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Investments (Tables)

12 Months Ended

Dec. 31, 2012

Investments [Abstract]

Available-for-sale Securities [Table Text Block]

																		Other-than-
																		temporary
December 31, 2012:			Amortized			Unrealized			Unrealized			Estimated			% of			impairments
			Cost			Gains			Losses			Fair 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		100.0	%		$	(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		100.0	%

																		Other-than-
																		temporary
December 31, 2011:			Amortized			Unrealized			Unrealized			Estimated			% of			impairments
			Cost			Gains			Losses			Fair Value			Total			in AOCI
Available-for-sale:
	Corporate securities		$	6,931,958		$	654,519		$	125,371		$	7,461,106		46.0	%		$	--
	Canadian and Canadian provincial
		governments		2,507,802			1,362,160			29			3,869,933		23.9				--
	Residential mortgage-backed securities			1,167,265			76,393			16,424			1,227,234		7.6				(1,042)
	Asset-backed securities			443,974			11,692			53,675			401,991		2.5				(5,256)
	Commercial mortgage-backed securities			1,233,958			87,750			79,489			1,242,219		7.7				(12,225)
	U.S. government and agencies			341,087			32,976			61			374,002		2.3				--
	State and political subdivisions			184,308			24,419			3,341			205,386		1.3				--
	Other foreign government, supranational and
		foreign government-sponsored enterprises		1,372,528			50,127			3,576			1,419,079		8.7				--
		Total fixed maturity securities	$	14,182,880		$	2,300,036		$	281,966		$	16,200,950		100.0	%		$	(18,523)
Non-redeemable preferred stock			$	82,488		$	4,677		$	8,982		$	78,183		68.6	%
Other equity securities				35,352			1,903			1,538			35,717		31.4
		Total equity securities	$	117,840		$	6,580		$	10,520		$	113,900		100.0	%

Investments Classified By Contractual Maturity Date [Table Text Block]

			Amortized			Fair
			Cost			Value
Available-for-sale:
	Due in one year or less		$	294,720		$	299,389
	Due after one year through five years			3,785,992			3,983,272
	Due after five year through ten years			6,592,768			7,198,997
	Due after ten years			5,607,854			7,377,434
	Asset and mortgage-backed securities			3,278,098			3,432,522
		Total	$	19,559,432		$	22,291,614

Fixed Maturity Holdings Industry Types [Table Text Block]

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		52.0
Utility			1,799,658			2,002,611		16.2
Other			32,351			33,462		0.3
	Total	$	11,333,431		$	12,380,071		100.0	%
December 31, 2011:						Estimated
			Amortized Cost			Fair Value		% of Total
Finance		$	2,411,175		$	2,442,149		32.7	%
Industrial			3,402,099			3,760,187		50.4
Utility			1,115,384			1,255,090		16.9
Other			3,300			3,680		--
	Total	$	6,931,958		$	7,461,106		100.0	%

Roll Forward Of Cumulative Credit Loss Component Of Otti Income Loss [Table Text Block]

	2012			2011			2010
Balance, beginning of period	$	63,947		$	47,291		$	47,905
Initial impairments - credit loss OTTI recognized on securities not previously impaired		1,962			8,349			7,359
Additional impairments - credit loss OTTI recognized on securities previously impaired		10,186			9,059			9,346
Credit loss OTTI previously recognized on securities impaired to fair value during the period		(22,290)			--			--
Credit loss previously recognized on securities which matured, paid down, prepaid or were sold during the period		(37,130)			(752)			(17,319)
Balance, end of period	$	16,675		$	63,947		$	47,291

AccountingForCertainLoansAndDebtSecuritiesAcquiredInTransferDisclosureTextBlock

		December 31, 2012
Outstanding principal and interest balance(1)		$	108,831
Carrying value, including accrued interest(2)		$	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]

		At Date of
		Acquisition
Contractually required payments (including interest)		$	152,988
Cash flows expected to be collected(1)		$	125,449
Fair value of investments acquired		$	85,298
(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]

	Year ended
	December 31, 2012
Balance, beginning of period	$	--
Investments purchased		40,151
Accretion		(1,388)
Disposals		--
Reclassification from nonaccretable difference		476
Balance, end of period	$	39,239

Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures [Table Text Block]

		December 31, 2012						December 31, 2011
		Gross						Gross
		Unrealized						Unrealized
		Losses			% of Total			Losses			% of Total
Less than 20%		$	54,951		41.2	%		$	131,155		44.8	%
20% or more for less than six months			734		0.5				51,503		17.6
20% or more for six months or greater			77,873		58.3				109,828		37.6
	Total	$	133,558		100.0	%		$	292,486		100.0	%

Fair Value And Investments In Debt And Equity Securities Disclosures [Table Text Block]

			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

			Less than 12 months						12 months or greater						Total
						Gross						Gross						Gross
December 31, 2011:			Estimated			Unrealized			Estimated			Unrealized			Estimated			Unrealized
			Fair Value			Losses			Fair Value			Losses			Fair Value			Losses
Investment grade securities:
	Corporate securities		$	790,758		$	40,180		$	286,244		$	63,117		$	1,077,002		$	103,297
	Canadian and Canadian provincial
		governments		3,094			29			--			--			3,094			29
	Residential mortgage-backed securities			128,622			3,549			58,388			10,382			187,010			13,931
	Asset-backed securities			101,263			3,592			93,910			29,036			195,173			32,628
	Commercial mortgage-backed securities			109,455			3,538			58,979			22,001			168,434			25,539
	U.S. government and agencies			1,764			61			--			--			1,764			61
	State and political subdivisions			21,045			1,845			12,273			1,268			33,318			3,113
	Other foreign government, supranational and
		foreign government-sponsored enterprises		148,416			1,085			16,588			2,491			165,004			3,576
		Total investment grade securities		1,304,417			53,879			526,382			128,295			1,830,799			182,174
Non-investment grade securities:
	Corporate securities			212,795			10,852			47,310			11,222			260,105			22,074
	Residential mortgage-backed securities			23,199			712			10,459			1,781			33,658			2,493
	Asset-backed securities			2,363			940			21,275			20,107			23,638			21,047
	Commercial mortgage-backed securities			34,918			7,220			62,357			46,730			97,275			53,950
	State and political subdivisions			4,000			228			--			--			4,000			228
		Total non-investment grade securities		277,275			19,952			141,401			79,840			418,676			99,792
		Total fixed maturity securities	$	1,581,692		$	73,831		$	667,783		$	208,135		$	2,249,475		$	281,966
	Non-redeemable preferred stock		$	19,516		$	4,478		$	15,694		$	4,504		$	35,210		$	8,982
	Other equity securities			1,662			602			5,905			936			7,567			1,538
		Total equity securities	$	21,178		$	5,080		$	21,599		$	5,440		$	42,777		$	10,520

Investment Income [Table Text Block]

Investment Income, Net of Related Expenses
Major categories of investment income, net of related expenses consist of the following (dollars in thousands):
	2012			2011			2010
Fixed maturity securities available-for-sale	$	868,682		$	757,726		$	715,817
Mortgage loans on real estate		96,901			55,931			51,186
Policy loans		62,855			66,621			72,743
Funds withheld at interest		393,586			388,694			385,762
Short-term investments		4,173			2,378			4,968
Other invested assets		49,199			39,939			33,187
Investment income		1,475,396			1,311,289			1,263,663
Investment expense		(39,190)			(30,092)			(25,003)
Investment income, net of related expenses	$	1,436,206		$	1,281,197		$	1,238,660

Gain (Loss) on Investments [Table Text Block]

Investment Related Gains (Losses), Net
Investment related gains (losses), net, consist of the following (dollars in thousands):
				2012			2011			2010
Fixed maturity and equity securities available for sale:
	Other-than-temporary impairment losses on fixed maturities			$	(15,908)		$	(30,873)		$	(31,920)
	Portion of loss recognized in accumulated other
		comprehensive income (before taxes)			(7,618)			3,924			2,045
	Net other-than-temporary impairment losses on fixed
		maturity securities recognized in earnings			(23,526)			(26,949)			(29,875)
	Impairment losses on equity securities				(3,025)			(4,116)			(32)
	Gain on investment activity				145,268			132,045			100,957
	Loss on investment activity				(27,474)			(26,996)			(28,730)
Other impairment losses (primarily mortgage loans and limited partnerships)					(16,602)			(10,238)			(5,976)
Derivatives and other, net					179,495			(99,802)			175,686
Total investment related gains (losses), net				$	254,136		$	(36,056)		$	212,030

Disclosure Of Real Estate Holdings By Property Type [Table Text Block]

			2012						2011
			Recorded Investment			Percentage of Total			Recorded Investment			Percentage of Total
Property type:
	Apartment		$	229,266		9.9	%		$	124,674		12.4	%
	Retail			669,958		29.0				335,745		33.5
	Office building			825,406		35.7				264,584		26.4
	Industrial			455,682		19.7				200,762		20.0
	Other commercial			131,855		5.7				77,759		7.7
Total			$	2,312,167		100.0	%		$	1,003,524		100.0	%

Disclosure Of Real Estate Holdings By Geographical Region [Table Text Block]

			2012						2011
			Recorded Investment			Percentage of Total			Recorded Investment			Percentage of Total
Pacific					$			593,589						25.7	%		$	269,922		26.9	%
South Atlantic				477,068		20.5				233,534		23.3
Mountain				233,174		10.1				116,224		11.6
Middle Atlantic				300,475		13.0				86,590		8.6
West North Central				168,063		7.3				69,789		7.0
East North Central				224,122		9.7				92,861		9.2
West South Central				161,451		7.0				58,506		5.8
East South Central				62,789		2.7				40,767		4.1
New England				91,436		4.0				35,331		3.5
	Total		$	2,312,167		100.0	%		$	1,003,524		100.0	%

Disclosure of Real Estate Holdings Classified By Contractual Maturity Date [Table Text Block]

The maturities of the mortgage loans, gross of valuation allowances, as of December 31, 2012 and 2011 are as follows (dollars in thousands):
														2012			2011
Due one year through five years			$	1,187,387		$	493,027
Due after five years				776,655			299,252
Due after ten years				348,125			211,245
		Total	$	2,312,167		$	1,003,524

Mortgage Loan Internal Credit Risk Grade [Table Text Block]

Internal credit quality grade:			2012			2011
	High investment grade		$	1,235,605		$	252,333
	Investment grade			834,494			526,608
	Average			132,607			105,177
	Watch list			76,463			91,037
	In or near default			32,998			28,369
		Total	$	2,312,167		$	1,003,524

Schedule Of Analysis Of Past Due Financing Receivables [Table Text Block]

The age analysis of the Company's past due recorded investment in mortgage loans, gross of valuation allowances, as of December 31, 2012 and 2011 are as follows (dollars in thousands):
														2012			2011
31-60 days past due			$	7,504		$	21,800
61-90 days past due				--			--
Greater than 90 days				16,886			20,316
	Total past due			24,390			42,116
Current				2,287,777			961,408
		Total	$	2,312,167		$	1,003,524

Recorded Investment And Allowance For Credit Losses [Table Text Block]

The following table presents the recorded investment in mortgage loans, by method of evaluation of credit loss, and the related valuation allowances, by type of credit loss, at (dollars in thousands):
			December 31,
			2012			2011
Mortgage loans:
	Evaluated individually for credit losses		$	39,956		$	60,904
	Evaluated collectively for credit losses			2,272,211			942,620
		Mortgage loans, gross of valuation allowances		2,312,167			1,003,524
Valuation allowances:
	Specific for credit losses			6,980			8,188
	Non-specifically identified credit losses			4,600			3,605
		Total valuation allowances		11,580			11,793
		Mortgage loans, net of valuation allowances	$	2,300,587		$	991,731

Allowance For Loan And Lease Losses Provision For Loss Net [Table Text Block]

Information regarding the Company's loan valuation allowances for mortgage loans as of December 31, 2012, 2011 and 2010 are as follows (dollars in thousands):
															2012			2011			2010
Balance, beginning of period			$	11,793		$	6,239		$	5,784
Charge-offs				(6,474)			(3,947)			--
Provision				6,261			9,501			455
Balance, end of period			$	11,580		$	11,793		$	6,239

Impaired Financing Receivables [Table Text Block]

		Unpaid Principal Balance			Recorded Investment			Related Allowance			Carrying Value
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
December 31, 2011:
Impaired mortgage loans with no valuation allowance recorded		$	32,088		$	31,496		$	--		$	31,496
Impaired mortgage loans with valuation allowance recorded			29,724			29,408			8,188			21,220
	Total impaired mortgage loans	$	61,812		$	60,904		$	8,188		$	52,716

The Company's average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the years ended December 31, 2012, 2011 and 2010 (dollars in thousands):
																					2012						2011						2010
		Average Investment(1)			Interest Income			Average Investment(1)			Interest Income			Average Investment(1)			Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	15,549		$	1,244		$	14,877		$	630		$	19,253		$	525
Impaired mortgage loans with valuation allowance recorded			34,434			425			27,712			418			21,925			295
	Total	$	49,983		$	1,669		$	42,589		$	1,048		$	41,178		$	820
(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]

			December 31,
			2012			2011
Equity securities			$	222,700		$	113,900
Limited partnerships and real estate joint ventures				356,419			251,315
Structured loans				306,497			281,022
Derivatives				168,208			257,050
Other				105,719			109,254
	Total other invested assets		$	1,159,543		$	1,012,541

InvestmentTableTextBlock

				Amortized Cost/			Estimated Fair Value
				Recorded Investment			at Date of Transfer
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

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- Definition

A table of investments, shown as a text block.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Article 12

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This table presents information on how the Company diversifies its real estate holdings by geographical location within the United States of America to reduce the risk of concentration.

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Investments classified by contractual maturity date.

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