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Investments (Tables)

9 Months Ended

Sep. 30, 2015

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, 2015 and December 31, 2014 (dollars in thousands):

September 30, 2015:		Amortized				Unrealized				Unrealized				Estimated Fair				% of			Other-than- temporary impairments
		Cost				Gains				Losses				Value				Total			in AOCI
Available-for-sale:
Corporate securities		$	15,801,362			$	702,697			$	330,612			$	16,173,447			59.1	%		$	—
Canadian and Canadian provincial governments		2,520,495				1,023,160				929				3,542,726				12.9			—
Residential mortgage-backed securities		1,234,158				55,711				6,409				1,283,460				4.7			(300		)
Asset-backed securities		1,055,760				16,971				11,359				1,061,372				3.9			354
Commercial mortgage-backed securities		1,441,845				58,555				8,449				1,491,951				5.4			(1,609		)
U.S. government and agencies		1,337,493				20,688				40,963				1,317,218				4.8			—
State and political subdivisions		466,685				42,564				7,746				501,503				1.8			—
Other foreign government, supranational and foreign government-sponsored enterprises		1,986,997				89,648				36,534				2,040,111				7.4			—
Total fixed maturity securities		$	25,844,795			$	2,009,994			$	443,001			$	27,411,788			100.0	%		$	(1,555	)
Non-redeemable preferred stock		$	89,726			$	2,737			$	7,754			$	84,709			76.7	%
Other equity securities		26,968				—				1,303				25,665				23.3
Total equity securities		$	116,694			$	2,737			$	9,057			$	110,374			100.0	%

December 31, 2014:		Amortized				Unrealized				Unrealized				Estimated Fair				% of			Other-than- temporary impairments
		Cost				Gains				Losses				Value				Total			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	%

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 September 30, 2015 and December 31, 2014 (dollars in thousands):

	September 30, 2015								December 31, 2014
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities pledged as collateral	$	181,380			$	194,189			$	127,229			$	134,863
Fixed maturity securities received as collateral	n/a				243,212				n/a				117,227
Securities held in trust	10,106,789				10,619,581				10,197,489				10,922,947

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 included securities of the U.S. government and its agencies as of September 30, 2015, as well as the securities disclosed below as of September 30, 2015 and December 31, 2014 (dollars in thousands).

	September 30, 2015								December 31, 2014
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Ontario	$	876,694			$	1,209,125			$	979,908			$	1,359,339
Canadian province of Quebec	966,171				1,464,067				1,006,315				1,599,673

Investments Classified By Contractual Maturity Date

The amortized cost and estimated fair value of fixed maturity securities available-for-sale at September 30, 2015 are shown by contractual maturity in the table below (dollars in thousands). 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.

		Amortized Cost				Estimated Fair Value
Available-for-sale:
Due in one year or less		$	649,473			$	657,750
Due after one year through five years		4,976,774				5,182,233
Due after five years through ten years		7,762,616				7,980,594
Due after ten years		8,724,169				9,754,428
Asset and mortgage-backed securities		3,731,763				3,836,783
Total		$	25,844,795			$	27,411,788

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, 2015 and December 31, 2014 (dollars in thousands):

September 30, 2015:						Estimated
		Amortized Cost				Fair Value				% of Total
Finance		$	5,092,474			$	5,279,879			32.7	%
Industrial		9,004,544				9,099,228				56.2
Utility		1,704,344				1,794,340				11.1
Total		$	15,801,362			$	16,173,447			100.0	%
December 31, 2014:						Estimated
		Amortized Cost				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	%

Other than Temporary Impairment, Credit Losses Recognized in Earnings [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):

		Three months ended September 30,								Nine months ended September 30,
		2015				2014				2015				2014
Balance, beginning of period		$	7,284			$	7,284			$	7,284			$	11,696
Credit loss OTTI previously recognized on securities which matured, paid down, prepaid or were sold during the period		—				—				—				(4,412		)
Balance, end of period		$	7,284			$	7,284			$	7,284			$	7,284

Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures

The following table presents the total gross unrealized losses for the 1,640 and 932 fixed maturity and equity securities as of September 30, 2015 and December 31, 2014, respectively, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

		September 30, 2015							December 31, 2014
		Gross Unrealized Losses				% of Total			Gross Unrealized Losses				% of Total
Less than 20%		$	363,451			80.4	%		$	111,965			83.0	%
20% or more for less than six months		72,884				16.1			13,698				10.1
20% or more for six months or greater		15,723				3.5			9,256				6.9
Total		$	452,058			100.0	%		$	134,919			100.0	%

Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block]

The following tables present the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,640 and 932 fixed maturity and equity securities that have estimated fair values below amortized cost as of September 30, 2015 and December 31, 2014, 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, 2015:		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
		Fair Value				Losses				Fair Value				Losses				Fair Value				Losses
Investment grade securities:
Corporate securities		$	4,647,733			$	216,291			$	302,808			$	30,784			$	4,950,541			$	247,075
Canadian and Canadian provincial governments		81,615				929				—				—				81,615				929
Residential mortgage-backed securities		231,621				2,363				66,339				3,247				297,960				5,610
Asset-backed securities		289,210				3,234				182,478				6,193				471,688				9,427
Commercial mortgage-backed securities		222,799				3,499				24,236				1,122				247,035				4,621
U.S. government and agencies		909,226				40,963				—				—				909,226				40,963
State and political subdivisions		128,633				4,204				13,206				3,542				141,839				7,746
Other foreign government, supranational and foreign government-sponsored enterprises		293,121				9,368				37,900				3,353				331,021				12,721
Total investment grade securities		6,803,958				280,851				626,967				48,241				7,430,925				329,092
Below investment grade securities:
Corporate securities		659,513				60,972				112,210				22,565				771,723				83,537
Residential mortgage-backed securities		42,309				445				8,797				354				51,106				799
Asset-backed securities		6,905				85				13,677				1,847				20,582				1,932
Commercial mortgage-backed securities		3,238				262				7,280				3,566				10,518				3,828
Other foreign government, supranational and foreign government-sponsored enterprises		87,340				16,297				20,541				7,516				107,881				23,813
Total below investment grade securities		799,305				78,061				162,505				35,848				961,810				113,909
Total fixed maturity securities		$	7,603,263			$	358,912			$	789,472			$	84,089			$	8,392,735			$	443,001
Non-redeemable preferred stock		$	38,857			$	5,481			$	6,411			$	2,273			$	45,268			$	7,754
Other equity securities		25,619				1,303				—				—				25,619				1,303
Total equity securities		$	64,476			$	6,784			$	6,411			$	2,273			$	70,887			$	9,057

		Less than 12 months								12 months or greater								Total
						Gross								Gross								Gross
December 31, 2014:		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
		Fair Value				Losses				Fair Value				Losses				Fair Value				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
Below 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 below 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

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,
		2015				2014				2015				2014
Fixed maturity securities available-for-sale		$	298,376			$	269,346			$	871,936			$	766,764
Mortgage loans on real estate		36,547				39,070				108,440				102,535
Policy loans		16,475				13,825				46,763				41,014
Funds withheld at interest		40,382				124,685				239,967				345,484
Short-term investments		576				462				2,085				1,507
Other invested assets		13,696				15,416				48,141				48,937
Investment income		406,052				462,804				1,317,332				1,306,241
Investment expense		(16,455		)		(15,698		)		(50,305		)		(44,153		)
Investment income, net of related expenses		$	389,597			$	447,106			$	1,267,027			$	1,262,088

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,
	2015				2014				2015				2014
Fixed maturity and equity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings	$	(23,111	)		$	(246	)		$	(29,775	)		$	(1,419	)
Gain on investment activity	13,792				8,819				53,002				51,773
Loss on investment activity	(22,186		)		(6,355		)		(50,257		)		(19,815		)
Other impairment losses and change in mortgage loan provision	(636		)		(2,041		)		(4,661		)		(5,686		)
Derivatives and other, net	(79,205		)		22,141				(88,250		)		200,563
Total investment related gains (losses), net	$	(111,346	)		$	22,318			$	(119,941	)		$	225,416

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 September 30, 2015 and December 31, 2014 (dollars in thousands).

	September 30, 2015								December 31, 2014
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Borrowed securities	$	265,240			$	281,225			$	201,050			$	212,946
Repurchase program securities pledged	—				—				92,446				107,158
Repurchase program/reverse repurchase program:
Securities pledged	442,679				468,008				298,466				314,160
Securities received	n/a				484,751				n/a				338,929

Schedule of Underlying Assets of Repurchase Agreements when Amount of Repurchase Agreements Exceeds 10 Percent of Assets [Table Text Block]

The following table presents information on the securities pledged as collateral by the Company related to its repurchase/reverse repurchase program as of September 30, 2015 (dollars in thousands). Collateral associated with certain borrowed securities is not included within the table as the collateral pledged to each counterparty is the right to reinsurance treaty cash flows.

	September 30, 2015
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous				Up to 30 Days				30-90 Days				Greater than 90 Days				Total
Collateral on repurchase program
U.S. government and agencies	$	—			$	—			$	—			$	201,681			$	201,681
Residential mortgage-backed securities	—				—				—				101,888				101,888
Corporate securities	—				—				3,042				145,434				148,476
Foreign government	—				—				—				3,484				3,484
Other	12,479				—				—				—				12,479
Total borrowings	$	12,479			$	—			$	3,042			$	452,487			$	468,008
Gross amount of recognized liabilities for repurchase agreement in preceding table																	$	484,751
Amounts related to agreements not included in offsetting disclosure																	$	16,743

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, 2015 and December 31, 2014 (dollars in thousands):

		September 30, 2015							December 31, 2014
Property type:		Recorded Investment				% of Total			Recorded Investment				% of Total
Office building		$	959,181			30.2	%		$	851,749			31.3	%
Retail		1,007,083				31.7			802,466				29.6
Industrial		571,346				18.0			466,583				17.2
Apartment		423,509				13.3			376,430				13.8
Other commercial		214,535				6.8			221,481				8.1
Total		$	3,175,654			100.0	%		$	2,718,709			100.0	%

Mortgage Loans Classified By Contractual Maturity Date [Table Text Block]

The maturities of the mortgage loans, gross of valuation allowances, as of September 30, 2015 and December 31, 2014 are as follows (dollars in thousands):

		September 30, 2015							December 31, 2014
		Recorded Investment				% of Total			Recorded Investment				% of Total
Due within five years		$	932,955			29.4	%		$	860,362			31.6	%
Due after five years through ten years		1,511,275				47.6			1,165,530				42.9
Due after ten years		731,424				23.0			692,817				25.5
Total		$	3,175,654			100.0	%		$	2,718,709			100.0	%

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 September 30, 2015 and December 31, 2014 is as follows (dollars in thousands):

		September 30, 2015							December 31, 2014
Internal credit quality grade:		Recorded Investment				% of Total			Recorded Investment				% of Total
High investment grade		$	1,681,552			52.9	%		$	1,326,199			48.8	%
Investment grade		1,378,194				43.4			1,235,046				45.4
Average		77,217				2.4			118,152				4.4
Watch list		17,857				0.6			22,285				0.8
In or near default		20,834				0.7			17,027				0.6
Total		$	3,175,654			100.0	%		$	2,718,709			100.0	%

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, 2015 and December 31, 2014 (dollars in thousands):

		September 30, 2015				December 31, 2014
Mortgage loans:
Individually measured for impairment		$	20,834			$	17,027
Collectively measured for impairment		3,154,820				2,701,682
Mortgage loans, gross of valuation allowances		3,175,654				2,718,709
Valuation allowances:
Individually measured for impairment		710				816
Collectively measured for impairment		4,942				5,655
Total valuation allowances		5,652				6,471
Mortgage loans, net of valuation allowances		$	3,170,002			$	2,712,238

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, 2015 and 2014 is as follows (dollars in thousands):

		Three months ended September 30,								Nine months ended September 30,
		2015				2014				2015				2014
Balance, beginning of period		$	5,942			$	9,692			$	6,471			$	10,106
Charge-offs, net of recoveries		—				(2,757		)		—				(2,733		)
Provision (release)		(290		)		(93		)		(819		)		(531		)
Balance, end of period		$	5,652			$	6,842			$	5,652			$	6,842

Impaired Financing Receivables Table

		Three months ended September 30,								Nine months ended September 30,
		2015				2014				2015				2014
Balance, beginning of period		$	5,942			$	9,692			$	6,471			$	10,106
Charge-offs, net of recoveries		—				(2,757		)		—				(2,733		)
Provision (release)		(290		)		(93		)		(819		)		(531		)
Balance, end of period		$	5,652			$	6,842			$	5,652			$	6,842

Information regarding the portion of the Company’s mortgage loans that were impaired as of September 30, 2015 and December 31, 2014 is as follows (dollars in thousands):

		Unpaid Principal Balance				Recorded Investment				Related Allowance				Carrying Value
September 30, 2015:
Impaired mortgage loans with no valuation allowance recorded		$	8,434			$	8,374			$	—			$	8,374
Impaired mortgage loans with valuation allowance recorded		12,969				12,460				710				11,750
Total impaired mortgage loans		$	21,403			$	20,834			$	710			$	20,124
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
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,
		2015								2014
		Average Recorded Investment(1)				Interest Income				Average Recorded   Investment(1)				Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	6,364			$	71			$	9,159			$	225
Impaired mortgage loans with valuation allowance recorded		12,495				194				14,870				26
Total impaired mortgage loans		$	18,859			$	265			$	24,029			$	251
		Nine months ended September 30,
		2015								2014
		Average Recorded Investment(1)				Interest Income				Average Recorded Investment(1)				Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	6,533			$	212			$	14,856			$	614
Impaired mortgage loans with valuation allowance recorded		11,392				578				14,705				478
Total impaired mortgage loans		$	17,925			$	790			$	29,561			$	1,092

(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, 2015 and December 31, 2014 are as follows (dollars in thousands):

		September 30, 2015				December 31, 2014
Equity securities		$	110,374			$	126,860
Limited partnerships and real estate joint ventures		507,628				446,604
Structured loans		53,030				164,309
Derivatives		275,518				216,966
FVO contractholder-directed unit-linked investments		129,511				140,344
Other		111,443				103,236
Total other invested assets		$	1,187,504			$	1,198,319

X

- Definition

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