—			$	—			$	23,586		$	11,068
		Nine months ended September 30,
		2013								2012
		Transfers from				Transfers from				Transfers from			Transfers from
		Level 1 to				Level 2 to				Level 1 to			Level 2 to
		Level 2				Level 1				Level 2			Level 1
Fixed maturity securities - available-for-sale:
Corporate securities		$	—			$	14,012			$	14,773		$	4
U.S. government and agencies securities		—				—				—			11,152
State and political subdivision securities		—				—				12,794			—
Other foreign government, supranational and foreign government-sponsored enterprises		—				—				3,222			—
Total fixed maturity securities		—				14,012				30,789			11,156
Non-redeemable preferred stock		—				—				9,646			11,068
Total		$	—			$	14,012			$	40,435		$	22,224
The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2013, as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2013 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2013 (dollars in thousands):
For the three months ended September 30, 2013:		Fixed maturity securities - available-for-sale
		Corporate				Residential				Asset-backed			Commercial			U.S. Government
		securities				mortgage-				securities			mortgage-			and agencies
						backed							backed			securities
						securities							securities
Fair value, beginning of period		$	1,592,005			$	140,054			$	352,606		$	180,982		$	—
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(2,254		)		24				2,314			466			—
Investment related gains (losses), net		(924		)		(419		)		53			(6,864		)	—
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		587				122				370			8,998			(40		)
Purchases(1)		80,644				2,623				91,675			19,420			—
Sales(1)		(53,052		)		(1,116		)		(8,659		)	(81,253		)	—
Settlements(1)		(90,493		)		(8,017		)		(4,812		)	(233		)	—
Transfers into Level 3		2,760				—				—			3,425			3,462
Transfers out of Level 3		(8,977		)		—				(5,467		)	—			—
Fair value, end of period		$	1,520,296			$	133,271			$	428,080		$	124,941		$	3,422
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(2,096	)		$	24			$	2,314		$	301		$	—
Investment related gains (losses), net		—				—				—			(134		)	—
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—
For the three months ended September 30, 2013 (continued):		Fixed maturity securities
		available-for-sale
		State				Other foreign government, supranational and foreign government-sponsored enterprises				Funds withheld			Other invested assets- non-redeemable preferred stock			Interest sensitive contract liabilities embedded derivatives
		and political								at interest-
		subdivision								embedded
		securities								derivative
Fair value, beginning of period		$	41,275			$	26,830			$	(108,473	)	$	—		$	(878,568	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		9				(77		)		—			—			—
Investment related gains (losses), net		(4		)		—				(67,460		)	—			19,829
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			28,378
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		1,844				407				—			186			—
Purchases(1)		—				—				—			—			(16,082		)
Sales(1)		—				—				—			—			—
Settlements(1)		(62		)		—				—			—			20,544
Transfers into Level 3		979				—				—			4,639			—
Transfers out of Level 3		—				—				—			—			—
Fair value, end of period		$	44,041			$	27,160			$	(175,933	)	$	4,825		$	(825,899	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	9			$	(77	)		$	—		$	—		$	—
Investment related gains (losses), net		—				—				(67,460		)	—			19,326
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			7,834
Policy acquisition costs and other insurance expenses		—				—				—			—			—
For the nine months ended September 30, 2013:		Fixed maturity securities - available-for-sale
		Corporate				Residential				Asset-backed			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political subdivision securities
		securities				mortgage-backed				securities
						securities
Fair value, beginning of period		$	1,668,563			$	93,931			$	232,391		$	167,006		$	4,538		$	43,212
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(6,594		)		18				4,719			1,548			—			27
Investment related gains (losses), net		(1,837		)		(394		)		(1,468		)	(16,726		)	—			(12		)
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
Included in other comprehensive income		(36,123		)		(78		)		15,007			36,943			(40		)	204
Purchases(1)		256,006				54,543				220,098			19,420			—			—
Sales(1)		(109,123		)		(3,733		)		(24,951		)	(83,974		)	—			—
Settlements(1)		(236,392		)		(20,307		)		(16,248		)	(2,701		)	—			(369		)
Transfers into Level 3		10,906				14,631				8,305			3,425			3,462			979
Transfers out of Level 3		(25,110		)		(5,340		)		(9,773		)	—			(4,538		)	—
Fair value, end of period		$	1,520,296			$	133,271			$	428,080		$	124,941		$	3,422		$	44,041
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(6,313	)		$	17			$	4,711		$	1,382		$	—		$	27
Investment related gains (losses), net		(202		)		—				—			(10,243		)	—			—
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
For the nine months ended September 30, 2013 (continued):		Fixed maturity securities
		available-for-sale
		Other foreign				Funds withheld				Short-term			Other invested assets- non-redeemable preferred stock			Interest sensitive
		government,				at interest-				investments						contract liabilities
		supranational and				embedded										embedded
		foreign government-				derivative										derivatives
		sponsored enterprises
Fair value, beginning of period		$	28,280			$	(243,177	)		$	22,031		$	—		$	(912,361	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(227		)		—				(3		)	—			—
Investment related gains (losses), net		—				67,244				—			—			106,952
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			(32,637		)
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		(893		)		—				(28		)	186			—
Purchases(1)		—				—				—			—			(44,707		)
Sales(1)		—				—				—			—			—
Settlements(1)		—				—				(22,000		)	—			56,854
Transfers into Level 3		—				—				—			4,639			—
Transfers out of Level 3		—				—				—			—			—
Fair value, end of period		$	27,160			$	(175,933	)		$	—		$	4,825		$	(825,899	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(227	)		$	—			$	(4	)	$	—		$	—
Investment related gains (losses), net		—				67,244				—			—			104,237
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			(89,491		)
Policy acquisition costs and other insurance expenses		—				—				—			—			—
-1	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2012, as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2012 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2012 (dollars in thousands):
For the three months ended September 30, 2012:		Fixed maturity securities - available-for-sale
		Corporate				Residential mortgage-backed securities				Asset-backed securities			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political subdivision securities
		securities
Fair value, beginning of period		$	994,014			$	49,591			$	128,358		$	115,733		$	—		$	14,486
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(4,846		)		114				54			446			(59		)	1
Investment related gains (losses), net		(1,059		)		(187		)		(3		)	(2,088		)	—			(4		)
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
Included in other comprehensive income		22,280				479				7,658			6,188			(15		)	3,433
Purchases (1)		556,031				31,020				62,109			21,092			4,640			—
Sales(1)		(18,548		)		(24,566		)		(3,725		)	—			—			—
Settlements(1)		(31,448		)		(1,437		)		(4,407		)	(511		)	—			(116		)
Transfers into Level 3		1,293				1,804				5,006			26,208			—			29,150
Transfers out of Level 3		(10,444		)		(7,459		)		(5,460		)	—			—			—
Fair value, end of period		$	1,507,273			$	49,359			$	189,590		$	167,068		$	4,566		$	46,950
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(4,861	)		$	28			$	40		$	446		$	(59	)	$	1
Investment related gains (losses), net		(223		)		—				(242		)	(2,088		)	—			—
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
For the three months ended September 30, 2012 (continued):		Funds withheld				Short-term				Other invested			Reinsurance ceded  receivable-			Interest sensitive contract liabilities embedded derivatives
		at interest-				investments				assets- other			embedded derivatives
		embedded								equity securities
		derivatives
Fair value, beginning of period		$	(375,337	)		$	—			$	3,227		$	4,416		$	(938,927	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		—				(7		)		—			—			—
Investment related gains (losses), net		54,836				—				—			—			2,579
Claims & other policy benefits		—				—				—			—			213
Interest credited		—				—				—			—			(33,980		)
Policy acquisition costs and other insurance expenses		—				—				—			(124		)	—
Included in other comprehensive income		—				54				—			—			—
Purchases(1)		—				22,014				—			—			(8,502		)
Sales(1)		—				—				—			—			—
Settlements(1)		—				—				—			(100		)	24,813
Transfers into Level 3		—				—				—			—			—
Transfers out of Level 3		—				—				(3,227		)	—			—
Fair value, end of period		$	(320,501	)		$	22,061			$	—		$	4,192		$	(953,804	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	—			$	(7	)		$	—		$	—		$	—
Investment related gains (losses), net		54,836				—				—			—			427
Claims & other policy benefits		—				—				—			—			(23		)
Interest credited		—				—				—			—			(58,621		)
Policy acquisition costs and other insurance expenses		—				—				—			13			—
For the nine months ended September 30, 2012:		Fixed maturity securities - available-for-sale
		Corporate securities				Residential mortgage-backed securities				Asset-backed securities			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political
																			subdivision securities
Fair value, beginning of period		$	974,169			$	81,655			$	193,492		$	115,976		$	—		$	10,373
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(4,738		)		413				497			1,579			(59		)	5
Investment related gains (losses), net		(2,339		)		(223		)		(510		)	(13,771		)	—			(12		)
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
Included in other comprehensive income		31,940				1,886				16,135			17,436			(15		)	4,666
Purchases (1)		645,466				31,602				64,121			21,092			4,640			—
Sales(1)		(45,833		)		(40,790		)		(11,627		)	(1,552		)	—			—
Settlements(1)		(84,819		)		(5,139		)		(11,510		)	(568		)	—			(162		)
Transfers into Level 3		18,738				8,979				6,086			37,054			—			37,588
Transfers out of Level 3		(25,311		)		(29,024		)		(67,094		)	(10,178		)	—			(5,508		)
Fair value, end of period		$	1,507,273			$	49,359			$	189,590		$	167,068		$	4,566		$	46,950
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(4,747	)		$	283			$	440		$	1,579		$	(59	)	$	5
Investment related gains (losses), net		(1,329		)		(269		)		(849		)	(14,163		)	—			—
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
For the nine months ended September 30, 2012 (continued):		Funds withheld				Short-term				Other invested			Reinsurance ceded receivable-embedded derivatives			Interest sensitive contract liabilities embedded derivatives
		at interest-				investments				assets- other
		embedded								equity securities
		derivatives
Fair value, beginning of period		$	(361,456	)		$	—			$	11,489		$	4,945		$	(1,028,241	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		—				(7		)		—			—			—
Investment related gains (losses), net		40,955				—				1,098			—			74,025
Claims & other policy benefits		—				—				—			—			770
Interest credited		—				—				—			—			(27,348		)
Policy acquisition costs and other insurance expenses		—				—				—			(449		)	—
Included in other comprehensive income		—				54				843			—			—
Purchases(1)		—				22,014				108			—			(48,199		)
Sales(1)		—				—				(3,788		)	—			—
Settlements(1)		—				—				—			(304		)	75,189
Transfers into Level 3		—				—				—			—			—
Transfers out of Level 3		—				—				(9,750		)	—			—
Fair value, end of period		$	(320,501	)		$	22,061			$	—		$	4,192		$	(953,804	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	—			$	(7	)		$	—		$	—		$	—
Investment related gains (losses), net		40,955				—				(183		)	—			68,315
Claims & other policy benefits		—				—				—			—			56
Interest credited		—				—				—			—			(102,017		)
Policy acquisition costs and other insurance expenses		—				—				—			(33		)	—
-1	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
Nonrecurring Fair Value Measurements
The following table presents information for assets measured at estimated fair value on a nonrecurring basis during the periods presented; that is, they are not measured at fair value on a recurring basis but are subject to fair value adjustments only in certain circumstances (for example, when there is evidence of impairment). The estimated fair values for these assets were determined using significant unobservable inputs (Level 3).
		Three months ended September 30,
(dollars in thousands)		2013											2012
		Carrying Value				Estimated Fair				Net			Carrying Value			Estimated Fair			Net
		Prior to				Value After				Investment			Prior to Measurement			Value After			Investment
		Measurement				Measurement				Gains (Losses)						Measurement			Gains (Losses)
Mortgage loans(1)		$	13,528			$	13,575			$	47		$	25,092		$	23,467		$	(1,625	)
Limited partnership interests(2)		—				—				—			23,012			15,558			(7,454		)
		Nine months ended September 30,
		2013											2012
		Carrying Value				Estimated Fair				Net			Carrying Value			Estimated Fair			Net
		Prior to				Value After				Investment			Prior to			Value After			Investment
		Measurement				Measurement				Gains (Losses)			Measurement			Measurement			Gains (Losses)
Mortgage loans(1)		$	13,436			$	13,575			$	139		$	27,836		$	23,467		$	(4,369	)
Limited partnership interests(2)		11,590				9,161				(2,429		)	25,191			16,944			(8,247		)
Real estate(3)		4,736				4,136				(600		)	—			—			—
-1	Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows.
-2	Limited partnership interests — The impaired investments presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.
-3	Real estate investment - The impaired real estate investments presented above were written down to their estimated fair value at the date of impairment and are reported as losses above. The impairments were based on third-party appraisal values obtained and reviewed by the Company.
Fair Value of Financial Instruments
The Company is required by general accounting principles for Fair Value Measurements and Disclosures to disclose the fair value of certain financial instruments including those that are not carried at fair value. The following table presents the carrying amounts and estimated fair values of the Company’s financial instruments, which were not measured at fair value on a recurring basis, at September 30, 2013 and December 31, 2012 (dollars in thousands):
30-Sep-13		Carrying Value				Estimated				Fair Value Measurement Using:
						Fair Value				Level 1			Level 2			Level 3
Assets:
Mortgage loans on real estate		$	2,488,582			$	2,515,250			$	—		$	—		$	2,515,250
Policy loans		1,244,878				1,244,878				—			1,244,878			—
Funds withheld at interest(1)		5,917,002				6,144,891				—			—			6,144,891
Cash and cash equivalents(2)		751,236				751,236				751,236			—			—
Short-term investments(2)		24,756				24,756				24,756			—			—
Other invested assets(2)		652,759				694,909				4,956			31,436			658,517
Accrued investment income		262,330				262,330				—			262,330			—
Liabilities:
Interest-sensitive contract liabilities(1)		$	11,104,386			$	10,923,043			$	—		$	—		$	10,923,043
Long-term debt		2,214,170				2,348,049				—			—			2,348,049
Collateral finance facility		484,712				365,307				—			—			365,307
December 31, 2012:		Carrying Value				Estimated				Fair Value Measurement Using:
						Fair Value				Level 1			Level 2			Level 3
Assets:
Mortgage loans on real estate		$	2,300,587			$	2,426,688			$	—		$	—		$	2,426,688
Policy loans		1,278,175				1,278,175				—			1,278,175			—
Funds withheld at interest(1)		5,837,359				6,362,324				—			—			6,362,324
Cash and cash equivalents(2)		684,028				684,028				684,028			—			—
Short-term investments(2)		48,951				48,951				48,951			—			—
Other invested assets(2)		596,336				626,358				—			32,250			594,108
Accrued investment income		201,344				201,344				—			201,344			—
Liabilities:
Interest-sensitive contract liabilities(1)		$	11,566,962			$	11,926,339			$	—		$	—		$	11,926,339
Long-term debt		1,815,253				2,014,062				—			—			2,014,062
Collateral finance facility		652,010				456,050				—			—			456,050
-1	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
-2	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.
Mortgage Loans on Real Estate – The fair value of mortgage loans on real estate is estimated by discounting cash flows, both principal and interest, using current interest rates for mortgage loans with similar credit ratings and similar remaining maturities. As such, inputs include current treasury yields and spreads, which are based on the credit rating and average life of the loan, corresponding to the market spreads. The valuation of mortgage loans on real estate is considered Level 3 in the fair value hierarchy.
Policy Loans – Policy loans typically carry an interest rate that is adjusted annually based on an observable market index and therefore carrying value approximates fair value. The valuation of policy loans is considered Level 2 in the fair value hierarchy.
Funds Withheld at Interest – The carrying value of funds withheld at interest approximates fair value except where the funds withheld are specifically identified in the agreement. When funds withheld are specifically identified in the agreement, the fair value is based on the fair value of the underlying assets which are held by the ceding company. Ceding companies use a variety of sources and pricing methodologies, which are not transparent to the Company and may include significant unobservable inputs, to value the securities that are held in distinct portfolios, therefore the valuation of these funds withheld assets are considered Level 3 in the fair value hierarchy.
Cash and Cash Equivalents and Short-term Investments – The carrying values of cash and cash equivalents and short-term investments approximates fair values due to the short-term maturities of these instruments and are considered Level 1 in the fair value hierarchy.
Other Invested Assets – This primarily includes limited partnership interests accounted for using the cost method, structured loans, investments supporting unit-linked variable annuity type liabilities, FHLB common stock and cash collateral. The fair value of limited partnerships and other investments accounted for using the cost method is determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The valuation of these investments is considered Level 3 in the fair value hierarchy due to the limited activity and price transparency inherent in the market for such investments. The fair value of structured loans is estimated based on a discounted cash flow analysis using discount rates applicable to each structured loan, this is considered Level 3 in the fair value hierarchy. The fair value of the investments supporting unit-linked variable annuity type liabilities is considered to be the carrying value and it is considered Level 3 in the fair value hierarchy. The fair value of the Company’s common stock investment in the Federal Home Loan Bank of Des Moines is considered to be the carrying value and it is considered Level 2 in the fair value hierarchy. The fair value of the Company's cash collateral is considered to be the carrying value and considered to be Level 1 in the fair value hierarchy.
Accrued Investment Income – The carrying value for accrued investment income approximates fair value as there are no adjustments made to the carrying value. This is considered Level 2 in the fair value hierarchy.
Interest-Sensitive Contract Liabilities – The carrying and fair values of interest-sensitive contract liabilities reflected in the table above exclude contracts with significant mortality risk. The fair value of the Company’s interest-sensitive contract liabilities utilizes a market standard technique with both capital market inputs and policyholder behavior assumptions, as well as cash values adjusted for recapture fees. The capital market inputs to the model, such as interest rates, are generally observable. Policyholder behavior assumptions are generally not observable and may require use of significant management judgment. The valuation of interest-sensitive contract liabilities is considered Level 3 in the fair value hierarchy.
Long-term Debt and Collateral Finance Facility – The fair value of the Company’s long-term debt and collateral finance facility is generally estimated by discounting future cash flows using market rates currently available for debt with similar remaining maturities and reflecting the credit risk of the Company, including inputs when available, from actively traded debt of the Company or other companies with similar credit quality. The valuation of long-term debt and collateral finance facility are generally obtained from brokers and are considered Level 3 in the fair value hierarchy.

Segment_Information

Segment Information	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Segment Information	'
	Segment Information
	The accounting policies of the segments are the same as those described in the Summary of Significant Accounting Policies in Note 2 of the consolidated financial statements accompanying the 2012 Annual Report. The Company measures segment performance primarily based on profit or loss from operations before income taxes. There are no intersegment reinsurance transactions and the Company does not have any material long-lived assets. Investment income is allocated to the segments based upon average assets and related capital levels deemed appropriate to support the segment business volumes.
	The Company allocates capital to its segments based on an internally developed economic capital model, the purpose of which is to measure the risk in the business and to provide a basis upon which capital is deployed. The economic capital model considers the unique and specific nature of the risks inherent in the Company’s businesses. As a result of the economic capital allocation process, a portion of investment income and investment related gains and losses are attributed to the segments based on the level of allocated capital. In addition, the segments are charged for excess capital utilized above the allocated economic capital basis. This charge is included in policy acquisition costs and other insurance expenses.
	The Company’s reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands).
		Three months ended September 30,						Nine months ended September 30,
	Total revenues:	2013			2012			2013			2012
	U.S.	$	1,337,562		$	1,446,834		$	4,402,212		$	4,141,202
	Canada	292,504			287,629			884,918			839,491
	Europe & South Africa	358,796			323,225			1,036,935			955,505
	Asia Pacific	376,929			364,516			1,134,071			1,101,934
	Corporate and Other	24,024			26,877			123,423			79,677
	Total	$	2,389,815		$	2,449,081		$	7,581,559		$	7,117,809
		Three months ended September 30,						Nine months ended September 30,
	Income (loss) before income taxes:	2013			2012			2013			2012
	U.S.	$	105,867		$	156,678		$	450,719		$	390,009
	Canada	41,869			37,520			113,836			127,613
	Europe & South Africa	41,553			32,166			74,756			58,363
	Asia Pacific	17,112			(16,483		)	(258,818		)	39,443
	Corporate and Other	(4,706		)	(8,402		)	25,271			(17,294		)
	Total	$	201,695		$	201,479		$	405,764		$	598,134
	The loss before income taxes for the nine months ended September 30, 2013 in the Asia Pacific segment reflects an increase in Australian group claims liabilities related to total and permanent disability coverage and disability income benefits as well as poor claims experience in the Australian operation's individual lump sum and individual disability businesses.
	Total Assets:	September 30, 2013			December 31, 2012
	U.S.	$	24,601,693		$	24,924,363
	Canada	4,065,475			3,764,002
	Europe & South Africa	2,403,094			2,235,199
	Asia Pacific	3,396,639			3,208,732
	Corporate and Other	5,059,654			6,228,142
	Total	$	39,526,555		$	40,360,438

Commitments_and_Contingent_Lia

Commitments and Contingent Liabilities	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Commitments and Contingent Liabilities	'
	Commitments and Contingent Liabilities
	At September 30, 2013, the Company’s commitments to fund investments were $241.9 million in limited partnerships, $23.1 million in commercial mortgage loans and $58.2 million in bank loans, including revolving credit agreements. At December 31, 2012, the Company’s commitments to fund investments were $176.7 million in limited partnerships, $22.2 million in commercial mortgage loans and $68.5 million in bank loans, including revolving credit agreements. The Company anticipates that the majority of its current commitments will be invested over the next five years; however, these commitments could become due any time at the request of the counterparties. Investments in limited partnerships and private placements are carried at cost or reported using the equity method and included in other invested assets in the condensed consolidated balance sheets. Bank loans are carried at fair value and included in fixed maturities available-for-sale.
	The Company is subject to litigation in the normal course of its business. The Company currently has no material litigation. A legal reserve is established when the Company is notified of an arbitration demand or litigation or is notified that an arbitration demand or litigation is imminent, it is probable that the Company will incur a loss as a result and the amount of the probable loss is reasonably capable of being estimated.
	The Company has obtained bank letters of credit in favor of various affiliated and unaffiliated insurance companies from which the Company assumes business. These letters of credit represent guarantees of performance under the reinsurance agreements and allow ceding companies to take statutory reserve credits. Certain of these letters of credit contain financial covenant restrictions. At September 30, 2013 and December 31, 2012, there were approximately $223.7 million and $45.4 million, respectively, of undrawn outstanding bank letters of credit in favor of third parties. Additionally, the Company utilizes letters of credit primarily to secure reserve credits when it retrocedes business to its subsidiaries, including Parkway Reinsurance Company (“Parkway Re”), Rockwood Reinsurance Company (“Rockwood Re”), Timberlake Financial L.L.C. (“Timberlake Financial”), RGA Americas Reinsurance, Ltd. (“RGA Americas”), RGA Reinsurance Company (Barbados) Ltd. (“RGA Barbados”) and RGA Atlantic Reinsurance Company, Ltd. (“RGA Atlantic”). The Company cedes business to its affiliates to help reduce the amount of regulatory capital required in certain jurisdictions such as the U.S. and the United Kingdom. The capital required to support the business in the affiliates reflects more realistic expectations than the original jurisdiction of the business, where capital requirements are often considered to be quite conservative. As of September 30, 2013 and December 31, 2012, $916.5 million and $763.5 million, respectively, in undrawn letters of credit from various banks were outstanding, primarily backing reinsurance between the various subsidiaries of the Company. The banks providing letters of credit to the Company are included on the National Association of Insurance Commissioners (“NAIC”) list of approved banks.
	The Company maintains seven credit facilities, a syndicated revolving credit facility with a capacity of $850.0 million and six letter of credit facilities with a combined capacity of $894.3 million. The Company may borrow cash and obtain letters of credit in multiple currencies under its syndicated revolving credit facility. The following table provides additional information on the Company’s credit facilities as of September 30, 2013 and December 31, 2012 (dollars in millions):
						Amount Utilized(1)
	Facility Capacity				Maturity Date	30-Sep-13		December 31, 2012		Basis of Fees
	$	850			December 2015	$	73.9	$	402.9	Senior unsecured long-term debt rating
	200				September 2019	200		200		Fixed
	120				May-16	115		100		Fixed
	270				Nov-17	270		—		Fixed
	100				Jun-17	92.2		—		Fixed
	52.9				Nov-13	52.9		—		Fixed
	151.4				Mar-19	151.4		—		Fixed
	-1	Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
	RGA has issued guarantees to third parties on behalf of its subsidiaries for the payment of amounts due under certain reinsurance treaties, securities borrowing arrangements, financing arrangements and office lease obligations, whereby, if a subsidiary fails to meet an obligation, RGA or one of its other subsidiaries will make a payment to fulfill the obligation. In limited circumstances, treaty guarantees are granted to ceding companies in order to provide them additional security, particularly in cases where RGA’s subsidiary is relatively new, unrated, or not of a significant size, relative to the ceding company. Liabilities supported by the treaty guarantees, before consideration for any legally offsetting amounts due from the guaranteed party, totaled $860.6 million and $686.0 million as of September 30, 2013 and December 31, 2012, respectively, and are reflected on the Company’s condensed consolidated balance sheets in future policy benefits. As of September 30, 2013 and December 31, 2012, the Company’s exposure related to treaty guarantees, net of assets held in trust, was $669.9 million and $463.5 million, respectively. Potential guaranteed amounts of future payments will vary depending on production levels and underwriting results. Guarantees related to borrowed securities provide additional security to third parties should a subsidiary fail to return the borrowed securities when due. As of September 30, 2013 and December 31, 2012, RGA’s obligation related to borrowed securities guarantees was $87.5 million. There were no amounts guaranteed under financing arrangements as of September 30, 2013 and December 31, 2012.
	Manor Reinsurance, Ltd. (“Manor Re”), a subsidiary of RGA, has obtained $300.0 million of collateral financing through 2020 from an international bank which enabled Manor Re to deposit assets in trust to support statutory reserve credits for an affiliated reinsurance transaction. The bank has recourse to RGA should Manor Re fail to make payments or otherwise not perform its obligations under this financing.
	RGA, through wholly-owned subsidiaries, has committed to provide statutory reserve support to third-parties, in exchange for a fee, by funding loans if certain defined events occur. Such statutory reserves are required under the U.S. Valuation of Life Policies Model Regulation (commonly referred to as Regulation XXX for term life insurance policies and Regulation A-XXX for universal life secondary guarantees). The third-parties have recourse to RGA should the subsidiary fail to provide the required funding, however, as of September 30, 2013, the Company does not believe that it will be required to provide any funding under these commitments as the occurrence of the defined events is considered remote. The following table presents information about these commitments (dollars in millions):
	Commitment Period		Maximum Potential Obligation
	2033		$	1,350.00
	2035		560
	In addition, the Company indemnifies its directors and officers as provided in its charters and by-laws. Since this indemnity generally is not subject to limitation with respect to duration or amount, the Company does not believe that it is possible to determine the maximum potential amount due under this indemnity in the future.

Employee_Benefit_Plans

Employee Benefit Plans	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Employee Benefit Plans	'
	Employee Benefit Plans
	The components of net periodic benefit costs for the three and nine months ended September 30, 2013 and 2012 were as follows (dollars in thousands):
		Pension Benefits						Other Benefits
		Three months ended September 30,						Three months ended September 30,
		2013			2012			2013		2012
	Service cost	$	2,000		$	1,910		$	590	$	673
	Interest Cost	1,017			1,065			392		418
	Expected return on plan assets	(933		)	(766		)	—		—
	Amortization of prior service cost	152			102			—		—
	Amortization of prior actuarial loss	808			851			279		380
	Net periodic benefit cost	$	3,044		$	3,162		$	1,261	$	1,471
		Pension Benefits						Other Benefits
		Nine months ended September 30,						Nine months ended September 30,
		2013			2012			2013		2012
	Service cost	$	6,012		$	5,638		$	1,411	$	1,231
	Interest Cost	3,055			3,135			1,015		935
	Expected return on plan assets	(2,800		)	(2,299		)	—		—
	Amortization of prior service cost	459			288			—		—
	Amortization of prior actuarial loss	2,427			2,514			651		557
	Net periodic benefit cost	$	9,153		$	9,276		$	3,077	$	2,723
	The Company has made pension contributions of $6.8 million during the first nine months of 2013 and does not expect to make any additional pension contributions in 2013.

Equity_Based_Compensation

Equity Based Compensation	9 Months Ended
	Sep. 30, 2013
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'
Equity Based Compensation	'
	Equity Based Compensation
	Equity compensation expense was $5.5 million and $3.7 million in the third quarter of 2013 and 2012, respectively. In the first quarter of 2013, the Company granted 0.7 million stock appreciation rights at $58.77 weighted average exercise price per share and 0.3 million performance contingent units to employees. Additionally, non-employee directors were granted a total of 14,200 shares of common stock. As of September 30, 2013, 1.7 million share options at $50.57 weighted average per share were vested and exercisable with a remaining weighted average exercise period of 4.9 years. As of September 30, 2013, the total compensation cost of non-vested awards not yet recognized in the condensed consolidated financial statements was $32.7 million. It is estimated that these costs will vest over a weighted average period of 2.1 years.

Retrocession_Arrangements_and_

Retrocession Arrangements and Reinsurance Ceded Receivables	9 Months Ended
	Sep. 30, 2013
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]	'
Retrocession Arrangements and Reinsurance Ceded Receivables	'
	Retrocession Arrangements and Reinsurance Ceded Receivables
	The Company generally reports retrocession activity on a gross basis. Amounts paid or deemed to have been paid for reinsurance are reflected in reinsurance ceded receivables. The cost of reinsurance related to long-duration contracts is recognized over the terms of the reinsured policies on a basis consistent with the reporting of those policies. In the normal course of business, the Company seeks to limit its exposure to loss on any single insured and to recover a portion of benefits paid by ceding reinsurance to other insurance enterprises or reinsurers under excess coverage, quota share and coinsurance contracts.
	Certain retrocessions are arranged through the Company’s retrocession pools for amounts in excess of the Company’s retention limit. As of September 30, 2013 and December 31, 2012, all rated retrocession pool participants rated by the A.M. Best Company were rated “A- (excellent)” or better. The Company verifies retrocession pool participants’ ratings on a quarterly basis. For a majority of the retrocessionaires that were not rated, security in the form of letters of credit or trust assets has been given as additional security in favor of RGA Reinsurance Company (“RGA Reinsurance”). In addition, the Company performs annual financial reviews of its retrocessionaires to evaluate financial stability and performance.
	As of September 30, 2013 and December 31, 2012, the Company had claims recoverable from retrocessionaires of $132.4 million and $156.0 million, respectively, which is included in reinsurance ceded receivables, in the condensed consolidated balance sheets. The Company considers outstanding claims recoverable in excess of 90 days to be past due. There were $6.5 million and $10.4 million of past due claims recoverable as of September 30, 2013 and December 31, 2012, respectively. Based on financial reviews of the counterparties, the Company has not established a valuation allowance for claims recoverable. The Company has never experienced a material default in connection with retrocession arrangements, nor has it experienced any difficulty in collecting claims recoverable from retrocessionaires; however, no assurance can be given as to the future performance of such retrocessionaires or as to recoverability of any such claims

Financing_and_Other_Activities

Financing and Other Activities	9 Months Ended
	Sep. 30, 2013
Repurchase Of Collateral Finance Facility Notes [Abstract]	'
Repurchase of Collateral Finance Facility Notes	'
	Financing and Other Activities
	During the first quarter of 2013, the Company repurchased $160.0 million face amount of its Series A Floating Rate Insured Notes issued by RGA’s subsidiary, Timberlake Financial, L.L.C., for $112.0 million, which was the market value at the date of the purchase. The notes were purchased by RGA Reinsurance Company, also a subsidiary of RGA. As a result, the Company recorded a pre-tax gain of $46.5 million, after fees, in other revenues at that time.
	On August 13, 2013, the Company completed its acquisition of the Dutch life insurance company Leidsche Verzekeringen Maatschappij N.V. for a total purchase price of $12.5 million. The purchase price was allocated to $147.3 million of assets and $134.8 million of liabilities at the date of acquisition. The purchased life insurance company primarily sells term life and unit-linked variable annuity policies.
	On September 19, 2013, RGA issued 4.70% Senior Notes due September 15, 2023 with a face amount of $400.0 million. These senior notes have been registered with the Securities and Exchange Commission. The net proceeds from the offering were approximately $395.1 million and will be used for general corporate purposes. Capitalized issue costs were approximately $3.4 million.

Stock_Transactions

Stock Transactions	9 Months Ended
	Sep. 30, 2013
Financing Activities And Stock Transactions [Abstract]	'
Stock Transactions	'
	Stock Transactions
	In January 2013, RGA’s board of directors authorized a share repurchase program, with no expiration date, for up to $200.0 million of RGA’s outstanding common stock. In April 2013, RGA’s board of directors authorized an increase of $100.0 million to the share repurchase program previously authorized in January 2013. In July 2013, RGA’s board of directors authorized an additional increase of $100.0 million to the share repurchase program previously authorized in January 2013. With these authorizations, the total amount of the Company’s outstanding common stock authorized for repurchase is $400.0 million.
	During the first quarter of 2013, RGA repurchased 815,011 shares of common stock under this program for $47.6 million. During the second quarter of 2013, the Company repurchased 2,865,132 shares of common stock under the program for $182.9 million. During the third quarter of 2013, the Company repurchased 471,169 shares of common stock under the program for $30.8 million. The common shares repurchased have been placed into treasury to be used for general corporate purposes. As of September 30, 2013 there was $138.7 million remaining under the board of directors authorized share repurchase program.

New_Accounting_Standards

New Accounting Standards	9 Months Ended
	Sep. 30, 2013
Accounting Changes and Error Corrections [Abstract]	'
New Accounting Standards	'
	New Accounting Standards
	Changes to the general accounting principles are established by the Financial Accounting Standards Board ("FASB") in the form of accounting standards updates to the FASB Accounting Standards Codification™. Accounting standards updates not listed below were assessed and determined to be either not applicable or are expected to have minimal impact on the Company’s consolidated financial statements.
	Adoption of New Accounting Standards
	Basis of Presentation
	In December 2011, the FASB amended the general accounting principles for Balance Sheet as it relates to the disclosures about offsetting assets and liabilities. The amendment requires disclosures about the Company’s rights of offset and related arrangements associated with its financial instruments and derivative instruments. This amendment also requires the disclosure of both gross and net information about both instruments and transactions eligible for offset in the balance sheet and instruments and transactions subject to an agreement similar to a master netting arrangement. In January 2013, the FASB amended the general accounting principles for Balance Sheet as it relates to the disclosures about offsetting assets and liabilities. This amendment clarifies that the scope of the Balance Sheet amendment made in December 2011 applies only to derivatives, including bifurcated embedded derivatives, repurchase and reverse repurchase agreements, and securities borrowing and lending transactions that are either offset or subject to an enforceable master netting agreement or a similar agreement. These amendments are effective for interim and annual reporting periods beginning on or after January 1, 2013. The Company adopted these amendments and the required disclosures are provided in Note 5 — “Derivative Instruments”.
	Transfers and Servicing
	In April 2011, the FASB amended the general accounting principles for Transfers and Servicing as it relates to the reconsideration of effective control for repurchase agreements. This amendment removes from the assessment of effective control the criterion requiring the transferor to have the ability to repurchase or redeem the financial assets and also removes the collateral maintenance implementation guidance related to that criterion. The amendment is effective for interim and annual periods beginning after December 15, 2011. The adoption of this amendment did not have an impact on the Company’s condensed consolidated financial statements.
	Fair Value Measurements and Disclosures
	In May 2011, the FASB amended the general accounting principles for Fair Value Measurements and Disclosures as it relates to the measurement and disclosure requirements about fair value measurements. This amendment clarifies the FASB’s intent about the application of existing fair value measurement requirements. It also changes particular principles and requirements for measuring fair value and for disclosing information about fair value measurements. The amendment is effective for interim and annual periods beginning after December 15, 2011. The Company adopted this amendment and the required disclosures are provided in Note 6 — “Fair Value of Assets and Liabilities.”
	Deferred Policy Acquisition Costs
	In October 2010, the FASB amended the general accounting principles for Financial Services – Insurance as it relates to accounting for costs associated with acquiring or renewing insurance contracts. This amendment clarifies that only those costs that result directly from and are essential to the contract transaction and that would not have been incurred had the contract transaction not occurred can be capitalized. It also defines acquisitions costs as costs that are related directly to the successful acquisitions of new or renewal insurance contracts. The amendment is effective for fiscal years and interim periods beginning after December 15, 2011. The retrospective adoption of this amendment on January 1, 2012, resulted in a reduction in the Company’s deferred acquisition cost asset and a corresponding reduction to equity, reflected in the financial statements in all periods. There will be a decrease in amortization subsequent to adoption due to the reduced deferred acquisition cost asset. There has also been a reduction in the level of future costs the Company defers; thereby increasing expenses incurred in future periods. The cumulative effect of the adoption of this amendment was a decrease to total stockholders’ equity of $318.4 million and a decrease in the deferred policy acquisition costs balance of $470.1 million on January 1, 2012.
	Comprehensive Income
	In February 2013, the FASB amended the general accounting principles for Comprehensive Income as it relates to the reporting of amounts reclassified out of accumulated other comprehensive income. The amendment requires entities to provide information about the amounts reclassified out of accumulated other comprehensive income by component. This amendment also requires entities to present, either on the face of the statement where net income is presented or in the notes, significant amounts reclassified out of accumulated other comprehensive income by the respective line items of net income. However, this is only necessary if the amount reclassified is required to be reclassified to net income in its entirety in the same reporting period. The amendment is effective for interim and annual reporting periods beginning after December 31, 2012. The Company adopted this amendment and the required disclosures are provided in Note 3 — “Accumulated Other Comprehensive Income.”
	In June 2011, the FASB amended the general accounting principles for Comprehensive Income as it relates to the presentation of comprehensive income. This amendment requires entities to present the total of comprehensive income, the components of net income, and the components of other comprehensive income in either a continuous statement of comprehensive income or in two separate but consecutive statements. The amendment does not change the items that must be reported in other comprehensive income. In December 2011, the FASB amended the general accounting principles for Comprehensive Income as it relates to the presentation of comprehensive income. This amendment defers the requirement to present the effects of reclassifications out of accumulated other comprehensive income on the Company’s consolidated statements of income, which was required in the Comprehensive Income amendment made in June 2011. These amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2011. The Company adopted these amendments and the required presentation is provided in the Condensed Consolidated Statements of Comprehensive Income.
	Future Adoption of New Accounting Standards
	Income Taxes
	In July 2013, the FASB amended the general accounting principles for Income Taxes as it relates to the presentation of an unrecognized tax benefit when a net operating loss carryforward, a similar tax loss, or a tax credit carryforward exists. This amendment clarifies that an unrecognized tax benefit should be presented in the financial statements as a reduction to a deferred tax asset for a net operating loss carryforward, a similar tax loss, or a tax credit carryforward. However, to the extent a net operating loss carryforward, a similar tax loss, or a tax credit carryforward is not available to settle any additional income taxes that would result from the disallowance of a tax position or the tax law of the applicable jurisdiction does not require the entity to use, and the entity does not intend to use, the deferred tax asset for such purpose, the unrecognized tax benefit should be presented in the financial statements as a liability and not combined with deferred tax assets.  These amendments are effective for fiscal years, and interim periods within those years, beginning after December 15, 2013. The adoption of this amendment is not expected to have an impact on the Company's condensed consolidated financial statements.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2013
Earnings Per Share [Abstract]	'
Schedule Of Earnings Per Share Basic And Diluted By Common Class [Text Block]	'
	The following table sets forth the computation of basic and diluted earnings per share on net income (in thousands, except per share information):
		Three months ended September 30,				Nine months ended September 30,
		2013		2012		2013		2012
	Earnings:
	Net income (loss) (numerator for basic and diluted calculations)	$	137,955	$	144,475	$	273,878	$	408,904
	Shares:
	Weighted average outstanding shares (denominator for basic calculation)	70,865		73,776		72,342		73,690
	Equivalent shares from outstanding stock options	526		362		498		388
	Denominator for diluted calculation	71,391		74,138		72,840		74,078
	Earnings per share:
	Basic	$	1.95	$	1.96	$	3.79	$	5.55
	Diluted	$	1.93	$	1.95	$	3.76	$	5.52

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2013
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]	'
Components of Accumulated Other Comprehensive Income	'
	The balance of and changes in each component of accumulated other comprehensive income (loss) (“AOCI”) for the nine months ended September 30, 2013 and 2012 are as follows (dollars in thousands):
			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated			Unrealized			Pension and			Total
			Currency			Appreciation			Postretirement
			Translation			(Depreciation)			Benefits
			Adjustments			of Investments(1)
	Balance, December 31, 2012		$	267,475		$	1,877,657		$	(36,230	)	$	2,108,902
	Other comprehensive income (loss) before reclassifications		(75,798		)	(936,847		)	(82		)	(1,012,727		)
	Amounts reclassified to AOCI		—			1,527			2,299			3,826
	Net current-period other comprehensive income (loss)		(75,798		)	(935,320		)	2,217			(1,008,901		)
	Balance, September 30, 2013		$	191,677		$	942,337		$	(34,013	)	$	1,100,001
			Accumulated Other Comprehensive Income (Loss), Net of Income Tax
			Accumulated			Unrealized			Pension and			Total
			Currency			Appreciation			Postretirement
			Translation			(Depreciation)			Benefits
			Adjustments			of Investments(1)
	Balance, December 31, 2011		$	229,795		$	1,419,318		$	(30,960	)	$	1,618,153
	Change in component during the period		43,463			488,194			1,837			533,494
	Balance, September 30, 2012		$	273,258		$	1,907,512		$	(29,123	)	$	2,151,647
	-1	Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.
Reclassification Out Of Accumulated Other Comprehensive Income	'
	The following table presents the amounts of AOCI reclassifications for the three and nine months ended September 30, 2013 (dollars in thousands):
			Amount Reclassified from AOCI
	Details about AOCI Components		Three months ended September 30, 2013			Nine months ended September 30, 2013			Affected Line Item in Statement of Income
	Unrealized gains and losses on available-for-sale securities		$	(12,736	)	$	11,122		Investment related gains (losses), net
	Gains and losses on cash flow hedge - interest rate swap		291			796			Investment income
	Deferred policy acquisition costs attributed to unrealized gains and losses(1)		(602		)	(15,433		)
			(13,047		)	(3,515		)	Total before tax
			5,009			1,988			Tax expense
			$	(8,038	)	$	(1,527	)	Net of tax
	Amortization of unrealized pension and postretirement benefits:
	Prior service cost(2)		$	(152	)	$	(459	)
	Actuarial gains/(losses)(2)		(1,087		)	(3,078		)
			(1,239		)	(3,537		)	Total before tax
			434			1,238			Tax benefit
			$	(805	)	$	(2,299	)	Net of tax
	Total reclassifications for the period		$	(8,843	)	$	(3,826	)	Net of tax
	-1	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2012 Annual Report for additional details.
	-2	These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2013
Investments [Abstract]	'
Available For Sale Securities	'
	The following tables provide information relating to investments in fixed maturity and equity securities by sector as of September 30, 2013 and December 31, 2012 (dollars in thousands):
	September 30, 2013:		Amortized				Unrealized				Unrealized				Estimated Fair			% of		Other-than-
																				temporary impairments
			Cost				Gains				Losses				Value			Total		in AOCI
	Available-for-sale:
	Corporate securities		$	11,505,673			$	637,691			$	208,802			$	11,934,562		56.1	%	$	—
	Canadian and Canadian provincial governments		2,719,147				785,840				13,831				3,491,156			16.4		—
	Residential mortgage-backed securities		922,581				44,948				15,691				951,838			4.5		(300		)
	Asset-backed securities		883,495				19,264				17,481				885,278			4.1		(2,259		)
	Commercial mortgage-backed securities		1,371,473				102,207				20,566				1,453,114			6.8		(1,609		)
	U.S. government and agencies		413,254				20,412				2,819				430,847			2		—
	State and political subdivisions		288,757				22,626				13,654				297,729			1.4		—
	Other foreign government, supranational and foreign government-sponsored enterprises		1,812,970				50,246				18,632				1,844,584			8.7		—
	Total fixed maturity securities		$	19,917,350			$	1,683,234			$	311,476			$	21,289,108		100	%	$	(4,168	)
	Non-redeemable preferred stock		$	80,985			$	5,187			$	3,333			$	82,839		56.4	%
	Other equity securities		68,123				—				4,052				64,071			43.6
	Total equity securities		$	149,108			$	5,187			$	7,385			$	146,910		100	%
	December 31, 2012:		Amortized				Unrealized				Unrealized				Estimated Fair			% of		Other-than-
																				temporary impairments
			Cost				Gains				Losses				Value			Total		in AOCI
	Available-for-sale:
	Corporate securities		$	11,333,431			$	1,085,973			$	39,333			$	12,380,071		55.5	%	$	—
	Canadian and Canadian provincial governments		2,676,777				1,372,731				174				4,049,334			18.2		—
	Residential mortgage-backed securities		969,267				76,520				3,723				1,042,064			4.7		(241		)
	Asset-backed securities		700,455				19,898				28,798				691,555			3.1		(2,259		)
	Commercial mortgage-backed securities		1,608,376				142,369				51,842				1,698,903			7.6		(6,125		)
	U.S. government and agencies		231,256				33,958				24				265,190			1.2		—
	State and political subdivisions		270,086				38,058				5,646				302,498			1.4		—
	Other foreign government, supranational and foreign government-sponsored enterprises		1,769,784				94,929				2,714				1,861,999			8.3		—
	Total fixed maturity securities		$	19,559,432			$	2,864,436			$	132,254			$	22,291,614		100	%	$	(8,625	)
	Non-redeemable preferred stock		$	68,469			$	6,542			$	170			$	74,841		33.6	%
	Other equity securities		148,577				416				1,134				147,859			66.4
	Total equity securities		$	217,046			$	6,958			$	1,304			$	222,700		100	%
Investments Classified By Contractual Maturity Date	'
	At September 30, 2013, the contractual maturities of investments in fixed maturity securities were as follows (dollars in thousands):
			Amortized				Fair
			Cost				Value
	Available-for-sale:
	Due in one year or less		$	416,152			$	421,874
	Due after one year through five years		3,712,227				3,890,251
	Due after five years through ten years		6,800,712				7,027,350
	Due after ten years		5,810,710				6,659,403
	Asset and mortgage-backed securities		3,177,549				3,290,230
	Total		$	19,917,350			$	21,289,108
Fixed Maturity Holdings Industry Types Weighted Average Credit Ratings [Table Text Block]	'
	The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of September 30, 2013 and December 31, 2012 (dollars in thousands):
	September 30, 2013:						Estimated
			Amortized Cost				Fair Value				% of Total
	Finance		$	3,728,120			$	3,870,583			32.4	%
	Industrial		5,926,283				6,125,796				51.3
	Utility		1,829,273				1,916,477				16.1
	Other		21,997				21,706				0.2
	Total		$	11,505,673			$	11,934,562			100	%
	December 31, 2012:						Estimated
			Amortized Cost				Fair Value				% of Total
	Finance		$	3,619,455			$	3,900,152			31.5	%
	Industrial		5,881,967				6,443,846				52
	Utility		1,799,658				2,002,611				16.2
	Other		32,351				33,462				0.3
	Total		$	11,333,431			$	12,380,071			100	%
RollForward Of Cumulative Credit Loss Component Of OTTI Income Loss	'
	The following table sets forth the amount of pre-tax credit loss impairments on fixed maturity securities held by the Company as of the dates indicated, for which a portion of the OTTI loss was recognized in AOCI, and the corresponding changes in such amounts (dollars in thousands):
			Three months ended September 30,
							2012
			2013
	Balance, beginning of period		$	13,324			$	45,903
	Initial impairments - credit loss OTTI recognized on securities not previously impaired		—				—
	Additional impairments - credit loss OTTI recognized on securities previously impaired		134				1,306
	Credit loss OTTI previously recognized on securities impaired to fair value during the period		—				(2,622		)
	Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(1,762		)		(20,725		)
	Balance, end of period		$	11,696			$	23,862
			Nine months ended September 30,
			2013				2012
	Balance, beginning of period		$	16,675			$	63,947
	Initial impairments - credit loss OTTI recognized on securities not previously impaired		—				1,962
	Additional impairments - credit loss OTTI recognized on securities previously impaired		134				10,187
	Credit loss OTTI previously recognized on securities impaired to fair value during the period		(1,449		)		(22,291		)
	Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		(3,664		)		(29,943		)
	Balance, end of period		$	11,696			$	23,862
Accounting for Certain Loans and Debt Securities Acquired in Transfer Disclosure [Text Block]	'
	The following tables present information on the Company’s purchased credit impaired securities, which are included in fixed maturity securities available-for-sale (dollars in thousands):
			30-Sep-13				December 31, 2012
	Outstanding principal and interest balance(1)		$	186,379			$	108,831
	Carrying value, including accrued interest(2)		$	135,862			$	84,765
	-1	Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
	-2	Estimated fair value plus accrued interest.
Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities At Acquisition Date [Table Text Block]	'
	The following table presents information about purchased credit impaired investments acquired during the periods, as of their acquisition dates (dollars in thousands).
		Nine months ended September 30,
		2013				2012
	Contractually required payments (including interest)	$	126,869			$	50,268
	Cash flows expected to be collected(1)	101,205				42,316
	Fair value of investments acquired	66,880				30,853
	-1	Represents undiscounted principal and interest cash flow expectations at the date of acquisition.
Schedule Of Certain Loans Acquired In Transfer Accounted For As Available For Sale Debt Securities Accretable Yield [Table Text Block]	'
	The following table presents activity for the accretable yield on purchased credit impaired securities for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
	Balance, beginning of period	$	66,269			$	—			$	39,239			$	—
	Investments purchased	4,374				11,463				34,325				11,463
	Accretion	(1,952		)		(6		)		(5,774		)		(6		)
	Disposals	—				—				(832		)		—
	Reclassification from nonaccretable difference	1,388				—				3,121				—
	Balance, end of period	$	70,079			$	11,457			$	70,079			$	11,457
Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures	'
	The following table presents the total gross unrealized losses for the 1,397 and 567 fixed maturity and equity securities as of September 30, 2013 and December 31, 2012, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):
			30-Sep-13							31-Dec-12
			Gross				% of Total			Gross				% of Total
			Unrealized							Unrealized
			Losses							Losses
	Less than 20%		$	286,594			89.9	%		$	54,951			41.2	%
	20% or more for less than six months		6,325				2			734				0.5
	20% or more for six months or greater		25,942				8.1			77,873				58.3
	Total		$	318,861			100	%		$	133,558			100	%
Fair Value And Investments In Debt And Marketable Equity Securities And Certain Trading Assets Disclosures	'
			Less than 12 months								12 months or greater							Total
							Gross								Gross						Gross
	September 30, 2013:		Estimated				Unrealized				Estimated				Unrealized			Estimated			Unrealized
			Fair Value				Losses				Fair Value				Losses			Fair Value			Losses
	Investment grade securities:
	Corporate securities		$	3,158,429			$	168,659			$	130,027			$	20,031		$	3,288,456		$	188,690
	Canadian and Canadian provincial governments		140,648				12,530				6,898				1,301			147,546			13,831
	Residential mortgage-backed securities		207,602				11,909				18,997				2,257			226,599			14,166
	Asset-backed securities		270,863				4,602				53,786				5,571			324,649			10,173
	Commercial mortgage-backed securities		188,153				6,565				22,435				5,968			210,588			12,533
	U.S. government and agencies		72,032				2,658				3,958				161			75,990			2,819
	State and political subdivisions		95,935				8,776				14,981				4,878			110,916			13,654
	Other foreign government, supranational and foreign government-sponsored enterprises		644,427				17,479				10,589				1,153			655,016			18,632
	Total investment grade securities		4,778,089				233,178				261,671				41,320			5,039,760			274,498
	Non-investment grade securities:
	Corporate securities		311,613				12,155				42,024				7,957			353,637			20,112
	Residential mortgage-backed securities		53,633				1,068				2,254				457			55,887			1,525
	Asset-backed securities		29,043				467				30,901				6,841			59,944			7,308
	Commercial mortgage-backed securities		971				25				10,905				8,008			11,876			8,033
	Total non-investment grade securities		395,260				13,715				86,084				23,263			481,344			36,978
	Total fixed maturity securities		$	5,173,349			$	246,893			$	347,755			$	64,583		$	5,521,104		$	311,476
	Non-redeemable preferred stock		$	42,338			$	3,331			$	1			$	2		$	42,339		$	3,333
	Other equity securities		47,151				2,619				17,028				1,433			64,179			4,052
	Total equity securities		$	89,489			$	5,950			$	17,029			$	1,435		$	106,518		$	7,385
			Less than 12 months								12 months or greater							Total
							Gross								Gross						Gross
	December 31, 2012:		Estimated				Unrealized				Estimated				Unrealized			Estimated			Unrealized
			Fair Value				Losses				Fair Value				Losses			Fair Value			Losses
	Investment grade securities:
	Corporate securities		$	786,203			$	13,276			$	108,187			$	17,386		$	894,390		$	30,662
	Canadian and Canadian provincial governments		12,349				174				—				—			12,349			174
	Residential mortgage-backed securities		22,288				97				19,394				3,199			41,682			3,296
	Asset-backed securities		59,119				449				96,179				9,508			155,298			9,957
	Commercial mortgage-backed securities		89,507				797				29,181				7,974			118,688			8,771
	U.S. government and agencies		7,272				24				—				—			7,272			24
	State and political subdivisions		20,602				1,514				11,736				4,132			32,338			5,646
	Other foreign government, supranational and foreign government-sponsored enterprises		244,817				1,953				7,435				761			252,252			2,714
	Total investment grade securities		1,242,157				18,284				272,112				42,960			1,514,269			61,244
	Non-investment grade securities:
	Corporate securities		181,168				3,170				39,123				5,501			220,291			8,671
	Residential mortgage-backed securities		15,199				80				2,633				347			17,832			427
	Asset-backed securities		3,421				26				31,938				18,815			35,359			18,841
	Commercial mortgage-backed securities		3,317				764				68,405				42,307			71,722			43,071
	Total non-investment grade securities		203,105				4,040				142,099				66,970			345,204			71,010
	Total fixed maturity securities		$	1,445,262			$	22,324			$	414,211			$	109,930		$	1,859,473		$	132,254
	Non-redeemable preferred stock		$	5,577			$	52			$	5,679			$	118		$	11,256		$	170
	Other equity securities		85,374				1,134				—				—			85,374			1,134
	Total equity securities		$	90,951			$	1,186			$	5,679			$	118		$	96,630		$	1,304
Investment Income	'
	Major categories of investment income, net of related expenses, consist of the following (dollars in thousands):
			Three months ended September 30,								Nine months ended September 30,
			2013				2012				2013				2012
	Fixed maturity securities available-for-sale		$	243,938			$	221,212			$	723,772			$	633,110
	Mortgage loans on real estate		33,013				26,938				89,618				67,258
	Policy loans		15,743				16,519				49,103				49,637
	Funds withheld at interest		80,024				127,855				376,495				305,861
	Short-term investments		374				960				1,609				3,027
	Investment receivable		—				—				—				—
	Other invested assets		9,411				13,117				36,712				35,803
	Investment revenue		382,503				406,601				1,277,309				1,094,696
	Investment expense		(13,137		)		(9,820		)		(38,578		)		(28,641		)
	Investment income, net of related expenses		$	369,366			$	396,781			$	1,238,731			$	1,066,055
Gain Loss On Investments	'
	Investment related gains (losses), net consist of the following (dollars in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013				2012
	Fixed maturities and equity securities available for sale:
	Other-than-temporary impairment losses on fixed maturities	$	(391	)		$	(1,996	)		$	(10,396	)		$	(11,562	)
	Portion of loss recognized in accumulated other comprehensive income (before taxes)	59				(559		)		(247		)		(7,618		)
	Net other-than-temporary impairment losses on fixed maturities recognized in earnings	(332		)		(2,555		)		(10,643		)		(19,180		)
	Impairment losses on equity securities	—				—				—				(3,025		)
	Gain on investment activity	21,560				53,173				70,085				102,078
	Loss on investment activity	(30,434		)		(6,668		)		(48,406		)		(23,090		)
	Other impairment losses and change in mortgage loan provision	233				(10,301		)		(1,268		)		(14,382		)
	Derivatives and other, net	(67,492		)		42,404				56,381				100,973
	Total investment related gains (losses), net	$	(76,465	)		$	76,053			$	66,149			$	143,374
Disclosure Of Real Estate Holdings By Property Type [Table Text Block]	'
	The distribution of mortgage loans, gross of valuation allowances, by property type is as follows as of September 30, 2013 and December 31, 2012 (dollars in thousands):
			30-Sep-13							31-Dec-12
			Recorded				% of Total			Recorded				% of Total
			Investment							Investment
	Apartment		$	290,678			11.7	%		$	229,266			9.9	%
	Retail		796,144				31.9			669,958				29
	Office building		854,870				34.2			825,406				35.7
	Industrial		444,186				17.8			455,682				19.7
	Other commercial		110,373				4.4			131,855				5.7
	Total		$	2,496,251			100	%		$	2,312,167			100	%
Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block]	'
	As of September 30, 2013 and December 31, 2012, the Company’s mortgage loans, gross of valuation allowances, were distributed throughout the United States as follows (dollars in thousands):
			30-Sep-13							31-Dec-12
			Recorded				% of Total			Recorded				% of Total
			Investment							Investment
	Pacific		$	658,054			26.4	%		$	593,589			25.7	%
	South Atlantic		581,781				23.3			477,068				20.5
	Mountain		260,794				10.4			233,174				10.1
	Middle Atlantic		269,602				10.8			300,475				13
	West North Central		181,937				7.3			168,063				7.3
	East North Central		239,997				9.6			224,122				9.7
	West South Central		155,061				6.2			161,451				7
	East South Central		67,155				2.7			62,789				2.7
	New England		81,870				3.3			91,436				4
	Total		$	2,496,251			100	%		$	2,312,167			100	%
Mortgage Loans Classified By Contractual Maturity Date [Table Text Block]	'
	The maturities of the mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands):
			30-Sep-13							31-Dec-12
			Recorded				% of Total			Recorded				% of Total
			Investment							Investment
	Due within five years		$	1,024,065			41	%		$	1,187,387			51.3	%
	Due after five years through ten years		963,479				38.6			776,655				33.6
	Due after ten years		508,707				20.4			348,125				15.1
	Total		$	2,496,251			100	%		$	2,312,167			100	%
Mortgage Loan Internal Credit Risk Grade [Table Text Block]	'
	Information regarding the Company’s credit quality indicators for its recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
			30-Sep-13							31-Dec-12
	Internal credit risk grade:		Recorded				% of Total			Recorded				% of Total
			Investment							Investment
	High investment grade		$	1,556,974			62.4	%		$	1,235,605			53.5	%
	Investment grade		754,369				30.2			834,494				36.1
	Average		106,912				4.3			132,607				5.7
	Watch list		49,173				2			76,463				3.3
	In or near default		28,823				1.1			32,998				1.4
	Total		$	2,496,251			100	%		$	2,312,167			100	%
Schedule Of Analysis Of Past Due Financing Receivables	'
	The age analysis of the Company’s past due recorded investment in mortgage loans, gross of valuation allowances, as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
			30-Sep-13				31-Dec-12
			$	—			$	7,504
	31-60 days past due
			—				—
	61-90 days past due
			3,046				16,886
	Greater than 90 days
			3,046				24,390
	Total past due
			2,493,205				2,287,777
	Current
			$	2,496,251			$	2,312,167
	Total
Recorded Investment And Allowance For Credit Losses	'
	The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of September 30, 2013 and December 31, 2012 (dollars in thousands):
			30-Sep-13				31-Dec-12
	Mortgage loans:
	Individually measured for impairment		$	32,624			$	39,956
	Collectively measured for impairment		2,463,627				2,272,211
	Mortgage loans, gross of valuation allowances		2,496,251				2,312,167
	Valuation allowances:
	Individually measured for impairment		4,691				6,980
	Collectively measured for impairment		2,978				4,600
	Total valuation allowances		7,669				11,580
			$	2,488,582			$	2,300,587
	Mortgage loans, net of valuation allowances
Allowance For Mortgage Loan And Lease Losses Provision For Loss Net	'
	Information regarding the Company’s loan valuation allowances for mortgage loans for the three and nine months ended September 30, 2013 and 2012 is as follows (dollars in thousands):
			Three months ended September 30,
			2013				2012
	Balance, beginning of period		$	7,903			$	11,011
	Charge-offs		—				(526		)
	Provision (release)		(234		)		2,848
	Balance, end of period		$	7,669			$	13,333
			Nine months ended September 30,
			2013				2012
	Balance, beginning of period		$	11,580			$	11,793
	Charge-offs		(2,148		)		(4,595		)
	Provision (release)		(1,763		)		6,135
	Balance, end of period		$	7,669			$	13,333
Impaired Financing Receivables Table	'
	Information regarding the portion of the Company’s mortgage loans that were impaired as of September 30, 2013 and December 31, 2012 is as follows (dollars in thousands):
			Unpaid				Recorded				Related				Carrying
			Principal				Investment				Allowance				Value
			Balance
	September 30, 2013:
	Impaired mortgage loans with no valuation allowance recorded		$	11,762			$	11,157			$	—			$	11,157
	Impaired mortgage loans with valuation allowance recorded		21,536				21,467				4,691				16,776
	Total impaired mortgage loans		$	33,298			$	32,624			$	4,691			$	27,933
	December 31, 2012:
	Impaired mortgage loans with no valuation allowance recorded		$	13,039			$	12,496			$	—			$	12,496
	Impaired mortgage loans with valuation allowance recorded		27,527				27,460				6,980				20,480
	Total impaired mortgage loans		$	40,566			$	39,956			$	6,980			$	32,976
	The Company’s average investment in impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
			Three months ended September 30,
			2013								2012
			Average				Interest				Average				Interest
			Investment(1)				Income				Investment(1)				Income
	Impaired mortgage loans with no valuation allowance recorded		$	13,631			$	349			$	11,054			$	109
			21,490				266				35,047				461
	Impaired mortgage loans with valuation allowance recorded
	Total		$	35,121			$	615			$	46,101			$	570
			Nine months ended September 30,
			2013								2012
			Average				Interest				Average				Interest
			Investment(1)				Income				Investment(1)				Income
	Impaired mortgage loans with no valuation allowance recorded		$	13,504			$	533			$	16,312			$	305
			24,337				801				36,178				1,180
	Impaired mortgage loans with valuation allowance recorded
	Total		$	37,841			$	1,334			$	52,490			$	1,485
	(1) Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances
Schedule Of Other Invested Assets [Table Text Block]	'
	Carrying values of these assets as of September 30, 2013 and December 31, 2012 are as follows (dollars in thousands):
			September 30, 2013				December 31, 2012
	Equity securities		$	146,910			$	222,700
	Limited partnerships and real estate joint ventures		417,761				356,419
	Structured loans		245,404				306,497
	Derivatives		87,421				168,208
	Other		218,895				105,719
	Total other invested assets		$	1,116,391			$	1,159,543
Investments Transferred [Table Text Block]	'
					Amortized Cost/				Estimated
					Recorded Investment				Fair Value
	Fixed maturity securities - available for sale:
		Corporate securities			$	2,585,095			$	2,606,816
		Asset-backed securities			137,251				138,918
		Commercial mortgage-backed securities			703,313				704,065
		U.S. Government and agencies securities			240,952				256,168
		State and political subdivision securities			27,297				27,555
		Other foreign government, supranational, and
			foreign government-sponsored enterprises		56,776				55,437
				Total fixed maturity securities - available for sale	3,750,684				3,788,959
	Mortgage loans on real estate				1,009,454				1,021,661
	Short-term investments				101,428				101,338
	Cash and cash equivalents				501,593				501,593
	Accrued interest				43,739				43,739
				Total	$	5,406,898			$	5,457,290

Derivative_Instruments_Tables

Derivative Instruments (Tables)	9 Months Ended
	Sep. 30, 2013
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'
Schedule Of Derivative Instruments In Statement Of Financial Position Fair Value	'
	The following table presents the notional amounts and gross fair value of derivative instruments prior to taking into account the netting effects of master netting agreements as of September 30, 2013 and December 31, 2012 (dollars in thousands):
			30-Sep-13											31-Dec-12
			Notional				Carrying Value/Fair Value							Notional				Carrying Value/Fair Value
			Amount				Assets				Liabilities			Amount				Assets				Liabilities
	Derivatives not designated as hedging instruments:
	Interest rate swaps		$	1,510,467			$	45,280			$	15,694		$	2,195,059			$	123,085			$	17,867
	Interest rate options		240,000				5,699				—			—				—				—
	Financial futures		84,192				—				—			127,877				—				—
	Foreign currency forwards		79,618				—				8,928			74,400				1,017				2,105
	Consumer price index swaps		76,306				131				19			85,135				1,446				—
	Credit default swaps		689,700				5,744				3,810			714,000				2,228				5,922
	Equity options		704,402				43,621				—			696,776				62,514				—
	Synthetic guaranteed investment contracts		3,978,244				—				—			2,018,073				—				—
	Embedded derivatives in:
	Modified coinsurance or funds withheld arrangements		—				—				175,933			—				—				243,177
	Indexed annuity products		—				—				760,746			—				—				740,256
	Variable annuity products		—				—				65,153			—				—				172,105
	Total non-hedging derivatives		7,362,929				100,475				1,030,283			5,911,320				190,290				1,181,432
	Derivatives designated as hedging instruments:
	Interest rate swaps		51,335				—				2,770			57,275				344				786
	Foreign currency swaps		780,274				9,344				4,325			629,512				—				27,398
	Total hedging derivatives		831,609				9,344				7,095			686,787				344				28,184
	Total derivatives		$	8,194,538			$	109,819			$	1,037,378		$	6,598,107			$	190,634			$	1,209,616
Offsetting Assets And Liabilities	'
	The following table provides information relating to the Company’s derivative instruments as of September 30, 2013 and December 31, 2012 (dollars in thousands):
														Gross Amounts Not
														Offset in the Balance Sheet
			Gross Amounts				Gross Amounts				Net Amounts			Financial				Cash Collateral				Net Amount
			Recognized				Offset in the				Presented in the			Instruments				Pledged/
							Balance Sheet				Balance Sheet							Received
	September 30, 2013:
	Derivative assets		$	109,819			$	(22,398	)		$	87,421		$	(10,624	)		$	(64,027	)		$	12,770
	Derivative liabilities		35,546				(22,398		)		13,148			(15,238		)		(8,150		)		(10,240		)
	December 31, 2012:
	Derivative assets		$	190,634			$	(22,426	)		$	168,208		$	(22,458	)		$	(136,414	)		$	9,336
	Derivative liabilities		54,078				(22,426		)		31,652			(1,565		)		(27,867		)		2,220
Schedule of Cash Flow Hedges Included in Accumulated Other Comprehensive Income (Loss) [Table Text Block]	'
	The following table presents the components of AOCI, before income tax, and the condensed consolidated income statement classification where the gain or loss is recognized related to cash flow hedges for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
			Three months ended September 30,
			2013				2012
	Accumulated other comprehensive income (loss), balance beginning of period		$	(5,037	)		$	(719	)
	Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		2,583				(2,831		)
	Amounts reclassified to investment income		(291		)		(351		)
	Accumulated other comprehensive income (loss), balance end of period		$	(2,745	)		$	(3,901	)
			Nine months ended September 30,
			2013				2012
	Accumulated other comprehensive income (loss), balance beginning of period		$	403			$	(828	)
	Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges		(2,352		)		(2,044		)
	Amounts reclassified to investment income		(796		)		(1,029		)
	Accumulated other comprehensive income (loss), balance end of period		$	(2,745	)		$	(3,901	)
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block]	'
	The following table presents the effects of derivatives in cash flow hedging relationships on the condensed consolidated statements of income and AOCI for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
	Derivatives in Cash Flow		Amount of Gains				Amount and Location of Gains (Losses)							Amount and Location of Gains (Losses)
	Hedging Relationships		(Losses) Deferred in				Reclassified from AOCI into Income (Loss)							Recognized in Income (Loss) on Derivatives
			AOCI on Derivatives
			(Effective Portion)				(Effective Portion)							(Ineffective Portion and Amounts Excluded
														from Effectiveness Testing)
							Investment Related				Investment Income			Investment Related				Investment Income
							Gains (Losses)							Gains (Losses)
	For the three months ended September 30, 2013:
	Interest rate swaps		$	2,583			$	—			$	291		$	(3	)		$	—
	For the three months ended September 30, 2012:
	Interest rate swaps		$	(2,831	)		$	—			$	351		$	(3	)		$	—
	For the nine months ended September 30, 2013:
	Interest rate swaps		$	(2,352	)		$	—			$	796		$	11			$	—
	For the nine months ended September 30, 2012:
	Interest rate swaps		$	(2,044	)		$	—			$	1,029		$	—			$	—
Derivatives Hedging Instruments In Net Investment Hedging Relationships	'
	The following table illustrates the Company’s net investments in foreign operations (“NIFO”) hedges for the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
			Derivative Gains (Losses) Deferred in AOCI
			For the three months ended September 30,								For the nine months ended September 30,
	Type of NIFO Hedge (1) (2)		2013				2012				2013			2012
	Foreign currency swaps		$	(14,600	)		$	(19,454	)		$	20,235		$	(23,457	)
	-1	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
	-2	There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.
Derivative Instruments Gain Loss By Income Statement Location	'
	A summary of the effect of non-hedging derivatives, including embedded derivatives, on the Company’s income statement for the three and nine months ended September 30, 2013 and 2012 is as follows (dollars in thousands):
					Gain (Loss) for the three months ended
					September 30,
	Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013				2012
	Interest rate swaps		Investment related gains (losses), net		$	(8,221	)		$	(1,437	)
	Interest rate options		Investment related gains (losses), net		(2,374		)		—
	Financial futures		Investment related gains (losses), net		(1,140		)		(3,977		)
	Foreign currency forwards		Investment related gains (losses), net		629				519
	CPI swaps		Investment related gains (losses), net		(39		)		422
	Credit default swaps		Investment related gains (losses), net		10,807				7,817
	Equity options		Investment related gains (losses), net		(24,113		)		(23,916		)
	Embedded derivatives in:
	Modco or funds withheld arrangements		Investment related gains (losses), net		(67,461		)		54,836
	Indexed annuity products		Policy acquisition costs and other insurance expenses		—				(224		)
	Indexed annuity products		Interest credited		28,379				(33,597		)
	Variable annuity products		Investment related gains (losses), net		19,829				2,579
	Total non-hedging derivatives				$	(43,704	)		$	3,022
					Gain (Loss) for the nine months ended
					September 30,
	Type of Non-hedging Derivative		Income Statement Location of Gain (Loss)		2013				2012
	Interest rate swaps		Investment related gains (losses), net		$	(68,900	)		$	24,553
	Interest rate options		Investment related gains (losses), net		(8,373		)		—
	Financial futures		Investment related gains (losses), net		(7,306		)		(10,312		)
	Foreign currency forwards		Investment related gains (losses), net		(7,988		)		(574		)
	CPI swaps		Investment related gains (losses), net		(2,027		)		(1,811		)
	Credit default swaps		Investment related gains (losses), net		17,138				14,835
	Equity options		Investment related gains (losses), net		(59,784		)		(58,532		)
	Embedded derivatives in:
	Modco or funds withheld arrangements		Investment related gains (losses), net		70,514				40,955
	Indexed annuity products		Policy acquisition costs and other insurance expenses		—				(363		)
	Indexed annuity products		Interest credited		(32,637		)		(26,059		)
	Variable annuity products		Investment related gains (losses), net		106,952				74,025
	Total non-hedging derivatives				$	7,589			$	56,717
Disclosure Of Credit Derivatives	'
	The following table presents the estimated fair value, maximum amount of future payments and weighted average years to maturity of credit default swaps sold by the Company at September 30, 2013 and December 31, 2012 (dollars in thousands):
			30-Sep-13										31-Dec-12
	Rating Agency Designation of Referenced Credit Obligations(1)		Estimated Fair				Maximum				Weighted		Estimated Fair				Maximum				Weighted
			Value of Credit				Amount of Future				Average		Value of Credit				Amount of Future				Average
			Default Swaps				Payments under				Years to		Default Swaps				Payments under				Years to
							Credit Default				Maturity(3)						Credit Default				Maturity(3)
							Swaps(2)										Swaps(2)
	AAA/AA-/A+/A/A-
	Single name credit default swaps		$	(80	)		$	112,500			5.2		$	(2,077	)		$	124,500			5.9
	Credit default swaps referencing indices		—				—				—		—				—				—
	Subtotal		(80		)		112,500				5.2		(2,077		)		124,500				5.9
	BBB+/BBB/BBB-
	Single name credit default swaps		(1,734		)		144,200				5		(2,345		)		135,500				5.5
	Credit default swaps referencing indices		3,936				415,000				4.2		937				430,000				5
	Subtotal		2,202				559,200				4.4		(1,408		)		565,500				5.1
	BB+
	Single name credit default swaps		—				—				—		(222		)		6,000				4.5
	Credit default swaps referencing indices		—				—				—		—				—				—
	Subtotal		—				—				—		(222		)		6,000				4.5
	Total		$	2,122			$	671,700			4.6		$	(3,707	)		$	696,000			5.2
	-1	The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
	-2	Assumes the value of the referenced credit obligations is zero.
	-3	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.
Changes In Estimated Fair Value Related To Embedded Derivatives	'
	The related gains (losses) and the effect on net income after amortization of deferred acquisition costs (“DAC”) and income taxes for the three and nine months ended September 30, 2013 and 2012 are reflected in the following table (dollars in thousands):
		Three months ended September 30,								Nine months ended September 30,
		2013				2012				2013			2012
	Embedded derivatives in modco or funds withheld arrangements included in investment related gains	$	(67,461	)		$	54,836			$	70,514		$	40,955
	After the associated amortization of DAC and taxes, the related amounts included in net income	(15,693		)		11,228				19,842			10,563
	Embedded derivatives in variable annuity contracts included in investment related gains	19,829				2,579				106,952			74,025
	After the associated amortization of DAC and taxes, the related amounts included in net income	11,052				1,588				52,326			494
	Amounts related to embedded derivatives in equity-indexed annuities included in benefits and expenses	28,379				(33,821		)		(32,637		)	(26,422		)
	After the associated amortization of DAC and taxes, the related amounts included in net income	6,622				(22,529		)		(53,772		)	6,465
Credit Risk	'
	Information regarding the Company’s credit exposure related to its over-the-counter derivative contracts and margin account for exchange-traded futures at September 30, 2013 and December 31, 2012 are reflected in the following table (dollars in thousands):
			30-Sep-13				31-Dec-12
	Estimated fair value of derivatives in net asset position		$	74,273			$	136,558
	Cash provided as collateral(1)		8,150				27,867
	Securities pledged to counterparties as collateral(2)		15,238				1,565
	Cash pledged from counterparties as collateral(3)		(64,027		)		(136,414		)
	Securities pledged from counterparties as collateral(4)		(10,624		)		(22,458		)
	Initial margin for cleared derivatives		(10,869		)		—
	Net credit exposure		$	12,141			$	7,118
	Margin account related to exchange-traded futures(5)		$	3,833			$	5,605
	-1	Consists of receivable from counterparty, included in other assets.
	-2	Included in other invested assets, primarily consists of U.S. Treasury securities.
	-3	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
	-4	Consists of U.S. Treasury securities.
	-5	Included in cash and cash equivalents.

Fair_Value_of_Assets_and_Liabi1

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Fair Value Disclosures [Abstract]	'
Schedule Of Fair Value Assets and Liabilities Measured on Recurring Basis Table Text Block	'
	Assets and liabilities measured at fair value on a recurring basis as of September 30, 2013 and December 31, 2012 are summarized below (dollars in thousands):
	September 30, 2013:						Fair Value Measurements Using:
			Total				Level 1				Level 2			Level 3
	Assets:
	Fixed maturity securities – available-for-sale:
	Corporate securities		$	11,934,562			$	58,111			$	10,356,155		$	1,520,296
	Canadian and Canadian provincial governments		3,491,156				—				3,491,156			—
	Residential mortgage-backed securities		951,838				—				818,567			133,271
	Asset-backed securities		885,278				—				457,198			428,080
	Commercial mortgage-backed securities		1,453,114				—				1,328,173			124,941
	U.S. government and agencies securities		430,847				362,269				65,156			3,422
	State and political subdivision securities		297,729				—				253,688			44,041
	Other foreign government supranational and foreign government-sponsored enterprises		1,844,584				302,997				1,514,427			27,160
	Total fixed maturity securities – available-for-sale		21,289,108				723,377				18,284,520			2,281,211
	Funds withheld at interest – embedded derivatives		(175,933		)		—				—			(175,933		)
	Cash equivalents		671,999				671,999				—			—
	Short-term investments		19,436				12,761				6,675			—
	Other invested assets:
	Non-redeemable preferred stock		82,839				75,279				2,735			4,825
	Other equity securities		64,071				64,071				—			—
	Derivatives:
	Interest rate swaps		29,102				—				29,102			—
	Interest rate options		5,699				—				5,699			—
	Foreign currency forwards		—				—				—			—
	CPI swaps		112				—				112			—
	Credit default swaps		1,764				—				1,764			—
	Equity options		43,482				—				43,482			—
	Foreign currency swaps		7,262				—				7,262			—
	Other		15,514				15,514				—			—
	Total other invested assets		249,845				154,864				90,156			4,825
	Total		$	22,054,455			$	1,563,001			$	18,381,351		$	2,110,103
	Liabilities:
	Interest sensitive contract liabilities – embedded derivatives		$	825,899			$	—			$	—		$	825,899
	Other liabilities:
	Derivatives:
	Interest rate swaps		2,286				—				2,286			—
	Foreign currency forwards		8,928				—				8,928			—
	Credit default swaps		(170		)		—				(170		)	—
	Equity options		(139		)		—				(139		)	—
	Foreign currency swaps		2,243				—				2,243			—
	Total		$	839,047			$	—			$	13,148		$	825,899
	December 31, 2012:						Fair Value Measurements Using:
			Total				Level 1				Level 2			Level 3
	Assets:
	Fixed maturity securities – available-for-sale:
	Corporate securities		$	12,380,071			$	43,544			$	10,667,964		$	1,668,563
	Canadian and Canadian provincial governments		4,049,334				—				4,049,334			—
	Residential mortgage-backed securities		1,042,064				—				948,133			93,931
	Asset-backed securities		691,555				—				459,164			232,391
	Commercial mortgage-backed securities		1,698,903				—				1,531,897			167,006
	U.S. government and agencies securities		265,190				192,780				67,872			4,538
	State and political subdivision securities		302,498				—				259,286			43,212
	Other foreign government, supranational and foreign government-sponsored enterprises		1,861,999				297,025				1,536,694			28,280
	Total fixed maturity securities – available-for-sale		22,291,614				533,349				19,520,344			2,237,921
	Funds withheld at interest – embedded derivatives		(243,177		)		—				—			(243,177		)
	Cash equivalents		575,864				575,864				—			—
	Short-term investments		239,131				178,923				38,177			22,031
	Other invested assets:
	Non-redeemable preferred stock		74,841				64,268				10,573			—
	Other equity securities		147,859				147,859				—			—
	Derivatives:
	Interest rate swaps		104,972				—				104,972			—
	Foreign currency forwards		1,017				—				1,017			—
CPI swaps		1,446				—				1,446			—
Credit default swaps		(1,741		)		—				(1,741		)	—
Equity options		62,514				—				62,514			—
Collateral		17,002				1,323				15,679			—
Other		11,951				11,951				—			—
Total other invested assets		419,861				225,401				194,460			—
Total		$	23,283,293			$	1,513,537			$	19,752,981		$	2,016,775
Liabilities:
Interest sensitive contract liabilities – embedded derivatives		$	912,361			$	—			$	—		$	912,361
Other liabilities:
Derivatives:
Interest rate swaps		196				—				196			—
Foreign currency forwards		2,105				—				2,105			—
Credit default swaps		1,953				—				1,953			—
Foreign currency swaps		27,398				—				27,398			—
Total		$	944,013			$	—			$	31,652		$	912,361
Fair Value Unobservable Input Measurements [Table Text Block]	'
	The following table presents quantitative information about significant unobservable inputs used in Level 3 fair value measurements developed by the Company, which does not include unobservable Level 3 asset and liability measurements provided by third parties, as of September 30, 2013 and December 31, 2012 (dollars in thousands):
	September 30, 2013:						Valuation Technique(s)		Unobservable Input		Range (Weighted Average)
			Fair Value
	Assets:
	State and political subdivision securities		$	5,032			Market comparable securities		Liquidity premium		1	%
	Corporate securities		366,372				Market comparable securities		Liquidity premium		0-2% (1%)
	Funds withheld at interest- embedded derivatives		(175,933		)		Total return swap		Mortality		0-100%  (1%)
									Lapse		0-35%  (6%)
									Withdrawal		0-5%  (3%)
									Own Credit		0-1%  (1%)
									Crediting rate		2-4%  (3%)
	Liabilities:
	Interest sensitive contract liabilities- embedded derivatives- indexed annuities		760,746				Discounted cash flow		Mortality		0-100%  (1%)
									Lapse		0-35%  (6%)
									Withdrawal		0-5%  (3%)
									Option budget projection		2-4%  (3%)
	Interest sensitive contract liabilities- embedded derivatives- variable annuities		65,153				Discounted cash flow		Mortality		0-100% (2%)
									Lapse		0-25% (5%)
									Withdrawal		0-7% (3%)
									Own Credit		0-1% (1%)
									Long-term volatility		0-27% (13%)
		December 31, 2012:		Fair Value				Valuation Technique(s)		Unobservable Input		Range (Weighted Average)
		Assets:
		State and political subdivision securities		$	5,451			Market comparable securities		Liquidity premium		1	%
		Corporate securities		450,177				Market comparable securities		Liquidity premium		0-2% (1%)
		Short-term investments		22,031				Market comparable securities		Liquidity premium		1	%
		Funds withheld at interest- embedded derivatives		(243,177		)		Total return swap		Mortality		0-100% (1%)
										Lapse		0-35% (6%)
										Withdrawal		0-5% (3%)
										Own Credit		0-1% (1%)
										Crediting Rate		2-4% (3%)
		Liabilities:
		Interest sensitive contract liabilities- embedded derivatives- indexed annuities		740,256				Discounted cash flow		Mortality		0-100% (1%)
										Lapse		0-35% (6%)
										Withdrawal		0-5% (3%)
										Option budget projection		2-4% (3%)
		Interest sensitive contract liabilities- embedded derivatives- variable annuities		172,105				Discounted cash flow		Mortality		0-100% (2%)
										Lapse		0-25% (5%)
										Withdrawal		0-7% (3%)
										Own Credit		0-1% (1%)
										Long-term volatility		0-27% (14%)
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Level Transfers [Table Text Block]	'
	The following tables present the transfers between Level 1 and Level 2 during the three and nine months ended September 30, 2013 and 2012 (dollars in thousands):
			Three months ended September 30,
			2013								2012
			Transfers from				Transfers from				Transfers from			Transfers from
			Level 1 to				Level 2 to				Level 1 to			Level 2 to
			Level 2				Level 1				Level 2			Level 1
	Fixed maturity securities - available-for-sale:
	Corporate securities		$	—			$	—			$	11,777		$	—
	Other foreign government, supranational and foreign government-sponsored enterprises		—				—				2,163			—
	Total fixed maturity securities		—				—				13,940			—
	Non-redeemable preferred stock		—				—				9,646			11,068
	Total		$	—			$	—			$	23,586		$	11,068
			Nine months ended September 30,
			2013								2012
			Transfers from				Transfers from				Transfers from			Transfers from
			Level 1 to				Level 2 to				Level 1 to			Level 2 to
			Level 2				Level 1				Level 2			Level 1
	Fixed maturity securities - available-for-sale:
	Corporate securities		$	—			$	14,012			$	14,773		$	4
	U.S. government and agencies securities		—				—				—			11,152
	State and political subdivision securities		—				—				12,794			—
	Other foreign government, supranational and foreign government-sponsored enterprises		—				—				3,222			—
	Total fixed maturity securities		—				14,012				30,789			11,156
	Non-redeemable preferred stock		—				—				9,646			11,068
	Total		$	—			$	14,012			$	40,435		$	22,224
Fair Value Assets And Liabilities Measured On Recurring Basis Unobservable Input Reconciliation [Text Block]	'
	For the three months ended September 30, 2012:		Fixed maturity securities - available-for-sale
			Corporate				Residential mortgage-backed securities				Asset-backed securities			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political subdivision securities
			securities
	Fair value, beginning of period		$	994,014			$	49,591			$	128,358		$	115,733		$	—		$	14,486
	Total gains/losses (realized/unrealized)
	Included in earnings, net:
	Investment income, net of related expenses		(4,846		)		114				54			446			(59		)	1
	Investment related gains (losses), net		(1,059		)		(187		)		(3		)	(2,088		)	—			(4		)
	Claims & other policy benefits		—				—				—			—			—			—
	Interest credited		—				—				—			—			—			—
	Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
	Included in other comprehensive income		22,280				479				7,658			6,188			(15		)	3,433
	Purchases (1)		556,031				31,020				62,109			21,092			4,640			—
	Sales(1)		(18,548		)		(24,566		)		(3,725		)	—			—			—
	Settlements(1)		(31,448		)		(1,437		)		(4,407		)	(511		)	—			(116		)
	Transfers into Level 3		1,293				1,804				5,006			26,208			—			29,150
	Transfers out of Level 3		(10,444		)		(7,459		)		(5,460		)	—			—			—
	Fair value, end of period		$	1,507,273			$	49,359			$	189,590		$	167,068		$	4,566		$	46,950
	Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
	Included in earnings, net:
	Investment income, net of related expenses		$	(4,861	)		$	28			$	40		$	446		$	(59	)	$	1
	Investment related gains (losses), net		(223		)		—				(242		)	(2,088		)	—			—
	Claims & other policy benefits		—				—				—			—			—			—
	Interest credited		—				—				—			—			—			—
	Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
	For the three months ended September 30, 2012 (continued):		Funds withheld				Short-term				Other invested			Reinsurance ceded  receivable-			Interest sensitive contract liabilities embedded derivatives
			at interest-				investments				assets- other			embedded derivatives
			embedded								equity securities
			derivatives
	Fair value, beginning of period		$	(375,337	)		$	—			$	3,227		$	4,416		$	(938,927	)
	Total gains/losses (realized/unrealized)
	Included in earnings, net:
	Investment income, net of related expenses		—				(7		)		—			—			—
	Investment related gains (losses), net		54,836				—				—			—			2,579
	Claims & other policy benefits		—				—				—			—			213
	Interest credited		—				—				—			—			(33,980		)
	Policy acquisition costs and other insurance expenses		—				—				—			(124		)	—
	Included in other comprehensive income		—				54				—			—			—
	Purchases(1)		—				22,014				—			—			(8,502		)
	Sales(1)		—				—				—			—			—
	Settlements(1)		—				—				—			(100		)	24,813
	Transfers into Level 3		—				—				—			—			—
	Transfers out of Level 3		—				—				(3,227		)	—			—
	Fair value, end of period		$	(320,501	)		$	22,061			$	—		$	4,192		$	(953,804	)
	Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
	Included in earnings, net:
	Investment income, net of related expenses		$	—			$	(7	)		$	—		$	—		$	—
	Investment related gains (losses), net		54,836				—				—			—			427
	Claims & other policy benefits		—				—				—			—			(23		)
	Interest credited		—				—				—			—			(58,621		)
	Policy acquisition costs and other insurance expenses		—				—				—			13			—
	For the nine months ended September 30, 2012:		Fixed maturity securities - available-for-sale
			Corporate securities				Residential mortgage-backed securities				Asset-backed securities			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political
																				subdivision securities
	Fair value, beginning of period		$	974,169			$	81,655			$	193,492		$	115,976		$	—		$	10,373
	Total gains/losses (realized/unrealized)
	Included in earnings, net:
	Investment income, net of related expenses		(4,738		)		413				497			1,579			(59		)	5
	Investment related gains (losses), net		(2,339		)		(223		)		(510		)	(13,771		)	—			(12		)
	Claims & other policy benefits		—				—				—			—			—			—
	Interest credited		—				—				—			—			—			—
	Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
	Included in other comprehensive income		31,940				1,886				16,135			17,436			(15		)	4,666
Purchases (1)		645,466				31,602				64,121			21,092			4,640			—
Sales(1)		(45,833		)		(40,790		)		(11,627		)	(1,552		)	—			—
Settlements(1)		(84,819		)		(5,139		)		(11,510		)	(568		)	—			(162		)
Transfers into Level 3		18,738				8,979				6,086			37,054			—			37,588
Transfers out of Level 3		(25,311		)		(29,024		)		(67,094		)	(10,178		)	—			(5,508		)
Fair value, end of period		$	1,507,273			$	49,359			$	189,590		$	167,068		$	4,566		$	46,950
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(4,747	)		$	283			$	440		$	1,579		$	(59	)	$	5
Investment related gains (losses), net		(1,329		)		(269		)		(849		)	(14,163		)	—			—
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
For the nine months ended September 30, 2012 (continued):		Funds withheld				Short-term				Other invested			Reinsurance ceded receivable-embedded derivatives			Interest sensitive contract liabilities embedded derivatives
		at interest-				investments				assets- other
		embedded								equity securities
		derivatives
Fair value, beginning of period		$	(361,456	)		$	—			$	11,489		$	4,945		$	(1,028,241	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		—				(7		)		—			—			—
Investment related gains (losses), net		40,955				—				1,098			—			74,025
Claims & other policy benefits		—				—				—			—			770
Interest credited		—				—				—			—			(27,348		)
Policy acquisition costs and other insurance expenses		—				—				—			(449		)	—
Included in other comprehensive income		—				54				843			—			—
Purchases(1)		—				22,014				108			—			(48,199		)
Sales(1)		—				—				(3,788		)	—			—
Settlements(1)		—				—				—			(304		)	75,189
Transfers into Level 3		—				—				—			—			—
Transfers out of Level 3		—				—				(9,750		)	—			—
Fair value, end of period		$	(320,501	)		$	22,061			$	—		$	4,192		$	(953,804	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	—			$	(7	)		$	—		$	—		$	—
Investment related gains (losses), net		40,955				—				(183		)	—			68,315
Claims & other policy benefits		—				—				—			—			56
Interest credited		—				—				—			—			(102,017		)
Policy acquisition costs and other insurance expenses		—				—				—			(33		)	—
-1	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
The tables below provide a summary of the changes in fair value of Level 3 assets and liabilities for the three and nine months ended September 30, 2013, as well as the portion of gains or losses included in income for the three and nine months ended September 30, 2013 attributable to unrealized gains or losses related to those assets and liabilities still held at September 30, 2013 (dollars in thousands):
For the three months ended September 30, 2013:		Fixed maturity securities - available-for-sale
		Corporate				Residential				Asset-backed			Commercial			U.S. Government
		securities				mortgage-				securities			mortgage-			and agencies
						backed							backed			securities
						securities							securities
Fair value, beginning of period		$	1,592,005			$	140,054			$	352,606		$	180,982		$	—
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(2,254		)		24				2,314			466			—
Investment related gains (losses), net		(924		)		(419		)		53			(6,864		)	—
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		587				122				370			8,998			(40		)
Purchases(1)		80,644				2,623				91,675			19,420			—
Sales(1)		(53,052		)		(1,116		)		(8,659		)	(81,253		)	—
Settlements(1)		(90,493		)		(8,017		)		(4,812		)	(233		)	—
Transfers into Level 3		2,760				—				—			3,425			3,462
Transfers out of Level 3		(8,977		)		—				(5,467		)	—			—
Fair value, end of period		$	1,520,296			$	133,271			$	428,080		$	124,941		$	3,422
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(2,096	)		$	24			$	2,314		$	301		$	—
Investment related gains (losses), net		—				—				—			(134		)	—
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—
For the three months ended September 30, 2013 (continued):		Fixed maturity securities
		available-for-sale
		State				Other foreign government, supranational and foreign government-sponsored enterprises				Funds withheld			Other invested assets- non-redeemable preferred stock			Interest sensitive contract liabilities embedded derivatives
		and political								at interest-
		subdivision								embedded
		securities								derivative
Fair value, beginning of period		$	41,275			$	26,830			$	(108,473	)	$	—		$	(878,568	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		9				(77		)		—			—			—
Investment related gains (losses), net		(4		)		—				(67,460		)	—			19,829
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			28,378
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		1,844				407				—			186			—
Purchases(1)		—				—				—			—			(16,082		)
Sales(1)		—				—				—			—			—
Settlements(1)		(62		)		—				—			—			20,544
Transfers into Level 3		979				—				—			4,639			—
Transfers out of Level 3		—				—				—			—			—
Fair value, end of period		$	44,041			$	27,160			$	(175,933	)	$	4,825		$	(825,899	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	9			$	(77	)		$	—		$	—		$	—
Investment related gains (losses), net		—				—				(67,460		)	—			19,326
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			7,834
Policy acquisition costs and other insurance expenses		—				—				—			—			—
For the nine months ended September 30, 2013:		Fixed maturity securities - available-for-sale
		Corporate				Residential				Asset-backed			Commercial mortgage-backed securities			U.S. Government and agencies securities			State and political subdivision securities
		securities				mortgage-backed				securities
						securities
Fair value, beginning of period		$	1,668,563			$	93,931			$	232,391		$	167,006		$	4,538		$	43,212
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(6,594		)		18				4,719			1,548			—			27
Investment related gains (losses), net		(1,837		)		(394		)		(1,468		)	(16,726		)	—			(12		)
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
Included in other comprehensive income		(36,123		)		(78		)		15,007			36,943			(40		)	204
Purchases(1)		256,006				54,543				220,098			19,420			—			—
Sales(1)		(109,123		)		(3,733		)		(24,951		)	(83,974		)	—			—
Settlements(1)		(236,392		)		(20,307		)		(16,248		)	(2,701		)	—			(369		)
Transfers into Level 3		10,906				14,631				8,305			3,425			3,462			979
Transfers out of Level 3		(25,110		)		(5,340		)		(9,773		)	—			(4,538		)	—
Fair value, end of period		$	1,520,296			$	133,271			$	428,080		$	124,941		$	3,422		$	44,041
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(6,313	)		$	17			$	4,711		$	1,382		$	—		$	27
Investment related gains (losses), net		(202		)		—				—			(10,243		)	—			—
Claims & other policy benefits		—				—				—			—			—			—
Interest credited		—				—				—			—			—			—
Policy acquisition costs and other insurance expenses		—				—				—			—			—			—
For the nine months ended September 30, 2013 (continued):		Fixed maturity securities
		available-for-sale
		Other foreign				Funds withheld				Short-term			Other invested assets- non-redeemable preferred stock			Interest sensitive
		government,				at interest-				investments						contract liabilities
		supranational and				embedded										embedded
		foreign government-				derivative										derivatives
		sponsored enterprises
Fair value, beginning of period		$	28,280			$	(243,177	)		$	22,031		$	—		$	(912,361	)
Total gains/losses (realized/unrealized)
Included in earnings, net:
Investment income, net of related expenses		(227		)		—				(3		)	—			—
Investment related gains (losses), net		—				67,244				—			—			106,952
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			(32,637		)
Policy acquisition costs and other insurance expenses		—				—				—			—			—
Included in other comprehensive income		(893		)		—				(28		)	186			—
Purchases(1)		—				—				—			—			(44,707		)
Sales(1)		—				—				—			—			—
Settlements(1)		—				—				(22,000		)	—			56,854
Transfers into Level 3		—				—				—			4,639			—
Transfers out of Level 3		—				—				—			—			—
Fair value, end of period		$	27,160			$	(175,933	)		$	—		$	4,825		$	(825,899	)
Unrealized gains and losses recorded in earnings for the period relating to those Level 3 assets and liabilities that were still held at the end of the period
Included in earnings, net:
Investment income, net of related expenses		$	(227	)		$	—			$	(4	)	$	—		$	—
Investment related gains (losses), net		—				67,244				—			—			104,237
Claims & other policy benefits		—				—				—			—			—
Interest credited		—				—				—			—			(89,491		)
Policy acquisition costs and other insurance expenses		—				—				—			—			—
-1	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.
Fair Value, Assets and Liabilities Measured on Nonrecurring Basis [Table Text Block]	'
			Three months ended September 30,
	(dollars in thousands)		2013											2012
			Carrying Value				Estimated Fair				Net			Carrying Value			Estimated Fair			Net
			Prior to				Value After				Investment			Prior to Measurement			Value After			Investment
			Measurement				Measurement				Gains (Losses)						Measurement			Gains (Losses)
	Mortgage loans(1)		$	13,528			$	13,575			$	47		$	25,092		$	23,467		$	(1,625	)
	Limited partnership interests(2)		—				—				—			23,012			15,558			(7,454		)
			Nine months ended September 30,
			2013											2012
			Carrying Value				Estimated Fair				Net			Carrying Value			Estimated Fair			Net
			Prior to				Value After				Investment			Prior to			Value After			Investment
			Measurement				Measurement				Gains (Losses)			Measurement			Measurement			Gains (Losses)
	Mortgage loans(1)		$	13,436			$	13,575			$	139		$	27,836		$	23,467		$	(4,369	)
	Limited partnership interests(2)		11,590				9,161				(2,429		)	25,191			16,944			(8,247		)
	Real estate(3)		4,736				4,136				(600		)	—			—			—
	-1	Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows.
	-2	Limited partnership interests — The impaired investments presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.
	-3	Real estate investment - The impaired real estate investments presented above were written down to their estimated fair value at the date of impairment and are reported as losses above. The impairments were based on third-party appraisal values obtained and reviewed by the Company.
Financial Instruments Carrying Amounts And Estimated Fair Value [Text Block]	'
	30-Sep-13		Carrying Value				Estimated				Fair Value Measurement Using:
							Fair Value				Level 1			Level 2			Level 3
	Assets:
	Mortgage loans on real estate		$	2,488,582			$	2,515,250			$	—		$	—		$	2,515,250
	Policy loans		1,244,878				1,244,878				—			1,244,878			—
	Funds withheld at interest(1)		5,917,002				6,144,891				—			—			6,144,891
	Cash and cash equivalents(2)		751,236				751,236				751,236			—			—
	Short-term investments(2)		24,756				24,756				24,756			—			—
	Other invested assets(2)		652,759				694,909				4,956			31,436			658,517
	Accrued investment income		262,330				262,330				—			262,330			—
	Liabilities:
	Interest-sensitive contract liabilities(1)		$	11,104,386			$	10,923,043			$	—		$	—		$	10,923,043
	Long-term debt		2,214,170				2,348,049				—			—			2,348,049
	Collateral finance facility		484,712				365,307				—			—			365,307
	December 31, 2012:		Carrying Value				Estimated				Fair Value Measurement Using:
							Fair Value				Level 1			Level 2			Level 3
	Assets:
	Mortgage loans on real estate		$	2,300,587			$	2,426,688			$	—		$	—		$	2,426,688
	Policy loans		1,278,175				1,278,175				—			1,278,175			—
	Funds withheld at interest(1)		5,837,359				6,362,324				—			—			6,362,324
	Cash and cash equivalents(2)		684,028				684,028				684,028			—			—
	Short-term investments(2)		48,951				48,951				48,951			—			—
	Other invested assets(2)		596,336				626,358				—			32,250			594,108
	Accrued investment income		201,344				201,344				—			201,344			—
	Liabilities:
	Interest-sensitive contract liabilities(1)		$	11,566,962			$	11,926,339			$	—		$	—		$	11,926,339
	Long-term debt		1,815,253				2,014,062				—			—			2,014,062
	Collateral finance facility		652,010				456,050				—			—			456,050
	-1	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
	-2	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Segment_Information_Tables

Segment Information (Tables)	9 Months Ended
	Sep. 30, 2013
Segment Reporting [Abstract]	'
Reconciliation Of Revenue From Segments To Consolidated Text Block	'
	The Company’s reportable segments are strategic business units that are primarily segregated by geographic region. Information related to revenues, income (loss) before income taxes and total assets of the Company for each reportable segment are summarized below (dollars in thousands).
		Three months ended September 30,						Nine months ended September 30,
	Total revenues:	2013			2012			2013			2012
	U.S.	$	1,337,562		$	1,446,834		$	4,402,212		$	4,141,202
	Canada	292,504			287,629			884,918			839,491
	Europe & South Africa	358,796			323,225			1,036,935			955,505
	Asia Pacific	376,929			364,516			1,134,071			1,101,934
	Corporate and Other	24,024			26,877			123,423			79,677
	Total	$	2,389,815		$	2,449,081		$	7,581,559		$	7,117,809
Reconciliation Of Operating Profit Loss From Segments To Consolidated Text Block	'
		Three months ended September 30,						Nine months ended September 30,
	Income (loss) before income taxes:	2013			2012			2013			2012
	U.S.	$	105,867		$	156,678		$	450,719		$	390,009
	Canada	41,869			37,520			113,836			127,613
	Europe & South Africa	41,553			32,166			74,756			58,363
	Asia Pacific	17,112			(16,483		)	(258,818		)	39,443
	Corporate and Other	(4,706		)	(8,402		)	25,271			(17,294		)
	Total	$	201,695		$	201,479		$	405,764		$	598,134
Reconciliation Of Assets From Segment To Consolidated Text Block	'
	Total Assets:	September 30, 2013			December 31, 2012
	U.S.	$	24,601,693		$	24,924,363
	Canada	4,065,475			3,764,002
	Europe & South Africa	2,403,094			2,235,199
	Asia Pacific	3,396,639			3,208,732
	Corporate and Other	5,059,654			6,228,142
	Total	$	39,526,555		$	40,360,438

Commitments_and_Contingent_Lia1

Commitments and Contingent Liabilities (Tables)	9 Months Ended
	Sep. 30, 2013
Commitments and Contingencies Disclosure [Abstract]	'
Credit Facilities	'
	The following table provides additional information on the Company’s credit facilities as of September 30, 2013 and December 31, 2012 (dollars in millions):
						Amount Utilized(1)
	Facility Capacity				Maturity Date	30-Sep-13		December 31, 2012		Basis of Fees
	$	850			December 2015	$	73.9	$	402.9	Senior unsecured long-term debt rating
	200				September 2019	200		200		Fixed
	120				May-16	115		100		Fixed
	270				Nov-17	270		—		Fixed
	100				Jun-17	92.2		—		Fixed
	52.9				Nov-13	52.9		—		Fixed
	151.4				Mar-19	151.4		—		Fixed
	-1	Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.
Commitment Obligations	'
	The following table presents information about these commitments (dollars in millions):
	Commitment Period		Maximum Potential Obligation
	2033		$	1,350.00
	2035		560

Employee_Benefit_Plans_Tables

Employee Benefit Plans (Tables)	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Schedule Of Defined Benefit Plans Disclosures Text Block	'
	The components of net periodic benefit costs for the three and nine months ended September 30, 2013 and 2012 were as follows (dollars in thousands):
		Pension Benefits						Other Benefits
		Three months ended September 30,						Three months ended September 30,
		2013			2012			2013		2012
	Service cost	$	2,000		$	1,910		$	590	$	673
	Interest Cost	1,017			1,065			392		418
	Expected return on plan assets	(933		)	(766		)	—		—
	Amortization of prior service cost	152			102			—		—
	Amortization of prior actuarial loss	808			851			279		380
	Net periodic benefit cost	$	3,044		$	3,162		$	1,261	$	1,471
		Pension Benefits						Other Benefits
		Nine months ended September 30,						Nine months ended September 30,
		2013			2012			2013		2012
	Service cost	$	6,012		$	5,638		$	1,411	$	1,231
	Interest Cost	3,055			3,135			1,015		935
	Expected return on plan assets	(2,800		)	(2,299		)	—		—
	Amortization of prior service cost	459			288			—		—
	Amortization of prior actuarial loss	2,427			2,514			651		557
	Net periodic benefit cost	$	9,153		$	9,276		$	3,077	$	2,723

Earnings_Per_Share_Reconciliat

Earnings Per Share (Reconciliation of the Numerators and Denominators of the Basic and Diluted Per Shares) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Earnings:	'	'	'	'
Net income (numerator for basic and diluted calculations)	$137,955	$144,475	$273,878	$408,904
Shares:	'	'	'	'
Weighted average outstanding shares (denominator for basic calculation)	70,865	73,776	72,342	73,690
Equivalent shares from outstanding stock options	526	362	498	388
Denominator for diluted calculation	71,391	74,138	72,840	74,078
Earnings Per Share:	'	'	'	'
Basic earnings per share	$1.95	$1.96	$3.79	$5.55
Diluted earnings per share	$1.93	$1.95	$3.76	$5.52

Earnings_Per_Share_Narrative_D

Earnings Per Share (Narrative) (Details)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
	Stock Options [Member]	Stock Options [Member]	Contingently Issuable Shares [Member]	Contingently Issuable Shares [Member]
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]	'	'	'	'
Antidilutive Securities Excluded From Computation Of Earnings Per Share Amount	0	700	700	700

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Balance of and Changes in Each Component of AOCI) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'		'		'		'
Balance, Beginning of Period	'		'		$2,108,902		$1,618,153
Other comprehensive income (loss) before reclassifications	'		'		-1,012,727		'
Amounts reclassified from AOCI	'		'		3,826		'
Net current-period other comprehensive income (loss)	-82,133		352,449		-1,008,901		533,494
Change in component during the period	'		'		'		533,494
Balance, End of Period	1,100,001		2,151,647		1,100,001		2,151,647
Accumulated Currency Translation Adjustments [Member]	'		'		'		'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'		'		'		'
Balance, Beginning of Period	'		'		267,475		229,795
Other comprehensive income (loss) before reclassifications	'		'		-75,798		'
Amounts reclassified from AOCI	'		'		0		'
Net current-period other comprehensive income (loss)	'		'		-75,798		'
Change in component during the period	'		'		'		43,463
Balance, End of Period	191,677		273,258		191,677		273,258
Unrealized Appreciation Of Securities [Member]	'		'		'		'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'		'		'		'
Balance, Beginning of Period	'		'		1,877,657	[1]	1,419,318	[1]
Other comprehensive income (loss) before reclassifications	'		'		-936,847	[1]	'
Amounts reclassified from AOCI	'		'		1,527	[1]	'
Net current-period other comprehensive income (loss)	'		'		-935,320	[1]	'
Change in component during the period	'		'		'		488,194	[1]
Balance, End of Period	942,337	[1]	1,907,512	[1]	942,337	[1]	1,907,512	[1]
Pension And Postretirement Benefits [Member]	'		'		'		'
Accumulated Other Comprehensive Income Loss Net Of Tax [Line Items]	'		'		'		'
Balance, Beginning of Period	'		'		-36,230		-30,960
Other comprehensive income (loss) before reclassifications	'		'		-82		'
Amounts reclassified from AOCI	'		'		2,299		'
Net current-period other comprehensive income (loss)	'		'		2,217		'
Change in component during the period	'		'		'		1,837
Balance, End of Period	($34,013)		($29,123)		($34,013)		($29,123)
[1]	Includes cash flow hedges. See Note 5 - “Derivative Instruments” for additional information on cash flow hedges.

Accumulated_Other_Comprehensiv3

Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI) (Details) (USD $)	3 Months Ended			9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012	Sep. 30, 2013		Sep. 30, 2012
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Investment related gains (losses), net	($76,133)		$78,608	$76,792		$162,554
Investment income	369,366		396,781	1,238,731		1,066,055
Total before tax	201,695		201,479	405,764		598,134
Tax (expense) benefit	-63,740		-57,004	-131,886		-189,230
Net income	137,955		144,475	273,878		408,904
Unrealized Appreciation Depreciation Of Investments [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Total before tax	-13,047		'	-3,515		'
Tax (expense) benefit	5,009		'	1,988		'
Net income	-8,038		'	-1,527		'
Unrealized Appreciation Depreciation Of Investments [Member] | Unrealized Gains Losses On Available For Sale Securities [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Investment related gains (losses), net	-12,736		'	11,122		'
Unrealized Appreciation Depreciation Of Investments [Member] | Gains Losses On Qualifying Cash Flow Hedging Instruments [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Investment income	291		'	796		'
Unrealized Appreciation Depreciation Of Investments [Member] | DAC Attributed To Unrealized Gains Losses [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Deferred policy acquisition costs attributed to unrealized gains and losses	-602	[1]	'	-15,433	[1]	'
Amortization Of Unrealized Pension And Postretirement Benefits [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Total before tax	-1,239		'	-3,537		'
Tax (expense) benefit	434		'	1,238		'
Net income	-805		'	-2,299		'
Amounts Reclassified From AOCI [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Net income	-8,843		'	-3,826		'
Prior Service Cost [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Prior service cost	-152	[2]	'	-459	[2]	'
Actuarial Gains Losses [Member] | Amortization Of Unrealized Pension And Postretirement Benefits [Member]	'		'	'		'
Reclassification Adjustment Out Of Accumulated Other Comprehensive Income [Line Items]	'		'	'		'
Actuarial gains/(losses)	($1,087)	[2]	'	($3,078)	[2]	'
[1]	This AOCI component is included in the computation of the deferred policy acquisition cost. See Note 8 – “Deferred Policy Acquisition Costs” of the 2012 Annual Report for additional details.
[2]	These AOCI components are included in the computation of the net periodic pension cost. See Note 9 – “Employee Benefit Plans” for additional details.

Investments_Investments_in_Fix

Investments (Investments in Fixed Maturity and Equity Securities Available-for-Sale by Sector) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	$11,505,673	$11,333,431
Unrealized Losses	318,861	133,558
Estimated Fair Value	11,934,562	12,380,071
% of Total	100.00%	100.00%
Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	19,917,350	19,559,432
Unrealized Gains	1,683,234	2,864,436
Unrealized Losses	311,476	132,254
Estimated Fair Value	21,289,108	22,291,614
% of Total	100.00%	100.00%
Other-than-temporary impairments in AOCI	-4,168	-8,625
Equity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	149,108	217,046
Unrealized Gains	5,187	6,958
Unrealized Losses	7,385	1,304
Estimated Fair Value	146,910	222,700
% of Total	100.00%	100.00%
Corporate securities | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	11,505,673	11,333,431
Unrealized Gains	637,691	1,085,973
Unrealized Losses	208,802	39,333
Estimated Fair Value	11,934,562	12,380,071
% of Total	56.10%	55.50%
Other-than-temporary impairments in AOCI	0	0
Canadian and Canadian provincial governments | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	2,719,147	2,676,777
Unrealized Gains	785,840	1,372,731
Unrealized Losses	13,831	174
Estimated Fair Value	3,491,156	4,049,334
% of Total	16.40%	18.20%
Other-than-temporary impairments in AOCI	0	0
Residential mortgage-backed securities | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	922,581	969,267
Unrealized Gains	44,948	76,520
Unrealized Losses	15,691	3,723
Estimated Fair Value	951,838	1,042,064
% of Total	4.50%	4.70%
Other-than-temporary impairments in AOCI	-300	-241
Asset-backed securities | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	883,495	700,455
Unrealized Gains	19,264	19,898
Unrealized Losses	17,481	28,798
Estimated Fair Value	885,278	691,555
% of Total	4.10%	3.10%
Other-than-temporary impairments in AOCI	-2,259	-2,259
Commercial Mortgage Backed Securities [Member] | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	1,371,473	1,608,376
Unrealized Gains	102,207	142,369
Unrealized Losses	20,566	51,842
Estimated Fair Value	1,453,114	1,698,903
% of Total	6.80%	7.60%
Other-than-temporary impairments in AOCI	-1,609	-6,125
US government and agencies | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	413,254	231,256
Unrealized Gains	20,412	33,958
Unrealized Losses	2,819	24
Estimated Fair Value	430,847	265,190
% of Total	2.00%	1.20%
Other-than-temporary impairments in AOCI	0	0
State and political subdivisions | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	288,757	270,086
Unrealized Gains	22,626	38,058
Unrealized Losses	13,654	5,646
Estimated Fair Value	297,729	302,498
% of Total	1.40%	1.40%
Other-than-temporary impairments in AOCI	0	0
Other foreign government, supranational and foreign government-sponsored enterprises | Fixed maturity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	1,812,970	1,769,784
Unrealized Gains	50,246	94,929
Unrealized Losses	18,632	2,714
Estimated Fair Value	1,844,584	1,861,999
% of Total	8.70%	8.30%
Other-than-temporary impairments in AOCI	0	0
Nonredeemable Preferred Stock [Member] | Equity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	80,985	68,469
Unrealized Gains	5,187	6,542
Unrealized Losses	3,333	170
Estimated Fair Value	82,839	74,841
% of Total	56.40%	33.60%
Other equity securities | Equity securities	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized Cost	68,123	148,577
Unrealized Gains	0	416
Unrealized Losses	4,052	1,134
Estimated Fair Value	$64,071	$147,859
% of Total	43.60%	66.40%

Investments_Amortized_Cost_and

Investments (Amortized Cost and Fair Value of Fixed Maturities by Contractual Maturities) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Available For Sale Securities Debt Maturities Amortized Cost	'	'
Due in one year or less	$416,152	'
Due after one year through five years	3,712,227	'
Due after five year through ten years	6,800,712	'
Due after ten years	5,810,710	'
Asset and mortgage-backed securities	3,177,549	'
Total	19,917,350	19,559,432
Available For Sale Securities Debt Maturities Fair Value	'	'
Due in one year or less	421,874	'
Due after one year through five years	3,890,251	'
Due after five year through ten years	7,027,350	'
Due after ten years	6,659,403	'
Asset and mortgage-backed securities	3,290,230	'
Total	$21,289,108	$22,291,614

Investments_Amortized_Cost_and1

Investments (Amortized Cost and Fair Value of Fixed Maturitiy Holdings by Industry Type) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Corporate Securities by Investment Sector And Credit Rating [Line Items]	'	'
Amortized Cost	$11,505,673	$11,333,431
Estimated Fair Value	11,934,562	12,380,071
% of Total	100.00%	100.00%
Finance	'	'
Corporate Securities by Investment Sector And Credit Rating [Line Items]	'	'
Amortized Cost	3,728,120	3,619,455
Estimated Fair Value	3,870,583	3,900,152
% of Total	32.40%	31.50%
Industrial	'	'
Corporate Securities by Investment Sector And Credit Rating [Line Items]	'	'
Amortized Cost	5,926,283	5,881,967
Estimated Fair Value	6,125,796	6,443,846
% of Total	51.30%	52.00%
Utility	'	'
Corporate Securities by Investment Sector And Credit Rating [Line Items]	'	'
Amortized Cost	1,829,273	1,799,658
Estimated Fair Value	1,916,477	2,002,611
% of Total	16.10%	16.20%
Other	'	'
Corporate Securities by Investment Sector And Credit Rating [Line Items]	'	'
Amortized Cost	21,997	32,351
Estimated Fair Value	$21,706	$33,462
% of Total	0.20%	0.30%

Investments_Credit_Losses_Reco

Investments (Credit Losses Recognized in Earnings on Fixed Maturity Securities Held by the Company) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Other Than Temporary Impairment Credit Losses Recognized In Earnings Roll Forward	'	'	'	'
Balance, beginning of period	$13,324	$45,903	$16,675	$63,947
Initial impairments - credit loss OTTI recognized on securities not previously impaired	0	0	0	1,962
Additional impairments - credit loss OTTI recognized on securities previously impaired	134	1,306	134	10,187
Credit loss OTTI previously recognized on securities impaired to fair value during the period	0	-2,622	-1,449	-22,291
Credit loss impairments previously recognized on securities which were sold during the period	-1,762	-20,725	-3,664	-29,943
Balance, end of period	$11,696	$23,862	$11,696	$23,862

Investments_Purchased_Credit_I

Investments (Purchased Credit Impaired Securities Included in Fixed Maturity Securities) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities [Abstract]	'		'
Outstanding principal and interest balance	$186,379	[1]	$108,831	[1]
Carrying value, including accrued interest	$135,862	[2]	$84,765	[2]
[1]	Represents the contractually required payments which is the sum of contractual principal, whether or not currently due, and accrued interest.
[2]	Estimated fair value plus accrued interest.

Investments_Purchased_Credit_I1

Investments (Purchased Credit Impaired Investments) (Details) (USD $)	Sep. 30, 2013		Sep. 30, 2012
In Thousands, unless otherwise specified
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Acquired [Abstract]	'		'
Contractually required payments (including interest)	$126,869		$50,268
Cash flows expected to be collected	101,205	[1]	42,316	[1]
Fair value of investments acquired	$66,880		$30,853
[1]	Represents undiscounted principal and interest cash flow expectations at the date of acquisition.

Investments_Accretable_Yield_o

Investments (Accretable Yield on Purchased Credit Impaired Securities) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Certain Loans Acquired in Transfer Accounted for as Available-for-sale Debt Securities, Accretable Yield Movement Schedule [Roll Forward]	'	'	'	'
Balance, beginning of period	$66,269	$0	$39,239	$0
Investments purchased	4,374	11,463	34,325	11,463
Accretion	-1,952	-6	-5,774	-6
Certain Loans Acquired in Transfer Not Accounted for as Debt Securities, Accretable Yield, Disposals of Loans	0	0	-832	0
Reclassification to nonaccretable difference	1,388	0	3,121	0
Balance, end of period	$70,079	$11,457	$70,079	$11,457

Investments_Fair_Value_Below_A

Investments (Fair Value Below Amortized Cost of Gross Unrealized Losses for Fixed Maturity and Equity Securities) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Gross unrealized losses with number of securities [Line Items]	'	'
Gross Unrealized Losses	$318,861	$133,558
% of Total	100.00%	100.00%
Less than 20%	'	'
Gross unrealized losses with number of securities [Line Items]	'	'
Gross Unrealized Losses	286,594	54,951
% of Total	89.90%	41.20%
20% or more for less than six months	'	'
Gross unrealized losses with number of securities [Line Items]	'	'
Gross Unrealized Losses	6,325	734
% of Total	2.00%	0.50%
20% or more for six months or greater	'	'
Gross unrealized losses with number of securities [Line Items]	'	'
Gross Unrealized Losses	$25,942	$77,873
% of Total	8.10%	58.30%

Investments_Fair_Value_and_Los

Investments (Fair Value and Losses by Investment Category and Legth of Time in a Loss Position) (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	$5,173,349	$1,445,262
Gross Unrealized Losses - Less than 12 months	246,893	22,324
Estimated Fair Value - 12 months or greater	347,755	414,211
Gross Unrealized Losses - 12 months or greater	64,583	109,930
Estimated Fair Value	5,521,104	1,859,473
Gross Unrealized Losses	311,476	132,254
Equity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	89,489	90,951
Gross Unrealized Losses - Less than 12 months	5,950	1,186
Estimated Fair Value - 12 months or greater	17,029	5,679
Gross Unrealized Losses - 12 months or greater	1,435	118
Estimated Fair Value	106,518	96,630
Gross Unrealized Losses	7,385	1,304
Non-investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	395,260	203,105
Gross Unrealized Losses - Less than 12 months	13,715	4,040
Estimated Fair Value - 12 months or greater	86,084	142,099
Gross Unrealized Losses - 12 months or greater	23,263	66,970
Estimated Fair Value	481,344	345,204
Gross Unrealized Losses	36,978	71,010
Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	4,778,089	1,242,157
Gross Unrealized Losses - Less than 12 months	233,178	18,284
Estimated Fair Value - 12 months or greater	261,671	272,112
Gross Unrealized Losses - 12 months or greater	41,320	42,960
Estimated Fair Value	5,039,760	1,514,269
Gross Unrealized Losses	274,498	61,244
Corporate securities | Non-investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	311,613	181,168
Gross Unrealized Losses - Less than 12 months	12,155	3,170
Estimated Fair Value - 12 months or greater	42,024	39,123
Gross Unrealized Losses - 12 months or greater	7,957	5,501
Estimated Fair Value	353,637	220,291
Gross Unrealized Losses	20,112	8,671
Corporate securities | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	3,158,429	786,203
Gross Unrealized Losses - Less than 12 months	168,659	13,276
Estimated Fair Value - 12 months or greater	130,027	108,187
Gross Unrealized Losses - 12 months or greater	20,031	17,386
Estimated Fair Value	3,288,456	894,390
Gross Unrealized Losses	188,690	30,662
Canadian and Canadian provincial governments | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	140,648	12,349
Gross Unrealized Losses - Less than 12 months	12,530	174
Estimated Fair Value - 12 months or greater	6,898	0
Gross Unrealized Losses - 12 months or greater	1,301	0
Estimated Fair Value	147,546	12,349
Gross Unrealized Losses	13,831	174
Residential mortgage-backed securities | Non-investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	53,633	15,199
Gross Unrealized Losses - Less than 12 months	1,068	80
Estimated Fair Value - 12 months or greater	2,254	2,633
Gross Unrealized Losses - 12 months or greater	457	347
Estimated Fair Value	55,887	17,832
Gross Unrealized Losses	1,525	427
Residential mortgage-backed securities | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	207,602	22,288
Gross Unrealized Losses - Less than 12 months	11,909	97
Estimated Fair Value - 12 months or greater	18,997	19,394
Gross Unrealized Losses - 12 months or greater	2,257	3,199
Estimated Fair Value	226,599	41,682
Gross Unrealized Losses	14,166	3,296
Asset-backed securities | Non-investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	29,043	3,421
Gross Unrealized Losses - Less than 12 months	467	26
Estimated Fair Value - 12 months or greater	30,901	31,938
Gross Unrealized Losses - 12 months or greater	6,841	18,815
Estimated Fair Value	59,944	35,359
Gross Unrealized Losses	7,308	18,841
Asset-backed securities | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	270,863	59,119
Gross Unrealized Losses - Less than 12 months	4,602	449
Estimated Fair Value - 12 months or greater	53,786	96,179
Gross Unrealized Losses - 12 months or greater	5,571	9,508
Estimated Fair Value	324,649	155,298
Gross Unrealized Losses	10,173	9,957
Commercial mortgage-backed securities | Non-investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	971	3,317
Gross Unrealized Losses - Less than 12 months	25	764
Estimated Fair Value - 12 months or greater	10,905	68,405
Gross Unrealized Losses - 12 months or greater	8,008	42,307
Estimated Fair Value	11,876	71,722
Gross Unrealized Losses	8,033	43,071
Commercial mortgage-backed securities | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	188,153	89,507
Gross Unrealized Losses - Less than 12 months	6,565	797
Estimated Fair Value - 12 months or greater	22,435	29,181
Gross Unrealized Losses - 12 months or greater	5,968	7,974
Estimated Fair Value	210,588	118,688
Gross Unrealized Losses	12,533	8,771
US Government Agencies Debt Securities [Member] | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	72,032	7,272
Gross Unrealized Losses - Less than 12 months	2,658	24
Estimated Fair Value - 12 months or greater	3,958	0
Gross Unrealized Losses - 12 months or greater	161	0
Estimated Fair Value	75,990	7,272
Gross Unrealized Losses	2,819	24
State and political subdivisions | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	95,935	20,602
Gross Unrealized Losses - Less than 12 months	8,776	1,514
Estimated Fair Value - 12 months or greater	14,981	11,736
Gross Unrealized Losses - 12 months or greater	4,878	4,132
Estimated Fair Value	110,916	32,338
Gross Unrealized Losses	13,654	5,646
Other foreign government, supranational and foreign government-sponsored enterprises | Investment grade securities | Fixed maturity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	644,427	244,817
Gross Unrealized Losses - Less than 12 months	17,479	1,953
Estimated Fair Value - 12 months or greater	10,589	7,435
Gross Unrealized Losses - 12 months or greater	1,153	761
Estimated Fair Value	655,016	252,252
Gross Unrealized Losses	18,632	2,714
Nonredeemable Preferred Stock [Member] | Equity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	42,338	5,577
Gross Unrealized Losses - Less than 12 months	3,331	52
Estimated Fair Value - 12 months or greater	1	5,679
Gross Unrealized Losses - 12 months or greater	2	118
Estimated Fair Value	42,339	11,256
Gross Unrealized Losses	3,333	170
Other equity securities | Equity securities	'	'
Estimated Fair Values And Gross Unrealized Losses, OTTI Impairment Losses Reported In AOCI [Line Items]	'	'
Estimated Fair Value - Less than 12 months	47,151	85,374
Gross Unrealized Losses - Less than 12 months	2,619	1,134
Estimated Fair Value - 12 months or greater	17,028	0
Gross Unrealized Losses - 12 months or greater	1,433	0
Estimated Fair Value	64,179	85,374
Gross Unrealized Losses	$4,052	$1,134

Investments_Investment_Income_

Investments (Investment Income Net of Related Expenses) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	$382,503	$406,601	$1,277,309	$1,094,696
Investment expense	-13,137	-9,820	-38,578	-28,641
Investment income, net of related expenses	369,366	396,781	1,238,731	1,066,055
Available-for-sale Securities [Member]	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	243,938	221,212	723,772	633,110
Mortgage Loans on Real Estate [Member]	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	33,013	26,938	89,618	67,258
Policy loans	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	15,743	16,519	49,103	49,637
Funds withheld at interest	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	80,024	127,855	376,495	305,861
Short-term Investments [Member]	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	374	960	1,609	3,027
Investment receivable	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	0	0	0	0
Other invested assets	'	'	'	'
Major Categories Of Investment Income Net of Expenses [Line Items]	'	'	'	'
Investment revenue	$9,411	$13,117	$36,712	$35,803

Investments_Investment_Related

Investments (Investment Related Gains (Losses) Net) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Investment Gains And Losses [Abstract]	'	'	'	'
Other-than-temporary impairments on fixed maturity securities	($391)	($1,996)	($10,396)	($11,562)
Portion of loss recognized in accumulated other comprehensive income (before taxes)	59	-559	-247	-7,618
Net other-than-temporary impairment losses on fixed maturities recognized in earnings	-332	-2,555	-10,643	-19,180
Impairment losses on equity securities	0	0	0	-3,025
Gain on investment activity	21,560	53,173	70,085	102,078
Loss on investment activity	-30,434	-6,668	-48,406	-23,090
Other impairment losses and change in mortgage loan provision	233	-10,301	-1,268	-14,382
Derivatives and other, net	-67,492	42,404	56,381	100,973
Total investment related gains (losses), net	($76,465)	$76,053	$66,149	$143,374

Investments_Mortgage_Loans_by_

Investments (Mortgage Loans by Property Type) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	$2,496,251	$2,312,167
Percentage of total	100.00%	100.00%
Apartment	'	'
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	290,678	229,266
Percentage of total	11.70%	9.90%
Retail	'	'
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	796,144	669,958
Percentage of total	31.90%	29.00%
Office building	'	'
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	854,870	825,406
Percentage of total	34.20%	35.70%
Industrial	'	'
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	444,186	455,682
Percentage of total	17.80%	19.70%
Other commercial	'	'
Mortgage Loans Property Type Indicators [Line Items]	'	'
Recorded investment	$110,373	$131,855
Percentage of total	4.40%	5.70%

Investments_Mortgage_Loans_by_1

Investments (Mortgage Loans by Real Estate Geographic Location) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	$2,496,251	$2,312,167
Percentage of total	100.00%	100.00%
Pacific	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	658,054	593,589
Percentage of total	26.40%	25.70%
South Atlantic	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	581,781	477,068
Percentage of total	23.30%	20.50%
Mountain	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	260,794	233,174
Percentage of total	10.40%	10.10%
Middle Atlantic	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	269,602	300,475
Percentage of total	10.80%	13.00%
West North Central	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	181,937	168,063
Percentage of total	7.30%	7.30%
East North Central	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	239,997	224,122
Percentage of total	9.60%	9.70%
West South Central	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	155,061	161,451
Percentage of total	6.20%	7.00%
East South Central	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	67,155	62,789
Percentage of total	2.70%	2.70%
New England	'	'
Mortgage Loans On Real Estate Geographic Location Of Property [Line Items]	'	'
Recorded investment	$81,870	$91,436
Percentage of total	3.30%	4.00%

Investments_Mortgage_Loans_by_2

Investments (Mortgage Loans by Maturity Date) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Mortgage Loans on Real Estate [Line Items]	'	'
Mortgage loans, gross of valuation allowances	$2,496,251	$2,312,167
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
Due within five years	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Mortgage loans, gross of valuation allowances	1,024,065	1,187,387
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	41.00%	51.30%
Due after five years through ten years	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Mortgage loans, gross of valuation allowances	963,479	776,655
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	38.60%	33.60%
Due after ten years	'	'
Mortgage Loans on Real Estate [Line Items]	'	'
Mortgage loans, gross of valuation allowances	$508,707	$348,125
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	20.40%	15.10%

Investments_Mortgage_Loans_by_3

Investments (Mortgage Loans by Credit Quality Indicator) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	$2,496,251	$2,312,167
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	100.00%	100.00%
High investment grade	'	'
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	1,556,974	1,235,605
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	62.40%	53.50%
Investment grade	'	'
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	754,369	834,494
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	30.20%	36.10%
Average	'	'
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	106,912	132,607
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	4.30%	5.70%
Watch list	'	'
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	49,173	76,463
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	2.00%	3.30%
In or near default	'	'
Credit Quality Indicators [Line Items]	'	'
Mortgage loans, gross of valuation allowances	$28,823	$32,998
Mortgage Loans On Real Estate Commercial And Consumer Net Percentage Of Total	1.10%	1.40%

Investments_Age_Analysis_of_Pa

Investments (Age Analysis of Past Due Recorded Investment In Mortgage Loans) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable Recorded Investment Aging	'	'
Total mortgage loans	$2,496,251	$2,312,167
Investment in mortgage loans	'	'
Financing Receivable Recorded Investment Aging	'	'
31-60 days past due	0	7,504
61-90 days past due	0	0
Greater than 90 days	3,046	16,886
Total past due	3,046	24,390
Current	2,493,205	2,287,777
Total mortgage loans	$2,496,251	$2,312,167

Investments_Mortgage_Loans_by_4

Investments (Mortgage Loans by Method of Evaluation and Related Valuation Allowances) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Mortgage Loans:	'	'
Total mortgage loans	$2,496,251	$2,312,167
Mortgage Loans Net Of Valuation Allowances [Abstract]	'	'
Mortgage loans on real estate (net of valuation allowances)	2,488,582	2,300,587
Commercial Real Estate Portfolio Segment	'	'
Mortgage Loans:	'	'
Evaluated individually for credit losses	32,624	39,956
Evaluated collectively for credit losses	2,463,627	2,272,211
Total mortgage loans	2,496,251	2,312,167
Valuation Allowances:	'	'
Specific for credit losses	4,691	6,980
Non-specifically identified credit losses	2,978	4,600
Total valuation allowances	$7,669	$11,580

Investments_Loan_Valuation_All

Investments (Loan Valuation Allowance for Mortgage Loans) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Allowance For Loan And Lease Losses Roll Forward	'	'	'	'
Balance, Beginning of Period	$7,903	$11,011	$11,580	$11,793
Charge-offs	0	-526	-2,148	-4,595
Provision (release)	-234	2,848	-1,763	6,135
Balance, End of Period	$7,669	$13,333	$7,669	$13,333

Investments_Impaired_Mortgage_

Investments (Impaired Mortgage Loans) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012		Dec. 31, 2012
Financing Receivable Impaired [Line Items]	'		'		'		'		'
Unpaid Principal Balance	$33,298		'		$33,298		'		$40,566
Recorded Investment	32,624		'		32,624		'		39,956
Related Allowance	4,691		'		4,691		'		6,980
Carrying Value	27,933		'		27,933		'		32,976
Average Investment	35,121	[1]	46,101	[1]	37,841	[1]	52,490	[1]	'
Interest Income	615		570		1,334		1,485		'
Impaired mortgage loans with valuation allowance recorded	'		'		'		'		'
Financing Receivable Impaired [Line Items]	'		'		'		'		'
Unpaid Principal Balance	21,536		'		21,536		'		27,527
Recorded Investment	21,467		'		21,467		'		27,460
Related Allowance	4,691		'		4,691		'		6,980
Carrying Value	16,776		'		16,776		'		20,480
Average Investment	21,490	[1]	35,047	[1]	24,337	[1]	36,178	[1]	'
Interest Income	266		461		801		1,180		'
Impaired mortgage loans with no valuation allowance recorded	'		'		'		'		'
Financing Receivable Impaired [Line Items]	'		'		'		'		'
Unpaid Principal Balance	11,762		'		11,762		'		13,039
Recorded Investment	11,157		'		11,157		'		12,496
Related Allowance	0		'		0		'		0
Carrying Value	11,157		'		11,157		'		12,496
Average Investment	13,631	[1]	11,054	[1]	13,504	[1]	16,312	[1]	'
Interest Income	$349		$109		$533		$305		'
[1]	Average recorded investment represents the average loan balances as of the beginning of period and all subsequent quarterly end of period balances.

Investments_Other_Invested_Ass

Investments (Other Invested Assets) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Other Investments [Line Items]	'	'
Other invested assets	$1,116,391	$1,159,543
Equity securities	'	'
Other Investments [Line Items]	'	'
Other invested assets	146,910	222,700
Limited partnerships and real estate joint ventures	'	'
Other Investments [Line Items]	'	'
Other invested assets	417,761	356,419
Structured loans	'	'
Other Investments [Line Items]	'	'
Other invested assets	245,404	306,497
Derivatives	'	'
Other Investments [Line Items]	'	'
Other invested assets	87,421	168,208
Other	'	'
Other Investments [Line Items]	'	'
Other invested assets	$218,895	$105,719

Investments_Narrative_Details

Investments (Narrative) (Details) (USD $)

3 Months Ended

9 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

12 Months Ended

9 Months Ended

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2013

Dec. 31, 2012

Sep. 30, 2012

securities

securities

securities

Collateral Fixed Maturity Securities

Collateral Fixed Maturity Securities

Canadian Province Of Ontario Securities

Canadian Province Of Ontario Securities

Canadian Province Of Quebec Securities

Canadian Province Of Quebec Securities

Available For Sale Securities Amortized Cost [Member]

Available For Sale Securities Amortized Cost [Member]

Available For Sale Securities Fair Value Disclosure [Member]

Available For Sale Securities Fair Value Disclosure [Member]

Investment in mortgage loans

Investment in mortgage loans

Asset-backed and mortgage-backed securities

Asset-backed and mortgage-backed securities

Fixed maturity securities

Fixed maturity securities

Fixed maturity securities

Fixed maturity securities

Fixed maturity securities

Fixed maturity securities

Reported Value Measurement [Member]

Non-investment grade securities

Non-investment grade securities

Non-investment grade securities

Non-investment grade securities

Corporate securities

Corporate securities

Non-investment grade securities

Non-investment grade securities

Investment Narrative [Line Items]

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Transfer to Investments

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$5,406,898,000

Available-for-sale Securities, Continuous Unrealized Loss Position, Aggregate Loss

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

311,476,000

132,254,000

36,978,000

71,010,000

20,112,000

8,671,000

'

Available-for-sale Securities, Amortized Cost Basis

11,505,673,000

'

11,505,673,000

'

11,333,431,000

53,800,000

16,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities held in trust

'

'

'

'

'

'

'

'

'

'

'

7,954,600,000

7,549,000,000

8,260,600,000

7,913,800,000

'

'

'

'

'

'

'

'

'

'

'

Proceeds From Sale Of Available For Sale Securities Sold At Loss

410,400,000

220,500,000

872,200,000

622,100,000

'

92,200,000

95,600,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Available-for-sale Securities

11,934,562,000

'

11,934,562,000

'

12,380,071,000

54,500,000

17,000,000

1,238,500,000

1,400,000,000

1,479,400,000

1,785,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities as a percentage of consolidated stockholder equity

10.00%

'

10.00%

'

10.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Number of fixed maturity and equity securities in an unrealized loss position

1,397

'

1,397

'

567

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Gross Unrealized Losses - 12 months or greater

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

15,300,000

61,500,000

64,583,000

109,930,000

23,263,000

66,970,000

7,957,000

5,501,000

'

Net other-than-temporary impairment losses on fixed maturities recognized in earnings

-332,000

-2,555,000

-10,643,000

-19,180,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Realized losses on fixed maturity and equity securities sold

-30,434,000

-6,668,000

-48,406,000

-23,090,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Minimum percentage of fair value

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities Borrowed

'

'

'

'

'

'

'

'

'

'

'

87,500,000

87,500,000

87,500,000

87,500,000

'

'

'

'

'

'

'

'

'

'

'

Collateral Obtained Percent Of Fair Value Reverse Repurchase Agreements

'

'

100.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities pledged or received

292,400,000

'

292,400,000

'

290,200,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities Sold under Agreements to Repurchase, Fair Value of Collateral

307,000,000

'

307,000,000

'

305,900,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Securities Sold under Agreements to Repurchase, Collateral, Right to Reclaim Securities

347,500,000

'

347,500,000

'

342,000,000

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage loans percentage of total investments

7.80%

'

7.80%

'

7.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Maximum loan to value ratio on mortgage loan approval

'

'

75.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Mortgage loans on nonaccrual status

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

$3,046,000

$16,886,000

'

'

'

'

'

'

'

'

'

Policy loans, percentage of total investments

3.90%

'

3.90%

'

3.90%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Funds withheld at interest, percentage of total investments

18.00%

'

18.00%

'

17.00%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Funds withheld at interest, percentage attibutable to one client

70.00%

'

70.00%

'

69.70%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Other invested assets, percentage of total investments

3.50%

'

3.50%

'

3.50%

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

'

Investments_Investments_Transf

Investments Investments (Transfers) (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2012
Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	$5,406,898
Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	5,457,290
Mortgage Loans on Real Estate [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	1,009,454
Mortgage Loans on Real Estate [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	1,021,661
Short-term Investments [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	101,428
Short-term Investments [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	101,338
Cash and Cash Equivalents [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	501,593
Cash and Cash Equivalents [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	501,593
Accrued Interest [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	43,739
Accrued Interest [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	43,739
Fixed Maturities [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	3,750,684
Fixed Maturities [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	3,788,959
Fixed Maturities [Member] | Corporate securities | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	2,585,095
Fixed Maturities [Member] | Corporate securities | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	2,606,816
Fixed Maturities [Member] | Asset-backed securities | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	137,251
Fixed Maturities [Member] | Asset-backed securities | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	138,918
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	703,313
Fixed Maturities [Member] | Commercial Mortgage Backed Securities [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	704,065
Fixed Maturities [Member] | US Government Agencies Debt Securities [Member] | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	240,952
Fixed Maturities [Member] | US Government Agencies Debt Securities [Member] | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	256,168
Fixed Maturities [Member] | State and political subdivisions | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	27,297
Fixed Maturities [Member] | State and political subdivisions | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	27,555
Fixed Maturities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Reported Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	56,776
Fixed Maturities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Estimate of Fair Value Measurement [Member]	'
Transfer To Investments [Line Items]	'
Transfer to Investments	$55,437

Derivative_Instruments_Gross_N

Derivative Instruments (Gross Notional Amount and Fair Value of Derivatives Contracts) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative [Line Items]	'	'
Notional Amount	$8,194,538	$6,598,107
Carrying Value / Fair Value of Assets	109,819	190,634
Carrying Value / Fair Value of Liabilities	1,037,378	1,209,616
Not Designated as Hedging Instrument	'	'
Derivative [Line Items]	'	'
Notional Amount	7,362,929	5,911,320
Carrying Value / Fair Value of Assets	100,475	190,290
Carrying Value / Fair Value of Liabilities	1,030,283	1,181,432
Not Designated as Hedging Instrument | Interest Rate Swaps	'	'
Derivative [Line Items]	'	'
Notional Amount	1,510,467	2,195,059
Carrying Value / Fair Value of Assets	45,280	123,085
Carrying Value / Fair Value of Liabilities	15,694	17,867
Not Designated as Hedging Instrument | Interest Rate Options	'	'
Derivative [Line Items]	'	'
Notional Amount	240,000	0
Carrying Value / Fair Value of Assets	5,699	0
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Financial Futures	'	'
Derivative [Line Items]	'	'
Notional Amount	84,192	127,877
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Foreign Currency Forwards	'	'
Derivative [Line Items]	'	'
Notional Amount	79,618	74,400
Carrying Value / Fair Value of Assets	0	1,017
Carrying Value / Fair Value of Liabilities	8,928	2,105
Not Designated as Hedging Instrument | Consumer Price Index Swaps	'	'
Derivative [Line Items]	'	'
Notional Amount	76,306	85,135
Carrying Value / Fair Value of Assets	131	1,446
Carrying Value / Fair Value of Liabilities	19	0
Not Designated as Hedging Instrument | Credit Default Swaps	'	'
Derivative [Line Items]	'	'
Notional Amount	689,700	714,000
Carrying Value / Fair Value of Assets	5,744	2,228
Carrying Value / Fair Value of Liabilities	3,810	5,922
Not Designated as Hedging Instrument | Equity Options	'	'
Derivative [Line Items]	'	'
Notional Amount	704,402	696,776
Carrying Value / Fair Value of Assets	43,621	62,514
Carrying Value / Fair Value of Liabilities	0	0
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements	'	'
Derivative [Line Items]	'	'
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	175,933	243,177
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity Products	'	'
Derivative [Line Items]	'	'
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	760,746	740,256
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity Products	'	'
Derivative [Line Items]	'	'
Notional Amount	0	0
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	65,153	172,105
Not Designated as Hedging Instrument | Synthetic Guaranteed Investment Contracts	'	'
Derivative [Line Items]	'	'
Notional Amount	3,978,244	2,018,073
Carrying Value / Fair Value of Assets	0	0
Carrying Value / Fair Value of Liabilities	0	0
Designated As Hedging Instrument	'	'
Derivative [Line Items]	'	'
Notional Amount	831,609	686,787
Carrying Value / Fair Value of Assets	9,344	344
Carrying Value / Fair Value of Liabilities	7,095	28,184
Designated As Hedging Instrument | Interest Rate Swaps	'	'
Derivative [Line Items]	'	'
Notional Amount	51,335	57,275
Carrying Value / Fair Value of Assets	0	344
Carrying Value / Fair Value of Liabilities	2,770	786
Designated As Hedging Instrument | Foreign Currency Swaps	'	'
Derivative [Line Items]	'	'
Notional Amount	780,274	629,512
Carrying Value / Fair Value of Assets	9,344	0
Carrying Value / Fair Value of Liabilities	$4,325	$27,398

Derivative_Instruments_Derivat

Derivative Instruments (Derivative Instruments Offsetting Balance Sheet) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Derivative Assets [Abstract]	'		'
Gross Amounts Recognized	$109,819		$190,634
Gross Amounts Offset in the Balance Sheet	-22,398		-22,426
Net Amounts Presented in the Balance Sheet	87,421		168,208
Derivative Asset, Fair Value of Collateral	-10,624	[1]	-22,458	[1]
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	-64,027	[2]	-136,414	[2]
Net Amount	12,770		9,336
Derivative Liabilities [Abstract]	'		'
Gross Amounts Recognized	35,546		54,078
Gross Amounts Offset in the Balance Sheet	-22,398		-22,426
Net Amounts Presented in the Balance Sheet	13,148		31,652
Gross Amounts Not Offset in the Balance Sheet - Financial Instruments	-15,238	[3]	-1,565	[3]
Gross Amounts Not Offset in the Balance Sheet - Cash Collateral Pledged/Received	-8,150	[4]	-27,867	[4]
Net Amount	($10,240)		$2,220
[1]	Consists of U.S. Treasury securities.
[2]	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[3]	Included in other invested assets, primarily consists of U.S. Treasury securities.
[4]	Consists of receivable from counterparty, included in other assets.

Derivative_Instruments_Current

Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
AOCI Cash Flow Hedges [Roll Forward]	'	'	'	'
Balance beginning	($5,037)	($719)	$403	($828)
Gains (losses) deferred in other comprehensive income (loss) on the effective portion of cash flow hedges	2,583	-2,831	-2,352	-2,044
Amounts reclassified to investment income	-291	-351	-796	-1,029
Balance ending	($2,745)	($3,901)	($2,745)	($3,901)

Derivative_Instruments_Cash_Fl

Derivative Instruments (Cash Flow Hedges) (Details) (Interest Rate Swaps, USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Derivatives In Cash Flow Hedging Relationships [Line Items]	'	'	'	'
Gains Losses Deferred In Accumulated Other Comprehensive Income Loss On Derivatives Effective Portion	$2,583	($2,831)	($2,352)	($2,044)
Investment Related Gains Losses [Member]	'	'	'	'
Derivatives In Cash Flow Hedging Relationships [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	0	0	0	0
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	-3	-3	11	0
Investment Income [Member]	'	'	'	'
Derivatives In Cash Flow Hedging Relationships [Line Items]	'	'	'	'
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net	291	351	796	1,029
Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net	$0	$0	$0	$0

Derivative_Instruments_Hedges_

Derivative Instruments (Hedges of Net Investments in Foreign Operations) (Details) (Currency Swap [Member], USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Currency Swap [Member]	'		'		'		'
Derivatives, Fair Value [Line Items]	'		'		'		'
Net Derivatives Gains (Losses) Deferred in AOCI	($14,600)	[1],[2]	($19,454)	[1],[2]	$20,235	[1],[2]	($23,457)	[1],[2]
[1]	There were no sales or substantial liquidations of net investments in foreign operations that would have required the reclassification of gains or losses from accumulated other comprehensive income (loss) into investment income during the periods presented.
[2]	There was no ineffectiveness recognized for the Company’s hedges of net investments in foreign operations.

Derivative_Instruments_Non_Hed

Derivative Instruments (Non Hedging Derivatives and Embedded Derivatives Effect on Income Statement) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	($76,465)	$76,053	$66,149	$143,374
Policy acquisition costs and other insurance expenses	-268,081	-318,106	-995,943	-961,679
Interest credited	-59,939	-130,341	-303,767	-285,080
Not Designated as Hedging Instrument	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-43,704	3,022	7,589	56,717
Not Designated as Hedging Instrument | Interest Rate Swaps	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-8,221	-1,437	-68,900	24,553
Not Designated as Hedging Instrument | Interest Rate Options	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-2,374	0	-8,373	0
Not Designated as Hedging Instrument | Financial Futures	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-1,140	-3,977	-7,306	-10,312
Not Designated as Hedging Instrument | Foreign Currency Forwards	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	629	519	-7,988	-574
Not Designated as Hedging Instrument | Consumer Price Index Swaps	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-39	422	-2,027	-1,811
Not Designated as Hedging Instrument | Credit Default Swaps	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	10,807	7,817	17,138	14,835
Not Designated as Hedging Instrument | Equity Options	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-24,113	-23,916	-59,784	-58,532
Not Designated as Hedging Instrument | Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-67,461	54,836	70,514	40,955
Not Designated as Hedging Instrument | Embedded Derivatives In Indexed Annuity Products	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Policy acquisition costs and other insurance expenses	0	-224	0	-363
Interest credited	28,379	-33,597	-32,637	-26,059
Not Designated as Hedging Instrument | Embedded Derivatives In Variable Annuity Products	'	'	'	'
Income Affect Of Non Hedging Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	$19,829	$2,579	$106,952	$74,025

Derivative_Instruments_Exposur

Derivative Instruments (Exposure from Credit Derivatives by Rating of the Underlying Credits) (Details) (USD $)	9 Months Ended		12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	$2,122	[1]	($3,707)	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	671,700	[1],[2]	696,000	[1],[2]
Derivative Average Remaining Maturity	'4 years 7 months 6 days	[1],[3]	'5 years 2 months 12 days	[1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Single Name Credit Default Swaps [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	-80	[1]	-2,077	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	112,500	[1],[2]	124,500	[1],[2]
Derivative Average Remaining Maturity	'5 years 2 months 12 days	[1],[3]	'5 years 10 months 24 days	[1],[3]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Swaps Referencing Indices [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	0	[1]	0	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	0	[1],[2]	0	[1],[2]
Standard Poors AAA To A Minus Ratings [Member] | Credit Default Subtotal [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	-80	[1]	-2,077	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	112,500	[1],[2]	124,500	[1],[2]
Derivative Average Remaining Maturity	'5 years 2 months 12 days	[1],[3]	'5 years 10 months 24 days	[1],[3]
Standard Poors BBB Rating [Member] | Single Name Credit Default Swaps [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	-1,734	[1]	-2,345	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	144,200	[1],[2]	135,500	[1],[2]
Derivative Average Remaining Maturity	'5 years	[1],[3]	'5 years 6 months	[1],[3]
Standard Poors BBB Rating [Member] | Credit Default Swaps Referencing Indices [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	3,936	[1]	937	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	415,000	[1],[2]	430,000	[1],[2]
Derivative Average Remaining Maturity	'4 years 2 months 12 days	[1],[3]	'5 years	[1],[3]
Standard Poors BBB Rating [Member] | Credit Default Subtotal [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	2,202	[1]	-1,408	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	559,200	[1],[2]	565,500	[1],[2]
Derivative Average Remaining Maturity	'4 years 4 months 24 days	[1],[3]	'5 years 1 month 6 days	[1],[3]
Standard Poors BB Rating [Member] | Single Name Credit Default Swaps [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	0	[1]	-222	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	0	[1],[2]	6,000	[1],[2]
Derivative Average Remaining Maturity	'		'4 years 6 months	[1],[3]
Standard Poors BB Rating [Member] | Credit Default Swaps Referencing Indices [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	0	[1]	0	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	0	[1],[2]	0	[1],[2]
Standard Poors BB Rating [Member] | Credit Default Subtotal [Member]	'		'
Credit Derivatives [Line Items]	'		'
Credit Derivative Current Fair Value	0	[1]	-222	[1]
Maximum Potential Future Exposure on Credit Risk Derivatives	$0	[1],[2]	$6,000	[1],[2]
Derivative Average Remaining Maturity	'		'4 years 6 months	[1],[3]
[1]	The rating agency designations are based on ratings from Standard and Poor’s (“S&P”).
[2]	Assumes the value of the referenced credit obligations is zero.
[3]	The weighted average years to maturity of the credit default swaps is calculated based on weighted average notional amounts.

Derivative_Instruments_Changes

Derivative Instruments (Changes in Estimated Fair Value Related to Embedded Derivatives) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	($76,465)	$76,053	$66,149	$143,374
Total benefits and expenses	2,188,120	2,247,602	7,175,795	6,519,675
Net income	137,955	144,475	273,878	408,904
Embedded Derivatives In Modified Coinsurance Or Funds Withheld Arrangements	'	'	'	'
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	-67,461	54,836	70,514	40,955
Net income	-15,693	11,228	19,842	10,563
Embedded Derivatives In Equity Indexed Annuities [Member]	'	'	'	'
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]	'	'	'	'
Total benefits and expenses	28,379	-33,821	-32,637	-26,422
Net income	6,622	-22,529	-53,772	6,465
Embedded Derivatives In Variable Annuity Contracts [Member]	'	'	'	'
Changes In Estimated Fair Value Related To Embedded Derivatives [Line Items]	'	'	'	'
Total investment related gains (losses), net	19,829	2,579	106,952	74,025
Net income	$11,052	$1,588	$52,326	$494

Derivative_Instruments_Credit_

Derivative Instruments (Credit Exposure of Derivative Contracts) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Credit Exposure of Derivative Contracts	'		'
Estimated fair value of derivatives in net asset (liability) position	$74,273		$136,558
Derivative, Collateral, Right to Reclaim Cash	8,150	[1]	27,867	[1]
Derivative Liability, Fair Value of Collateral	15,238	[2]	1,565	[2]
Derivative, Collateral, Obligation to Return Cash	-64,027	[3]	-136,414	[3]
Derivative Asset, Fair Value of Collateral	-10,624	[4]	-22,458	[4]
Deposits with Clearing Organizations and Others, Securities	-10,869		0
Net credit exposure	12,141		7,118
Margin account related to exchange-traded futures	$3,833	[5]	$5,605	[5]
[1]	Consists of receivable from counterparty, included in other assets.
[2]	Included in other invested assets, primarily consists of U.S. Treasury securities.
[3]	Included in cash and cash equivalents, with obligation to return cash collateral recorded in other liabilities.
[4]	Consists of U.S. Treasury securities.
[5]	Included in cash and cash equivalents.

Derivative_Instruments_Narrati

Derivative Instruments (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Derivative Instruments and Hedging Activities Disclosure [Abstract]	'	'	'	'	'
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net	$0.60	'	$0.60	'	'
Cumulative Foreign Currency Translation Gain Loss Recorded In Accumulated Other Comprehensive Income Loss For Terminated Net Investment In Foreign Operations Hedges	3.8	'	3.8	'	-16.4
Gain Loss On Investments Related To Change In Fair Value Of Derivatives Excluding Embedded Derivatives	-24.5	-20.6	-137.2	-31.8	'
Embedded Derivative Gain Loss In Financial Statements From Use Of Own Credit Risk	1	-6.2	-1	-63.4	'
Embedded Derivative Gain Loss On Variable Annuity Contracts In Financial Statements From Use Of Own Credit Risk	($3.70)	($28.30)	($8.60)	$23.20	'

Fair_Value_of_Assets_and_Liabi2

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Balances of Assets and Liabilities Measured at Fair Value on a Recurring Basis) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	$21,289,108	$22,291,614
Funds withheld at interest embedded derivatives	-175,933	-243,177
Cash and cash equivalents	671,999	575,864
Short-term investments	19,436	239,131
Other invested assets	249,845	419,861
Total Assets	22,054,455	23,283,293
Liabilities Fair Value Disclosure	'	'
Interest-sensitive contract liabilities - embedded derivatives	825,899	912,361
Total Liabilities	839,047	944,013
Nonredeemable Preferred Stock [Member]	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	82,839	74,841
Other equity securities	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	64,071	147,859
Securities Pledged As Collateral Member	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	'	17,002
Other	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	15,514	11,951
Interest Rate Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	29,102	104,972
Liabilities Fair Value Disclosure	'	'
Other liabilities	2,286	196
Interest Rate Options	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	5,699	'
Foreign Currency Forwards	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	1,017
Liabilities Fair Value Disclosure	'	'
Other liabilities	8,928	2,105
Equity Option	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	43,482	62,514
Liabilities Fair Value Disclosure	'	'
Other liabilities	-139	'
Consumer Price Index Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	112	1,446
Credit Default Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	1,764	-1,741
Liabilities Fair Value Disclosure	'	'
Other liabilities	-170	1,953
Foreign Currency Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	7,262	'
Liabilities Fair Value Disclosure	'	'
Other liabilities	2,243	27,398
Corporate securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	11,934,562	12,380,071
Canadian and Canadian provincial governments	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	3,491,156	4,049,334
Residential mortgage-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	951,838	1,042,064
Asset-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	885,278	691,555
Commercial Mortgage Backed Securities [Member]	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	1,453,114	1,698,903
US Treasury And Government Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	430,847	265,190
State and political subdivisions	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	297,729	302,498
Other foreign government, supranational and foreign government-sponsored enterprises	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	1,844,584	1,861,999
Fair Value Inputs Level 1 Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	723,377	533,349
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	671,999	575,864
Short-term investments	12,761	178,923
Other invested assets	154,864	225,401
Total Assets	1,563,001	1,513,537
Liabilities Fair Value Disclosure	'	'
Interest-sensitive contract liabilities - embedded derivatives	0	0
Total Liabilities	0	0
Fair Value Inputs Level 1 Member | Nonredeemable Preferred Stock [Member]	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	75,279	64,268
Fair Value Inputs Level 1 Member | Other equity securities	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	64,071	147,859
Fair Value Inputs Level 1 Member | Securities Pledged As Collateral Member	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	'	1,323
Fair Value Inputs Level 1 Member | Other	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	15,514	11,951
Fair Value Inputs Level 1 Member | Interest Rate Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Interest Rate Options	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	'
Fair Value Inputs Level 1 Member | Foreign Currency Forwards	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Equity Option	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	'
Fair Value Inputs Level 1 Member | Consumer Price Index Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 1 Member | Credit Default Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Foreign Currency Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	'
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 1 Member | Corporate securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	58,111	43,544
Fair Value Inputs Level 1 Member | Canadian and Canadian provincial governments	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Residential mortgage-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Asset-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Commercial Mortgage Backed Securities [Member]	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | US Treasury And Government Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	362,269	192,780
Fair Value Inputs Level 1 Member | State and political subdivisions	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 1 Member | Other foreign government, supranational and foreign government-sponsored enterprises	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	302,997	297,025
Fair Value Inputs Level 2 Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	18,284,520	19,520,344
Funds withheld at interest embedded derivatives	0	0
Cash and cash equivalents	0	0
Short-term investments	6,675	38,177
Other invested assets	90,156	194,460
Total Assets	18,381,351	19,752,981
Liabilities Fair Value Disclosure	'	'
Interest-sensitive contract liabilities - embedded derivatives	0	0
Total Liabilities	13,148	31,652
Fair Value Inputs Level 2 Member | Nonredeemable Preferred Stock [Member]	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	2,735	10,573
Fair Value Inputs Level 2 Member | Other equity securities	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Securities Pledged As Collateral Member	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	'	15,679
Fair Value Inputs Level 2 Member | Other	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 2 Member | Interest Rate Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	29,102	104,972
Liabilities Fair Value Disclosure	'	'
Other liabilities	2,286	196
Fair Value Inputs Level 2 Member | Interest Rate Options	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	5,699	'
Fair Value Inputs Level 2 Member | Foreign Currency Forwards	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	1,017
Liabilities Fair Value Disclosure	'	'
Other liabilities	8,928	2,105
Fair Value Inputs Level 2 Member | Equity Option	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	43,482	62,514
Liabilities Fair Value Disclosure	'	'
Other liabilities	-139	'
Fair Value Inputs Level 2 Member | Consumer Price Index Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	112	1,446
Fair Value Inputs Level 2 Member | Credit Default Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	1,764	-1,741
Liabilities Fair Value Disclosure	'	'
Other liabilities	-170	1,953
Fair Value Inputs Level 2 Member | Foreign Currency Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	7,262	'
Liabilities Fair Value Disclosure	'	'
Other liabilities	2,243	27,398
Fair Value Inputs Level 2 Member | Corporate securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	10,356,155	10,667,964
Fair Value Inputs Level 2 Member | Canadian and Canadian provincial governments	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	3,491,156	4,049,334
Fair Value Inputs Level 2 Member | Residential mortgage-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	818,567	948,133
Fair Value Inputs Level 2 Member | Asset-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	457,198	459,164
Fair Value Inputs Level 2 Member | Commercial Mortgage Backed Securities [Member]	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	1,328,173	1,531,897
Fair Value Inputs Level 2 Member | US Treasury And Government Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	65,156	67,872
Fair Value Inputs Level 2 Member | State and political subdivisions	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	253,688	259,286
Fair Value Inputs Level 2 Member | Other foreign government, supranational and foreign government-sponsored enterprises	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	1,514,427	1,536,694
Fair Value Inputs Level 3 Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	2,281,211	2,237,921
Funds withheld at interest embedded derivatives	-175,933	-243,177
Cash and cash equivalents	0	0
Short-term investments	0	22,031
Other invested assets	4,825	0
Total Assets	2,110,103	2,016,775
Liabilities Fair Value Disclosure	'	'
Interest-sensitive contract liabilities - embedded derivatives	825,899	912,361
Total Liabilities	825,899	912,361
Fair Value Inputs Level 3 Member | Nonredeemable Preferred Stock [Member]	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	4,825	0
Fair Value Inputs Level 3 Member | Other equity securities	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Securities Pledged As Collateral Member	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	'	0
Fair Value Inputs Level 3 Member | Other	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Interest Rate Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Interest Rate Options	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	'
Fair Value Inputs Level 3 Member | Foreign Currency Forwards	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Equity Option	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	'
Fair Value Inputs Level 3 Member | Consumer Price Index Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Fair Value Inputs Level 3 Member | Credit Default Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	0
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Foreign Currency Swaps	'	'
Assets Fair Value Disclosure	'	'
Other invested assets	0	'
Liabilities Fair Value Disclosure	'	'
Other liabilities	0	0
Fair Value Inputs Level 3 Member | Corporate securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	1,520,296	1,668,563
Fair Value Inputs Level 3 Member | Canadian and Canadian provincial governments	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	0	0
Fair Value Inputs Level 3 Member | Residential mortgage-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	133,271	93,931
Fair Value Inputs Level 3 Member | Asset-backed securities	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	428,080	232,391
Fair Value Inputs Level 3 Member | Commercial Mortgage Backed Securities [Member]	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	124,941	167,006
Fair Value Inputs Level 3 Member | US Treasury And Government Member	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	3,422	4,538
Fair Value Inputs Level 3 Member | State and political subdivisions	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	44,041	43,212
Fair Value Inputs Level 3 Member | Other foreign government, supranational and foreign government-sponsored enterprises	'	'
Assets Fair Value Disclosure	'	'
Fixed maturity securities, available-for-sale	$27,160	$28,280

Fair_Value_of_Assets_and_Liabi3

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Quantitative Information for Level 3 Inputs) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Discounted Cash Flow [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities	$760,746	$740,256
Interest-sensitive contract liabilities - embedded derivatives - variable annuities	65,153	172,105
Discounted Cash Flow [Member] | Mortality [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] | Mortality [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	100.00%	100.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	100.00%	100.00%
Discounted Cash Flow [Member] | Mortality [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	1.00%	1.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	2.00%	2.00%
Discounted Cash Flow [Member] | Lapse [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] | Lapse [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	35.00%	35.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	25.00%	25.00%
Discounted Cash Flow [Member] | Lapse [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	6.00%	6.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	5.00%	5.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	0.00%	0.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	5.00%	5.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	7.00%	7.00%
Discounted Cash Flow [Member] | Withdrawal [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	3.00%	3.00%
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	3.00%	3.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%	1.00%
Discounted Cash Flow [Member] | Own Credit [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	1.00%	1.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	2.00%	2.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	4.00%	4.00%
Discounted Cash Flow [Member] | Option Budget Projection [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - indexed annuities Unobservable Input Range	3.00%	3.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	0.00%	0.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	27.00%	27.00%
Discounted Cash Flow [Member] | Long Term Volatility [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Interest-sensitive contract liabilities - embedded derivatives - variable annuities Unobservable Input Range	13.00%	14.00%
Total Return Swap [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives	-175,933	-243,177
Total Return Swap [Member] | Mortality [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] | Mortality [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	100.00%	100.00%
Total Return Swap [Member] | Mortality [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] | Lapse [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] | Lapse [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	35.00%	35.00%
Total Return Swap [Member] | Lapse [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	6.00%	6.00%
Total Return Swap [Member] | Withdrawal [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] | Withdrawal [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	5.00%	5.00%
Total Return Swap [Member] | Withdrawal [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	3.00%	3.00%
Total Return Swap [Member] | Own Credit [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	0.00%	0.00%
Total Return Swap [Member] | Own Credit [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] | Own Credit [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	1.00%	1.00%
Total Return Swap [Member] | Crediting Rate [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	2.00%	2.00%
Total Return Swap [Member] | Crediting Rate [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	4.00%	4.00%
Total Return Swap [Member] | Crediting Rate [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
Funds withheld at interest - embedded derivatives Unobservable Input Range	3.00%	3.00%
Market Comparable Securities [Member] | Liquidity Premium [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
State And Political Subdivision Securities	5,032	5,451
Corporate Securities	366,372	450,177
Short-term Investments	'	$22,031
Market Comparable Securities [Member] | Liquidity Premium [Member] | Minimum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	0.00%	0.00%
Short Term Investments Unobservable Input Range	0.00%	1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Maximum [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	2.00%	2.00%
Short Term Investments Unobservable Input Range	0.00%	1.00%
Market Comparable Securities [Member] | Liquidity Premium [Member] | Weighted Average [Member]	'	'
Unobservable Inputs Used In Level 3 Fair Value Measurements [Line Items]	'	'
State And Political Subdivision Securities Unobservable Input Range	1.00%	1.00%
Corporate Securities Unobservable Input Range	1.00%	1.00%
Short Term Investments Unobservable Input Range	0.00%	1.00%

Fair_Value_of_Assets_and_Liabi4

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Transfers between Level 1 and Level 2) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	$0	$23,586	$0	$40,435
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	0	11,068	14,012	22,224
Available-for-sale Securities [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	0	13,940	0	30,789
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	0	0	14,012	11,156
Corporate securities | Available-for-sale Securities [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	0	11,777	0	14,773
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	0	0	14,012	4
US Treasury And Government Member | Available-for-sale Securities [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	'	'	0	0
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	'	'	0	11,152
State and political subdivisions | Available-for-sale Securities [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	'	'	0	12,794
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	'	'	0	0
Other foreign government, supranational and foreign government-sponsored enterprises | Available-for-sale Securities [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	0	2,163	0	3,222
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	0	0	0	0
Nonredeemable Preferred Stock [Member]	'	'	'	'
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]	'	'	'	'
Fair Value Assets, Level 1 to level 2 Transfers During Period, Amount	0	9,646	0	9,646
Fair Value Assets, Level 2 to Level 1 Transfers During Period, Amount	$0	$11,068	$0	$11,068

Fair_Value_of_Assets_and_Liabi5

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Changes in Level 3 Assets and Liabilities) (Details) (USD $)	3 Months Ended				9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013		Sep. 30, 2012		Sep. 30, 2013		Sep. 30, 2012
Funds Withheld At Interest Embedded Derivatives [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	($108,473)		($375,337)		($243,177)		($361,456)
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		0		0		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	-175,933		-320,501		-175,933		-320,501
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Funds Withheld At Interest Embedded Derivatives [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-67,460		54,836		67,244		40,955
Fair Value, Assets 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	-67,460		54,836		67,244		40,955
Funds Withheld At Interest Embedded Derivatives [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Funds Withheld At Interest Embedded Derivatives [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Funds Withheld At Interest Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Short-term Debt [Member]	'		'		'		'
Fair Value, Assets 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)	'		54		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	'		22,014	[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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	'		22,061		'		22,061
Short-term Debt [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		-7		'		'
Fair Value, Assets 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		'		'
Short-term Debt [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		'
Fair Value, Assets 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		'		'
Short-term Debt [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		'
Fair Value, Assets 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		'		'
Short-term Debt [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		'
Fair Value, Assets 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		'		'
Short-term Debt [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		'
Fair Value, Assets 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		'		'
Other Debt Securities Member	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	'		3,227		'		11,489
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	'		0		'		843
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	'		0	[1]	'		108	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	'		0	[1]	'		-3,788	[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		'		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	'		-3,227		'		-9,750
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	'		0		'		0
Other Debt Securities Member | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Other Debt Securities Member | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		-183
Fair Value, Assets 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		'		1,098
Other Debt Securities Member | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Other Debt Securities Member | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Other Debt Securities Member | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Nonredeemable Preferred Stock [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0		'		0		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	186		'		186		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[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	4,639		'		4,639		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		'		0		'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	4,825		'		4,825		'
Nonredeemable Preferred Stock [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Nonredeemable Preferred Stock [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Nonredeemable Preferred Stock [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Nonredeemable Preferred Stock [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Nonredeemable Preferred Stock [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Reinsurance Ceded Receivable Embedded Derivatives [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	'		4,416		'		4,945
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	'		0		'		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	'		0	[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	'		-100	[1]	'		-304	[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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	'		4,192		'		4,192
Reinsurance Ceded Receivable Embedded Derivatives [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Reinsurance Ceded Receivable Embedded Derivatives [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Reinsurance Ceded Receivable Embedded Derivatives [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Reinsurance Ceded Receivable Embedded Derivatives [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		0		'		0
Fair Value, Assets 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
Reinsurance Ceded Receivable Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		13		'		-33
Fair Value, Assets 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	'		-124		'		-449
Interest Sensitive Contract Liabilities Embedded Derivatives [Member]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	-878,568		-938,927		-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		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Purchases	-16,082	[1]	-8,502	[1]	-44,707	[1]	-48,199	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Sales	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Settlements	20,544	[1]	24,813	[1]	56,854	[1]	75,189	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers out of Level 3	0		0		0		0
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	-825,899		-953,804		-825,899		-953,804
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, 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		0
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	19,326		427		104,237		68,315
Fair Value, 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	19,829		2,579		106,952		74,025
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		-23		0		56
Fair Value, 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		213		0		770
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	7,834		-58,621		-89,491		-102,017
Fair Value, 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	28,378		-33,980		-32,637		-27,348
Interest Sensitive Contract Liabilities Embedded Derivatives [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Liabilities Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, 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		0
Short-term Investments [Member]	'		'		'		'
Fair Value, Assets 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 Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	'		'		-28		54
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, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	0		22,061		0		22,061
Short-term Investments [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		'		-4		-7
Fair Value, Assets 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	'		'		-3		-7
Short-term Investments [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		'		0		0
Fair Value, Assets 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
Short-term Investments [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		'		0		0
Fair Value, Assets 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
Short-term Investments [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		'		0		0
Fair Value, Assets 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
Short-term Investments [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	'		'		0		0
Fair Value, Assets 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
Available-for-sale Securities [Member] | Corporate securities	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	1,592,005		994,014		1,668,563		974,169
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	587		22,280		-36,123		31,940
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	80,644	[1]	556,031	[1]	256,006	[1]	645,466	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	-53,052	[1]	-18,548	[1]	-109,123	[1]	-45,833	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	-90,493	[1]	-31,448	[1]	-236,392	[1]	-84,819	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	2,760		1,293		10,906		18,738
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	-8,977		-10,444		-25,110		-25,311
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	1,520,296		1,507,273		1,520,296		1,507,273
Available-for-sale Securities [Member] | Corporate securities | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-2,096		-4,861		-6,313		-4,747
Fair Value, Assets 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	-2,254		-4,846		-6,594		-4,738
Available-for-sale Securities [Member] | Corporate securities | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		-223		-202		-1,329
Fair Value, Assets 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	-924		-1,059		-1,837		-2,339
Available-for-sale Securities [Member] | Corporate securities | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Corporate securities | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Corporate securities | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Residential mortgage-backed securities	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	140,054		49,591		93,931		81,655
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	122		479		-78		1,886
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	2,623	[1]	31,020	[1]	54,543	[1]	31,602	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	-1,116	[1]	-24,566	[1]	-3,733	[1]	-40,790	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	-8,017	[1]	-1,437	[1]	-20,307	[1]	-5,139	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		1,804		14,631		8,979
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		-7,459		-5,340		-29,024
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	133,271		49,359		133,271		49,359
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	24		28		17		283
Fair Value, Assets 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	24		114		18		413
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		-269
Fair Value, Assets 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	-419		-187		-394		-223
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Residential mortgage-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Asset-backed securities	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	352,606		128,358		232,391		193,492
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	370		7,658		15,007		16,135
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	91,675	[1]	62,109	[1]	220,098	[1]	64,121	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	-8,659	[1]	-3,725	[1]	-24,951	[1]	-11,627	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	-4,812	[1]	-4,407	[1]	-16,248	[1]	-11,510	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	0		5,006		8,305		6,086
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	-5,467		-5,460		-9,773		-67,094
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	428,080		189,590		428,080		189,590
Available-for-sale Securities [Member] | Asset-backed securities | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	2,314		40		4,711		440
Fair Value, Assets 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	2,314		54		4,719		497
Available-for-sale Securities [Member] | Asset-backed securities | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		-242		0		-849
Fair Value, Assets 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	53		-3		-1,468		-510
Available-for-sale Securities [Member] | Asset-backed securities | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Asset-backed securities | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Asset-backed securities | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	180,982		115,733		167,006		115,976
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	8,998		6,188		36,943		17,436
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	19,420	[1]	21,092	[1]	19,420	[1]	21,092	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	-81,253	[1]	0	[1]	-83,974	[1]	-1,552	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	-233	[1]	-511	[1]	-2,701	[1]	-568	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	3,425		26,208		3,425		37,054
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		0		0		-10,178
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	124,941		167,068		124,941		167,068
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	301		446		1,382		1,579
Fair Value, Assets 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	466		446		1,548		1,579
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-134		-2,088		-10,243		-14,163
Fair Value, Assets 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	-6,864		-2,088		-16,726		-13,771
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | US Treasury And Government Member	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	0		0		4,538		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	-40		-15		-40		-15
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	4,640	[1]	0	[1]	4,640	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	3,462		0		3,462		0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		0		-4,538		0
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	3,422		4,566		3,422		4,566
Available-for-sale Securities [Member] | US Treasury And Government Member | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		-59		0		-59
Fair Value, Assets 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		-59		0		-59
Available-for-sale Securities [Member] | US Treasury And Government Member | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | US Treasury And Government Member | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | US Treasury And Government Member | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | US Treasury And Government Member | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | State and political subdivisions	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	41,275		14,486		43,212		10,373
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	1,844		3,433		204		4,666
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales	0	[1]	0	[1]	0	[1]	0	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	-62	[1]	-116	[1]	-369	[1]	-162	[1]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3	979		29,150		979		37,588
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		0		0		-5,508
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	44,041		46,950		44,041		46,950
Available-for-sale Securities [Member] | State and political subdivisions | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	9		1		27		5
Fair Value, Assets 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	9		1		27		5
Available-for-sale Securities [Member] | State and political subdivisions | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		-4		-12		-12
Available-for-sale Securities [Member] | State and political subdivisions | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | State and political subdivisions | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | State and political subdivisions | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		0		0		0
Fair Value, Assets 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		0
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value	26,830		'		28,280		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	407		'		-893		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	0	[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		'		0		'
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3	0		'		0		'
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]	'		'		'		'
Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value	27,160		'		27,160		'
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Investment Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	-77		'		-227		'
Fair Value, Assets 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	-77		'		-227		'
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Investment Related Gains Losses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Insurance Claims [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Interest Income [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
Available-for-sale Securities [Member] | Other foreign government, supranational and foreign government-sponsored enterprises | Policy Acquisition Costs And Other Insurance Expenses [Member]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]	'		'		'		'
Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)	0		'		0		'
Fair Value, Assets 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		'
[1]	The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Fair_Value_of_Assets_and_Liabi6

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Fair Value Assets Measured on Non-Recurring Basis) (Details) (USD $)

3 Months Ended

9 Months Ended

In Thousands, unless otherwise specified

Sep. 30, 2013

Sep. 30, 2012

Sep. 30, 2013

Sep. 30, 2012

Jun. 30, 2013

Dec. 31, 2012

Jun. 30, 2012

Dec. 31, 2011

Mortgage Loans [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value Assets Carrying Value Prior To Impairment

$13,528

[1]

$25,092

[1]

$13,436

[1]

$27,836

[1]

'

'

'

'

Fair Value Assets Estimate Of Fair Value

13,575

[1]

23,467

[1]

13,575

[1]

23,467

[1]

'

'

'

'

Fair Value Assets Gains Losses

47

[1]

-1,625

[1]

139

[1]

-4,369

[1]

'

'

'

'

Limited Partnership Interest [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value Assets Carrying Value Prior To Impairment

'

'

11,590

[2]

25,191

[2]

'

'

'

'

Fair Value Assets Estimate Of Fair Value

'

'

9,161

[2]

16,944

[2]

'

'

'

'

Fair Value Assets Gains Losses

'

'

-2,429

[2]

-8,247

[2]

'

'

'

'

Real Estate Investment [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value Assets Carrying Value Prior To Impairment

0

[3]

23,012

[3]

4,736

[3]

0

[3]

'

'

'

'

Fair Value Assets Estimate Of Fair Value

0

[3]

15,558

[3]

4,136

[3]

0

[3]

'

'

'

'

Fair Value Assets Gains Losses

0

[3]

-7,454

[3]

-600

[3]

0

[3]

'

'

'

'

Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

0

0

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

186

'

186

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

0

[4]

'

0

[4]

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

0

[4]

'

0

[4]

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

0

[4]

'

0

[4]

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3

4,639

'

4,639

'

'

'

'

'

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

4,825

'

4,825

'

'

'

'

'

Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

'

22,031

'

0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

'

'

-28

54

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

'

'

0

[4]

22,014

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

'

'

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

'

'

-22,000

[4]

0

[4]

'

'

'

'

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

22,061

0

22,061

'

'

'

'

Other Debt Obligations [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

'

'

3,227

11,489

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

'

0

'

843

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

'

0

[4]

'

108

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

'

0

[4]

'

-3,788

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

'

0

[4]

'

0

[4]

'

'

'

'

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

'

-3,227

'

-9,750

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

'

0

'

0

'

'

'

'

Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

-108,473

-243,177

-375,337

-361,456

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

0

0

0

0

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

0

[4]

0

[4]

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

0

[4]

0

[4]

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

0

[4]

0

[4]

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3

0

0

0

0

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3

0

0

0

0

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

-175,933

-320,501

-175,933

-320,501

'

'

'

'

Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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)

'

54

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

'

22,014

[4]

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

'

0

[4]

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

'

0

[4]

'

'

'

'

'

'

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

'

22,061

'

22,061

'

'

'

'

Investment Related Gains Losses [Member] | Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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 And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

'

0

'

1,098

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

'

0

'

-183

'

'

'

'

Investment Related Gains Losses [Member] | Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

-67,460

54,836

67,244

40,955

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

-67,460

54,836

67,244

40,955

'

'

'

'

Investment Related Gains Losses [Member] | Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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 And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Insurance Claims [Member] | Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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 And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Interest Income [Member] | Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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 And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Policy Acquisition Costs And Other Insurance Expenses [Member] | Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Nonredeemable Preferred Stock [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Short-term Investments [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

'

'

-3

-7

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

'

'

-4

-7

'

'

'

'

Investment Income [Member] | Other Debt Obligations [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

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] | Funds Withheld At Interest Embedded Derivatives [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Investment Income [Member] | Short-term Debt [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

'

-7

'

'

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

'

-7

'

'

'

'

'

'

Available-for-sale Securities [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

180,982

167,006

115,733

115,976

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

8,998

6,188

36,943

17,436

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

19,420

[4]

21,092

[4]

19,420

[4]

21,092

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

-81,253

[4]

0

[4]

-83,974

[4]

-1,552

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

-233

[4]

-511

[4]

-2,701

[4]

-568

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3

3,425

26,208

3,425

37,054

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3

0

0

0

-10,178

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

124,941

167,068

124,941

167,068

'

'

'

'

Available-for-sale Securities [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Value

'

'

'

'

0

4,538

0

0

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)

-40

-15

-40

-15

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases

0

[4]

4,640

[4]

0

[4]

4,640

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Sales

0

[4]

0

[4]

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements

0

[4]

0

[4]

0

[4]

0

[4]

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Into Level 3

3,462

0

3,462

0

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3

0

0

-4,538

0

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliations, Recurring Basis, Liability Value

3,422

4,566

3,422

4,566

'

'

'

'

Available-for-sale Securities [Member] | Investment Related Gains Losses [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

-6,864

-2,088

-16,726

-13,771

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

-134

-2,088

-10,243

-14,163

'

'

'

'

Available-for-sale Securities [Member] | Investment Related Gains Losses [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Insurance Claims [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Insurance Claims [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Interest Income [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Interest Income [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Policy Acquisition Costs And Other Insurance Expenses [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

0

0

0

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

0

0

0

0

'

'

'

'

Available-for-sale Securities [Member] | Investment Income [Member] | Commercial Mortgage Backed Securities [Member]

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

466

446

1,548

1,579

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

301

446

1,382

1,579

'

'

'

'

Available-for-sale Securities [Member] | Investment Income [Member] | US Treasury And Government Member

'

'

'

'

'

'

'

'

Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis [Line Items]

'

'

'

'

'

'

'

'

Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings

0

-59

0

-59

'

'

'

'

Fair Value, Assets Measured on Recurring Basis, Change in Unrealized Gain (Loss)

$0

($59)

$0

($59)

'

'

'

'

[1]

Mortgage loans — The impaired mortgage loans presented above were written down to their estimated fair values at the date the impairments were recognized and are reported as losses above. Subsequent improvements in estimated fair value on previously impaired loans recorded through a reduction in the previously established valuation allowance are reported as gains above. Nonrecurring fair value adjustments on mortgage loans are based on the fair value of underlying collateral or discounted cash flows.

[2]

Limited partnership interests — The impaired investments presented above were accounted for using the cost method. Impairments on these cost method investments were recognized at estimated fair value determined using the net asset values of the Company’s ownership interest as provided in the financial statements of the investees. The market for these investments has limited activity and price transparency.

[3]

Real estate investment - The impaired real estate investments presented above were written down to their estimated fair value at the date of impairment and are reported as losses above. The impairments were based on third-party appraisal values obtained and reviewed by the Company.

[4]

The amount reported within purchases, sales and settlements is the purchase price (for purchases) and the sales/settlement proceeds (for sales and settlements) based upon the actual date purchased or sold/settled. Items purchased and sold/settled in the same period are excluded from the rollforward. The Company had no issuances during the period.

Fair_Value_of_Assets_and_Liabi7

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Financial Instruments where Carrying Amounts and Fair Values May Differ) (Details) (USD $)	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	$2,488,582		$2,300,587		'	'
Policy loans	1,244,878		1,278,175		'	'
Funds withheld at interest	5,739,872		5,594,182		'	'
Cash and cash equivalents	1,423,235		1,259,892		1,603,730	962,870
Short-term investments	44,192		288,082		'	'
Other invested assets	1,116,391		1,159,543		'	'
Accrued investment income	262,330		201,344		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	12,868,425		13,353,502		'	'
Collateral finance facility	484,712		652,010		'	'
Carrying Value [Member]	'		'		'	'
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	2,488,582		2,300,587		'	'
Policy loans	1,244,878		1,278,175		'	'
Funds withheld at interest	5,917,002	[1]	5,837,359	[1]	'	'
Cash and cash equivalents	751,236	[2]	684,028	[2]	'	'
Short-term investments	24,756	[2]	48,951	[2]	'	'
Other invested assets	652,759	[2]	596,336	[2]	'	'
Accrued investment income	262,330		201,344		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	11,104,386	[1]	11,566,962	[1]	'	'
Long And Short Term Debt	2,214,170		1,815,253		'	'
Collateral finance facility	484,712		652,010		'	'
Estimate of Fair Value Measurement [Member]	'		'		'	'
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	2,515,250		2,426,688		'	'
Policy loans	1,244,878		1,278,175		'	'
Funds withheld at interest	6,144,891	[1]	6,362,324	[1]	'	'
Cash and cash equivalents	751,236	[2]	684,028	[2]	'	'
Short-term investments	24,756	[2]	48,951	[2]	'	'
Other invested assets	694,909	[2]	626,358	[2]	'	'
Accrued investment income	262,330		201,344		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	10,923,043	[1]	11,926,339	[1]	'	'
Long And Short Term Debt	2,348,049		2,014,062		'	'
Collateral finance facility	365,307		456,050		'	'
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 1 Member	'		'		'	'
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	0		0		'	'
Policy loans	0		0		'	'
Funds withheld at interest	0	[1]	0	[1]	'	'
Cash and cash equivalents	751,236	[2]	684,028	[2]	'	'
Short-term investments	24,756	[2]	48,951	[2]	'	'
Other invested assets	4,956	[2]	0	[2]	'	'
Accrued investment income	0		0		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	0	[1]	0	[1]	'	'
Long And Short Term Debt	0		0		'	'
Collateral finance facility	0		0		'	'
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 2 Member	'		'		'	'
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	0		0		'	'
Policy loans	1,244,878		1,278,175		'	'
Funds withheld at interest	0	[1]	0	[1]	'	'
Cash and cash equivalents	0	[2]	0	[2]	'	'
Short-term investments	0	[2]	0	[2]	'	'
Other invested assets	31,436	[2]	32,250	[2]	'	'
Accrued investment income	262,330		201,344		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	0	[1]	0	[1]	'	'
Long And Short Term Debt	0		0		'	'
Collateral finance facility	0		0		'	'
Estimate of Fair Value Measurement [Member] | Fair Value Inputs Level 3 Member	'		'		'	'
Assets	'		'		'	'
Mortgage loans on real estate (net of valuation allowances)	2,515,250		2,426,688		'	'
Policy loans	0		0		'	'
Funds withheld at interest	6,144,891	[1]	6,362,324	[1]	'	'
Cash and cash equivalents	0	[2]	0	[2]	'	'
Short-term investments	0	[2]	0	[2]	'	'
Other invested assets	658,517	[2]	594,108	[2]	'	'
Accrued investment income	0		0		'	'
Liabilities	'		'		'	'
Interest-sensitive contract liabilities	10,923,043	[1]	11,926,339	[1]	'	'
Long And Short Term Debt	2,348,049		2,014,062		'	'
Collateral finance facility	$365,307		$456,050		'	'
[1]	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are embedded derivatives and are measured at fair value on a recurring basis.
[2]	Carrying values presented herein differ from those presented in the condensed consolidated balance sheets because certain items within the respective financial statement caption are measured at fair value on a recurring basis.

Fair_Value_of_Assets_and_Liabi8

Fair Value of Assets and Liabilities Fair Value of Assets and Liabilities (Narrative) (Details)	Sep. 30, 2013	Dec. 31, 2012
Fair Value Disclosures [Abstract]	'	'
Percentage Of Fixed Maturity Securities Classified As Level 3	10.70%	10.00%

Segment_Information_Total_Reve

Segment Information (Total Revenues of Reportable Segments) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	$2,389,815	$2,449,081	$7,581,559	$7,117,809
US Segment Reporting Information [Member]	'	'	'	'
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	1,337,562	1,446,834	4,402,212	4,141,202
Canada Segment Reporting Information [Member]	'	'	'	'
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	292,504	287,629	884,918	839,491
Europe And South Africa Segment Reporting Information [Member]	'	'	'	'
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	358,796	323,225	1,036,935	955,505
Asia Pacific Segment Reporting Information [Member]	'	'	'	'
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	376,929	364,516	1,134,071	1,101,934
Corporate And Other Segment Reporting Information [Member]	'	'	'	'
Segment Total Revenue [Line Items]	'	'	'	'
Total revenues	$24,024	$26,877	$123,423	$79,677

Segment_Information_Income_Los

Segment Information (Income Loss Before Provision for Income Tax of Reportable Segments) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	$201,695	$201,479	$405,764	$598,134
US Segment Reporting Information [Member]	'	'	'	'
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	105,867	156,678	450,719	390,009
Canada Segment Reporting Information [Member]	'	'	'	'
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	41,869	37,520	113,836	127,613
Europe And South Africa Segment Reporting Information [Member]	'	'	'	'
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	41,553	32,166	74,756	58,363
Asia Pacific Segment Reporting Information [Member]	'	'	'	'
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	17,112	-16,483	-258,818	39,443
Corporate And Other Segment Reporting Information [Member]	'	'	'	'
Segment Income Loss From Continuing Operations Before Provision For Income Tax [Line Items]	'	'	'	'
Income Loss From Continuing Operations Before Provision For Income Tax Segment	($4,706)	($8,402)	$25,271	($17,294)

Segment_Information_Total_Asse

Segment Information (Total Assets of Reportable Segments) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Segment Total Assets [Line Items]	'	'
Total assets	$39,526,555	$40,360,438
US Segment Reporting Information [Member]	'	'
Segment Total Assets [Line Items]	'	'
Total assets	24,601,693	24,924,363
Canada Segment Reporting Information [Member]	'	'
Segment Total Assets [Line Items]	'	'
Total assets	4,065,475	3,764,002
Europe And South Africa Segment Reporting Information [Member]	'	'
Segment Total Assets [Line Items]	'	'
Total assets	2,403,094	2,235,199
Asia Pacific Segment Reporting Information [Member]	'	'
Segment Total Assets [Line Items]	'	'
Total assets	3,396,639	3,208,732
Corporate And Other Segment Reporting Information [Member]	'	'
Segment Total Assets [Line Items]	'	'
Total assets	$5,059,654	$6,228,142

Commitments_and_Contingent_Lia2

Commitments and Contingent Liabilities (Credit Facility) (Details) (USD $)	9 Months Ended		12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012
Credit Facility One Hundred Fifty Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	$151.40		'
Maturity Date	'March 2019		'
Amount Utilized	151.4	[1]	0	[1]
Basis Of Fees	'Fixed		'
Credit Facility One Hundred Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	100		'
Maturity Date	'June 2017		'
Amount Utilized	92.2	[1]	0	[1]
Basis Of Fees	'Fixed		'
Credit Facility Fifty Three Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	52.9		'
Maturity Date	'November 2013		'
Amount Utilized	52.9	[1]	0	[1]
Basis Of Fees	'Fixed		'
Credit Facility 270 Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	270		'
Maturity Date	'November 2017		'
Amount Utilized	270	[1]	0	[1]
Basis Of Fees	'Fixed		'
Credit Facility 120 Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	120		'
Maturity Date	'May 2016		'
Amount Utilized	115	[1]	100	[1]
Basis Of Fees	'Fixed		'
Credit Facility 200 Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	200		'
Maturity Date	'September 2019		'
Amount Utilized	200	[1]	200	[1]
Basis Of Fees	'Fixed		'
Credit Facility 850 Million [Member]	'		'
Line Of Credit Facility [Line Items]	'		'
Facility Capacity	850		'
Maturity Date	'December 2015		'
Amount Utilized	$73.90	[1]	$402.90	[1]
Basis Of Fees	'Senior unsecured long-term debt rating		'
[1]	Represents issued but undrawn letters of credit. There was no cash borrowed for the periods presented.

Commitments_and_Contingent_Lia3

Commitments and Contingent Liabilities (Commitments and Guarantees) (Details) (USD $)	Sep. 30, 2013	Dec. 31, 2012
In Millions, unless otherwise specified	credit_facilities
Commitments And Contingent Liabilities [Line Items]	'	'
Undrawn outstanding letters of credit in favor of third parties	$223.70	$45.40
Undrawn outstanding letters of credit between subsidiaries	916.5	763.5
Number of credit facilities	7	'
Syndicated revolving credit facility capacity	850	'
Insurance Treaty Guarantee [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	860.6	686
Insurance Treaty Guarantee Net Of Assets Held In Trust [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	669.9	463.5
Guarantee Of Borrowed Securities [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	87.5	'
Guarantee Of Subsidiary Collateral Financing [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Guarantor Obligations, Current Carrying Value	300	'
Letter of Credit [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Number of credit facilities	6	'
Facility Capacity	894.3	'
Commitment Period 2033 [Member] | Statutory Reserve Support Guarantee [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Maximum potential obligation, Undiscounted	1,350	'
Commitment Period 2035 [Member] | Statutory Reserve Support Guarantee [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Maximum potential obligation, Undiscounted	560	'
Limited Partnerships [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	241.9	176.7
Commercial Mortgage Loans [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	23.1	22.2
Bank Loans [Member]	'	'
Commitments And Contingent Liabilities [Line Items]	'	'
Unfunded commitments to fund partnership investments, mortgage loans and private corporate bond investments	$58.20	$68.50

Employee_Benefit_Plans_Defined

Employee Benefit Plans (Defined Benefit Plans Disclosure) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012
Pension Benefits	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	$2,000	$1,910	$6,012	$5,638
Interest cost	1,017	1,065	3,055	3,135
Expected return on plan assets	-933	-766	-2,800	-2,299
Amortization of prior service cost	152	102	459	288
Amortization of prior actuarial loss	808	851	2,427	2,514
Total	3,044	3,162	9,153	9,276
Other Benefits	'	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'	'
Service cost	590	673	1,411	1,231
Interest cost	392	418	1,015	935
Expected return on plan assets	0	0	0	0
Amortization of prior service cost	0	0	0	0
Amortization of prior actuarial loss	279	380	651	557
Total	$1,261	$1,471	$3,077	$2,723

Employee_Benefit_Plans_Narrati

Employee Benefit Plans (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013
Compensation and Retirement Disclosure [Abstract]	'
Defined Benefit Plan, Contributions by Employer	$6,800,000
Defined Benefit Plan, Estimated Future Employer Contributions in Current Fiscal Year	$0

Equity_Based_Compensation_Narr

Equity Based Compensation (Narrative) (Details) (USD $)	9 Months Ended
In Millions, except Share data, unless otherwise specified	Sep. 30, 2013	Sep. 30, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]	'	'
Equity compensation expense	$5.50	$3.70
Stock appreciation rights granted	700,000	'
Stock appreciation rights granted, weighted average exercise price (per share)	$58.77	'
Performance contingent units	300,000	'
Shares Granted To Non Employee Directors	14,200	'
Options exercisable (shares)	1,700,000	'
Options exercisable, weighted average price (per share)	$50.57	'
Options, remaining term	'4 years 11 months 6 days	'
Compensation cost not yet recognized	$32.70	'
Period for recognition	'2 years 1 month 12 days	'

Retrocession_Arrangements_and_1

Retrocession Arrangements and Reinsurance Ceded Receivables (Narrative) (Details) (USD $)	9 Months Ended	12 Months Ended
In Millions, unless otherwise specified	Sep. 30, 2013	Dec. 31, 2012
Retrocession Arrangements And Reinsurance Ceded Receivables [Abstract]	'	'
Retrocession Pool Participants Minimum AM Best Rating	'A- (excellent)	'A- (excellent)
Reinsurance Claims Recoverables	$132.40	$156
Claims Recoverable From Retrocessionaires Past Due	$6.50	$10.40

Financing_and_Other_Activities1

Financing and Other Activities (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended
	Mar. 31, 2013	Sep. 30, 2013	Sep. 30, 2012
Repurchase Of Collateral Finance Facility Notes [Abstract]	'	'	'
Debt Instrument Repurchased Face Amount	$160,000,000	'	'
Repayments of Long-term Debt	112,000,000	'	'
Gains Losses On Extinguishment Of Collateral Finance Securities	46,500,000	'	'
Payments to Acquire Businesses, Net of Cash Acquired	'	12,500,000	'
Noncash or Part Noncash Acquisition, Value of Assets Acquired	'	147,300,000	'
Noncash or Part Noncash Acquisition, Value of Liabilities Assumed	'	134,800,000	'
Debt Instrument, Issuance Date	'	19-Sep-13	'
Debt Instrument, Interest Rate, Stated Percentage	'	4.70%	'
Debt Instrument, Maturity Date	'	15-Sep-23	'
Debt Instrument, Face Amount	'	400,000,000	'
Proceeds from Issuance of Long-term Debt and Capital Securities, Net	'	395,100,000	'
Payments of Debt Issuance Costs	'	$3,400,000	$6,255,000

Stock_Transactions_Stock_Trans

Stock Transactions Stock Transactions (Narrative) (Details) (USD $)	9 Months Ended	1 Months Ended			9 Months Ended	0 Months Ended
	Sep. 30, 2013	Jan. 24, 2013	Apr. 18, 2013	Apr. 30, 2013	Sep. 30, 2013	Jul. 18, 2013	Jul. 18, 2013
		January 2013 Share Repurchase Authorization [Member]	April 2013 Share Repurchase Authorization [Member]	April 2013 Share Repurchase Authorization [Member]	July 2013 Share Repurchase Authorization	Subsequent Event	Subsequent Event
							July 2013 Share Repurchase Authorization
Equity, Class of Treasury Stock [Line Items]	'	'	'	'	'	'	'
Treasury Stock, Shares, Acquired	'	815,011	'	2,865,132	471,169	'	'
Treasury Stock, Value, Acquired, Cost Method	'	$47,600,000	'	$182,900,000	$30,800,000	'	'
Stock Repurchase Program, Authorized Amount	'	200,000,000	100,000,000	'	'	400,000,000	100,000,000
Stock Repurchase Program, Remaining Authorized Repurchase Amount	$138,700,000	'	'	'	'	'	'

New_Accounting_Standards_Narra

New Accounting Standards (Narrative) (Details) (Accounting Standards Update 2010-26 [Member], Restatement Adjustment [Member], USD $)	Dec. 31, 2011
In Millions, unless otherwise specified
Accounting Standards Update 2010-26 [Member] | Restatement Adjustment [Member]	'
New Accounting Pronouncements or Change in Accounting Principle [Line Items]	'
Cumulative effect decrease to total stockholders' equity	($318.40)
Cumulative effect decrease to deferred policy acquisition costs balance	($470.10)