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Investments (Tables)

12 Months Ended

Dec. 31, 2014

Investments [Abstract]

Available-for-sale Securities [Table Text Block]

The following tables provide information relating to investments in fixed maturity and equity securities by sector as of December 31, 2014 and 2013 (dollars in thousands):

December 31, 2014:		Amortized Cost				Unrealized Gains				Unrealized Losses				Estimated Fair Value				% of Total			Other-than- temporary impairments in AOCI
Available-for-sale:
Corporate securities		$	14,010,604			$	965,523			$	90,544			$	14,885,583			58.4	%		$	—
Canadian and Canadian provincial governments		2,668,852				1,196,420				7				3,865,265				15.2			—
Residential mortgage-backed securities		991,867				52,640				6,611				1,037,896				4.1			(300		)
Asset-backed securities		1,059,660				20,301				10,375				1,069,586				4.2			354
Commercial mortgage-backed securities		1,453,657				87,593				8,659				1,532,591				6.0			(1,609		)
U.S. government and agencies		501,352				25,014				515				525,851				2.0			—
State and political subdivisions		378,457				51,117				3,498				426,076				1.7			—
Other foreign government, supranational and foreign government-sponsored enterprises		2,041,148				110,065				13,089				2,138,124				8.4			—
Total fixed maturity securities		$	23,105,597			$	2,508,673			$	133,298			$	25,480,972			100.0	%		$	(1,555	)
Non-redeemable preferred stock		$	93,540			$	7,350			$	1,527			$	99,363			78.3	%
Other equity securities		26,994				597				94				27,497				21.7
Total equity securities		$	120,534			$	7,947			$	1,621			$	126,860			100.0	%

December 31, 2013:		Amortized Cost				Unrealized Gains				Unrealized Losses				Estimated Fair Value				% of Total			Other-than- temporary impairments in AOCI
Available-for-sale:
Corporate securities		$	11,697,394			$	616,147			$	202,786			$	12,110,755			56.4	%		$	—
Canadian and Canadian provincial governments		2,728,111				669,762				16,848				3,381,025				15.7			—
Residential mortgage-backed securities		970,434				38,126				18,917				989,643				4.6			(300		)
Asset-backed securities		891,751				18,893				15,812				894,832				4.2			(2,259		)
Commercial mortgage-backed securities		1,314,782				91,651				17,487				1,388,946				6.5			(1,609		)
U.S. government and agencies		489,631				16,468				4,748				501,351				2.3			—
State and political subdivisions		313,252				21,907				14,339				320,820				1.5			—
Other foreign government, supranational and foreign government-sponsored enterprises		1,865,379				45,347				23,962				1,886,764				8.8			—
Total fixed maturity securities		$	20,270,734			$	1,518,301			$	314,899			$	21,474,136			100.0	%		$	(4,168	)
Non-redeemable preferred stock		$	81,993			$	5,342			$	5,481			$	81,854			20.2	%
Other equity securities		327,479				618				4,220				323,877				79.8
Total equity securities		$	409,472			$	5,960			$	9,701			$	405,731			100.0	%

Schedule of Financial Instruments Owned and Pledged as Collateral [Table Text Block]

The following table includes fixed maturity securities pledged and received as collateral, and assets in trust held to satisfy collateral requirements under certain third-party reinsurance treaties as of December 31, 2014 and 2013 (dollars in thousands):

	2014								2013
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities pledged as collateral	$	127,229			$	134,863			$	57,241			$	57,963
Fixed maturity securities received as collateral	n/a				117,227				n/a				94,143
Securities held in trust	10,197,489				10,922,947				7,842,893				8,125,402

Concentration Risk Disclosure [Text Block]

The Company’s exposure to concentrations of credit risk of single issuers greater than 10% of the Company’s stockholders’ equity as of December 31, 2014 and 2013 is as follows (dollars in thousands).

	2014								2013
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Ontario	$	979,908			$	1,359,339			$	1,023,427			$	1,222,296
Canadian province of Quebec	1,006,315				1,599,673				1,041,462				1,389,138

Investments Classified By Contractual Maturity Date [Table Text Block]

Asset and mortgage-backed securities are shown separately in the table below, as they are not due at a single maturity date.

		Amortized Cost				Estimated Fair Value
Available-for-sale:
Due in one year or less		$	556,034			$	561,396
Due after one year through five years		4,354,866				4,580,388
Due after five years through ten years		7,587,194				7,965,907
Due after ten years		7,102,319				8,733,208
Asset and mortgage-backed securities		3,505,184				3,640,073
Total		$	23,105,597			$	25,480,972

Fixed Maturity Holdings Industry Types [Table Text Block]

The tables below show the major industry types of the Company’s corporate fixed maturity holdings as of December 31, 2014 and 2013 (dollars in thousands):

December 31, 2014:		Amortized Cost				Estimated Fair Value				% of Total
Finance		$	4,789,568			$	5,066,408			34.0	%
Industrial		7,639,330				8,086,067				54.3
Utility		1,581,706				1,733,108				11.7
Total		$	14,010,604			$	14,885,583			100.0	%
December 31, 2013:		Amortized Cost				Estimated Fair Value				% of Total
Finance		$	3,838,716			$	3,983,623			32.9	%
Industrial		6,607,100				6,824,063				56.3
Utility		1,240,353				1,292,305				10.7
Other		11,225				10,764				0.1
Total		$	11,697,394			$	12,110,755			100.0	%

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

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):

		2014				2013				2012
Balance, beginning of period		$	11,696			$	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				10,186
Credit loss OTTI previously recognized on securities impaired to fair value during the period		—				(1,449		)		(22,290		)
Credit loss previously recognized on securities which matured, paid down, prepaid or were sold during the period		(4,412		)		(3,664		)		(37,130		)
Balance, end of period		$	7,284			$	11,696			$	16,675

AccountingForCertainLoansAndDebtSecuritiesAcquiredInTransferDisclosureTextBlock

The following tables present information on the Company’s purchased credit impaired securities, which are included in fixed maturity securities available-for-sale as of December 31, 2014 and 2013 (dollars in thousands):

	2014				2013
Outstanding principal and interest balance(1)	$	226,121			$	192,644
Carrying value, including accrued interest(2)	$	185,842			$	148,822

(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 ended December 31, 2014 and 2013, as of the acquisition dates (dollars in thousands).

	2014				2013
Contractually required payments (including interest)	$	96,617			$	161,975
Cash flows expected to be collected(1)	$	76,551			$	130,578
Fair value of investments acquired	$	53,950			$	87,643

(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 years ended December 31, 2014 and 2013 (dollars in thousands):

	2014				2013
Balance, beginning of period	$	69,469			$	39,239
Investments purchased	22,601				42,935
Accretion	(9,339		)		(7,755		)
Disposals	(379		)		(3,564		)
Reclassification from nonaccretable difference	(15,181		)		(1,386		)
Balance, end of period	$	67,171			$	69,469

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

The following table presents the total gross unrealized losses for the 932 and 1,396 fixed maturity and equity securities at December 31, 2014 and 2013, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

		2014							2013
		Gross Unrealized Losses				% of Total			Gross Unrealized Losses				% of Total
Less than 20%		$	111,965			83.0	%		$	296,731			91.4	%
20% or more for less than six months		13,698				10.1			6,444				2.0
20% or more for six months or greater		9,256				6.9			21,425				6.6
Total		$	134,919			100.0	%		$	324,600			100.0	%

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

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
December 31, 2014:		Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses
Investment grade securities:
Corporate securities		$	1,225,767			$	27,784			$	614,294			$	30,040			$	1,840,061			$	57,824
Canadian and Canadian provincial governments		—				—				1,235				7				1,235				7
Residential mortgage-backed securities		78,864				846				135,414				5,247				214,278				6,093
Asset-backed securities		332,785				4,021				109,411				4,289				442,196				8,310
Commercial mortgage-backed securities		78,632				564				28,375				2,461				107,007				3,025
U.S. government and agencies		81,317				89				32,959				426				114,276				515
State and political subdivisions		13,780				17				18,998				3,438				32,778				3,455
Other foreign government, supranational and foreign government-sponsored enterprises		156,725				7,007				76,111				2,946				232,836				9,953
Total investment grade securities		1,967,870				40,328				1,016,797				48,854				2,984,667				89,182
Non-investment grade securities:
Corporate securities		415,886				29,316				32,567				3,404				448,453				32,720
Residential mortgage-backed securities		22,836				293				6,284				225				29,120				518
Asset-backed securities		12,448				274				7,108				1,791				19,556				2,065
Commercial mortgage-backed securities		3,288				249				5,580				5,385				8,868				5,634
State and political subdivisions		964				43				—				—				964				43
Other foreign government, supranational and foreign government-sponsored enterprises		13,986				3,136				—				—				13,986				3,136
Total non-investment grade securities		469,408				33,311				51,539				10,805				520,947				44,116
Total fixed maturity securities		$	2,437,278			$	73,639			$	1,068,336			$	59,659			$	3,505,614			$	133,298
Non-redeemable preferred stock		$	11,619			$	235			$	19,100			$	1,292			$	30,719			$	1,527
Other equity securities		—				—				3,545				94				3,545				94
Total equity securities		$	11,619			$	235			$	22,645			$	1,386			$	34,264			$	1,621

		Less than 12 months								12 months or greater								Total
December 31, 2013:		Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses				Estimated Fair Value				Gross Unrealized Losses
Investment grade securities:
Corporate securities		$	3,141,179			$	148,895			$	301,303			$	40,548			$	3,442,482			$	189,443
Canadian and Canadian provincial governments		188,491				14,419				12,029				2,429				200,520				16,848
Residential mortgage-backed securities		283,967				15,900				23,068				1,688				307,035				17,588
Asset-backed securities		255,656				4,916				56,668				4,983				312,324				9,899
Commercial mortgage-backed securities		219,110				3,725				20,068				5,745				239,178				9,470
U.S. government and agencies		133,697				4,469				4,406				279				138,103				4,748
State and political subdivisions		120,193				9,723				15,202				4,616				135,395				14,339
Other foreign government, supranational and foreign government-sponsored enterprises		665,313				21,075				36,212				2,847				701,525				23,922
Total investment grade securities		5,007,606				223,122				468,956				63,135				5,476,562				286,257
Non-investment grade securities:
Corporate securities		283,603				9,451				38,256				3,892				321,859				13,343
Residential mortgage-backed securities		62,146				1,075				3,945				254				66,091				1,329
Asset-backed securities		28,670				415				32,392				5,498				61,062				5,913
Commercial mortgage-backed securities		15,762				81				10,980				7,936				26,742				8,017
Other foreign government, supranational and foreign government-sponsored enterprises		9,403				40				—				—				9,403				40
Total non-investment grade securities		399,584				11,062				85,573				17,580				485,157				28,642
Total fixed maturity securities		$	5,407,190			$	234,184			$	554,529			$	80,715			$	5,961,719			$	314,899
Non-redeemable preferred stock		$	51,386			$	5,479			$	1			$	2			$	51,387			$	5,481
Other equity securities		218,834				1,748				32,550				2,472				251,384				4,220
Total equity securities		$	270,220			$	7,227			$	32,551			$	2,474			$	302,771			$	9,701

Investment Income [Table Text Block]

Major categories of investment income, net of related expenses consist of the following (dollars in thousands):

		2014				2013				2012
Fixed maturity securities available-for-sale		$	1,052,715			$	966,759			$	868,682
Mortgage loans on real estate		148,417				121,476				96,901
Policy loans		55,248				57,099				62,855
Funds withheld at interest		447,364				545,550				393,586
Short-term investments		2,118				2,236				4,173
Other invested assets		70,149				58,771				49,199
Investment income		1,776,011				1,751,891				1,475,396
Investment expense		(62,320		)		(52,026		)		(39,190		)
Investment income, net of related expenses		$	1,713,691			$	1,699,865			$	1,436,206

Gain (Loss) on Investments [Table Text Block]

Investment related gains (losses), net, consist of the following (dollars in thousands):

		2014				2013				2012
Fixed maturity and equity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings		$	(7,766	)		$	(12,901	)		$	(23,526	)
Impairment losses on equity securities		—				—				(3,025		)
Gain on investment activity		65,435				82,744				145,268
Loss on investment activity		(31,295		)		(60,575		)		(27,474		)
Other impairment losses and change in mortgage loan provision		(5,315		)		(6,933		)		(16,602		)
Derivatives and other, net		165,134				61,655				179,495
Total investment related gains (losses), net		$	186,193			$	63,990			$	254,136

Schedule of Repurchase Agreements [Table Text Block]

The following table includes the amount of borrowed securities, repurchased securities pledged and repurchased/reverse repurchased securities pledged and received as of December 31, 2014 and 2013 (dollars in thousands).

	2014								2013
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Borrowed securities	$	201,050			$	212,946			$	93,000			$	93,000
Repurchase program securities pledged	92,446				107,158				—				—
Repurchase program/reverse repurchase program:
Securities pledged	298,466				314,160				300,350				310,781
Securities received	n/a				338,929				n/a				344,169

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 December 31, 2014 and 2013 (dollars in thousands):

		2014							2013
		Recorded Investment				Percentage of Total			Recorded Investment				Percentage of Total
Property type:
Office building		$	851,749			31.3	%		$	917,284			36.7	%
Retail		802,466				29.6			748,731				30.0
Industrial		466,583				17.2			439,890				17.6
Apartment		376,430				13.8			289,394				11.6
Other commercial		221,481				8.1			101,487				4.1
Total		$	2,718,709			100.0	%		$	2,496,786			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, 2014 and 2013 are as follows (dollars in thousands):

		2014				2013
Due within five years		$	860,362			$	987,109
Due after five years through ten years		1,165,530				984,289
Due after ten years		692,817				525,388
Total		$	2,718,709			$	2,496,786

Mortgage Loan Internal Credit Risk Grade [Table Text Block]

Information regarding the Company’s credit quality indicators, as determined by the Company's internal evaluation methodology for its recorded investment in mortgage loans, gross of valuation allowances, as of December 31, 2014 and 2013 are as follows (dollars in thousands):

Internal credit quality grade:		2014				2013
High investment grade		$	1,326,199			$	1,437,244
Investment grade		1,235,046				827,993
Average		118,152				155,914
Watch list		22,285				49,404
In or near default		17,027				26,231
Total		$	2,718,709			$	2,496,786

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

The following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances, as of December 31, 2014 and 2013 (dollars in thousands):

		2014				2013
Mortgage loans:
Individually measured for impairment		$	17,027			$	37,841
Collectively measured for impairment		2,701,682				2,458,945
Mortgage loans, gross of valuation allowances		2,718,709				2,496,786
Valuation allowances:
Individually measured for impairment		816				3,211
Collectively measured for impairment		5,655				6,895
Total valuation allowances		6,471				10,106
Mortgage loans, net of valuation allowances		$	2,712,238			$	2,486,680

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, 2014, 2013 and 2012 are as follows (dollars in thousands):

		2014				2013				2012
Balance, beginning of period		$	10,106			$	11,580			$	11,793
Charge-offs, net of recoveries		(2,731		)		(3,431		)		(6,474		)
Provision		(904		)		1,957				6,261
Balance, end of period		$	6,471			$	10,106			$	11,580

Impaired Financing Receivables [Table Text Block]

Information regarding the portion of the Company’s mortgage loans that were impaired as of December 31, 2014 and 2013 is as follows (dollars in thousands):

		Unpaid Principal Balance				Recorded Investment				Related Allowance				Carrying Value
December 31, 2014:
Impaired mortgage loans with no valuation allowance recorded		$	7,314			$	6,711			$	—			$	6,711
Impaired mortgage loans with valuation allowance recorded		10,279				10,316				816				9,500
Total impaired mortgage loans		$	17,593			$	17,027			$	816			$	16,211
December 31, 2013:
Impaired mortgage loans with no valuation allowance recorded		$	21,698			$	21,100			$	—			$	21,100
Impaired mortgage loans with valuation allowance recorded		16,772				16,741				3,211				13,530
Total impaired mortgage loans		$	38,470			$	37,841			$	3,211			$	34,630

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, 2014, 2013 and 2012 (dollars in thousands):

		2014								2013								2012
		Average Investment(1)				Interest Income				Average Investment(1)				Interest Income				Average Investment(1)				Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	13,227			$	647			$	15,023			$	852			$	15,549			$	1,244
Impaired mortgage loans with valuation allowance recorded		13,827				637				22,818				951				34,434				425
Total		$	27,054			$	1,284			$	37,841			$	1,803			$	49,983			$	1,669

(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 Assets [Table Text Block]

Other invested assets represented approximately 3.3% and 4.1% of the Company’s invested assets as of December 31, 2014 and 2013, respectively. Carrying values of these assets as of December 31, 2014 and 2013 are as follows (dollars in thousands):

		2014				2013
Equity securities		$	126,860			$	405,731
Limited partnerships and real estate joint ventures		446,604				411,456
Structured loans		164,309				223,549
Derivatives		216,966				75,227
FVO contractholder-directed unit-linked investments		140,344				138,892
Other		103,236				70,105
Total other invested assets		$	1,198,319			$	1,324,960

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The table presents the rollforward of valuation allowance for mortgage loans held-for-investment, by portfolio segment.

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Investments classified by contractual maturity date.

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Fair value of fixed maturity and equity securities with related unrelized losses by duration..

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This table presents information regarding the credit quality indicators for mortgage loans.

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