Investments (Tables)

3 Months Ended

Mar. 31, 2014

Investments, Debt and Equity Securities [Abstract]

Amortized cost and fair value summary

The cost (amortized cost for fixed maturities and short-term investments), fair value, gross unrealized gains and gross unrealized (losses), including other-than-temporary impairments (“OTTI”) recorded in accumulated other comprehensive income (“AOCI”) of the Company’s available for sale (“AFS”) and held to maturity (“HTM”) investments at March 31, 2014 and December 31, 2013, were as follows:

March 31, 2014 (U.S. dollars in thousands)	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Non-credit Related OTTI (1)
Fixed maturities - AFS
U.S. Government and Government-Related/Supported (2)	$	2,282,321	$	59,678	$	(22,947	)	$	2,319,052	$	—
Corporate (3) (4)	10,697,760		490,229		(79,484		)	11,108,505		(4,758		)
RMBS – Agency	3,186,504		74,788		(38,809		)	3,222,483		—
RMBS – Non-Agency	389,181		36,836		(24,624		)	401,393		(71,999		)
CMBS	1,172,597		36,282		(10,567		)	1,198,312		(2,662		)
CDO	758,469		3,649		(37,058		)	725,060		(1,936		)
Other asset-backed securities (5)	1,156,561		46,219		(6,468		)	1,196,312		(2,117		)
U.S. States and political subdivisions of the States	1,832,247		84,695		(14,491		)	1,902,451		—
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported (2)	5,009,524		110,972		(54,240		)	5,066,256		—
Total fixed maturities - AFS	$	26,485,164	$	943,348	$	(288,688	)	$	27,139,824	$	(83,472	)
Total short-term investments (2)	$	382,509	$	181	$	(577	)	$	382,113	$	—
Total equity securities (6)	$	907,952	$	166,197	$	(18,756	)	$	1,055,393	$	—
Total investments - AFS	$	27,775,625	$	1,109,726	$	(308,021	)	$	28,577,330	$	(83,472	)
Fixed maturities - HTM
U.S. Government and Government-Related/Supported (2)	$	11,052	$	918	$	—		$	11,970	$	—
Corporate	1,376,931		135,909		(190		)	1,512,650		—
RMBS – Non-Agency	67,037		6,743		—			73,780		—
CMBS	145,005		15,215		—			160,220		—
Other asset-backed securities (5)	106,514		9,437		—			115,951		—
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported (2)	1,147,948		186,656		—			1,334,604		—
Total investments - HTM	$	2,854,487	$	354,878	$	(190	)	$	3,209,175	$	—

___________

(1) Represents the non-credit component of OTTI losses, adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.

(2) U.S. Government and Government-Related/Supported, Non-U.S. Sovereign Government, Provincials, Supranationals and Government-Related/Supported and Total short-term investments includes government-related securities with an amortized cost of $2,301.8 million and fair value of $2,365.0 million and U.S. Agencies with an amortized cost of $238.0 million and fair value of $261.5 million.

(3) Included within Corporate are certain medium term notes supported primarily by pools of European investment grade credit with varying degrees of leverage. The notes have a fair value of $154.7 million and an amortized cost of $146.2 million. These notes allow the investor to participate in cash flows of the underlying bonds including certain residual values, which could serve to either decrease or increase the ultimate values of these notes.

(4) Included within Corporate are Tier One and Upper Tier Two securities, representing committed term debt and hybrid instruments, which are senior to the common and preferred equities of the financial institutions. These securities have a fair value of $279.8 million and an amortized cost of $281.3 million.

(5) Covered Bonds within Fixed maturities - AFS with an amortized cost of $508.3 million and a fair value of $537.5 million and Covered Bonds within Fixed maturities - HTM with an amortized cost of $8.6 million and a fair value of $8.9 million are included within Other asset-backed securities to align the Company's classification to market indices.

(6) Included within Total equity securities are investments in fixed income funds with a fair value of $89.1 million and an amortized cost of $100.9 million.

December 31, 2013 (U.S. dollars in thousands)	Cost or Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value		Non-credit Related OTTI (1)
Fixed maturities - AFS
U.S. Government and Government-Related/Supported (2)	$	2,484,193	$	51,701	$	(34,043	)	$	2,501,851	$	—
Corporate (3) (4)	10,802,332		433,097		(109,599		)	11,125,830		(4,758		)
RMBS – Agency	3,540,101		68,098		(62,077		)	3,546,122		—
RMBS – Non-Agency	396,798		33,096		(31,126		)	398,768		(74,528		)
CMBS	1,223,313		39,255		(15,773		)	1,246,795		(2,753		)
CDO	754,414		5,833		(42,934		)	717,313		(2,036		)
Other asset-backed securities (5)	1,210,384		40,560		(8,840		)	1,242,104		(2,807		)
U.S. States and political subdivisions of the States	1,821,499		55,083		(30,770		)	1,845,812		—
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported (2)	4,878,840		80,961		(84,260		)	4,875,541		—
Total fixed maturities - AFS	$	27,111,874	$	807,684	$	(419,422	)	$	27,500,136	$	(86,882	)
Total short-term investments (2)	$	455,470	$	962	$	(144	)	$	456,288	$	—
Total equity securities (6)	$	903,201	$	154,506	$	(17,470	)	$	1,040,237	$	—
Total investments - AFS	$	28,470,545	$	963,152	$	(437,036	)	$	28,996,661	$	(86,882	)
Fixed maturities - HTM
U.S. Government and Government-Related/Supported (2)	$	10,993	$	629	$	—		$	11,622	$	—
Corporate	1,386,863		113,179		(968		)	1,499,074		—
RMBS – Non-Agency	66,987		4,985		—			71,972		—
CMBS	144,924		11,864		—			156,788		—
Other asset-backed securities (5)	106,540		6,908		—			113,448		—
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported (2)	1,142,388		136,585		(642		)	1,278,331		—
Total investments - HTM	$	2,858,695	$	274,150	$	(1,610	)	$	3,131,235	$	—

____________

(1) Represents the non-credit component of OTTI losses, adjusted for subsequent sales of securities. It does not include the change in fair value subsequent to the impairment measurement date.

(2) U.S. Government and Government-Related/Supported, Non-U.S. Sovereign Government, Provincials, Supranationals and Government-Related/Supported and Total short-term investments includes government-related securities with an amortized cost of $2,241.5 million and fair value of $2,275.6 million and U.S. Agencies with an amortized cost of $267.0 million and fair value of $284.3 million.

(3) Included within Corporate are certain medium term notes supported primarily by pools of European investment grade credit with varying degrees of leverage. The notes have a fair value of $154.6 million and an amortized cost of $147.7 million. These notes allow the investor to participate in cash flows of the underlying bonds including certain residual values, which could serve to either decrease or increase the ultimate values of these notes.

(4) Included within Corporate are Tier One and Upper Tier Two securities, representing committed term debt and hybrid instruments, which are senior to the common and preferred equities of the financial institutions. These securities have a fair value of $282.2 million and an amortized cost of $286.2 million.

(5) Covered Bonds within Fixed maturities - AFS with an amortized cost of $526.4 million and a fair value of $553.1 million and Covered Bonds within Fixed maturities - HTM with an amortized cost of $8.6 million and a fair value of $8.7 million are included within Other asset-backed securities to align the Company's classification to market indices.

(6) Included within Total equity securities are investments in fixed income funds with a fair value of $87.4 million and an amortized cost of $100.0 million.

Contractual maturities summary

The contractual maturities of AFS and HTM fixed income securities at March 31, 2014 and December 31, 2013 are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	March 31, 2014 (1)				December 31, 2013 (1)
(U.S. dollars in thousands)	Amortized Cost		Fair Value		Amortized Cost		Fair Value
Fixed maturities - AFS
Due less than one year	$	2,209,571	$	2,222,523	$	2,052,251	$	2,060,365
Due after 1 through 5 years	10,037,689		10,290,224		10,075,087		10,305,986
Due after 5 through 10 years	5,263,018		5,400,185		5,474,120		5,507,450
Due after 10 years	2,311,574		2,483,332		2,385,406		2,475,233
	$	19,821,852	$	20,396,264	$	19,986,864	$	20,349,034
RMBS – Agency	3,186,504		3,222,483		3,540,101		3,546,122
RMBS – Non-Agency	389,181		401,393		396,798		398,768
CMBS	1,172,597		1,198,312		1,223,313		1,246,795
CDO	758,469		725,060		754,414		717,313
Other asset-backed securities	1,156,561		1,196,312		1,210,384		1,242,104
Total mortgage and asset-backed securities	$	6,663,312	$	6,743,560	$	7,125,010	$	7,151,102
Total fixed maturities - AFS	$	26,485,164	$	27,139,824	$	27,111,874	$	27,500,136
Fixed maturities - HTM
Due less than one year	$	67,170	$	68,553	$	65,651	$	66,766
Due after 1 through 5 years	268,264		285,906		240,802		255,322
Due after 5 through 10 years	558,210		626,387		455,633		492,095
Due after 10 years	1,642,287		1,878,378		1,778,158		1,974,844
	$	2,535,931	$	2,859,224	$	2,540,244	$	2,789,027
RMBS – Non-Agency	67,037		73,780		66,987		71,972
CMBS	145,005		160,220		144,924		156,788
Other asset-backed securities	106,514		115,951		106,540		113,448
Total mortgage and asset-backed securities	$	318,556	$	349,951	$	318,451	$	342,208
Total fixed maturities - HTM	$	2,854,487	$	3,209,175	$	2,858,695	$	3,131,235

____________

(1) Included in the table above are Tier One and Upper Tier Two securities, representing committed term debt and hybrid instruments, which are senior to the common and preferred equities of the financial institutions, at their fair values of $279.8 million and $282.2 million at March 31, 2014 and December 31, 2013, respectively. These securities are reflected in the table based on their call date and have net unrealized losses of $1.6 million and $4.0 million at March 31, 2014 and December 31, 2013, respectively.

Summary of unrealized losses

The following is an analysis of how long the AFS and HTM securities at March 31, 2014 and December 31, 2013 had been in a continual unrealized loss position:

	Less than 12 months					Equal to or greater than 12 months
March 31, 2014 (U.S. dollars in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Fixed maturities and short-term investments - AFS
U.S. Government and Government-Related/Supported	$	1,184,414	$	(21,102	)	$	29,951	$	(1,862	)
Corporate	2,097,447		(36,002		)	452,530		(43,503		)
RMBS – Agency	991,462		(28,596		)	145,427		(10,213		)
RMBS – Non-Agency	6,412		(195		)	232,860		(24,429		)
CMBS	188,965		(3,671		)	107,903		(6,896		)
CDO	126,159		(544		)	557,163		(36,514		)
Other asset-backed securities	73,704		(1,136		)	80,190		(5,332		)
U.S. States and political subdivisions of the States	238,854		(7,318		)	112,668		(7,173		)
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported	1,444,095		(31,908		)	433,789		(22,871		)
Total fixed maturities and short-term investments - AFS	$	6,351,512	$	(130,472	)	$	2,152,481	$	(158,793	)
Total equity securities	$	187,067	$	(18,756	)	$	—	$	—
Fixed maturities -HTM
Corporate	$	11,347	$	(171	)	$	595	$	(19	)
Total fixed maturities - HTM	$	11,347	$	(171	)	$	595	$	(19	)

	Less than 12 months					Equal to or greater than 12 months
December 31, 2013 (U.S. dollars in thousands)	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
Fixed maturities and short-term investments - AFS
U.S. Government and Government-Related/Supported	$	1,333,704	$	(30,474	)	$	44,158	$	(3,614	)
Corporate	2,756,235		(59,497		)	513,106		(50,160		)
RMBS – Agency	1,485,261		(50,362		)	169,704		(11,715		)
RMBS – Non-Agency	14,204		(604		)	240,946		(30,522		)
CMBS	432,820		(6,816		)	107,192		(8,957		)
CDO	58,239		(217		)	574,613		(42,717		)
Other asset-backed securities	196,639		(2,149		)	96,528		(6,691		)
U.S. States and political subdivisions of the States	463,974		(23,124		)	64,324		(7,646		)
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported	2,130,792		(56,866		)	306,873		(27,435		)
Total fixed maturities and short-term investments - AFS	$	8,871,868	$	(230,109	)	$	2,117,444	$	(189,457	)
Total equity securities	$	155,453	$	(17,470	)	$	—	$	—
Fixed maturities -HTM
Corporate	$	46,034	$	(941	)	$	642	$	(27	)
Non-U.S. Sovereign Government, Provincial, Supranational and Government-Related/Supported	—		—			11,894		(642		)
Total fixed maturities - HTM	$	46,034	$	(941	)	$	12,536	$	(669	)

Analysis of net realized gains (losses) on investments

The following represents an analysis of net realized gains (losses) on investments:

Net Realized Gains (Losses) on Investments	Three months ended March 31,
(U.S. dollars in thousands)	2014			2013
Gross realized gains	$	51,213		$	73,171
Gross realized losses on investments sold	(28,257		)	(32,024		)
OTTI on investments, net of amounts transferred to other comprehensive income	(3,727		)	(4,638		)
Net realized gains (losses) on investments	$	19,229		$	36,509

Credit loss impairments on fixed inmcome securities rollforward

The following table sets forth the amount of credit loss impairments on fixed income securities held by the Company as of the dates or the periods indicated, for which a portion of the OTTI loss was recognized in OCI, and the corresponding changes in such amounts.

Credit Loss Impairments	Three months ended March 31,
(U.S. dollars in thousands)	2014			2013
Opening balance at beginning of indicated period	$	174,805		$	268,708
Credit loss impairment recognized in the current period on securities not previously impaired	12			500
Credit loss impairments previously recognized on securities which matured, paid down, prepaid or were sold during the period	(3,348		)	(6,475		)
Credit loss impairments previously recognized on securities impaired to fair value during the period	—			—
Additional credit loss impairments recognized in the current period on securities previously impaired	2,261			2,304
Accretion of credit loss impairments previously recognized due to an increase in cash flows expected to be collected	(2,347		)	(4,971		)
Balance at March 31,	$	171,383		$	260,066