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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments [Abstract]

Available For Sale Securities

The following table provides information relating to investments in fixed maturity securities by sector as of March 31, 2018 (dollars in thousands):

March 31, 2018:		Amortized				Unrealized				Unrealized				Estimated Fair				% of			Other-than- temporary impairments
		Cost				Gains				Losses				Value				Total			in AOCI
Available-for-sale:
Corporate		$	22,890,985			$	869,867			$	240,383			$	23,520,469			61.9	%		$	—
Canadian government		2,803,077				1,297,817				3,040				4,097,854				10.8			—
RMBS		1,791,007				23,640				27,499				1,787,148				4.7			—
ABS		1,727,810				16,383				9,471				1,734,722				4.6			275
CMBS		1,281,452				12,717				12,236				1,281,933				3.4			—
U.S. government		1,486,262				9,266				59,414				1,436,114				3.8			—
State and political subdivisions		672,064				49,465				8,016				713,513				1.9			—
Other foreign government		3,261,048				133,865				21,406				3,373,507				8.9			—
Total fixed maturity securities		$	35,913,705			$	2,413,020			$	381,465			$	37,945,260			100.0	%		$	275

The following table provides information relating to investments in fixed maturity and equity securities by sector as of December 31, 2017 (dollars in thousands):

December 31, 2017:		Amortized				Unrealized				Unrealized				Estimated Fair				% of			Other-than- temporary impairments
		Cost				Gains				Losses				Value				Total			in AOCI
Available-for-sale:
Corporate		$	21,966,803			$	1,299,594			$	55,429			$	23,210,968			60.9	%		$	—
Canadian government		2,843,273				1,378,510				1,707				4,220,076				11.1			—
RMBS		1,695,126				36,632				11,878				1,719,880				4.5			—
ABS		1,634,758				18,798				5,194				1,648,362				4.3			275
CMBS		1,285,594				22,627				4,834				1,303,387				3.4			—
U.S. government		1,953,436				12,089				21,933				1,943,592				5.1			—
State and political subdivisions		647,727				59,997				4,296				703,428				1.8			—
Other foreign government		3,254,695				154,507				8,075				3,401,127				8.9			—
Total fixed maturity securities		$	35,281,412			$	2,982,754			$	113,346			$	38,150,820			100.0	%		$	275
Non-redeemable preferred stock		$	41,553			$	479			$	2,226			$	39,806			39.7	%
Other equity securities		61,288				479				1,421				60,346				60.3
Total equity securities		$	102,841			$	958			$	3,647			$	100,152			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 derivative transactions and certain third-party reinsurance treaties as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	March 31, 2018								December 31, 2017
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities pledged as collateral	$	72,850			$	75,384			$	72,542			$	75,622
Fixed maturity securities received as collateral	n/a				614,423				n/a				590,417
Assets in trust held to satisfy collateral requirements	16,316,662				17,076,547				15,584,296				16,715,281

Concentration Risk Disclosure [Text Block]

The Company’s exposure to concentrations of credit risk from single issuers greater than 10% of the Company’s stockholders’ equity included securities of the U.S. government and its agencies as well as the securities disclosed below as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018								December 31, 2017
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Fixed maturity securities guaranteed or issued by:
Canadian province of Quebec	$	1,106,753			$	1,863,568			$	1,119,337			$	1,917,996
Canadian province of Ontario	928,384				1,247,158				939,837				1,282,944

Investments Classified By Contractual Maturity Date

The amortized cost and estimated fair value of fixed maturity securities classified as available-for-sale at March 31, 2018 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		$	900,166			$	905,385
Due after one year through five years		7,939,821				8,084,053
Due after five years through ten years		9,533,025				9,779,934
Due after ten years		12,740,424				14,372,085
Asset and mortgage-backed securities		4,800,269				4,803,803
Total		$	35,913,705			$	37,945,260

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 March 31, 2018 and December 31, 2017 (dollars in thousands):

March 31, 2018:						Estimated
		Amortized Cost				Fair Value				% of Total
Finance		$	8,250,681			$	8,407,037			35.8	%
Industrial		12,093,034				12,437,180				52.8
Utility		2,547,270				2,676,252				11.4
Total		$	22,890,985			$	23,520,469			100.0	%
December 31, 2017:						Estimated
		Amortized Cost				Fair Value				% of Total
Finance		$	7,977,885			$	8,362,774			36.1	%
Industrial		11,535,166				12,199,333				52.5
Utility		2,453,752				2,648,861				11.4
Total		$	21,966,803			$	23,210,968			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):

		Three months ended March 31,
		2018				2017
Balance, beginning of period		$	3,677			$	6,013
Credit loss OTTI previously recognized on securities impaired to fair value during the period		—				(2,336		)
Balance, end of period		$	3,677			$	3,677

Investments In Debt And Equity Securities Gross Unrealized Losses Disclosures

The following table presents the total gross unrealized losses for the 2,114 fixed maturity securities as of March 31, 2018, where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

		March 31, 2018
		Gross Unrealized Losses				% of Total
Less than 20%		$	358,873			94.1	%
20% or more for less than six months		20,232				5.3
20% or more for six months or greater		2,360				0.6
Total		$	381,465			100.0	%

The following table presents the total gross unrealized losses for the 1,116 fixed maturity and equity securities at December 31, 2017 where the estimated fair value had declined and remained below amortized cost by the indicated amount (dollars in thousands):

		December 31, 2017
		Gross Unrealized Losses				% of Total
Less than 20%		$	113,466			97.0	%
20% or more for less than six months		689				0.6
20% or more for six months or greater		2,838				2.4
Total		$	116,993			100.0	%

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

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 2,114 fixed maturity securities that have estimated fair values below amortized cost as of March 31, 2018 (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
March 31, 2018:		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
		Fair Value				Losses				Fair Value				Losses				Fair Value				Losses
Investment grade securities:
Corporate		$	7,282,079			$	155,541			$	883,699			$	46,908			$	8,165,778			$	202,449
Canadian government		39,192				390				109,552				2,536				148,744				2,926
RMBS		897,255				19,899				225,288				7,575				1,122,543				27,474
ABS		612,053				7,001				114,605				2,423				726,658				9,424
CMBS		538,464				8,026				103,447				4,210				641,911				12,236
U.S. government		488,095				16,856				744,844				42,558				1,232,939				59,414
State and political subdivisions		135,158				3,331				67,949				4,685				203,107				8,016
Other foreign government		746,485				15,575				191,446				5,000				937,931				20,575
Total investment grade securities		10,738,781				226,619				2,440,830				115,895				13,179,611				342,514
Below investment grade securities:
Corporate		452,086				29,597				46,976				8,337				499,062				37,934
Canadian government		1,900				114				—				—				1,900				114
RMBS		—				—				1,272				25				1,272				25
ABS		—				—				1,173				47				1,173				47
Other foreign government		57,385				662				12,045				169				69,430				831
Total below investment grade securities		511,371				30,373				61,466				8,578				572,837				38,951
Total fixed maturity securities		$	11,250,152			$	256,992			$	2,502,296			$	124,473			$	13,752,448			$	381,465

The following table presents the estimated fair values and gross unrealized losses, including other-than-temporary impairment losses reported in AOCI, for 1,116 fixed maturity and equity securities that have estimated fair values below amortized cost as of December 31, 2017 (dollars in thousands):

		Less than 12 months								12 months or greater								Total
						Gross								Gross								Gross
December 31, 2017:		Estimated				Unrealized				Estimated				Unrealized				Estimated				Unrealized
		Fair Value				Losses				Fair Value				Losses				Fair Value				Losses
Investment grade securities:
Corporate		$	1,886,212			$	17,099			$	1,009,750			$	28,080			$	2,895,962			$	45,179
Canadian government		18,688				91				111,560				1,596				130,248				1,687
RMBS		566,699				5,852				224,439				6,004				791,138				11,856
ABS		434,274				2,707				168,524				2,434				602,798				5,141
CMBS		220,401				1,914				103,269				2,920				323,670				4,834
U.S. government		800,298				6,177				767,197				15,756				1,567,495				21,933
State and political subdivisions		43,510				242				68,666				4,054				112,176				4,296
Other foreign government		369,717				2,707				191,265				4,704				560,982				7,411
Total investment grade securities		4,339,799				36,789				2,644,670				65,548				6,984,469				102,337
Below investment grade securities:
Corporate		194,879				3,317				75,731				6,933				270,610				10,250
Canadian government		1,995				20				—				—				1,995				20
RMBS		—				—				1,369				22				1,369				22
ABS		—				—				1,489				53				1,489				53
Other foreign government		28,600				113				15,134				551				43,734				664
Total below investment grade securities		225,474				3,450				93,723				7,559				319,197				11,009
Total fixed maturity securities		$	4,565,273			$	40,239			$	2,738,393			$	73,107			$	7,303,666			$	113,346
Non-redeemable preferred stock		$	82			$	1			$	26,471			$	2,225			$	26,553			$	2,226
Other equity securities		5,820				1,023				47,251				398				53,071				1,421
Total equity securities		$	5,902			$	1,024			$	73,722			$	2,623			$	79,624			$	3,647

Investment Income

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

	Three months ended March 31,
	2018				2017
Fixed maturity securities available-for-sale	$	369,203			$	324,500
Equity securities	1,682				1,359
Mortgage loans on real estate	50,199				44,347
Policy loans	14,780				15,272
Funds withheld at interest	75,445				127,578
Short-term investments and cash and cash equivalents	3,245				1,510
Other	23,828				18,468
Investment income	538,382				533,034
Investment expense	(22,053		)		(18,670		)
Investment income, net of related expenses	$	516,329			$	514,364

Gain Loss On Investments

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

	Three months ended March 31,
	2018				2017
Fixed maturity securities available for sale:
Other-than-temporary impairment losses on fixed maturity securities recognized in earnings	$	—			$	(17,189	)
Gain on investment activity	10,966				17,893
Loss on investment activity	(20,380		)		(8,687		)
Equity securities:
Gain on investment activity	28				—
Loss on investment activity	(950		)		(3,876		)
Change in unrealized gains (losses) recognized in earnings	(4,137		)		—
Other impairment losses and change in mortgage loan provision	(312		)		(99		)
Derivatives and other, net	14,315				72,481
Total investment related gains (losses), net	$	(470	)		$	60,523

Schedule of Repurchase Agreements [Table Text Block]

The following table includes the amount of borrowed securities, securities lent and securities collateral received as part of the securities lending program and repurchased/reverse repurchased securities pledged and received as of March 31, 2018 and December 31, 2017 (dollars in thousands).

	March 31, 2018								December 31, 2017
	Amortized Cost				Estimated Fair Value				Amortized Cost				Estimated Fair Value
Borrowed securities	$	353,875			$	370,760			$	358,875			$	377,820
Securities lending:
Securities loaned	117,449				118,617				117,246				121,551
Securities received	n/a				128,000				n/a				128,000
Repurchase program/reverse repurchase program:
Securities pledged	403,135				411,988				413,819				428,344
Securities received	n/a				404,871				n/a				417,550

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 Company’s securities lending and repurchase transactions as of March 31, 2018 and December 31, 2017 (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.

	March 31, 2018
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous				Up to 30 Days				30-90 Days				Greater than 90 Days				Total
Securities lending transactions:
Corporate	$	—			$	—			$	—			$	118,617			$	118,617
Total	$	—			$	—			$	—			$	118,617			$	118,617
Repurchase transactions:
Corporate	$	—			$	—			$	—			$	171,678			$	171,678
RMBS	—				—				—				—				—
U.S. government	—				—				—				219,509				219,509
Foreign government	—				—				—				19,670				19,670
Other	1,131				—				—				—				1,131
Total	1,131				—				—				410,857				411,988
Total borrowings	$	1,131			$	—			$	—			$	529,474			$	530,605
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table																	$	563,587
Amounts related to agreements not included in offsetting disclosure																	$	32,982

	December 31, 2017
	Remaining Contractual Maturity of the Agreements
	Overnight and Continuous				Up to 30 Days				30-90 Days				Greater than 90 Days				Total
Securities lending transactions:
Corporate	$	—			$	—			$	—			$	121,551			$	121,551
Total	$	—			$	—			$	—			$	121,551			$	121,551
Repurchase transactions:
Corporate	$	—			$	—			$	312			$	184,334			$	184,646
RMBS	—				—				—				—				—
U.S. government	—				—				—				220,765				220,765
Foreign government	—				—				—				21,802				21,802
Other	1,131				—				—				—				1,131
Total	1,131				—				312				426,901				428,344
Total borrowings	$	1,131			$	—			$	312			$	548,452			$	549,895
Gross amount of recognized liabilities for securities lending and repurchase transactions in preceding table																	$	576,786
Amounts related to agreements not included in offsetting disclosure																	$	26,891

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

he distribution of mortgage loans by property type is as follows as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018							December 31, 2017
Property type:		Carrying Value				% of Total			Carrying Value				% of Total
Office building		$	1,518,170			34.1	%		$	1,487,392			33.6	%
Retail		1,236,933				27.8			1,270,676				28.8
Industrial		964,685				21.7			938,612				21.3
Apartment		497,699				11.2			510,052				11.6
Other commercial		232,804				5.2			206,439				4.7
Recorded investment		4,450,291				100.0	%		$	4,413,171			100.0	%
Unamortized balance of loan origination fees and expenses		(3,433		)					(3,254		)
Valuation allowances		(8,864		)					(9,384		)
Total mortgage loans on real estate		$	4,437,994						$	4,400,533

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

he maturities of the mortgage loans as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

		March 31, 2018							December 31, 2017
		Recorded Investment				% of Total			Recorded Investment				% of Total
Due within five years		$	1,130,108			25.4	%		$	1,091,066			24.8	%
Due after five years through ten years		2,492,588				56.0			2,516,872				57.0
Due after ten years		827,595				18.6			805,233				18.2
Total		$	4,450,291			100.0	%		$	4,413,171			100.0	%

Mortgage Loan Internal Credit Risk Grade [Table Text Block]

The following tables set forth certain key credit quality indicators of the Company’s recorded investment in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

	Recorded Investment
	Debt Service Ratios												Construction loans
	>1.20x				1.00x - 1.20x				<1.00x								Total				% of Total
March 31, 2018:
Loan-to-Value Ratio
0% - 59.99%	$	2,154,344			$	79,738			$	6,855			$	12,279			$	2,253,216			50.6	%
60% - 69.99%	1,520,008				29,795				68,070				—				1,617,873				36.4
70% - 79.99%	360,183				27,682				30,904				—				418,769				9.4
Greater than 80%	125,660				30,497				4,276				—				160,433				3.6
Total	$	4,160,195			$	167,712			$	110,105			$	12,279			$	4,450,291			100.0	%

	Recorded Investment
	Debt Service Ratios												Construction loans
	>1.20x				1.00x - 1.20x				<1.00x								Total				% of Total
December 31, 2017:
Loan-to-Value Ratio
0% - 59.99%	$	2,148,428			$	53,979			$	3,801			$	—			$	2,206,208			50.0	%
60% - 69.99%	1,517,029				47,128				43,921				—				1,608,078				36.4
70% - 79.99%	396,446				19,461				15,367				—				431,274				9.8
Greater than 80%	120,850				30,713				6,362				9,686				167,611				3.8
Total	$	4,182,753			$	151,281			$	69,451			$	9,686			$	4,413,171			100.0	%

Past Due Financing Receivables [Table Text Block]

The age analysis of the Company’s past due recorded investments in mortgage loans as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018				December 31, 2017
31-60 days past due		$	17,102			$	17,100
61-90 days past due		—				2,056
Greater than 90 days		2,056				—
Total past due		19,158				19,156
Current		4,431,133				4,394,015
Total		$	4,450,291			$	4,413,171

Recorded Investment And Allowance For Credit Losses

he following table presents the recorded investment in mortgage loans, by method of measuring impairment, and the related valuation allowances as of March 31, 2018 and December 31, 2017 (dollars in thousands):

		March 31, 2018				December 31, 2017
Mortgage loans:
Individually measured for impairment		$	23,423			$	5,858
Collectively measured for impairment		4,426,868				4,407,313
Recorded investment		$	4,450,291			$	4,413,171
Valuation allowances:
Individually measured for impairment		$	—			$	—
Collectively measured for impairment		8,864				9,384
Total valuation allowances		$	8,864			$	9,384

Allowance For Mortgage Loan And Lease Losses Provision For Loss Net

nformation regarding the Company’s loan valuation allowances for mortgage loans for the three months ended March 31, 2018 and 2017 is as follows (dollars in thousands):

	Three months ended March 31,
	2018				2017
Balance, beginning of period	$	9,384			$	7,685
Provision (release)	(516		)		101
Translation adjustment	(4		)		—
Balance, end of period	$	8,864			$	7,786

Impaired Financing Receivables Table

Information regarding the portion of the Company’s mortgage loans that were impaired as of March 31, 2018 and December 31, 2017 is as follows (dollars in thousands):

		Unpaid Principal Balance				Recorded Investment				Related Allowance				Carrying Value
March 31, 2018:
Impaired mortgage loans with no valuation allowance recorded		$	—			$	23,423			$	—			$	23,423
Impaired mortgage loans with valuation allowance recorded		—				—				—				—
Total impaired mortgage loans		$	—			$	23,423			$	—			$	23,423
December 31, 2017:
Impaired mortgage loans with no valuation allowance recorded		$	6,427			$	5,858			$	—			$	5,858
Impaired mortgage loans with valuation allowance recorded		—				—				—				—
Total impaired mortgage loans		$	6,427			$	5,858			$	—			$	5,858
The Company’s average investment balance of impaired mortgage loans and the related interest income are reflected in the table below for the periods indicated (dollars in thousands):
		Three months ended March 31,
		2018								2017
		Average Recorded Investment(1)				Interest Income				Average Recorded Investment(1)				Interest Income
Impaired mortgage loans with no valuation allowance recorded		$	14,640			$	56			$	2,157			$	33
Impaired mortgage loans with valuation allowance recorded		—				—				—				—
Total impaired mortgage loans		$	14,640			$	56			$	2,157			$	33

(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]

arrying values of these assets as of March 31, 2018 and December 31, 2017 are as follows (dollars in thousands):

		March 31, 2018				December 31, 2017
Limited partnership interests and real estate joint ventures		805,613				781,124
Equity release mortgages		261,837				219,940
Derivatives		132,195				137,613
FVO contractholder-directed unit-linked investments		221,512				218,541
Other		90,990				148,114
Total other invested assets		$	1,512,147			$	1,505,332

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