10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C.  20549

FORM 10-Q

(Mark One)

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
For the period ended June 30, 2013
Or
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

Commission file number:  001-26456

ARCH CAPITAL GROUP LTD.

(Exact name of registrant as specified in its charter)

Bermuda

(State or other jurisdiction of incorporation or organization)

Not Applicable

(I.R.S. Employer Identification No.)

Wessex House, 5th Floor, 45 Reid Street

Hamilton HM 12, Bermuda

(Address of principal executive offices)

(441) 278-9250

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days. Yes x     No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files). Yes x     No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer o
Non-accelerated filer o	Smaller reporting company o

Indicate by check mark whether the Registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes o   No x

The number of the registrant’s common shares (par value, $0.0033 per share) outstanding as of August 2, 2013 was 133,420,370.

ARCH CAPITAL GROUP LTD.

INDEX

	Page No.
PART I. Financial Information
Item 1 — Consolidated Financial Statements
Report of Independent Registered Public Accounting Firm	2
Consolidated Balance Sheets
June 30, 2013 (unaudited) and December 31, 2012	3
Consolidated Statements of Income
For the three and six month periods ended June 30, 2013 and 2012 (unaudited)	4
Consolidated Statements of Comprehensive Income
For the three and six month periods ended June 30, 2013 and 2012 (unaudited)	5
Consolidated Statements of Changes in Shareholders’ Equity
For the six month periods ended June 30, 2013 and 2012 (unaudited)	6
Consolidated Statements of Cash Flows
For the six month periods ended June 30, 2013 and 2012 (unaudited)	7
Notes to Consolidated Financial Statements (unaudited)	8
Item 2 — Management’s Discussion and Analysis of Financial Condition and Results of Operations	30
Item 3 — Quantitative and Qualitative Disclosures About Market Risk	61
Item 4 — Controls and Procedures	61
PART II. Other Information
Item 1 — Legal Proceedings	62
Item 2 — Unregistered Sales of Equity Securities and Use of Proceeds	62
Item 5 — Other Information	63
Item 6 — Exhibits	63

1

Report of Independent Registered Public Accounting Firm

To the Board of Directors and Shareholders of

Arch Capital Group Ltd.:

We have reviewed the accompanying consolidated balance sheet of Arch Capital Group Ltd. and its subsidiaries (the “Company”) as of June 30, 2013, and the related consolidated statements of income and comprehensive income for the three-month and six-month periods ended June 30, 2013 and June 30,2012, and the consolidated statements of changes in shareholders’ equity and cash flows for the six-month periods ended June 30, 2013 and June 30,2012. These interim financial statements are the responsibility of the Company’s management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States).  A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters.  It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board (United States), the objective of which is the expression of an opinion regarding the financial statements taken as a whole.  Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the accompanying consolidated interim financial statements for them to be in conformity with accounting principles generally accepted in the United States of America.

We previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet as of December 31, 2012, and the related consolidated statements of income, comprehensive income, changes in shareholders’ equity, and cash flows for the year then ended (not presented herein), and in our report dated March 1, 2013, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying consolidated balance sheet as of December 31, 2012, is fairly stated in all material respects in relation to the consolidated balance sheet from which it has been derived.

/s/ PricewaterhouseCoopers LLP

New York, NY

August 9, 2013

2

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES CONSOLIDATED BALANCE SHEETS (U.S. dollars in thousands, except share data)
	(Unaudited)
	June 30, 2013			December 31, 2012
Assets
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $9,619,842 and $9,567,290)	$	9,570,583		$	9,839,988
Short-term investments available for sale, at fair value (amortized cost: $1,095,497 and $719,848)	1,091,032			722,121
Investment of funds received under securities lending, at fair value (amortized cost: $39,079 and $42,302)	41,062			42,531
Equity securities available for sale, at fair value (cost: $410,219 and $298,414)	438,038			312,749
Other investments available for sale, at fair value (cost: $555,422 and $519,955)	569,407			549,280
Investments accounted for using the fair value option	1,065,684			917,466
Investments accounted for using the equity method	208,796			307,105
Total investments	12,984,602			12,691,240
Cash	375,119			371,041
Accrued investment income	68,413			71,748
Investment in joint venture (cost: $100,000)	108,710			107,284
Fixed maturities and short-term investments pledged under securities lending, at fair value	47,763			50,848
Premiums receivable	876,989			688,873
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,849,891			1,870,037
Contractholder receivables	947,887			865,728
Prepaid reinsurance premiums	330,854			298,484
Deferred acquisition costs, net	313,010			262,822
Receivable for securities sold	447,545			19,248
Other assets	566,900			519,409
Total Assets	$	18,917,683		$	17,816,762
Liabilities
Reserve for losses and loss adjustment expenses	$	8,808,594		$	8,933,292
Unearned premiums	1,921,849			1,647,978
Reinsurance balances payable	210,113			188,546
Contractholder payables	947,887			865,728
Senior notes	300,000			300,000
Revolving credit agreement borrowings	100,000			100,000
Securities lending payable	49,135			52,356
Payable for securities purchased	853,156			37,788
Other liabilities	492,631			522,196
Total Liabilities	13,683,365			12,647,884
Commitments and Contingencies
Shareholders’ Equity
Non-cumulative preferred shares	325,000			325,000
Common shares ($0.0033 par, shares issued: 169,245,371 and 168,255,572)	564			561
Additional paid-in capital	272,955			227,778
Retained earnings	5,776,808			5,354,361
Accumulated other comprehensive income (loss), net of deferred income tax	(49,322		)	287,017
Common shares held in treasury, at cost (shares: 35,828,952 and 34,412,959)	(1,091,687		)	(1,025,839		)
Total Shareholders' Equity	5,234,318			5,168,878
Total Liabilities and Shareholders' Equity	$	18,917,683		$	17,816,762

See Notes to Consolidated Financial Statements

3

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF INCOME (U.S. dollars in thousands, except share data)
	(Unaudited)						(Unaudited)
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Revenues
Net premiums written	$	810,535		$	820,233		$	1,763,311		$	1,683,844
Change in unearned premiums	(51,719		)	(93,577		)	(251,725		)	(276,876		)
Net premiums earned	758,816			726,656			1,511,586			1,406,968
Net investment income	68,369			73,608			134,041			147,905
Net realized gains	12,652			34,867			70,992			78,988
Other-than-temporary impairment losses	(724		)	(2,454		)	(2,972		)	(3,485		)
Less investment impairments recognized in other comprehensive income, before taxes	—			503			2			511
Net impairment losses recognized in earnings	(724		)	(1,951		)	(2,970		)	(2,974		)
Fee income	902			806			1,440			1,349
Equity in net income of investment funds accounted for using the equity method	10,941			7,787			24,764			32,613
Other income (loss)	834			695			2,078			(7,373		)
Total revenues	851,790			842,468			1,741,931			1,657,476
Expenses
Losses and loss adjustment expenses	418,653			399,693			818,056			794,900
Acquisition expenses	131,677			128,289			259,269			247,251
Other operating expenses	127,408			117,701			247,591			224,173
Interest expense	5,852			7,439			11,750			14,960
Net foreign exchange gains	(13,811		)	(31,689		)	(38,075		)	(11,001		)
Total expenses	669,779			621,433			1,298,591			1,270,283
Income before income taxes	182,011			221,035			443,340			387,193
Income tax expense	5,071			767			9,924			2,669
Net income	176,940			220,268			433,416			384,524
Preferred dividends	5,485			7,649			10,969			14,110
Loss on repurchase of preferred shares	—			10,612			—			10,612
Net income available to common shareholders	$	171,455		$	202,007		$	422,447		$	359,802
Net income per common share
Basic	$	1.31		$	1.50		$	3.22		$	2.68
Diluted	$	1.26		$	1.46		$	3.11		$	2.61
Weighted average common shares and common share equivalents outstanding
Basic	131,377,274			134,529,129			131,143,885			134,241,876
Diluted	135,849,050			138,211,736			135,624,226			138,017,490

See Notes to Consolidated Financial Statements

4

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (U.S. dollars in thousands)
	(Unaudited)						(Unaudited)
	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Comprehensive Income (Loss)
Net income	$	176,940		$	220,268		$	433,416		$	384,524
Other comprehensive income, net of deferred income tax
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	(259,562		)	18,060			(250,091		)	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	—			(503		)	(2		)	(511		)
Reclassification of net realized gains, net of income taxes, included in net income	(13,916		)	(43,792		)	(52,617		)	(71,303		)
Foreign currency translation adjustments, net of deferred income tax	(5,407		)	(15,136		)	(33,629		)	(1,935		)
Other comprehensive income (loss)	(278,885		)	(41,371		)	(336,339		)	39,174
Comprehensive Income (Loss)	$	(101,945	)	$	178,897		$	97,077		$	423,698

See Notes to Consolidated Financial Statements

5

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CHANGES IN SHAREHOLDERS’ EQUITY (U.S. dollars in thousands)
	(Unaudited)
	Six Months Ended
	June 30,
	2013			2012
Non-Cumulative Preferred Shares
Balance at beginning of year	$	325,000		$	325,000
Shares issued - Series C	—			325,000
Shares repurchased - Series A and B	—			(325,000		)
Balance at end of period	325,000			325,000
Common Shares
Balance at beginning of year	561			549
Common shares issued, net	3			7
Balance at end of period	564			556
Additional Paid-in Capital
Balance at beginning of year	227,778			161,419
Common shares issued, net	5,362			4,553
Issue costs on Series C preferred shares	—			(9,398		)
Reversal of issue costs on repurchase of preferred shares	—			10,612
Exercise of stock options	6,022			4,822
Amortization of share-based compensation	31,466			23,930
Other	2,327			1,687
Balance at end of period	272,955			197,625
Retained Earnings
Balance at beginning of year	5,354,361			4,796,655
Net income	433,416			384,524
Dividends declared on preferred shares	(10,969		)	(14,110		)
Loss on repurchase of preferred shares	—			(10,612		)
Balance at end of period	5,776,808			5,156,457
Accumulated Other Comprehensive Income (Loss)
Balance at beginning of year	287,017			153,923
Change in unrealized appreciation (decline) in value of investments, net of deferred income tax	(302,708		)	41,620
Portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(2		)	(511		)
Foreign currency translation adjustments, net of deferred income tax	(33,629		)	(1,935		)
Balance at end of period	(49,322		)	193,097
Common Shares Held in Treasury, at Cost
Balance at beginning of year	(1,025,839		)	(845,472		)
Shares repurchased for treasury	(65,848		)	(6,947		)
Balance at end of period	(1,091,687		)	(852,419		)
Total Shareholders’ Equity	$	5,234,318		$	5,020,316

See Notes to Consolidated Financial Statements

6

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES CONSOLIDATED STATEMENTS OF CASH FLOWS (U.S. dollars in thousands)
	(Unaudited)
	Six Months Ended
	June 30,
	2013			2012
Operating Activities
Net income	$	433,416		$	384,524
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized gains	(73,611		)	(80,753		)
Net impairment losses recognized in earnings	2,970			2,974
Equity in net income or loss of investment funds accounted for using the equity method and other income or loss	37,493			(18,141		)
Share-based compensation	31,466			23,930
Changes in:
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable	(33,163		)	107,670
Unearned premiums, net of prepaid reinsurance premiums	251,724			276,877
Premiums receivable	(205,044		)	(273,735		)
Deferred acquisition costs, net	(51,971		)	(45,390		)
Reinsurance balances payable	24,267			37,129
Other liabilities	(26,981		)	(2,526		)
Other items, net	(2,212		)	(15,291		)
Net Cash Provided By Operating Activities	388,354			397,268
Investing Activities
Purchases of:
Fixed maturity investments	(8,599,697		)	(7,546,498		)
Equity securities	(272,323		)	(110,303		)
Other investments	(648,915		)	(386,243		)
Proceeds from the sales of:
Fixed maturity investments	8,468,641			6,887,186
Equity securities	194,212			198,485
Other investments	506,434			216,964
Proceeds from redemptions and maturities of fixed maturity investments	424,953			598,792
Net purchases of short-term investments	(375,146		)	(174,607		)
Change in investment of securities lending collateral	3,221			(17,837		)
Purchase of business, net of cash acquired	—			28,948
Purchases of furniture, equipment and other assets	(7,092		)	(10,208		)
Net Cash Used For Investing Activities	(305,712		)	(315,321		)
Financing Activities
Proceeds from issuance of Series C preferred shares, net	—			315,789
Repurchase of Series A and B preferred shares	—			(325,000		)
Purchases of common shares under share repurchase program	(56,463		)	—
Proceeds from common shares issued, net	(517		)	348
Repayments of borrowings	—			(73,773		)
Change in securities lending collateral	(3,221		)	17,837
Other	5,042			3,464
Preferred dividends paid	(10,969		)	(17,412		)
Net Cash Used For Financing Activities	(66,128		)	(78,747		)
Effects of exchange rate changes on foreign currency cash	(12,436		)	493
Increase in cash	4,078			3,693
Cash beginning of year	371,041			351,699
Cash end of period	$	375,119		$	355,392

See Notes to Consolidated Financial Statements

7

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

1.General

Arch Capital Group Ltd. (“ACGL”) is a Bermuda public limited liability company which provides insurance and reinsurance on a worldwide basis through its wholly owned subsidiaries.

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of ACGL and its wholly owned subsidiaries (together with ACGL, the “Company”). All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted; however, management believes that the disclosures are adequate to make the information presented not misleading. This report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, including the Company’s audited consolidated financial statements and related notes.

The Company has reclassified the presentation of certain prior year information to conform to the current presentation. Such reclassifications had no effect on the Company’s net income, comprehensive income, shareholders’ equity or cash flows. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

2.Share Transactions

Share Repurchases

The board of directors of ACGL has authorized the investment in ACGL’s common shares through a share repurchase program. Repurchases under the program may be effected from time to time in open market or privately negotiated transactions through December 2014. Since the inception of the share repurchase program, ACGL has repurchased approximately 109.9 million common shares for an aggregate purchase price of $2.79 billion. During the 2013 second quarter and six months ended June 30, 2013, ACGL repurchased 0.3 million and 1.2 million common shares, respectively, for an aggregate purchase price of $15.5 million and $56.5 million, respectively. No share repurchases were made in the comparable 2012 periods. At June 30, 2013, $713.4 million of share repurchases were available under the program. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.

Share-Based Compensation

During the 2013 second quarter, the Company made a stock grant of 516,859 stock appreciation rights and stock options and 544,075 restricted shares and units to certain employees and directors with weighted average grant-date fair values of $13.35 and $53.50 per share, respectively. During the 2012 second quarter, the Company made a stock grant of 782,248 stock appreciation rights and stock options and 728,864 restricted shares and units with weighted average grant-date fair values of $9.91 and $38.59 per share, respectively. The stock appreciation rights and stock options were valued at the grant date using the Black-Scholes option pricing model. Such values are being amortized over the respective substantive vesting period. For awards granted to retirement-eligible employees where no service is required for the employee to retain the award, the grant date fair value is immediately recognized as compensation expense at the grant date because the employee is able to retain the award without continuing to provide service. For employees near retirement eligibility, attribution of compensation cost is over the period from the grant date to the retirement eligibility date.

8

Loss on Repurchase of Preferred Shares

The Company issued $325.0 million of 6.75% Series C preferred shares in April 2012 and subsequently redeemed all of its $200.0 million of 8.0% Series A preferred shares and $125.0 million of 7.875% Series B preferred shares at a redemption price equal to $25.00 per share in May 2012. In accordance with GAAP, upon issuance of the Series A and B preferred shares in 2006, costs of $10.6 million were recognized as a reduction of additional paid-in capital in shareholders' equity. Following the redemption of such shares, such issue costs were recorded as a “loss on repurchase of preferred shares” to remove the costs from additional paid-in capital in the second quarter of 2012, as revised and as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 (see Note 16 and Note 21).

.

3.Recent Accounting Pronouncements

Effective January 1, 2013, the Company adopted Financial Accounting Standards Board ("FASB") guidance requiring additional disclosures about reclassification adjustments from accumulated other comprehensive income. As this guidance is disclosure-related only, the adoption of this guidance did not impact the Company’s results of operations, financial condition or liquidity. The additional disclosures are provided in Note 11, "Other Comprehensive Income."

Effective January 1, 2013, the Company adopted FASB guidance requiring additional disclosures about financial instruments and derivative instruments that are either: (1) offset for balance sheet presentation purposes or (2) subject to an enforceable master netting arrangement or similar arrangement, regardless of whether they are offset for balance sheet presentation purposes. The disclosure requirements of this guidance are limited to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing/lending transactions. As this guidance is disclosure-related only and did not amend existing balance sheet offsetting guidance, adoption did not impact the Company’s results of operations, financial condition or liquidity. The additional disclosures are provided in Note 7, "Investment Information," and Note 9, "Derivative Instruments."

4.Commitments and Contingencies

Letter of Credit and Revolving Credit Facilities

As of June 30, 2013, the Company had a $300 million unsecured revolving loan and letter of credit facility and a $500 million secured letter of credit facility (the “Credit Agreement”). The Credit Agreement expires on August 18, 2014. In addition, the Company had access to secured letter of credit facilities of approximately $113.9 million as of June 30, 2013, which are available on a limited basis and for limited purposes (together with the secured portion of the Credit Agreement and these letter of credit facilities, the “LOC Facilities”). At June 30, 2013, the Company had $412.7 million in outstanding letters of credit under the LOC Facilities, which were secured by investments with a fair value of $481.3 million, and had $100.0 million of borrowings outstanding under the Credit Agreement. The Company was in compliance with all covenants contained in the LOC Facilities at June 30, 2013.

Investment Commitments

The Company’s investment commitments, which are primarily related to agreements entered into by the Company to invest in funds and separately managed accounts when called upon, were approximately $751.0 million at June 30, 2013.

Acquisition of CMG Mortgage Insurance Company and Mortgage Insurance Operating Platform of PMI

In February 2013, certain of the Company's U.S.-based subsidiaries (collectively “Arch U.S. MI”) entered into a definitive agreement to acquire (1) CMG Mortgage Insurance Company (“CMG MI”) from its current owners, PMI Mortgage Insurance Co. in rehabilitation (“PMI”), which has been under the receivership of the Arizona Department of Insurance since 2011, and CMFG Life Insurance Company, and (2) PMI's mortgage insurance operating platform and certain related assets from PMI. In connection with the closing of the transactions, PMI and an affiliate of the Company's U.S.-based subsidiaries will enter into a quota share reinsurance agreement pursuant to which such affiliate, as the reinsurer, will agree to provide 100% quota share indemnity reinsurance to PMI for all certificates of insurance that were issued by PMI between and including January 1, 2009 and December 31, 2011 that are not in default as of an agreed upon effective date. At closing, it is currently estimated that the Company's U.S.-based subsidiaries will pay aggregate consideration of approximately $300 million under all transaction documents. Additional amounts may be paid based on the actual results of CMG MI's pre-closing portfolio over an agreed upon period. In addition, the Company will enter into a services agreement with PMI to provide for necessary services to administer the run-off of PMI's legacy business at the direction of PMI.

9

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

On June 20, 2013, the Arizona receivership court provided the required approval of the acquisition. The transaction is also subject to approvals of the applicable regulators and approvals by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation of Arch U.S. MI as an eligible insurance carrier in the U.S. mortgage insurance marketplace, as well as the satisfaction of customary closing conditions. In connection with obtaining such consents of regulatory authorities and government-sponsored entities, it is anticipated that Arch U.S. MI or its affiliates will be required to make certain financial commitments to CMG MI, the form and amount of which will be determined based upon discussions with such authorities and entities. Arch U.S. MI's obligation to the sellers to accept financial requirements imposed by regulatory authorities and government-sponsored entities will be determined on the basis of, among other things, the appropriateness of such requirements in light of Arch U.S. MI's business plan and the consistency of such requirements with those imposed on other active participants in the U.S. mortgage insurance industry, as described in the purchase agreements. If these approvals are obtained, it is expected the transaction will close during the latter part of 2013.

5.Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Numerator:
Net income	$	176,940		$	220,268		$	433,416		$	384,524
Preferred dividends	(5,485		)	(7,649		)	(10,969		)	(14,110		)
Loss on repurchase of preferred shares	—			(10,612		)	—			(10,612		)
Net income available to common shareholders	$	171,455		$	202,007		$	422,447		$	359,802
Denominator:
Weighted average common shares outstanding — basic	131,377,274			134,529,129			131,143,885			134,241,876
Effect of dilutive common share equivalents:
Nonvested restricted shares	1,088,030			800,455			1,181,947			909,524
Stock options (1)	3,383,746			2,882,152			3,298,394			2,866,090
Weighted average common shares and common share equivalents outstanding — diluted	135,849,050			138,211,736			135,624,226			138,017,490
Earnings per common share:
Basic	$	1.31		$	1.50		$	3.22		$	2.68
Diluted	$	1.26		$	1.46		$	3.11		$	2.61

_________________________________________________

(1) Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2013 second quarter and 2012 second quarter, the number of stock options excluded were 1,428,616 and 912,056, respectively. For the six months ended June 30, 2013 and 2012, the number of stock options excluded were 1,730,313 and 688,634, respectively.

10

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

6.Segment Information

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to common shareholders:

	Three Months Ended									Three Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	703,904		$	337,642		$	1,040,738		$	676,090		$	376,981		$	1,051,813
Net premiums written	501,568			308,967			810,535			464,584			355,649			820,233
Net premiums earned	$	458,656		$	300,160		$	758,816		$	446,594		$	280,062		$	726,656
Fee income	529			373			902			628			178			806
Losses and loss adjustment expenses	(291,192		)	(127,461		)	(418,653		)	(290,416		)	(109,277		)	(399,693		)
Acquisition expenses, net	(74,249		)	(57,428		)	(131,677		)	(76,058		)	(52,231		)	(128,289		)
Other operating expenses	(80,167		)	(33,192		)	(113,359		)	(76,617		)	(29,140		)	(105,757		)
Underwriting income	$	13,577		$	82,452		96,029			$	4,131		$	89,592		93,723
Net investment income							68,369									73,608
Net realized gains							12,652									34,867
Net impairment losses recognized in earnings							(724		)							(1,951		)
Equity in net income of investment funds accounted for using the equity method							10,941									7,787
Other income (loss)							834									695
Other expenses							(14,049		)							(11,944		)
Interest expense							(5,852		)							(7,439		)
Net foreign exchange gains							13,811									31,689
Income before income taxes							182,011									221,035
Income tax expense							(5,071		)							(767		)
Net income							176,940									220,268
Preferred dividends							(5,485		)							(7,649		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	171,455								$	202,007
Underwriting Ratios
Loss ratio	63.5		%	42.5		%	55.2		%	65.0		%	39.0		%	55.0		%
Acquisition expense ratio (2)	16.1		%	19.1		%	17.3		%	16.9		%	18.6		%	17.6		%
Other operating expense ratio	17.5		%	11.1		%	14.9		%	17.2		%	10.4		%	14.6		%
Combined ratio	97.1		%	72.7		%	87.4		%	99.1		%	68.0		%	87.2		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

11

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

	Six Months Ended									Six Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	1,392,721		$	813,847		$	2,204,437		$	1,364,203		$	756,957		$	2,118,469
Net premiums written	1,006,118			757,193			1,763,311			955,264			728,580			1,683,844
Net premiums earned	$	903,621		$	607,965		$	1,511,586		$	888,334		$	518,634		$	1,406,968
Fee income	1,054			386			1,440			1,158			191			1,349
Losses and loss adjustment expenses	(574,659		)	(243,397		)	(818,056		)	(593,580		)	(201,320		)	(794,900		)
Acquisition expenses, net	(145,007		)	(114,262		)	(259,269		)	(149,928		)	(97,323		)	(247,251		)
Other operating expenses	(156,482		)	(66,792		)	(223,274		)	(149,987		)	(55,263		)	(205,250		)
Underwriting income (loss)	$	28,527		$	183,900		212,427			$	(4,003	)	$	164,919		160,916
Net investment income							134,041									147,905
Net realized gains							70,992									78,988
Net impairment losses recognized in earnings							(2,970		)							(2,974		)
Equity in net income of investment funds accounted for using the equity method							24,764									32,613
Other income (loss)							2,078									(7,373		)
Other expenses							(24,317		)							(18,923		)
Interest expense							(11,750		)							(14,960		)
Net foreign exchange gains							38,075									11,001
Income before income taxes							443,340									387,193
Income tax expense							(9,924		)							(2,669		)
Net income							433,416									384,524
Preferred dividends							(10,969		)							(14,110		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	422,447								$	359,802
Underwriting Ratios
Loss ratio	63.6		%	40.0		%	54.1		%	66.8		%	38.8		%	56.5		%
Acquisition expense ratio (2)	15.9		%	18.8		%	17.1		%	16.7		%	18.8		%	17.5		%
Other operating expense ratio	17.3		%	11.0		%	14.8		%	16.9		%	10.7		%	14.6		%
Combined ratio	96.8		%	69.8		%	86.0		%	100.4		%	68.3		%	88.6		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

12

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

7.Investment Information

Available For Sale Investments

The following table summarizes the fair value and cost or amortized cost of the Company’s investments classified as available for sale:

	Fair Value		Gross Unrealized Gains		Gross Unrealized Losses			Cost or Amortized Cost		OTTI Unrealized Losses (2)
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	33,423	$	(60,264	)	$	2,499,971	$	—
Mortgage backed securities	1,592,207		16,874		(46,562		)	1,621,895		(9,330		)
Municipal bonds	1,507,924		35,880		(14,222		)	1,486,266		(17		)
Commercial mortgage backed securities	838,471		15,687		(13,340		)	836,124		(231		)
U.S. government and government agencies	975,345		8,744		(7,251		)	973,852		(19		)
Non-U.S. government securities	1,002,989		9,671		(27,927		)	1,021,245		—
Asset backed securities	1,225,183		17,677		(17,948		)	1,225,454		(3,348		)
Total	9,615,249		137,956		(187,514		)	9,664,807		(12,945		)
Equity securities	438,038		44,653		(16,834		)	410,219		—
Other investments	569,407		32,313		(18,328		)	555,422		—
Short-term investments	1,094,129		174		(4,650		)	1,098,605		—
Total	$	11,716,823	$	215,096	$	(227,326	)	$	11,729,053	$	(12,945	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	105,798	$	(6,710	)	$	2,758,425	$	(62	)
Mortgage backed securities	1,532,736		24,809		(7,484		)	1,515,411		(9,329		)
Municipal bonds	1,463,586		62,322		(1,421		)	1,402,685		(17		)
Commercial mortgage backed securities	824,165		37,514		(4,468		)	791,119		(270		)
U.S. government and government agencies	1,131,688		20,178		(1,095		)	1,112,605		(19		)
Non-U.S. government securities	998,901		33,701		(8,860		)	974,060		—
Asset backed securities	1,073,999		25,528		(5,838		)	1,054,309		(3,346		)
Total	9,882,588		309,850		(35,876		)	9,608,614		(13,043		)
Equity securities	312,749		26,625		(12,290		)	298,414		—
Other investments	549,280		32,582		(3,257		)	519,955		—
Short-term investments	730,369		3,521		(1,248		)	728,096		—
Total	$	11,474,986	$	372,578	$	(52,671	)	$	11,155,079	$	(13,043	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

(2) Represents the total other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income (“AOCI”). It does not include the change in fair value subsequent to the impairment measurement date. At June 30, 2013, the net unrealized gain related to securities for which a non-credit OTTI was recognized in AOCI was $4.2 million, compared to a net unrealized gain of $2.0 million at December 31, 2012.

13

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	1,737,631	$	(58,235	)	$	17,492	$	(2,029	)	$	1,755,123	$	(60,264	)
Mortgage backed securities	1,015,422		(45,242		)	22,558		(1,320		)	1,037,980		(46,562		)
Municipal bonds	578,711		(13,690		)	10,380		(532		)	589,091		(14,222		)
Commercial mortgage backed securities	450,164		(13,132		)	2,111		(208		)	452,275		(13,340		)
U.S. government and government agencies	621,953		(7,251		)	—		—			621,953		(7,251		)
Non-U.S. government securities	726,472		(25,265		)	23,796		(2,662		)	750,268		(27,927		)
Asset backed securities	815,150		(14,822		)	31,177		(3,126		)	846,327		(17,948		)
Total	5,945,503		(177,637		)	107,514		(9,877		)	6,053,017		(187,514		)
Equity securities	181,248		(16,499		)	2,996		(335		)	184,244		(16,834		)
Other investments	197,537		(15,113		)	23,195		(3,215		)	220,732		(18,328		)
Short-term investments	161,476		(4,650		)	—		—			161,476		(4,650		)
Total	$	6,485,764	$	(213,899	)	$	133,705	$	(13,427	)	$	6,619,469	$	(227,326	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	490,784	$	(3,692	)	$	52,334	$	(3,018	)	$	543,118	$	(6,710	)
Mortgage backed securities	537,883		(4,290		)	60,574		(3,194		)	598,457		(7,484		)
Municipal bonds	147,766		(1,120		)	7,052		(301		)	154,818		(1,421		)
Commercial mortgage backed securities	36,649		(2,261		)	8,878		(2,207		)	45,527		(4,468		)
U.S. government and government agencies	146,526		(1,095		)	—		—			146,526		(1,095		)
Non-U.S. government securities	244,827		(1,070		)	135,564		(7,790		)	380,391		(8,860		)
Asset backed securities	234,584		(1,508		)	57,371		(4,330		)	291,955		(5,838		)
Total	1,839,019		(15,036		)	321,773		(20,840		)	2,160,792		(35,876		)
Equity securities	130,385		(10,200		)	16,469		(2,090		)	146,854		(12,290		)
Other investments	23,849		(2,474		)	35,083		(783		)	58,932		(3,257		)
Short-term investments	57,415		(1,248		)	—		—			57,415		(1,248		)
Total	$	2,050,668	$	(28,958	)	$	373,325	$	(23,713	)	$	2,423,993	$	(52,671	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

14

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

At June 30, 2013, on a lot level basis, approximately 2,410 security lots out of a total of approximately 4,590 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $4.0 million. At December 31, 2012, on a lot level basis, approximately 910 security lots out of a total of approximately 4,580 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $2.5 million.

The contractual maturities of the Company’s fixed maturities and fixed maturities pledged under securities lending agreements are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	June 30, 2013				December 31, 2012
Maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Due in one year or less	$	281,901	$	276,338	$	446,402	$	436,376
Due after one year through five years	3,358,388		3,356,354		3,876,062		3,769,426
Due after five years through 10 years	2,082,358		2,108,760		1,949,297		1,869,698
Due after 10 years	236,741		239,882		179,927		172,275
	5,959,388		5,981,334		6,451,688		6,247,775
Mortgage backed securities	1,592,207		1,621,895		1,532,736		1,515,411
Commercial mortgage backed securities	838,471		836,124		824,165		791,119
Asset backed securities	1,225,183		1,225,454		1,073,999		1,054,309
Total	$	9,615,249	$	9,664,807	$	9,882,588	$	9,608,614

Securities Lending Agreements

The Company operates a securities lending program under which certain of its fixed income portfolio securities are loaned to third parties, primarily major brokerage firms, for short periods of time through a lending agent. The fair value and amortized cost of fixed maturities and short-term investments pledged under securities lending agreements were $47.8 million and $48.1 million, respectively, at June 30, 2013, compared to $50.8 million and $49.6 million, respectively, at December 31, 2012. The fair value of the portfolio of collateral backing the Company's securities lending program was $41.1 million at June 30, 2013, compared to $42.5 million at December 31, 2012. Such amounts included approximately $6.3 million of sub-prime securities at June 30, 2013, compared to $5.4 million at December 31, 2012. The Company maintains legal control over the securities it lends, retains the earnings and cash flows associated with the loaned securities and receives a fee from the borrower for the temporary use of the securities. An indemnification agreement with the lending agent protects the Company in the event a borrower becomes insolvent or fails to return any of the securities on loan to the Company. 

15

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Other Investments

The following table summarizes the Company's other investments, including available for sale and fair value option components:

	June 30, 2013		December 31, 2012
Available for sale:
Asian and emerging markets	$	343,535	$	316,860
Investment grade fixed income	219,068		220,410
Other	6,804		12,010
Total available for sale	569,407		549,280
Fair value option:
Term loan investments (par value: $475,397 and $307,016)	481,773		308,596
Asian and emerging markets	28,932		24,035
Investment grade fixed income	74,320		67,624
Non-investment grade fixed income	9,331		11,093
Other (1)	118,018		116,623
Total fair value option	$	712,374	$	527,971
Total	$	1,281,781	$	1,077,251

_________________________________________________

(1) Includes fund investments with strategies in mortgage servicing rights, transportation and infrastructure assets and other.

Certain of the Company's other investments are in investment funds for which the Company has the option to redeem at agreed upon values as described in each investment fund's subscription agreement. Depending on the terms of the various subscription agreements, investments in investment funds may be redeemed daily, monthly, quarterly or on other terms. Two common redemption restrictions which may impact the Company's ability to redeem these investment funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the investment fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. If the investment funds are eligible to be redeemed, the time to redeem such fund can take weeks or months following the notification.

16

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Fair Value Option

The Company elected to carry certain fixed maturity securities, equity securities and other investments (primarily term loans) at fair value under the fair value option afforded by accounting guidance regarding the fair value option for financial assets and liabilities. Changes in fair value of investments accounted for using the fair value option are included in net realized gains or losses while interest income, dividends received and distributions from fund investments which are not a return of capital are reflected in net investment income. The primary reasons for electing the fair value option were to reflect economic events in earnings on a timely basis and to address practicality and cost-benefit considerations.

The following table summarizes the Company’s assets and liabilities which are accounted for using the fair value option:

	June 30, 2013		December 31, 2012
Fixed maturities	$	353,310	$	363,541
Other investments	712,374		527,971
Equity securities	—		25,954
Investments accounted for using the fair value option	1,065,684		917,466
Securities sold but not yet purchased (1)	—		(6,924		)
Net assets accounted for using the fair value option	$	1,065,684	$	910,542

_________________________________________________

(1) Represents the Company’s obligation to deliver equity securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

Net Investment Income

The components of net investment income were derived from the following sources:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities	$	62,004		$	70,290		$	124,010		$	143,740
Term loan investments (1)	6,026			3,557			10,243			5,856
Equity securities	3,164			2,425			4,587			4,089
Short-term investments	364			760			756			1,132
Other (2)	4,734			2,980			11,033			6,173
Gross investment income	76,292			80,012			150,629			160,990
Investment expenses	(7,923		)	(6,404		)	(16,588		)	(13,085		)
Net investment income	$	68,369		$	73,608		$	134,041		$	147,905

_________________________________________________

(1) Included in “investments accounted for using the fair value option” on the Company’s consolidated balance sheets.

(2) Amounts include dividends on investment funds and other items.

17

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

Net Realized Gains (Losses)

Net realized gains (losses) were as follows, excluding other-than-temporary impairment provisions:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Available for sale securities:
Gross gains on investment sales	$	68,853		$	67,936		$	135,873		$	115,948
Gross losses on investment sales	(54,783		)	(20,757		)	(79,839		)	(38,693		)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(6,702		)	(4,810		)	(1,644		)	3,407
Equity securities	5			(3,589		)	704			(202		)
Other investments	(9,502		)	(1,744		)	449			2,009
TALF investments	—			(1,274		)	—			(50		)
TALF borrowings	—			(176		)	—			895
Derivative instruments (1)	15,646			277			15,268			(4,392		)
Other	(865		)	(996		)	181			66
Net realized gains	$	12,652		$	34,867		$	70,992		$	78,988

_________________________________________________

(1) See Note 9 for information on the Company’s derivative instruments.

Other-Than-Temporary Impairments

The Company performs quarterly reviews of its available for sale investments in order to determine whether declines in fair value below the amortized cost basis were considered other-than-temporary in accordance with applicable guidance. The following table details the net impairment losses recognized in earnings by asset class:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities:
Mortgage backed securities	$	—		$	(146	)	$	(15	)	$	(892	)
Corporate bonds	—			(1,166		)	—			(1,362		)
Non-U.S. government securities	—			(261		)	—			(261		)
Asset backed securities	—			(106		)	(20		)	(106		)
U.S. government and government agencies	—			(10		)	—			(10		)
Total	—			(1,689		)	(35		)	(2,631		)
Investment of funds received under securities lending agreements	—			(6		)	—			(87		)
Equity securities	(724		)	(256		)	(2,935		)	(256		)
Net impairment losses recognized in earnings	$	(724	)	$	(1,951	)	$	(2,970	)	$	(2,974	)

A description of the methodology and significant inputs used to measure the amount of net impairment losses recognized in earnings in the 2013 periods is as follows:

• Equity securities — the Company utilized information received from asset managers on common stocks, including the business prospects, recent events, industry and market data and other factors. For certain equities which were in an unrealized loss position and where the Company determined that it did not have the intent or ability to hold such securities for a reasonable period of time by which the fair value of the securities would increase and the Company would recover its cost, the cost basis of such securities was adjusted down accordingly;

• Mortgage backed and asset backed securities — the Company utilized underlying data provided by asset managers, cash flow projections and additional information from credit agencies in order to determine an expected recovery value for each security. The analysis includes expected cash flow projections under base case

18

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

and stress case scenarios which modify the expected default expectations and loss severities and slow down prepayment assumptions. The significant inputs in the models include the expected default rates, delinquency rates and foreclosure costs. The expected recovery values were reduced on a small number of securities, primarily as a result of increases in expected default expectations and foreclosure costs. The amortized cost basis of the securities were adjusted down, if required, to the expected recovery value calculated in the OTTI review process.

The Company believes that the $13.0 million of OTTI included in accumulated other comprehensive income at June 30, 2013 on the securities which were considered by the Company to be impaired was due to market and sector-related factors (i.e., not credit losses). At June 30, 2013, the Company did not intend to sell these securities, or any other securities which were in an unrealized loss position, and determined that it is more likely than not that the Company will not be required to sell such securities before recovery of their cost basis.

The following table provides a roll forward of the amount related to credit losses recognized in earnings for which a portion of an OTTI was recognized in accumulated other comprehensive income:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Balance at start of period	$	61,956		$	67,086		$	62,001		$	66,545
Credit loss impairments recognized on securities not previously impaired	—			1,693			33			1,905
Credit loss impairments recognized on securities previously impaired	—			258			2			1,069
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	—			—			—			—
Reductions for securities sold during the period	(507		)	(6,511		)	(587		)	(6,993		)
Balance at end of period	$	61,449		$	62,526		$	61,449		$	62,526

Restricted Assets

The Company is required to maintain assets on deposit, which primarily consist of fixed maturities, with various regulatory authorities to support its insurance and reinsurance operations. The Company’s insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. See Note 4, “Commitments and Contingencies—Letter of Credit and Revolving Credit Facilities,” for further details. The following table details the value of the Company’s restricted assets:

	June 30, 2013		December 31, 2012
Assets used for collateral or guarantees:
Affiliated transactions	$	4,226,334	$	4,062,097
Third party agreements	793,162		771,631
Deposits with U.S. regulatory authorities	302,572		290,441
Deposits with non-U.S. regulatory authorities	6,591		247,321
Trust funds	103,021		96,342
Total restricted assets	$	5,431,680	$	5,467,832

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NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

8.Fair Value

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement (Level 1 being the highest priority and Level 3 being the lowest priority).

The levels in the hierarchy are defined as follows:

Level 1: Inputs to the valuation methodology are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets

Level 2: Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument

Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement

Following is a description of the valuation methodologies used for securities measured at fair value, as well as the general classification of such securities pursuant to the valuation hierarchy.

The Company determines the existence of an active market based on its judgment as to whether transactions for the financial instrument occur in such market with sufficient frequency and volume to provide reliable pricing information. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. The Company uses quoted values and other data provided by nationally recognized independent pricing sources as inputs into its process for determining fair values of its fixed maturity investments. To validate the techniques or models used by pricing sources, the Company's review process includes, but is not limited to: (i) quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated); (ii) a review of the average number of prices obtained in the pricing process and the range of resulting fair values; (iii) initial and ongoing evaluation of methodologies used by outside parties to calculate fair value including a review of deep dive reports on selected securities which indicate the use of observable inputs in the pricing process; (iv) comparing the fair value estimates to its knowledge of the current market; (v) a comparison of the pricing services' fair values to other pricing services' fair values for the same investments; and (vi) back-testing, which includes randomly selecting purchased or sold securities and comparing the executed prices to the fair value estimates from the pricing service. For a majority of investments, the Company obtained multiple quotes. A price source hierarchy was maintained in order to determine which price source would be used (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy prioritizes pricing services based on availability and reliability and assigns the highest priority to index providers. Based on the above review, the Company will challenge any prices for a security or portfolio which are considered not to be representative of fair value. At June 30, 2013, the Company adjusted certain prices (primarily on structured securities) obtained from the pricing services and substituted alternate prices (primarily broker-dealer quotes) for such securities. Such adjustments did not have a material impact on the overall fair value of the Company's investment portfolio at June 30, 2013.

The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. Each source has its own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of “matrix pricing” in which the independent pricing source uses observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades and sector groupings to determine a reasonable fair value. In addition, pricing vendors use model processes, such as an Option Adjusted Spread model, to develop prepayment and interest rate scenarios. The Option Adjusted Spread model is commonly used to estimate fair value for securities such as mortgage backed and asset backed securities. In certain circumstances, when fair values are unavailable from these independent pricing sources, quotes are obtained directly from broker-dealers who are active in the corresponding markets. Such quotes are subject to the validation procedures noted above. Of the $12.78 billion of financial assets and liabilities measured at fair value at June 30, 2013, approximately $1.45 billion, or 11.4%, were priced using non-binding broker-dealer quotes. Of the $12.40 billion of financial

20

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

assets and liabilities measured at fair value at December 31, 2012, approximately $927.9 million, or 7.5%, were priced using non-binding broker-dealer quotes.

The Company reviews its securities measured at fair value and discusses the proper classification of such investments with investment advisors and others. A discussion of the general classification of the Company's financial instruments follows:

Fixed maturities. The Company determined that all U.S. Treasuries would be classified as Level 1 securities due to observed levels of trading activity, the high number of strongly correlated pricing quotes received on U.S. Treasuries and other factors. Where the Company believes that quoted market prices are not available or that the market is not active, fair values are estimated by using quoted prices of securities with similar characteristics, pricing models or matrix pricing and are generally classified as Level 2 securities. The Company determined that Level 2 securities included corporate bonds, mortgage backed securities, municipal bonds, asset backed securities and non-U.S. government securities. The Company determined that certain Euro-denominated corporate bonds which invest in underlying portfolios of fixed income securities for which there is a low level of transparency around inputs to the valuation process should be classified within Level 3 of the valuation hierarchy and certain other corporate bonds.

Equity securities. The Company determined that exchange-traded equity securities would be included in Level 1 as their fair values are based on quoted market prices in active markets. Other equity securities are included in Level 2 of the valuation hierarchy.

Other investments. The fair values for certain of the Company's other investments are determined using net asset values (“NAV”) as advised by external fund managers. The NAV is based on the fund manager's valuation of the underlying holdings in accordance with the fund's governing documents. Periodically, the Company performs a number of monitoring procedures in order to assess the quality of the NAVs, including regular review and discussion of each fund's performance, regular evaluation of fund performance against applicable benchmarks and the backtesting of the NAVs against audited and interim financial statements. Other investments with liquidity terms allowing the Company to substantially redeem its holdings in a short time frame at the applicable NAV are reflected in Level 2. Other investments with redemption restrictions that prevent the Company from redeeming in the near term are classified in Level 3 of the valuation hierarchy.

Short-term investments. The Company determined that certain of its short-term investments held in highly liquid money market-type funds would be included in Level 1 as their fair values are based on quoted market prices in active markets. Other short-term investments are classified in Level 2 of the valuation hierarchy.

The Company reviews the classification of its investments each quarter. No transfers were made in the periods presented.

In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged under securities lending agreements. For purposes of the following tables, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged under securities lending agreements, at fair value.

21

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents the Company’s financial assets and liabilities measured at fair value by level at June 30, 2013:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	—	$	2,470,770	$	2,360
Mortgage backed securities	1,592,207		—		1,592,207		—
Municipal bonds	1,507,924		—		1,507,924		—
Commercial mortgage backed securities	838,471		—		838,471		—
U.S. government and government agencies	975,345		975,345		—		—
Non-U.S. government securities	1,002,989		—		1,002,989		—
Asset backed securities	1,225,183		—		1,225,183		—
Total	9,615,249		975,345		8,637,544		2,360
Equity securities	438,038		437,278		760		—
Other investments	569,407		—		379,514		189,893
Short-term investments	1,094,129		1,062,472		31,657		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	293,976		—		293,976		—
Non-U.S. government bonds	59,334		—		59,334		—
Other investments	712,374		—		422,185		290,189
Equity securities	—		—		—		—
Total	1,065,684		—		775,495		290,189
Total assets measured at fair value	$	12,782,507	$	2,475,095	$	9,824,970	$	482,442
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	—	$	—	$	—	$	—
Total liabilities measured at fair value	$	—	$	—	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2012:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	—	$	2,759,109	$	98,404
Mortgage backed securities	1,532,736		—		1,532,736		—
Municipal bonds	1,463,586		—		1,463,586		—
Commercial mortgage backed securities	824,165		—		824,165		—
U.S. government and government agencies	1,131,688		1,131,688		—		—
Non-U.S. government securities	998,901		—		998,901		—
Asset backed securities	1,073,999		—		1,073,999		—
Total	9,882,588		1,131,688		8,652,496		98,404
Equity securities	312,749		312,666		83		—
Other investments	549,280		—		365,078		184,202
Short-term investments	730,369		678,441		51,928		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	275,132		—		275,132		—
Non-U.S. government bonds	88,409		—		88,409		—
Other investments	527,971		—		332,621		195,350
Equity securities	25,954		25,954		—		—
Total	917,466		25,954		696,162		195,350
Total assets measured at fair value	$	12,392,452	$	2,148,749	$	9,765,747	$	477,956
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	6,924	$	6,924	$	—	$	—
Total liabilities measured at fair value	$	6,924	$	6,924	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

23

ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following tables present a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs:

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale					Fair Value Option
	Corporate Bonds			Other Investments		Other Investments			Total
Three Months Ended June 30, 2013
Balance at beginning of period	$	97,298		$	185,934	$	179,370		$	462,602
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	3,187			—		(2,075		)	1,112
Included in other comprehensive income	(1,363		)	3,959		—			2,596
Purchases, issuances, sales and settlements
Purchases	—			—		118,916			118,916
Issuances	—			—		—			—
Sales	(96,655		)	—		—			(96,655		)
Settlements	(107		)	—		(6,022		)	(6,129		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	2,360		$	189,893	$	290,189		$	482,442
Three Months Ended June 30, 2012
Balance at beginning of period	$	96,655		$	6,215	$	—		$	102,870
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	(548		)	—		—			(548		)
Included in other comprehensive income	(4,032		)	171		—			(3,861		)
Purchases, issuances, sales and settlements
Purchases	—			—		—			—
Issuances	—			—		—			—
Sales	—			—		—			—
Settlements	(39		)	—		—			(39		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	92,036		$	6,386	$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale						Fair Value Option
	Corporate Bonds			Other Investments			Other Investments			Total
Six Months Ended June 30, 2013
Balance at beginning of period	$	98,404		$	184,202		$	195,350		$	477,956
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	4,679			4,762			(1,702		)	7,739
Included in other comprehensive income	(3,051		)	5,871			—			2,820
Purchases, issuances, sales and settlements
Purchases	—			5,000			160,570			165,570
Issuances	—			—			—			—
Sales	(96,655		)	—			—			(96,655		)
Settlements	(1,017		)	(9,942		)	(64,029		)	(74,988		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	2,360		$	189,893		$	290,189		$	482,442
Six Months Ended June 30, 2012
Balance at beginning of period	$	92,091		$	5,124		$	—		$	97,215
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	1,783			81			—			1,864
Included in other comprehensive income	(1,759		)	1,262			—			(497		)
Purchases, issuances, sales and settlements
Purchases	—			—			—			—
Issuances	—			—			—			—
Sales	—			—			—			—
Settlements	(79		)	(81		)	—			(160		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	92,036		$	6,386		$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

The amount of total losses for the 2013 second quarter included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013 was $2.2 million, while the amount of total gains for the six months ended June 30, 2013 included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013 was $4.4 million. The amount of total losses for the 2012 second quarter included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2012 was $0.5 million, while the amount of total gains for the six months ended June 30, 2012 was $1.9 million.

Financial Instruments Disclosed, But Not Carried, At Fair Value

The Company uses various financial instruments in the normal course of its business. The carrying values of cash, accrued investment income, receivable for securities sold, certain other assets, payable for securities purchased and certain other liabilities approximated their fair values at June 30, 2013, due to their respective short maturities. As these financial instruments are not actively traded, their respective fair values are classified within Level 2.

At June 30, 2013, the Company’s senior notes were carried at their cost of $300.0 million and had a fair value of $368.8 million. The fair values of these securities were obtained from a third party pricing service and are based on observable market inputs. As such, the fair values of the senior notes are classified within Level 2.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

9.Derivative Instruments

The Company’s investment strategy allows for the use of derivative securities. The Company’s derivative instruments are recorded on its consolidated balance sheets at fair value. The fair values of those derivatives are based on quoted market prices. All realized and unrealized contract gains and losses are reflected in the Company’s results of operations. The Company utilizes exchange traded U.S. Treasury note, Eurodollar and other futures contracts and commodity futures to manage portfolio duration or replicate investment positions in its portfolios. Certain of the Company’s corporate bonds are managed in a global bond portfolio which incorporates the use of foreign currency forward contracts which are intended to provide an economic hedge against foreign currency movements on the portfolio’s non-U.S. Dollar denominated holdings. The Company routinely utilizes other foreign currency forward contracts, currency options, index futures contracts and other derivatives as part of its total return objective.

In addition, the Company purchases to-be-announced mortgage backed securities (“TBAs”) as part of its investment strategy. TBAs represent commitments to purchase a future issuance of agency mortgage backed securities. For the period between purchase of a TBA and issuance of the underlying security, the Company’s position is accounted for as a derivative. The Company purchases TBAs in both long and short positions to enhance investment performance and as part of its overall investment strategy. The Company did not hold any derivatives which were designated as hedging instruments at June 30, 2013 or December 31, 2012.

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments. The fair value of TBAs is included in “fixed maturities available for sale, at fair value” while the fair value of all other derivatives is included in “other investments available for sale, at fair value” in the consolidated balance sheets.

	Asset Derivatives		Liability Derivatives			Net Derivatives
	Fair Value		Fair Value			Fair Value			Notional Value
June 30, 2013
Futures contracts	$	160	$	(54	)	$	106		$	303,286
Foreign currency forward contracts	15,779		(7,605		)	8,174			887,815
TBAs	436,215		(270,629		)	165,586			687,560
Other	670		(40		)	630			203,466
Total	$	452,824	$	(278,328	)	$	174,496
December 31, 2012
Futures contracts	$	52	$	(52	)	$	—		$	340,400
Foreign currency forward contracts	2,809		(2,678		)	131			396,468
TBAs	23,599		(4,346		)	19,253			26,000
Other	448		(676		)	(228		)	50,341
Total	$	26,908	$	(7,752	)	$	19,156

The Company's derivative instruments are generally traded under master netting agreements, which establish terms that apply to all derivative transactions with a counterparty. In the event of a bankruptcy or other stipulated event of default, such agreements provide that the non-defaulting party may elect to terminate all outstanding derivative transactions, in which case all individual derivative positions (loss or gain) with a counterparty are closed out and netted and replaced with a single amount, usually referred to as the termination amount, which is expressed in a single currency. The resulting single net amount, where positive, is payable to the party "in-the-money" regardless of whether or not it is the defaulting party, unless the parties have agreed that only the non-defaulting party is entitled to receive a termination payment where the net amount is positive and is in its favor. Effectively, contractual close-out netting reduces derivatives credit exposure from gross to net exposure. At June 30, 2013, asset derivatives and liability derivatives of $223.5 million and $76.8 million, respectively, were subject to a master netting agreement, compared to $26.9 million and $7.8 million, respectively, at December 31, 2012. The remaining derivatives included in the table above were not subject to a master netting agreement.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table summarizes net realized gains (losses) recorded on the Company’s derivative instruments in the consolidated statements of income:

	Three Months Ended						Six Months Ended
Derivatives not designated as	June 30,						June 30,
hedging instruments	2013			2012			2013			2012
Futures contracts	$	10,623		$	(2,322	)	$	9,794		$	(4,343	)
Foreign currency forward contracts	7,605			938			6,880			(943		)
TBAs	(3,751		)	1,419			(3,210		)	1,742
Other	1,169			242			1,804			(848		)
Total	$	15,646		$	277		$	15,268		$	(4,392	)

10.Income Taxes

ACGL is incorporated under the laws of Bermuda and, under current Bermuda law, is not obligated to pay any taxes in Bermuda based upon income or capital gains. The Company has received a written undertaking from the Minister of Finance in Bermuda under the Exempted Undertakings Tax Protection Act 1966 that, in the event that any legislation is enacted in Bermuda imposing any tax computed on profits, income, gain or appreciation on any capital asset, or any tax in the nature of estate duty or inheritance tax, such tax will not be applicable to ACGL or any of its operations until March 31, 2035. This undertaking does not, however, prevent the imposition of taxes on any person ordinarily resident in Bermuda or any company in respect of its ownership of real property or leasehold interests in Bermuda.

ACGL and its non-U.S. subsidiaries will be subject to U.S. federal income tax only to the extent that they derive U.S. source income that is subject to U.S. withholding tax or income that is effectively connected with the conduct of a trade or business within the U.S. and is not exempt from U.S. tax under an applicable income tax treaty with the U.S. ACGL and its non-U.S. subsidiaries will be subject to a withholding tax on dividends from U.S. investments and interest from certain U.S. payors (subject to reduction by any applicable income tax treaty). ACGL and its non-U.S. subsidiaries intend to conduct their operations in a manner that will not cause them to be treated as engaged in a trade or business in the United States and, therefore, will not be required to pay U.S. federal income taxes (other than U.S. excise taxes on insurance and reinsurance premium and withholding taxes on dividends and certain other U.S. source investment income). However, because there is uncertainty as to the activities which constitute being engaged in a trade or business within the United States, there can be no assurances that the U.S. Internal Revenue Service will not contend successfully that ACGL or its non-U.S. subsidiaries are engaged in a trade or business in the United States. If ACGL or any of its non-U.S. subsidiaries were subject to U.S. income tax, ACGL’s shareholders’ equity and earnings could be materially adversely affected. ACGL has subsidiaries and branches that operate in various jurisdictions around the world that are subject to tax in the jurisdictions in which they operate. The significant jurisdictions in which ACGL’s subsidiaries and branches are subject to tax are the United States, United Kingdom, Ireland, Canada, Switzerland and Denmark.

The Company’s income tax provision on income before income taxes resulted in an expense of 2.2% for the six months ended June 30, 2013, compared to an expense of 0.7% for the 2012 period. The Company’s effective tax rate, which is based upon the expected annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction. The Company had a net deferred tax asset of $140.7 million at June 30, 2013, compared to $98.6 million at December 31, 2012. In addition, the Company paid$4.8 million in income taxes for the six months ended June 30, 2013, while the Company paid$4.3 million for the 2012 period.

The United States also imposes an excise tax on insurance and reinsurance premiums paid to non-U.S. insurers or reinsurers with respect to risks located in the United States. The Company incurs federal excise taxes on certain of its reinsurance transactions, including amounts ceded through intercompany transactions. The Company incurred $4.3 million of federal excise taxes for the six months ended June 30, 2013, compared to $4.0 million for the 2012 period. Such amounts are reflected as acquisition expenses in the Company’s consolidated statements of income.

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

11.Other Comprehensive Income (Loss)

The following table presents the changes in each component of accumulated other comprehensive income ("AOCI"), net of tax:

	Unrealized Gains on Available-For-Sale Securities			Foreign Currency Translation Adjustments			Total
Three Months Ended June 30, 2013
Beginning balance	$	260,725		$	(31,162	)	$	229,563
Other comprehensive income before reclassifications	(259,562		)	(5,407		)	(264,969		)
Amounts reclassified from accumulated other comprehensive income	(13,916		)	—			(13,916		)
Net current period other comprehensive income (loss)	(273,478		)	(5,407		)	(278,885		)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)
Six Months Ended June 30, 2013
Beginning balance	$	289,957		$	(2,940	)	$	287,017
Other comprehensive income before reclassifications	(250,093		)	(33,629		)	(283,722		)
Amounts reclassified from accumulated other comprehensive income	(52,617		)	—			(52,617		)
Net current period other comprehensive income (loss)	(302,710		)	(33,629		)	$	(336,339	)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)

The following table presents details about amounts reclassified from accumulated other comprehensive income:

		Amounts Reclassed from AOCI
Details About AOCI Components	Consolidated Statement of Income Line Item That Includes Reclassification	Three Months Ended			Six Months Ended
		June 30, 2013			June 30, 2013
Unrealized Gains on Available-For-Sale Securities
	Net realized gains	$	14,634		$	58,999
	Net impairment losses included in earnings	(724		)	(2,970		)
	Total before tax	13,910			56,029
	Income tax benefit (expense)	6			(3,412		)
	Net of tax	$	13,916		$	52,617

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ARCH CAPITAL GROUP LTD. AND SUBSIDIARIES

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)

The following table presents the tax effects allocated to each component of other comprehensive income (loss):

	Before Tax Amount			Tax Expense (Benefit)			Net of Tax Amount
Three Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(281,388	)	$	(21,826	)	$	(259,562	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	—			—			—
Less reclassification of net realized gains included in net income	13,910			(6		)	13,916
Foreign currency translation adjustments	(5,407		)	—			(5,407		)
Other comprehensive income (loss)	$	(300,705	)	$	(21,820	)	$	(278,885	)
Three Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	23,524		$	5,464		$	18,060
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(503		)	—			(503		)
Less reclassification of net realized gains included in net income	45,384			1,592			43,792
Foreign currency translation adjustments	(16,699		)	(1,563		)	(15,136		)
Other comprehensive income (loss)	$	(39,062	)	$	2,309		$	(41,371	)
Six Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(271,043	)	$	(20,952	)	$	(250,091	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(2		)	—			(2		)
Less reclassification of net realized gains included in net income	56,029			3,412			52,617
Foreign currency translation adjustments	(33,627		)	2			(33,629		)
Other comprehensive income (loss)	$	(360,701	)	$	(24,362	)	$	(336,339	)
Six Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	109,241		$	(3,682	)	$	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(511		)	—			(511		)
Less reclassification of net realized gains included in net income	76,143			4,840			71,303
Foreign currency translation adjustments	(2,830		)	(895		)	(1,935		)
Other comprehensive income (loss)	$	29,757		$	(9,417	)	$	39,174

12.Legal Proceedings

The Company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. As of June 30, 2013, the Company was not a party to any litigation or arbitration which is expected by management to have a material adverse effect on the Company’s results of operations and financial condition and liquidity.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS

The following is a discussion and analysis of our financial condition and results of operations. This should be read in conjunction with our consolidated financial statements included in Item 1 of this report and also our Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our Annual Report on Form 10-K for the year ended December 31, 2012 (“2012 Form 10-K”). In addition, readers should review “Risk Factors” set forth in Item 1A of Part I of our 2012 Form 10-K. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

Arch Capital Group Ltd. (“ACGL” and, together with its subsidiaries, “we” or “us”) is a Bermuda public limited liability company with approximately $5.63 billion in capital at June 30, 2013 and, through operations in Bermuda, the United States, Europe and Canada, writes insurance and reinsurance on a worldwide basis. While we are positioned to provide a full range of property and casualty insurance and reinsurance lines, we focus on writing specialty lines of insurance and reinsurance. It is our belief that our underwriting platform, our experienced management team and our strong capital base that is unencumbered by significant pre-2002 risks have enabled us to establish a strong presence in the insurance and reinsurance markets.

Current Outlook

The broad market environment continued to show improvement in the 2013 second quarter as rates rose at roughly the same level as in the first quarter. In our U.S. insurance business, weighted rate increases in the quarter provided 1.5% of expected margin improvement (i.e., rates in excess of loss cost trends) in the 2013 second quarter. These improvements, on a line by line basis, ranged from minus 3% to as high as a positive 11%. In addition, the movement of business from the admitted market to the excess and surplus lines market continues. In March 2013, we expanded our insurance underwriting platform in the excess and surplus lines market by starting a binding authority insurance facility that caters to smaller accounts through the wholesale distribution channel. This group contributed to our 2013 second quarter premiums and is gaining traction across Arch's distribution platform. Notwithstanding the improvement in the rate environment in the 2013 second quarter, on an absolute basis, we believe that longer-tail lines still require significant rate improvement to meet our return objectives. In our reinsurance business, terms and conditions were relatively stable in the 2013 second quarter. Our reinsurance business wrote less property catastrophe business relative to the 2012 second quarter due to rate reductions, a decrease in capacity deployed and an increase use of retrocessions. Our underwriting teams continue to execute a disciplined strategy by emphasizing small and medium-sized accounts over large accounts and focusing more on short-tail business.

Our objective is to achieve an average operating return on average equity of 15% or greater over the insurance cycle, which we believe to be an attractive return to our common shareholders given the risks we assume. We continue to look for opportunities to find acceptable books of business to underwrite without sacrificing underwriting discipline and continue to write a significant portion of our overall book in catastrophe-exposed business which has the potential to increase the volatility of our operating results.

The current economic conditions could continue to have a material impact on the frequency and severity of claims and, therefore, could negatively impact our underwriting returns. In addition, volatility in the financial markets could continue to significantly affect our investment returns, reported results and shareholders’ equity. We consider the potential impact of economic trends in the estimation process for establishing unpaid losses and loss adjustment expenses and in determining our investment strategies.

In addition, the impact of the continuing weakness of the U.S., European countries and other key economies, projected budget deficits for the U.S., European countries and other governments and the consequences associated with possible additional downgrades of securities of the U.S., European countries and other governments by credit rating agencies is inherently unpredictable and could have a material adverse effect on financial markets and economic conditions in the U.S. and throughout the world. In turn, this could have a material adverse effect on our business, financial condition and results of operations and, in particular, this could have a material adverse effect on the value of securities in our investment portfolio.

Natural Catastrophe Risk

We monitor our natural catastrophe risk globally for all perils and regions, in each case, where we believe there is significant exposure. Our models employ both proprietary and vendor-based systems and include cross-line correlations for property, marine, offshore energy, aviation, workers compensation and personal accident. Currently, we seek to limit our 1-in-250 year return period net probable maximum pre-tax loss from a severe catastrophic event in any geographic zone to approximately 25% of total shareholders’ equity. We reserve the right to change this threshold at any time. Based on in-force exposure estimated as of July 1, 2013, our modeled peak zone catastrophe exposure was a windstorm affecting the Northeastern

30

U.S., with a net probable maximum pre-tax loss of $858 million, followed by windstorms affecting the Gulf of Mexico and Florida Tri-County with net probable maximum pre-tax losses of $746 million and $606 million, respectively. Based on in-force exposure estimated as of April 1, 2013, our modeled peak zone exposure was a windstorm affecting the Northeastern U.S., with a net probable maximum pre-tax loss of $886 million, followed by windstorms affecting the Gulf of Mexico and Florida Tri-County with net probable maximum pre-tax losses of $798 million and $582 million, respectively. Our exposures to other perils, such as U.S. earthquake and international events, was less than the exposures arising from U.S. windstorms and hurricanes in both periods. As of July 1, 2013, our modeled peak zone earthquake exposure (New Madrid earthquake) represented less than 50% of our peak zone catastrophe exposure, and our modeled peak zone international exposure (Japan earthquake) was substantially less than both our peak zone windstorm and earthquake exposures. Net probable maximum pre-tax loss estimates are net of expected reinsurance recoveries, before income tax and before excess reinsurance reinstatement premiums. Loss estimates are reflective of the zone indicated and not the entire portfolio. Since hurricanes and windstorms can affect more than one zone and make multiple landfalls, our loss estimates include clash estimates from other zones.

The loss estimates shown above do not represent our maximum exposures and it is highly likely that our actual incurred losses would vary materially from the modeled estimates. There can be no assurances that we will not suffer a net loss greater than 25% of our total shareholders’ equity from one or more catastrophic events due to several factors, including the inherent uncertainties in estimating the frequency and severity of such events and the margin of error in making such determinations resulting from potential inaccuracies and inadequacies in the data provided by clients and brokers, the modeling techniques and the application of such techniques or as a result of a decision to change the percentage of shareholders’ equity exposed to a single catastrophic event. Actual losses may also increase if our reinsurers fail to meet their obligations to us or the reinsurance protections purchased by us are exhausted or are otherwise unavailable. See “Risk Factors—Risk Relating to Our Industry” and “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Natural and Man-Made Catastrophic Events” in our 2012 Form 10-K.

Financial Measures

Management uses the following three key financial indicators in evaluating our performance and measuring the overall growth in value generated for ACGL’s common shareholders:

Book Value per Common Share

Book value per common share represents total common shareholders’ equity divided by the number of common shares outstanding. Management uses growth in book value per common share as a key measure of the value generated for our common shareholders each period and believes that book value per common share is the key driver of ACGL’s share price over time. Book value per common share is impacted by, among other factors, our underwriting results, investment returns and share repurchase activity, which has an accretive or dilutive impact on book value per common share depending on the purchase price. Book value per common share was $36.80 at June 30, 2013, compared to $37.66 at March 31, 2013 and $34.45 at June 30, 2012. The 2.3% reduction in the 2013 second quarter was primarily driven by the impact of rising interest rates and wider credit spreads on our fixed income portfolio which also depressed the growth for the trailing twelve months ended June 30, 2013 to 6.8%.

Operating Return on Average Common Equity

Operating return on average common equity (“Operating ROAE”) represents annualized after-tax operating income available to common shareholders divided by the average of beginning and ending common shareholders’ equity during the period. After-tax operating income available to common shareholders, a “non-GAAP measure” as defined in the SEC rules, represents net income available to common shareholders, excluding net realized gains or losses, net impairment losses recognized in earnings, equity in net income or loss of investment funds accounted for using the equity method and net foreign exchange gains or losses, net of income taxes. Management uses Operating ROAE as a key measure of the return generated to common shareholders and has set an objective to achieve an average Operating ROAE of 15% or greater over the insurance cycle, which it believes to be an attractive return to common shareholders given the risks we assume. See “Comment on Non-GAAP Financial Measures.” Our Operating ROAE was 10.9% for the 2013 second quarter, compared to 12.3% for the 2012 second quarter. The lower Operating ROAE for the 2013 second quarter primarily resulted from a higher level of catastrophic activity compared to the 2012 second quarter.

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Total Return on Investments

Total return on investments includes investment income, equity in net income or loss of investment funds accounted for using the equity method, net realized gains and losses and the change in unrealized gains and losses generated by our investment portfolio. Total return is calculated on a pre-tax basis and before investment expenses and includes the effect of financial market conditions along with foreign currency fluctuations. Management uses total return on investments as a key measure of the return generated to common shareholders on the capital held in the business, and compares the return generated by our investment portfolio against benchmark returns which we measured our portfolio against during the periods. The benchmark return is a weighted average of the benchmarks assigned to each of our investment managers and vary based on the nature of the portfolios under management.

The benchmark return index is a customized combination of indices intended to approximate a target portfolio by asset mix and average credit quality while also matching the approximate estimated duration and currency mix of our insurance and reinsurance liabilities. Although the estimated duration and average credit quality of this index will move as the duration and rating of its constituent securities change, generally we do not adjust the composition of the benchmark return index. The benchmark return index should not be interpreted as expressing a preference for or aversion to any particular sector or sector weight. The index is intended solely to provide, unlike many master indices that change based on the size of their constituent indices, a relatively stable basket of investable indices.

At June 30, 2013, the benchmark return index had an average credit quality of “Aa2” by Moody’s Investors Service (“Moody’s”), an estimated duration of 3.59 years and included weightings to the following indices:

	Weighting
The Bank of America Merrill Lynch 1-10 Year U.S. Treasury & Agency Index	30.875	%
The Bank of America Merrill Lynch 1-10 Year AA U.S. Corporate & Yankees Index	20.875	%
The Bank of America Merrill Lynch U.S. Mortgage Backed Securities Index	11.875	%
Barclays Capital CMBS, AAA Index	10.000	%
The Bank of America Merrill Lynch 1-10 Year U.S. Municipal Securities Index	7.125	%
MSCI World Free Index	5.000	%
The Bank of America Merrill Lynch 0-3 Month U.S. Treasury Bill Index	4.750	%
The Bank of America Merrill Lynch U.S. High Yield Constrained Index	2.375	%
Barclays Capital U.S. High-Yield Corporate Loan Index	2.375	%
The Bank of America Merrill Lynch 1-10 Year U.K. Gilt Index	2.375	%
The Bank of America Merrill Lynch 1-10 Year Euro Government Index	2.375	%
Total	100.000	%

The following table summarizes the pre-tax total return (before investment expenses) of our investment portfolio compared to the benchmark return against which we measured our portfolio during the periods:

	Arch Portfolio		Benchmark Return
Pre-tax total return (before investment expenses):
2013 second quarter	(1.59	)%	(1.43	)%
2012 second quarter	0.63	%	0.86	%
Six Months Ended June 30, 2013	(1.11	)%	(0.97	)%
Six Months Ended June 30, 2012	2.53	%	2.43	%

Total return for the 2013 periods reflected the impact of both higher interest rates and wider credit spreads in the 2013 second quarter, offset somewhat by the positive returns of our equity and alternatives portfolios. Excluding foreign exchange, total return was (1.56)% for the 2013 second quarter, compared to 1.04% for the 2012 second quarter, and (0.57)% for the six months ended June 30, 2013, compared to 2.66% for the 2012 period.

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Comment on Non-GAAP Financial Measures

Throughout this filing, we present our operations in the way we believe will be the most meaningful and useful to investors, analysts, rating agencies and others who use our financial information in evaluating the performance of our company. This presentation includes the use of after-tax operating income available to common shareholders, which is defined as net income available to common shareholders, excluding net realized gains or losses, net impairment losses recognized in earnings, equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses and loss on repurchase of preferred shares, net of income taxes. The presentation of after-tax operating income available to common shareholders is a “non-GAAP financial measure” as defined in Regulation G. The reconciliation of such measure to net income available to common shareholders (the most directly comparable GAAP financial measure) in accordance with Regulation G is included under “Results of Operations” below.

We believe that net realized gains or losses, net impairment losses recognized in earnings, equity in net income or loss of investment funds accounted for using the equity method and net foreign exchange gains or losses in any particular period are not indicative of the performance of, or trends in, our business. Although net realized gains or losses, net impairment losses recognized in earnings, equity in net income or loss of investment funds accounted for using the equity method and net foreign exchange gains or losses are an integral part of our operations, the decision to realize investment gains or losses, the recognition of the change in the carrying value of investments accounted for using the fair value option in net realized gains or losses, the recognition of net impairment losses, the recognition of equity in net income or loss of investment funds accounted for using the equity method and the recognition of foreign exchange gains or losses are independent of the insurance underwriting process and result, in large part, from general economic and financial market conditions. Furthermore, certain users of our financial information believe that, for many companies, the timing of the realization of investment gains or losses is largely opportunistic. In addition, net impairment losses recognized in earnings on our investments represent other-than-temporary declines in expected recovery values on securities without actual realization. The use of the equity method on certain of our investments in certain funds that invest in fixed maturity securities is driven by the ownership structure of such funds (either limited partnerships or limited liability companies). In applying the equity method, these investments are initially recorded at cost and are subsequently adjusted based on our proportionate share of the net income or loss of the funds (which include changes in the market value of the underlying securities in the funds). This method of accounting is different from the way we account for our other fixed maturity securities and the timing of the recognition of equity in net income or loss of investment funds accounted for using the equity method may differ from gains or losses in the future upon sale or maturity of such investments. The loss on repurchase of preferred shares related to the redemption of the Series A and B preferred shares in April 2012 and had no impact on total shareholders' equity or cash flows. Due to these reasons, we exclude net realized gains or losses, net impairment losses recognized in earnings, equity in net income or loss of investment funds accounted for using the equity method, net foreign exchange gains or losses and loss on repurchase of preferred shares from the calculation of after-tax operating income available to common shareholders.

We believe that showing net income available to common shareholders exclusive of the items referred to above reflects the underlying fundamentals of our business since we evaluate the performance of and manage our business to produce an underwriting profit. In addition to presenting net income available to common shareholders, we believe that this presentation enables investors and other users of our financial information to analyze our performance in a manner similar to how management analyzes performance. We also believe that this measure follows industry practice and, therefore, allows the users of financial information to compare our performance with our industry peer group. We believe that the equity analysts and certain rating agencies which follow us and the insurance industry as a whole generally exclude these items from their analyses for the same reasons.

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RESULTS OF OPERATIONS

The following table summarizes, on an after-tax basis, our consolidated financial data, including a reconciliation of after-tax operating income available to common shareholders to net income available to common shareholders:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
After-tax operating income available to common shareholders	$	135,021		$	141,400		$	293,769		$	255,060
Net realized gains, net of tax	13,779			33,275			68,702			74,148
Net impairment losses recognized in earnings, net of tax	(724		)	(1,951		)	(2,970		)	(2,974		)
Equity in net income of investment funds accounted for using the equity method, net of tax	10,941			7,787			24,764			32,613
Net foreign exchange gains, net of tax	12,438			32,108			38,182			11,567
Loss on repurchase of preferred shares, net of tax	—			(10,612		)	—			(10,612		)
Net income available to common shareholders	$	171,455		$	202,007		$	422,447		$	359,802

Segment Information

We classify our businesses into two underwriting segments — insurance and reinsurance — and corporate and other (non-underwriting). Management measures segment performance based on underwriting income or loss. We do not manage our assets by segment and, accordingly, investment income is not allocated to each underwriting segment. In addition, other revenue and expense items are not evaluated by segment.

Insurance Segment

The following table sets forth our insurance segment’s underwriting results:

	Three Months Ended June 30,								Six Months Ended June 30,
	2013			2012			% Change		2013			2012			% Change
Gross premiums written	$	703,904		$	676,090		4.1		$	1,392,721		$	1,364,203		2.1
Net premiums written	501,568			464,584			8.0		1,006,118			955,264			5.3
Net premiums earned	$	458,656		$	446,594		2.7		$	903,621		$	888,334		1.7
Fee income	529			628					1,054			1,158
Losses and loss adjustment expenses	(291,192		)	(290,416		)			(574,659		)	(593,580		)
Acquisition expenses, net	(74,249		)	(76,058		)			(145,007		)	(149,928		)
Other operating expenses	(80,167		)	(76,617		)			(156,482		)	(149,987		)
Underwriting income (loss)	$	13,577		$	4,131		228.7		$	28,527		$	(4,003	)	n/m
Underwriting Ratios							% Point Change								% Point Change
Loss ratio	63.5		%	65.0		%	(1.5	)	63.6		%	66.8		%	(3.2	)
Acquisition expense ratio (1)	16.1		%	16.9		%	(0.8	)	15.9		%	16.7		%	(0.8	)
Other operating expense ratio	17.5		%	17.2		%	0.3		17.3		%	16.9		%	0.4
Combined ratio	97.1		%	99.1		%	(2.0	)	96.8		%	100.4		%	(3.6	)

_________________________________________________

(1)     The acquisition expense ratio is adjusted to include certain fee income.

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Premiums Written.

The following table sets forth our insurance segment’s net premiums written by major line of business:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	Amount		%	Amount		%	Amount		%	Amount		%
Programs	$	122,981	25	$	92,998	20	$	223,496	22	$	174,614	18
Property, energy, marine and aviation	81,675		16	86,390		19	165,286		16	166,209		17
Professional liability	66,148		13	65,198		14	121,922		12	135,759		14
Executive assurance	43,721		9	60,205		13	104,073		10	128,583		13
Construction	55,418		11	49,784		11	97,630		10	83,437		9
National accounts	13,642		3	4,961		1	58,758		6	40,399		4
Casualty	26,237		5	30,638		7	50,032		5	57,611		6
Lenders products	22,840		5	20,477		4	44,513		4	42,892		4
Travel and accident	16,758		3	20,294		4	33,215		3	43,130		5
Surety	17,501		3	12,723		3	32,757		3	24,857		3
Healthcare	10,374		2	7,959		2	20,020		2	18,594		2
Other (1)	24,273		5	12,957		2	54,416		7	39,179		5
Total	$	501,568	100	$	464,584	100	$	1,006,118	100	$	955,264	100

_________________________________________________

(1) Includes alternative markets, contract binding, accident and health and excess workers’ compensation business.

2013 second quarter versus 2012. Net premiums written were 8.0%higher than in the 2012 second quarter with increases in programs, national accounts, contract binding (launched in early 2013) and construction lines, partially offset by a reduction in executive assurance premiums. The increase in program business resulted from a mix of underlying exposure growth within existing programs, new business and rate increases. The increase in national accounts primarily resulted from new business and rate increases, while the growth in construction reflected a higher net retention. The decrease in executive assurance, primarily in the insurance segment's U.K. operations, reflected lower participation on certain accounts due to the lack of favorable rate movements.

Six Months Ended June 30, 2013 versus 2012. Net premiums written were 5.3%higher than in the 2012 period with increases in programs, national accounts, construction, accident and health and contract binding lines, partially offset by reduction in executive assurance and professional liability premiums. The increase in program business resulted from a mix of underlying exposure growth within existing programs, new business and rate increases. The increase in national accounts primarily resulted from new business and rate increases, while the growth in construction reflected a higher net retention. The decrease in executive assurance and professional liability, primarily in the insurance segment's U.K. operations, reflected lower participation on certain accounts due to the lack of favorable rate movements.

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Net Premiums Earned.

The following table sets forth our insurance segment’s net premiums earned by major line of business:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	Amount		%	Amount		%	Amount		%	Amount		%
Programs	$	99,721	22	$	80,589	18	$	189,644	21	$	154,587	17
Property, energy, marine and aviation	71,978		16	77,590		17	149,983		17	156,084		18
Professional liability	59,397		13	68,017		15	118,054		13	131,273		15
Executive assurance	55,540		12	60,856		14	113,694		13	119,622		13
Construction	37,251		8	31,692		7	72,490		8	63,500		7
National accounts	23,942		5	18,415		4	45,585		5	37,551		4
Casualty	24,461		5	28,102		6	50,284		6	57,167		6
Lenders products	20,855		5	21,411		5	41,812		5	53,564		6
Travel and accident	17,893		4	20,661		5	30,798		3	37,374		4
Surety	14,306		3	10,798		2	27,489		3	21,358		2
Healthcare	9,442		2	9,077		2	18,449		2	17,975		2
Other (1)	23,870		5	19,386		5	45,339		4	38,279		6
Total	$	458,656	100	$	446,594	100	$	903,621	100	$	888,334	100

_________________________________________________

(1) Includes alternative markets, contract binding, accident and health and excess workers’ compensation business.

Net premiums written are primarily earned on a pro rata basis over the terms of the policies for all products, usually 12 months. Net premiums earned reflect changes in net premiums written over the previous five quarters.

Losses and Loss Adjustment Expenses.

The table below shows the components of the insurance segment’s loss ratio:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Current year	67.0	%	68.9	%	65.9	%	68.8	%
Prior period reserve development	(3.5	)%	(3.9	)%	(2.3	)%	(2.0	)%
Loss ratio	63.5	%	65.0	%	63.6	%	66.8	%

Current Year Loss Ratio.

The insurance segment’s current year loss ratio was 1.9 points lower in the 2013 second quarter compared to the 2012 second quarter and 2.9 points lower for the six months ended June 30, 2013 than in the 2012 period. The 2013 second quarter loss ratio reflected 1.5 points of current year catastrophic activity, primarily related to U.S. tornado and hailstorm events, while catastrophic activity for the 2012 second quarter was minimal. The loss ratio for the six months ended June 30, 2013 reflected 0.7 points of catastrophic activity, compared to 0.5 points for the 2012 period. The loss ratios for the 2013 periods reflected a lower level of large attritional loss activity than in the 2012 periods and also reflected changes in the mix of business earned.

Prior Period Reserve Development.

2013 second quarter: The insurance segment’s net favorable development of $16.0 million, or 3.5 points, consisted of $11.7 million of net favorable development in short-tailed lines and $4.3 million of net favorable development in medium-tailed and long-tailed lines. Favorable development in short-tailed lines primarily consisted of reductions in property (including special risk other than marine) reserves from the 2008 to 2011 accident years (i.e., the year in which a loss occurred), primarily due to varying levels of reported claims activity. Development on the 2005 to 2012 named catastrophic events was favorable by $7.2 million in the quarter. Net favorable development in medium-tailed and long-tailed lines reflected a reduction of $8.2 million in marine reserves, $3.1 million of favorable development in healthcare reserves and $2.0 million in national accounts, all spread across various accident years. Such amounts were partially offset by a net increase of $4.1 million in professional liability and executive assurance reserves, primarily from a small number of claims in the 2006 accident year, and $5.8 million in casualty reserves, primarily from the 2012 accident year on certain Canadian captive business which has been non-renewed.

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2012 second quarter: The insurance segment’s net favorable development of $17.2 million, or 3.9 points, consisted of net favorable development of $16.2 million in short-tailed lines and $11.4 million in medium-tailed lines, partially offset by net adverse development of $10.4 million in long-tailed lines. Favorable development in short-tailed lines primarily consisted of reductions in property (including special risk other than marine) reserves from the 2010 and 2011 accident years, primarily due to varying levels of reported claims activity, while favorable development in medium-tailed lines reflected reductions in professional liability reserves, primarily from the 2009 accident year, in healthcare reserves, across most accident years, and in surety reserves, primarily from the 2007 and 2008 accident years. Net adverse development in long-tailed lines included a net increase of $6.9 million in construction reserves, primarily from the 2007 and 2008 accident years, and $4.8 million in executive assurance reserves in the 2011 accident year, primarily due to an increase in loss picks in reaction to claims development.

Six Months Ended June 30, 2013: The insurance segment’s net favorable development of $21.0 million, or 2.3 points, consisted of $27.8 million of net favorable development in short-tailed lines, partially offset by $6.8 million of net adverse development in medium-tailed and long-tailed lines. Favorable development in short-tailed lines primarily consisted of reductions in property (including special risk other than marine) reserves from the 2009 to 2011 accident years, primarily due to varying levels of reported claims activity. Development on the 2005 to 2012 named catastrophic events was favorable by $8.6 million in the period. Net adverse development in medium-tailed and long-tailed lines included an increase of $10.4 million in casualty reserves, primarily related to claims from the two most recent accident years on certain Canadian accounts which have been non-renewed, a net increase of $7.9 million in professional liability and executive assurance reserves, primarily from a small number of claims in the 2006 accident year. Such amounts were partially offset by favorable development of $7.5 million in healthcare reserves, $4.5 million in marine, and $4.2 million in national accounts, all spread across various accident years.

Six Months Ended June 30, 2012: The insurance segment’s net favorable development of $17.7 million, or 2.0 points, consisted of net favorable development of $37.4 million in short-tailed lines and $13.8 million in medium-tailed lines, partially offset by net adverse development of $33.5 million in long-tailed lines. Favorable development in short-tailed lines primarily consisted of reductions in property (including special risk other than marine) reserves from the 2007 to 2011 accident years, primarily due to varying levels of reported claims activity, while favorable development in medium-tailed lines reflected reductions in healthcare reserves across most accident years, and in professional liability reserves, primarily from the 2009 accident year. Net adverse development in long-tailed lines included a net increase of $15.8 million in executive assurance reserves, primarily due to a small number of international D&O claims in more recent accident years, $11.3 million in casualty reserves, primarily from the 2004 to 2008 accident years, and $8.2 million in construction reserves, primarily from the 2007 to 2009 accident years.

Underwriting Expenses.

2013 second quarter versus 2012: The insurance segment’s underwriting expense ratio was 33.6% in the 2013 second quarter, compared to 34.1% in the 2012 second quarter. The acquisition expense ratio was 16.1% in the 2013 second quarter, compared to 16.9% in the 2012 second quarter. The comparison of the 2013 second quarter and 2012 second quarter acquisition expense ratios is influenced by, among other things, the mix and type of business written and earned and the level of ceding commissions. In addition, the 2013 second quarter acquisition expense ratio included 0.5 points of commission expense related to development in prior year loss reserves, compared to 0.1 point in the 2012 second quarter. The other operating expense ratio was 17.5% for the 2013 second quarter, compared to 17.2% for the 2012 second quarter. The 2013 second quarter operating expense ratio reflected a higher level of aggregate expenses than in the 2012 second quarter due, in part, to selected expansion of the insurance segment's operating platform and increased share based compensation costs.

Six Months Ended June 30, 2013 versus 2012: The insurance segment’s underwriting expense ratio was 33.2% for the 2013 period, compared to 33.6% for the 2012 period. The acquisition expense ratio was 15.9% for the 2013 period, compared to 16.7% for the 2012 period. The acquisition expense ratio for the 2013 period included 0.2 points of commission expense related to development in prior year loss reserves, compared to 0.5 points in the 2012 second quarter. The other operating expense ratio was 17.3% for the 2013 period, compared to 16.9% for the 2012 period. The operating expense ratio for the 2013 period reflected a higher level of aggregate expenses than in the 2012 period due, in part, to selected expansion of the insurance segment's operating platform and increased share based compensation costs.

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Reinsurance Segment

The following table sets forth our reinsurance segment’s underwriting results:

	Three Months Ended June 30,								Six Months Ended June 30,
	2013			2012			% Change		2013			2012			% Change
Gross premiums written	$	337,642		$	376,981		(10.4	)	$	813,847		$	756,957		7.5
Net premiums written	308,967			355,649			(13.1	)	757,193			728,580			3.9
Net premiums earned	$	300,160		$	280,062		7.2		$	607,965		$	518,634		17.2
Fee income	373			178					386			191
Losses and loss adjustment expenses	(127,461		)	(109,277		)			(243,397		)	(201,320		)
Acquisition expenses, net	(57,428		)	(52,231		)			(114,262		)	(97,323		)
Other operating expenses	(33,192		)	(29,140		)			(66,792		)	(55,263		)
Underwriting income	$	82,452		$	89,592		(8.0	)	$	183,900		$	164,919		11.5
Underwriting Ratios							% Point Change								% Point Change
Loss ratio	42.5		%	39.0		%	3.5		40.0		%	38.8		%	1.2
Acquisition expense ratio	19.1		%	18.6		%	0.5		18.8		%	18.8		%	—
Other operating expense ratio	11.1		%	10.4		%	0.7		11.0		%	10.7		%	0.3
Combined ratio	72.7		%	68.0		%	4.7		69.8		%	68.3		%	1.5

Premiums Written.

The following table sets forth our reinsurance segment’s net premiums written by major line of business:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	Amount		%	Amount		%	Amount		%	Amount		%
Other specialty (1)	$	61,480	20	$	73,590	21	$	192,817	25	$	168,873	23
Property catastrophe	99,874		32	129,224		36	177,016		23	215,798		30
Property excluding property catastrophe (2)	62,938		20	65,734		19	151,998		20	141,227		19
Casualty (3)	51,502		17	42,373		12	148,747		20	126,512		17
Marine and aviation	14,319		5	18,842		5	37,461		5	44,459		6
Other (4)	18,854		6	25,886		7	49,154		7	31,711		5
Total	$	308,967	100	$	355,649	100	$	757,193	100	$	728,580	100
Pro rata	$	115,105	37	$	144,133	41	$	302,956	40	$	268,879	37
Excess of loss	193,862		63	211,516		59	454,237		60	459,701		63
Total	$	308,967	100	$	355,649	100	$	757,193	100	$	728,580	100

_________________________________________________

(1) Includes U.K. motor, trade credit, surety, workers’ compensation catastrophe, accident and health and other.

(2) Includes facultative business.

(3) Includes professional liability, executive assurance and healthcare business.

(4) Includes mortgage, life, casualty clash and other.

2013 second quarter versus 2012. Net premiums written were 13.1%lower than in the 2012 second quarter, reflecting lower contributions from property catastrophe, other specialty and mortgage business, partially offset by growth in casualty business which primarily resulted from new multi-line and professional liability contracts written in the period. The reduction in property catastrophe business was due to rate reductions as well as to a targeted reduction in the utilization of limits in reaction to changing market conditions and an increase in the usage of retrocessional protection. The decline in other specialty lines included a targeted reduction in our participation on the renewal of a U.K. motor proportional treaty, reductions in premium estimates and non-renewals of certain accident and health treaties and a lower level of recorded mortgage premium. The reduction in recorded mortgage business was due to the fact that the 2012 second quarter reflected a $10.1 million incoming portfolio of mortgage business while the 2013 second quarter reflected no comparable activity.

Six Months Ended June 30, 2013 versus 2012. Net premiums written were 3.9%higher than in the 2012 period, reflecting increases in other specialty, casualty and mortgage business, partially offset by reductions in property catastrophe business. The

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growth in other specialty business resulted from renewals of the credit and surety business acquired from Ariel Reinsurance Company Ltd. ("Ariel") in April 2012 while the growth in casualty business primarily resulted from new multi-line and professional liability contracts written in the period. The reduction in property catastrophe business was due to rate reductions as well as to a targeted reduction in the utilization of limits in reaction to changing market conditions and an increase in the usage of retrocessional protection.

Net Premiums Earned.

The following table sets forth our reinsurance segment’s net premiums earned by major line of business:

	Three Months Ended June 30,						Six Months Ended June 30,
	2013			2012			2013			2012
	Amount		%	Amount		%	Amount		%	Amount		%
Other specialty (1)	$	79,508	26	$	79,855	29	$	169,101	28	$	126,052	24
Property catastrophe	63,332		21	68,992		25	127,565		21	130,855		25
Property excluding property catastrophe (2)	66,980		22	58,720		21	131,882		22	120,352		23
Casualty (3)	54,922		18	46,917		17	109,927		18	92,811		18
Marine and aviation	20,392		7	19,200		7	40,496		7	40,649		8
Other (4)	15,026		6	6,378		1	28,994		4	7,915		2
Total	$	300,160	100	$	280,062	100	$	607,965	100	$	518,634	100
Pro rata	$	141,625	47	$	124,941	45	$	295,806	49	$	224,866	43
Excess of loss	158,535		53	155,121		55	312,159		51	293,768		57
Total	$	300,160	100	$	280,062	100	$	607,965	100	$	518,634	100

_________________________________________________

(1) Includes U.K. motor, trade credit, surety, workers’ compensation catastrophe, accident and health and other.

(2) Includes facultative business.

(3) Includes professional liability, executive assurance and healthcare business.

(4) Includes mortgage, life, casualty clash and other.

Net premiums written, irrespective of the class of business, are generally earned on a pro rata basis over the terms of the underlying policies or reinsurance contracts. Net premiums earned reflect changes in net premiums written over the previous five quarters, including the mix and type of business written. Net premiums earned also included $5 million for the 2013 second quarter and $17 million for the six months ended June 30, 2013 related to the credit and surety business acquired from Ariel with remaining acquired unearned premiums of approximately $16 million at June 30, 2013.

Losses and Loss Adjustment Expenses.

The table below shows the components of the reinsurance segment’s loss ratio:

	Three Months Ended				Six Months Ended
	June 30,				June 30,
	2013		2012		2013		2012
Current year	60.3	%	55.6	%	56.9	%	58.0	%
Prior period reserve development	(17.8	)%	(16.6	)%	(16.9	)%	(19.2	)%
Loss ratio	42.5	%	39.0	%	40.0	%	38.8	%

Current Year Loss Ratio.

The reinsurance segment’s current year loss ratio was 4.7 points higher in the 2013 second quarter compared to the 2012 second quarter and 1.1 points lower for the six months ended June 30, 2013 than in the 2012 period. The 2013 second quarter loss ratio reflected 9.9 points related to current year catastrophic activity, primarily related to U.S. tornado and hailstorm events and flooding in Europe and Canada, while the 2012 second quarter ratio included 2.8 points of catastrophic activity. The loss ratio for the six months ended June 30, 2013 reflected 6.7 points of catastrophic activity, compared to 4.9 points for the 2012 period. The current year loss ratio for the 2013 periods also reflect changes in the mix of business earned including a higher contribution from mortgage business when compared to the 2012 periods.

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Prior Period Reserve Development.

2013 second quarter: The reinsurance segment’s net favorable development of $53.5 million, or 17.8 points, consisted of $27.7 million from long-tailed lines, $22.9 million from short-tailed lines and $2.9 million from medium-tailed lines. Favorable development in long-tailed lines reflected reductions in casualty reserves, primarily from the 2002 to 2006 underwriting years (i.e., all premiums and losses attributable to contracts having an inception or renewal date within the given twelve-month period) based on due to varying levels of reported and paid claims activity. Favorable development in short-tailed lines included $23.8 million from property catastrophe and property other than property catastrophe reserves, primarily from the 2010 to 2012 underwriting years. Contained within this release was favorable development from the 2005 to 2012 named catastrophic events of $7.2 million. The net reduction of loss estimates for the reinsurance segment's short-tailed lines primarily resulted from varying levels of reported and paid claims activity than previously anticipated which led to decreases in certain loss ratio selections during the period.

2012 second quarter: The reinsurance segment’s net favorable development of $46.6 million, or 16.6 points, consisted of $28.9 million from short-tailed lines and $17.7 million of net favorable development from medium-tailed and long-tailed lines. Favorable development in short-tailed lines included $25.7 million from property catastrophe and property other than property catastrophe reserves, primarily from the 2009 to 2011 underwriting years. The net reduction of loss estimates for the reinsurance segment's short-tailed lines primarily resulted from varying levels of reported and paid claims activity than previously anticipated which led to decreases in certain loss ratio selections during the period. Net favorable development of $17.7 million in medium-tailed and long-tailed lines included reductions in casualty reserves of $9.9 million, primarily from the 2002 to 2006 underwriting years, and $7.5 million in marine and aviation reserves, spread across various underwriting years.

Six Months Ended June 30, 2013: The reinsurance segment’s net favorable development of $102.9 million, or 16.9 points, consisted of $58.0 million of net favorable development in short-tailed lines, $36.3 million from long-tailed lines and $8.6 million from medium-tailed lines. Favorable development in short-tailed lines included $69.0 million from property catastrophe and property other than property catastrophe reserves, primarily from the 2010 to 2012 underwriting years. Contained within this release was favorable development from the 2005 to 2012 named catastrophic events of $19.2 million. The net reduction of loss estimates for the reinsurance segment's short-tailed lines primarily resulted from varying levels of reported and paid claims activity than previously anticipated which led to decreases in certain loss ratio selections during the period. Such amounts were partially offset by an increase in estimates for U.S. crop hail losses of $10.1 million. Favorable development in long-tailed lines reflected reductions in casualty reserves, primarily from the 2002 to 2006 underwriting years based on varying levels of reported and paid claims activity, while favorable development in medium-tailed lines was across most underwriting years.

Six Months Ended June 30, 2012: The reinsurance segment’s net favorable development of $99.4 million, or 19.2 points, consisted of $60.1 million from short-tailed lines and $39.3 million of net favorable development from medium-tailed and long-tailed lines. Favorable development in short-tailed lines included $47.1 million from property catastrophe and property other than property catastrophe reserves, primarily from the 2009 to 2011 underwriting years. The net reduction of loss estimates for the reinsurance segment's short-tailed lines primarily resulted from varying levels of reported and paid claims activity than previously anticipated which led to decreases in certain loss ratio selections during the period. Net favorable development of $39.3 million in medium-tailed and long-tailed lines included reductions in casualty reserves of $30.6 million, primarily from the 2003 to 2006 underwriting years, and $8.5 million in marine and aviation reserves, spread across various underwriting years.

Underwriting Expenses.

2013 second quarter versus 2012: The underwriting expense ratio for the reinsurance segment was 30.2% in the 2013 second quarter, compared to 29.0% in the 2012 second quarter. The acquisition expense ratio for the 2013 second quarter was 19.1%, compared to 18.6% for the 2012 second quarter. The comparison of the 2013 second quarter and 2012 second quarter acquisition expense ratios is influenced by, among other things, the mix and type of business written and earned and the level of ceding commissions. In addition, the 2013 second quarter acquisition expense ratio included a reduction of 0.6 points of commission expense related to development in prior year loss reserves, compared to an increase of 0.3 points in the 2012 second quarter. The operating expense ratio for the 2013 second quarter was 11.1%, compared to 10.4% in the 2012 second quarter. The 2013 second quarter operating expense ratio reflected an increase in aggregate expenses due, in part, to selected expansion of the reinsurance segment’s operating platform and increased share based compensation costs.

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Six Months Ended June 30, 2013 versus 2012: The reinsurance segment’s underwriting expense ratio was 29.8% for the 2013 period, compared to 29.5% for the 2012 period. The acquisition expense ratio was 18.8% for the 2013 period, compared to 18.8% for the 2012 period. The acquisition expense ratio for the 2013 period included a reduction of 0.1 points of commission expense related to development in prior year loss reserves, compared to an increase of 0.4 points in the 2012 second quarter. The other operating expense ratio was 11.0% for the 2013 period, compared to 10.7% for the 2012 period. The operating expense ratio for the 2013 period reflected a higher level of aggregate expenses than in the 2012 period due, in part, to selected expansion of the reinsurance segment's operating platform and increased share based compensation costs.

Other Income or Expense Items

Net Investment Income. The components of net investment income were derived from the following sources:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities	$	62,004		$	70,290		$	124,010		$	143,740
Term loan investments (1)	6,026			3,557			10,243			5,856
Equity securities	3,164			2,425			4,587			4,089
Short-term investments	364			760			756			1,132
Other (2)	4,734			2,980			11,033			6,173
Gross investment income	76,292			80,012			150,629			160,990
Investment expenses (3)	(7,923		)	(6,404		)	(16,588		)	(13,085		)
Net investment income	$	68,369		73,608			$	134,041		147,905

_________________________________________________

(1) Included in “investments accounted for using the fair value option” on the consolidated balance sheets.

(2) Amounts include dividends on investment funds and other items.

(3) Investment expenses were approximately 0.26% of average invested assets for the 2013 second quarter, compared to 0.21% for the 2012 second quarter, and 0.28% for the six months ended June 30, 2013, compared to 0.22% for the 2012 period.

The pre-tax investment income yield, calculated based on amortized cost and on an annualized basis, was 2.20% for the 2013 second quarter, compared to 2.20% for the 2013 first quarter and 2.47% for the 2012 second quarter. The pre-tax investment income yield was 2.20% for the six months ended June 30, 2013, compared to 2.49% for the 2012 period. The lower yields in the 2013 periods compared to the 2012 periods reflect the effects of the effects of lower reinvestment yields, higher investment expenses and the impact of inflation adjustments on U.S. Treasury Inflation-Protected Securities. In addition, the decline in the 2013 periods also reflects our investment strategy which puts a priority on total return and the use of funds to repurchase shares. Yields on future investment income may vary based on financial market conditions, investment allocation decisions and other factors.

Other Income (Loss). We record income or loss from our investments in Aeolus LP and Gulf Reinsurance Limited (joint venture) using the equity method on a three month lag basis based on the availability of their financial statements. We recorded income of $0.8 million on such investments in the 2013 second quarter, compared to $0.7 million in the 2012 second quarter, and $2.1 million for the six months ended June 30, 2013, compared to a loss of $7.4 million for the 2012 period. The amounts recorded for the 2013 periods primarily related to Gulf Reinsurance Limited. while the amount recorded in the six months ended June 30, 2012 was primarily related to Aeolus LP, which is in runoff. The carrying value of our remaining investment in Aeolus LP at June 30, 2013 was $3.3 million.

Equity in Net Income of Investment Funds Accounted for Using the Equity Method. We recorded $10.9 million of equity in net income related to investment funds accounted for using the equity method in the 2013 second quarter, compared to $7.8 million for the 2012 second quarter, and $24.8 million for the six months ended June 30, 2013, compared to $32.6 million for the 2012 period. We use the equity method on certain investments (which primarily invest in fixed maturity securities) due to the ownership structure of these investment funds, where we do not have a controlling interest and are not the primary beneficiary. In applying the equity method, these investments are initially recorded at cost and are subsequently adjusted based on our proportionate share of the net income or loss of the funds (which include changes in the market value of the underlying securities in the funds). Such investments, which are typically structured as limited partnerships, are generally recorded on a one month lag with some investments reported on a three month lag based on the availability of reports from the investment funds. Certain of these funds employ leverage to achieve a higher rate of return on their assets under management. While leverage presents opportunities for increasing the total return of such investments, it may increase losses as well. Fluctuations in the carrying value of the investment funds accounted for using the equity method may increase the volatility of our reported results of operations. Investment funds accounted for using the equity method totaled $208.8 million at June 30, 2013,

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compared to $307.1 million at December 31, 2012. The lower level at June 30, 2013 primarily resulted from the sale of one investment during the period.  

Net Realized Gains or Losses. We recorded net realized gains of $12.7 million for the 2013 second quarter, compared to net realized gains of $34.9 million for the 2012 second quarter, and net realized gains of $71.0 million for the six months ended June 30, 2013, compared to net realized gains of $79.0 million for the 2012 period. Currently, our portfolio is actively managed to maximize total return within certain guidelines. In assessing returns under this approach, we include net investment income, net realized gains and losses and the change in unrealized gains and losses generated by our investment portfolio. The effect of financial market movements on the investment portfolio will directly impact net realized gains and losses as the portfolio is adjusted and rebalanced. Net realized gains or losses from the sale of fixed maturities primarily resulted from our decisions to reduce credit exposure, to change duration targets, to rebalance our portfolios or due to relative value determinations. In addition, net realized gains or losses include changes in the fair value of assets and liabilities accounted for using the fair value option. See note 7, “Investment Information—Net Realized Gains (Losses),” of the notes accompanying our consolidated financial statements for additional information.

Net Impairment Losses Recognized in Earnings. On a quarterly basis, we perform reviews of our available for sale investments to determine whether declines in fair value below the cost basis are considered other-than-temporary in accordance with applicable accounting guidance regarding the recognition and presentation of other-than-temporary impairments. The process of determining whether a security is other-than-temporarily impaired requires judgment and involves analyzing many factors. These factors include (i) an analysis of the liquidity, business prospects and overall financial condition of the issuer, (ii) the time period in which there was a significant decline in value, (iii) the significance of the decline, and (iv) the analysis of specific credit events. We evaluate the unrealized losses of our equity securities by issuer and determine if we can forecast a reasonable period of time by which the fair value of the securities would increase and we would recover our cost. If we are unable to forecast a reasonable period of time in which to recover the cost of our equity securities, we record a net impairment loss in earnings equivalent to the entire unrealized loss. We recorded $0.7 million of credit related impairments in earnings for the 2013 second quarter, compared to $2.0 million for the 2012 second quarter, and $3.0 million for the six months ended June 30, 2013, compared to $3.0 million for the 2012 period. The OTTI recorded in the 2013 periods primarily resulted from equity securities following a review of available positive and negative evidence. See note 7, “Investment Information—Other-Than-Temporary Impairments,” of the notes accompanying our consolidated financial statements for additional information.

Other Expenses. Other expenses, which are included in our other operating expenses and part of corporate and other (non-underwriting), were $14.0 million for the 2013 second quarter, compared to $11.9 million for the 2012 second quarter, and $24.3 million for the six months ended June 30, 2013, compared to $18.9 million for the 2012 period. Such amounts primarily represent certain holding company costs necessary to support our worldwide insurance and reinsurance operations, share based compensation expense and costs associated with operating as a publicly traded company. The higher level of expenses in the 2013 periods primarily reflected increased compensation costs.

Net Foreign Exchange Gains or Losses. Net foreign exchange gains for the 2013 second quarter were $13.8 million (net unrealized gains of $21.6 million and net realized losses of $7.8 million), compared to net foreign exchange gains for the 2012 second quarter of $31.7 million (net unrealized gains of $32.4 million and net realized losses of $0.7 million). Net foreign exchange gains for the six months ended June 30, 2013 were $38.1 million (net unrealized gains of $47.5 million and net realized losses of $9.4 million), compared to net foreign exchange gains for the 2012 period of $11.0 million (net unrealized gains of $12.2 million and net realized losses of $1.2 million). Net unrealized foreign exchange gains or losses result from the effects of revaluing the Company's net insurance liabilities required to be settled in foreign currencies at each balance sheet date. Changes in the value of investments held in foreign currencies due to foreign currency rate movements are reflected as a direct increase or decrease to shareholders' equity and are not included in the consolidated statements of income. The Company has not matched a portion of its projected liabilities in foreign currencies with investments in the same currencies and may not match such amounts in future periods, which could increase the Company's exposure to foreign currency fluctuations and increase the volatility of the Company's shareholders' equity.

Loss on Repurchase of Preferred Shares. Following the issuance of $325.0 million of 6.75% Series C preferred shares in April 2012, we redeemed all of our $200.0 million of 8.0% Series A preferred shares and $125.0 million of 7.875% Series B preferred shares at a redemption price equal to $25.00 per share in May 2012. In accordance with GAAP, upon issuance of the Series A and B preferred shares in 2006, costs of $10.6 million were recognized as a reduction of additional paid-in capital in shareholders' equity. Following the repurchase of such shares, the $10.6 million of costs were recorded as a "loss on repurchase of preferred shares" to remove the costs from additional paid-in capital. Such adjustment had no impact on total shareholders' equity or cash flows.

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CRITICAL ACCOUNTING POLICIES, ESTIMATES AND RECENT ACCOUNTING PRONOUNCEMENTS

Critical accounting policies, estimates and recent accounting pronouncements are discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our 2012 Form 10-K, updated where applicable in the notes accompanying our consolidated financial statements.

FINANCIAL CONDITION, LIQUIDITY AND CAPITAL RESOURCES

Financial Condition

Investable Assets

The finance and investment committee of our board of directors establishes our investment policies and sets the parameters for creating guidelines for our investment managers. The finance and investment committee reviews the implementation of the investment strategy on a regular basis. Our current approach stresses preservation of capital, market liquidity and diversification of risk. While maintaining our emphasis on preservation of capital and liquidity, we expect our portfolio to become more diversified and, as a result, we may expand into areas which are not currently part of our investment strategy. Our Chief Investment Officer administers the investment portfolio, oversees our investment managers, formulates investment strategy in conjunction with our finance and investment committee and directly manages certain portions of our fixed income and equity portfolios.

The following table summarizes our invested assets:

	June 30, 2013					December 31, 2012
	Amount			% of Total		Amount			% of Total
Fixed maturities available for sale, at fair value	$	9,570,583		73.8		$	9,839,988		75.4
Fixed maturities, at fair value (1)	353,310			2.7		363,541			2.8
Fixed maturities pledged under securities lending agreements, at fair value (2)	44,666			0.3		42,600			0.3
Total fixed maturities	9,968,559			76.9		10,246,129			78.5
Short-term investments available for sale, at fair value	1,091,032			8.4		722,121			5.5
Short-term investments pledged under securities lending agreements, at fair value (2)	3,097			—		8,248			0.1
Cash	375,119			2.9		371,041			2.8
Equity securities available for sale, at fair value	438,038			3.4		312,749			2.4
Equity securities, at fair value (1)	—			—		25,954			0.2
Other investments available for sale, at fair value	569,407			4.4		549,280			4.2
Other investments, at fair value (1)	712,374			5.5		527,971			4.0
Investments accounted for using the equity method (3)	208,796			1.6		307,105			2.4
Total cash and investments	13,366,422			103.1		13,070,598			100.2
Securities sold but not yet purchased (4)	—			—		(6,924		)	(0.1	)
Securities transactions entered into but not settled at the balance sheet date	(405,611		)	(3.1	)	(18,540		)	(0.1	)
Total investable assets	$	12,960,811		100.0		$	13,045,134		100.0

_________________________________________________

(1) Represents securities which are carried at fair value under the fair value option and reflected as “investments accounted for using the fair value option” on our balance sheet. Changes in the carrying value of such securities are recorded in net realized gains or losses.

(2) This table excludes the collateral received and reinvested and includes the fixed maturities and short-term investments pledged under securities lending agreements, at fair value.

(3) Changes in the carrying value of investment funds accounted for using the equity method are recorded as “equity in net income (loss) of investments funds accounted for using the equity method” rather than as an unrealized gain or loss component of accumulated other comprehensive income.

(4) Represents our obligation to deliver equity securities that we did not own at the time of sale. Such amounts are included in “other liabilities” on our balance sheet.

At June 30, 2013, our fixed income portfolio, which includes fixed maturity securities and short-term investments, had average credit quality ratings from Standard & Poor’s Rating Services (“S&P”)/Moody’s of “AA-/Aa2” and an average yield to maturity (imbedded book yield), before investment expenses, of 2.43%. At December 31, 2012, our fixed income portfolio had average credit quality ratings from S&P/Moody’s of “AA-/Aa2” and an average yield to maturity of 2.60%. Our investment portfolio had an average effective duration of 3.04 years at June 30, 2013, compared to 3.06 years at December 31, 2012. At June 30, 2013, approximately $8.43 billion, or 65.1%, of our total investments and cash was internally managed, compared to $8.35 billion, or 64.0%, at December 31, 2012.

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The following table summarizes our fixed maturities and fixed maturities pledged under securities lending agreements ("Fixed Maturities") by type:

	Fair Value		Gross Unrealized Gains		Gross Unrealized Losses			Cost or Amortized Cost
June 30, 2013
Corporate bonds	$	2,767,106	$	33,423	$	(60,264	)	$	2,793,947
Mortgage backed securities	1,592,207		16,874		(46,562		)	1,621,895
Municipal bonds	1,507,924		35,880		(14,222		)	1,486,266
Commercial mortgage backed securities	838,471		15,687		(13,340		)	836,124
U.S. government and government agencies	975,345		8,744		(7,251		)	973,852
Non-U.S. government securities	1,062,323		9,671		(27,927		)	1,080,579
Asset backed securities	1,225,183		17,677		(17,948		)	1,225,454
Total	$	9,968,559	$	137,956	$	(187,514	)	$	10,018,117
December 31, 2012
Corporate bonds	$	3,132,645	$	105,798	$	(6,710	)	$	3,033,557
Mortgage backed securities	1,532,736		24,809		(7,484		)	1,515,411
Municipal bonds	1,463,586		62,322		(1,421		)	1,402,685
Commercial mortgage backed securities	824,165		37,514		(4,468		)	791,119
U.S. government and government agencies	1,131,688		20,178		(1,095		)	1,112,605
Non-U.S. government securities	1,087,310		33,701		(8,860		)	1,062,469
Asset backed securities	1,073,999		25,528		(5,838		)	1,054,309
Total	$	10,246,129	$	309,850	$	(35,876	)	$	9,972,155

The following table provides the credit quality distribution of our Fixed Maturities:

	June 30, 2013			December 31, 2012
Rating (1)	Fair Value		% of Total	Fair Value		% of Total
U.S. government and government agencies (2)	$	2,409,950	24.2	$	2,523,212	24.6
AAA	3,112,835		31.2	3,413,431		33.3
AA	1,921,194		19.3	1,563,846		15.3
A	1,392,488		14.0	1,501,156		14.7
BBB	414,100		4.2	538,140		5.3
BB	144,527		1.4	174,527		1.7
B	186,477		1.9	220,772		2.2
Lower than B	243,694		2.4	175,866		1.7
Not rated	143,294		1.4	135,179		1.2
Total	$	9,968,559	100.0	$	10,246,129	100.0

_________________________________________________

(1) For individual fixed maturities, S&P ratings are used. In the absence of an S&P rating, ratings from Moody’s are used, followed by ratings from Fitch Ratings.

(2) Includes U.S. government-sponsored agency mortgage backed securities and agency commercial mortgage backed securities.

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At June 30, 2013, below-investment grade securities comprised approximately 7.2% of our Fixed Maturities, compared to 6.9% at December 31, 2012. In accordance with our investment strategy, we invest in high yield fixed income securities which are included in “Corporate bonds.” Upon issuance, these securities are typically rated below investment grade (i.e., rating assigned by the major rating agencies of “BB” or less). At June 30, 2013, corporate bonds represented 59% of the total below investment grade securities at fair value, mortgage backed securities represented 32% of the total and 9% were in other classes. At December 31, 2012, corporate bonds represented 32% of the total below investment grade securities at fair value, mortgage backed securities represented 49% of the total and 19% were in other classes. Unrealized losses include the impact of foreign exchange movements on certain securities denominated in foreign currencies and, as such, the amount of securities in an unrealized loss position fluctuates due to foreign currency movements.

The following table provides information on the severity of the unrealized loss position as a percentage of amortized cost for all Fixed Maturities which were in an unrealized loss position:

	June 30, 2013						December 31, 2012
Severity of Unrealized Loss	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses
0-10%	$	5,912,225	$	(164,926	)	88.0	$	2,113,835	$	(28,439	)	79.3
10-20%	134,153		(20,917		)	11.1	43,871		(6,363		)	17.7
20-30%	6,639		(1,671		)	0.9	3,086		(1,074		)	3.0
Total	$	6,053,017	$	(187,514	)	100.0	$	2,160,792	$	(35,876	)	100.0

The following table provides information on the severity of the unrealized loss position as a percentage of amortized cost for non-investment grade Fixed Maturities which were in an unrealized loss position:

	June 30, 2013						December 31, 2012
Severity of Unrealized Loss	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses
0-10%	$	226,576	$	(8,422	)	4.5	$	87,223	$	(2,513	)	7.0
10-20%	6,293		(947		)	0.5	9,107		(1,529		)	4.3
20-30%	1,134		(295		)	0.2	—		—			—
Total	$	234,003	$	(9,664	)	5.2	$	96,330	$	(4,042	)	11.3

We determine estimated recovery values for our Fixed Maturities following a review of the business prospects, credit ratings, estimated loss given default factors and information received from asset managers and rating agencies for each security. For structured securities, we utilize underlying data, where available, for each security provided by asset managers and additional information from credit agencies in order to determine an expected recovery value for each security. The analysis provided by the asset managers includes expected cash flow projections under base case and stress case scenarios which modify expected default expectations and loss severities and slow down prepayment assumptions.

The following table summarizes our top ten exposures to fixed income corporate issuers by fair value at June 30, 2013, excluding guaranteed amounts and covered bonds:

	Fair Value		Credit Rating (1)
Apple Inc.	$	66,797	AA+/Aa1
General Electric Co.	62,071		AA+/A1
Crown Castle Int'l Corp.	36,905		NR/A2
Caterpillar Inc.	35,719		A/A2
Chevron Corp.	34,827		AA/Aa1
Merck & Co Inc.	33,166		AA/A2
HSBC Holdings PLC	32,246		AA-/Aa3
United Parcel Service Inc.	31,041		A+/Aa3
International Business Machines Corp	30,417		AA-/Aa3
Anheuser-Busch Inbev NV	29,997		A/A3
Total	$	393,186

_________________________________________________

(1)  Ratings as assigned by S&P/Moody’s.

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At June 30, 2013, we held insurance enhanced municipal bonds, net of prerefunded bonds that are escrowed in U.S. government obligations, the fair value of which was $192.5 million, or 1.5% of our total investable assets. These securities had average credit quality ratings from S&P/Moody’s of “AA/Aa2” with and without the insurance enhancement. This is due to the fact that, in cases where the claims paying ratings of the guarantors are below investment grade, those ratings have been withdrawn from the bonds by the relevant rating agencies, and the insured ratings have been equated to the underlying ratings. The ratings were obtained from the individual rating agencies and were assigned a numerical amount with 1 being the highest rating. The average ratings were calculated using the weighted average fair values of the individual bonds. The average ratings with and without the insurance enhancement are substantially the same at June 30, 2013. Guarantors of our insurance enhanced municipal bonds, net of prerefunded bonds that are escrowed in U.S. government obligations, included Assured Guaranty Ltd. ($58.8 million), National Public Finance Guarantee ($103.1 million) and the Texas Permanent School Fund ($30.6 million). We do not have a significant exposure to insurance enhanced asset-backed or mortgage-backed securities. We do not have any significant investments in companies which guarantee securities at June 30, 2013.

Our portfolio includes investments, such as mortgage-backed securities, which are subject to prepayment risk. At June 30, 2013, our investments in residential mortgage-backed securities (“MBS”) amounted to approximately $1.59 billion, or 12.3% of total investable assets, compared to $1.53 billion, or 11.7%, at December 31, 2012.  As with other fixed income investments, the fair value of these securities fluctuates depending on market and other general economic conditions and the interest rate environment. Changes in interest rates can expose us to changes in the prepayment rate on these investments. In periods of declining interest rates, mortgage prepayments generally increase and MBS are prepaid more quickly, requiring us to reinvest the proceeds at the then current market rates. Conversely, in periods of rising rates, mortgage prepayments generally fall, preventing us from taking full advantage of the higher level of rates. However, current economic conditions may curtail prepayment activity as refinancing becomes more difficult, thus limiting prepayments on MBS. Our portfolio also includes commercial mortgage backed securities (“CMBS”). At June 30, 2013, CMBS constituted approximately $838.5 million, or 6.5% of total investable assets, compared to $824.2 million, or 6.3%, at December 31, 2012. The commercial real estate market has experienced price deterioration, which could lead to increased delinquencies and defaults on commercial real estate mortgages.

Delinquencies and losses with respect to residential mortgage loans from certain vintage years have increased since 2007 and may continue to increase, particularly in the sub-prime sector. In addition, during this period, residential property values in many states have declined or remained stable, after extended periods during which those values appreciated. A continued decline or an extended flattening in those values may result in additional increases in delinquencies and losses on residential mortgage loans generally, especially with respect to second homes and investment properties, and with respect to any residential mortgage loans where the aggregate loan amounts (including any subordinate loans) are close to or greater than the related property values. These developments may have a significant adverse effect on the prices of loans and securities, including those in our investment portfolio. The situation continues to have wide ranging consequences, including downward pressure on economic growth and the potential for increased insurance and reinsurance exposures, which could have an adverse impact on our results of operations, financial condition, business and operations.

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The following table provides information on our MBS and CMBS at June 30, 2013, excluding amounts guaranteed by the U.S. government:

					Fair Value
	Issuance Year	Amortized Cost		Average Credit Quality	Total		% of Amortized Cost		% of Investable Assets
Non-agency MBS:	2003	$	1,882	AA-	$	1,978	105.1	%	—	%
	2004	6,311		BB	6,041		95.7	%	—	%
	2005	46,699		CCC+	49,021		105.0	%	0.4	%
	2006	75,712		CCC	78,361		103.5	%	0.6	%
	2007	70,431		C	73,985		105.0	%	0.6	%
	2008	5,674		CC+	5,883		103.7	%	—	%
	2009	1,798		AA-	1,841		102.4	%	—	%
	2010	22,423		AA	22,679		101.1	%	0.2	%
	2012	50,600		AA+	50,664		100.1	%	0.4	%
	2013	116,053		AAA	110,521		95.2	%	0.9	%
Total non-agency MBS		$	397,583	BB+	$	400,974	100.9	%	3.1	%
Non-agency CMBS:	2004	792		AAA	738		93.2	%	—	%
	2005	30,090		AAA	29,883		99.3	%	0.2	%
	2006	18,907		AA+	18,840		99.6	%	0.1	%
	2007	28,233		A-	29,756		105.4	%	0.2	%
	2008	295		AA+	310		105.1	%	—	%
	2009	224		AAA	223		99.6	%	—	%
	2010	114,220		AAA	120,122		105.2	%	0.9	%
	2011	133,952		AAA	140,248		104.7	%	1.1	%
	2012	145,731		AA+	143,664		98.6	%	1.1	%
	2013	115,090		AAA	111,315		96.7	%	0.9	%
Total non-agency CMBS		$	587,534	AA+	$	595,099	101.3	%	4.6	%

	Non-Agency MBS				Non-Agency
Additional Statistics:	Re-REMICs		All Other		CMBS (1)
Weighted average loan age (months)	88		62		31
Weighted average life (months) (2)	23		53		51
Weighted average loan-to-value % (3)	69.3	%	68.1	%	60.9	%
Total delinquencies (4)	20.8	%	16.0	%	1.3	%
Current credit support % (5)	53.0	%	7.1	%	29.5	%

_________________________________________________

(1) Loans defeased with government/agency obligations were not material to the collateral underlying our CMBS holdings.

(2) The weighted average life for MBS is based on the interest rates in effect at June 30, 2013. The weighted average life for CMBS reflects the average life of the collateral underlying our CMBS holdings.

(3) The range of loan-to-values is 26% to 91% on MBS and 7% to 112% on CMBS.

(4) Total delinquencies includes 60 days and over.

(5) Current credit support % represents the % for a collateralized mortgage obligation (“CMO”) or CMBS class/tranche from other subordinate classes in the same CMO or CMBS deal.

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The following table provides information on our asset backed securities (“ABS”) at June 30, 2013:

						Fair Value
	Amortized Cost		Average Credit Quality	Weighted Average Credit Support		Total		% of Amortized Cost		% of Investable Assets
Sector:
Equipment	$	343,398	A+	4	%	$	336,245	97.9	%	2.6	%
Credit cards	269,105		AAA	16	%	267,954		99.6	%	2.1	%
Loans	213,521		AA+	47	%	213,447		100.0	%	1.6	%
Autos	146,915		AAA	29	%	145,780		99.2	%	1.1	%
Rate reduction bonds	72,794		AAA	5	%	74,604		102.5	%	0.6	%
U.K. securitized	38,589		AAA	20	%	39,083		101.3	%	0.3	%
Commodities	23,000		AA+	7	%	23,450		102.0	%	0.2	%
Home equity	20,298		CCC+	19	%	26,832		132.2	%	0.2	%
Other	97,834		AA+			97,788		100.0	%	0.8	%
Total ABS (1)	$	1,225,454	AA			$	1,225,183	100.0	%	9.5	%

_________________________________________________

(1) The effective duration of the total ABS was 2.1 years at June 30, 2013.

At June 30, 2013, our fixed income portfolio included $51.1 million par value in sub-prime securities with a fair value of $27.9 million and average credit quality ratings from S&P/Moody’s of “B/Caa1.” At December 31, 2012, our fixed income portfolio included $66.9 million par value in sub-prime securities with a fair value of $42.1 million and average credit quality ratings from S&P/Moody’s of “A-/B2.” Such amounts were primarily in the home equity sector of our asset backed securities, with the balance in other ABS, MBS and CMBS sectors. We define sub-prime mortgage-backed securities as investments in which the underlying loans primarily exhibit one or more of the following characteristics: low FICO scores, above-prime interest rates, high loan-to-value ratios or high debt-to-income ratios. In addition, the portfolio of collateral backing our securities lending program contained $6.3 million fair value of sub-prime securities with average credit quality ratings from S&P/Moody’s of “CCC-/Ca” at June 30, 2013, compared to $5.4 million and “CCC-/Caa3” at December 31, 2012.

The following table provides information on the fair value of our Eurozone investments at June 30, 2013:

	Sovereign (2)		Financial Corporates		Other Corporates		Covered Bonds (3)		Bank Loans (4)		Equities and Other		Total
Country (1)
Finland	$	132,593	$	—	$	—	$	—	$	—	$	789	$	133,382
Netherlands	10,489		263		36,686		—		5,803		7,741		60,982
Germany	24,477		—		4,196		10,039		8,935		7,263		54,910
France	—		5,524		3,495		—		5,719		12,677		27,415
Supranational (5)	26,475		—		—		—		—		—		26,475
Luxembourg	—		—		15,249		—		5,044		399		20,692
Ireland	1,621		627		8,242		—		—		1,484		11,974
Austria	—		3,467		470		—		—		—		3,937
Spain	—		—		—		534		3,244		—		3,778
Italy	827		—		—		—		594		—		1,421
Belgium	—		—		—		—		—		770		770
Cyprus	$	—	$	—	$	360	$	—	$	—	$	—	$	360
Total	$	196,482	$	9,881	$	68,698	$	10,573	$	29,339	$	31,123	$	346,096

_________________________________________________

(1) The country allocations set forth in the table are based on various assumptions made by us in assessing the country in which the underlying credit risk resides, including a review of the jurisdiction of organization, business operations and other factors. Based on such analysis, we do not believe that we have any Eurozone investments from Estonia, Greece, Malta, Portugal, Slovakia or Slovenia at June 30, 2013.

(2) Sovereign includes securities issued and/or guaranteed by Eurozone governments.

(3) Securities issued by Eurozone banks where the security is backed by a separate group of loans.

(4) Included in "investments accounted for using the fair value option".

(5) Includes World Bank, European Investment Bank, International Finance Corp. and European Bank for Reconstruction and Development.

At June 30, 2013, our equity portfolio included $438.0 million of equity securities, compared to $331.8 million at December 31, 2012, net of securities sold but not purchased. Our equity portfolio primarily consists of publicly traded common stocks in the consumer staples, real estate and natural resources sectors. The following table provides information on the

48

severity of the unrealized loss position as a percentage of cost for all equity securities classified as available for sale which were in an unrealized loss position:

	June 30, 2013						December 31, 2012
Severity of Unrealized Loss	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses	Fair Value		Gross Unrealized Losses			% of Total Gross Unrealized Losses
0-10%	$	129,819	$	(5,485	)	32.6	$	114,670	$	(4,704	)	38.3
10-20%	26,764		(3,801		)	22.6	22,851		(3,612		)	29.4
20-30%	26,629		(7,035		)	41.8	6,205		(1,973		)	16.1
30-40%	996		(475		)	2.8	1,953		(981		)	8.0
40-50%	22		(18		)	0.1	1,027		(829		)	6.7
50-80%	14		(20		)	0.1	148		(191		)	1.5
Total	$	184,244	$	(16,834	)	100.0	$	146,854	$	(12,290	)	100.0

On a quarterly basis, we evaluate the unrealized losses of our equity securities by issuer and forecast a reasonable period of time by which the fair value of the securities would increase and we would recover the cost basis. Roughly 40% of the unrealized losses of equities were related to foreign currency fluctuations on our non-U.S. Dollar equity securities and substantially all of the unrealized losses on equity securities were on holdings which have been in a continual unrealized loss position for less than 12 months at June 30, 2013. We believe that a reasonable period of time exists to allow for recovery of the cost basis of our equity securities that are in an unrealized loss position at June 30, 2013.

The following table summarizes our other investments:

	June 30, 2013		December 31, 2012
Available for sale:
Asian and emerging markets	$	343,535	$	316,860
Investment grade fixed income	219,068		220,410
Other	6,804		12,010
Total available for sale	569,407		549,280
Fair value option:
Term loan investments (par value: $475,397 and $307,016)	481,773		308,596
Asian and emerging markets	28,932		24,035
Investment grade fixed income	74,320		67,624
Non-investment grade fixed income	9,331		11,093
Other (1)	118,018		116,623
Total fair value option	$	712,374	$	527,971
Total	$	1,281,781	$	1,077,251

________________________________________________

(1) Includes fund investments with strategies in mortgage servicing rights, transportation and infrastructure assets and other.

Certain of the our other investments are in investment funds for which we have the option to redeem at agreed upon values as described in each investment fund's subscription agreement. Depending on the terms of the various subscription agreements, investments in investment funds may be redeemed daily, monthly, quarterly or on other terms. Two common redemption restrictions which may impact our ability to redeem these investment funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the investment fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. If the investment funds are eligible to be redeemed, the time to redeem such fund can take weeks or months following the notification.

Investment funds accounted for using the equity method totaled $208.8 million at June 30, 2013, compared to $307.1 million at December 31, 2012. Certain of our investment managers may use leverage to achieve a higher rate of return on their assets under management, primarily those included in “other investments available for sale, at fair value,” “investments accounted for using the fair value option” and “investments accounted for using the equity method” on our balance sheet. While leverage presents opportunities for increasing the total return of such investments, it may increase losses as well. Accordingly,

49

any event that adversely affects the value of the underlying holdings would be magnified to the extent leverage is used and our potential losses would be magnified. In addition, the structures used to generate leverage may lead to such investments being required to meet covenants based on market valuations and asset coverage. Market valuation declines could force the sale of investments into a depressed market, which may result in significant additional losses. Alternatively, the levered investments may attempt to deleverage by raising additional equity or potentially changing the terms of the established financing arrangements. We may choose to participate in the additional funding of such investments.

Our investment strategy allows for the use of derivative instruments. We utilize various derivative instruments such as futures contracts to enhance investment performance, replicate investment positions or manage market exposures and duration risk that would be allowed under our investment guidelines if implemented in other ways. See note 9, “Derivative Instruments,” of the notes accompanying our consolidated financial statements for additional disclosures concerning derivatives.

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. See note 8, “Fair Value” of the notes accompanying our consolidated financial statements for a summary of our financial assets and liabilities measured at fair value at June 30, 2013 and December 31, 2012 by level.

Premiums Receivable and Reinsurance Recoverables

At June 30, 2013, 78.6% of premiums receivable of $877.0 million represented amounts not yet due, while amounts in excess of 90 days overdue were 3.3% of the total. At December 31, 2012, 69.6% of premiums receivable of $688.9 million represented amounts not yet due, while amounts in excess of 90 days overdue were 5.7% of the total. Approximately 0.9% of the $43.3 million of paid losses and loss adjustment expenses recoverable at June 30, 2013 were more than 90 days overdue, while 18.9% of the $41.0 million of paid losses and loss adjustment expenses recoverable at December 31, 2012 were more than 90 days overdue. Our reserves for doubtful accounts were approximately $11.5 million at June 30, 2013, compared to $12.0 million at December 31, 2012.

At June 30, 2013, approximately 87.6% of reinsurance recoverables on paid and unpaid losses (not including prepaid reinsurance premiums) of $1.85 billion were due from carriers which had an A.M. Best rating of “A-” or better and the largest reinsurance recoverables from any one carrier was approximately 4.8% of our total shareholders’ equity. At December 31, 2012, approximately 87.5% of reinsurance recoverables on paid and unpaid losses (not including prepaid reinsurance premiums) of $1.87 billion were due from carriers which had an A.M. Best rating of “A-” or better and the largest reinsurance recoverables from any one carrier was approximately 4.7% of our total shareholders’ equity.

The effects of reinsurance on written and earned premiums and losses and loss adjustment expenses with unaffiliated reinsurers were as follows:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Premiums Written
Direct	$	716,725		$	695,743		$	1,431,776		$	1,405,475
Assumed	324,014			356,070			772,661			712,994
Ceded	(230,204		)	(231,580		)	(441,126		)	(434,625		)
Net	$	810,535		$	820,233		$	1,763,311		$	1,683,844
Premiums Earned
Direct	$	656,700		$	633,341		$	1,304,222		$	1,247,352
Assumed	299,415			290,680			606,339			550,536
Ceded	(197,299		)	(197,365		)	(398,975		)	(390,920		)
Net	$	758,816		$	726,656		$	1,511,586		$	1,406,968
Losses and Loss Adjustment Expenses
Direct	$	415,766		$	386,050		$	767,533		$	739,832
Assumed	114,534			103,367			223,531			212,784
Ceded	(111,647		)	(89,724		)	(173,008		)	(157,716		)
Net	$	418,653		$	399,693		$	818,056		$	794,900

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Reserves for Losses and Loss Adjustment Expenses

We establish reserves for losses and loss adjustment expenses (“Loss Reserves”) which represent estimates involving actuarial and statistical projections, at a given point in time, of our expectations of the ultimate settlement and administration costs of losses incurred. Estimating Loss Reserves is inherently difficult, which is exacerbated by the fact that we are a relatively new company with relatively limited historical experience upon which to base such estimates. We utilize actuarial models as well as available historical insurance industry loss ratio experience and loss development patterns to assist in the establishment of Loss Reserves. Actual losses and loss adjustment expenses paid will deviate, perhaps substantially, from the reserve estimates reflected in our financial statements.

At June 30, 2013 and December 31, 2012, our Loss Reserves, net of unpaid losses and loss adjustment expenses recoverable, by type and by operating segment were as follows:

	June 30, 2013		December 31, 2012
Insurance:
Case reserves	$	1,420,742	$	1,438,575
IBNR reserves	2,986,066		2,979,344
Total net reserves	$	4,406,808	$	4,417,919
Reinsurance:
Case reserves	$	738,363	$	781,894
Additional case reserves	143,839		195,033
IBNR reserves	1,712,974		1,709,376
Total net reserves	$	2,595,176	$	2,686,303
Total:
Case reserves	$	2,159,105	$	2,220,469
Additional case reserves	143,839		195,033
IBNR reserves	4,699,040		4,688,720
Total net reserves	$	7,001,984	$	7,104,222

At June 30, 2013 and December 31, 2012, the insurance segment’s Loss Reserves by major line of business, net of unpaid losses and loss adjustment expenses recoverable, were as follows:

	June 30, 2013		December 31, 2012
Executive assurance	$	791,083	$	772,768
Casualty	686,637		663,703
Programs	597,231		592,235
Professional liability	584,551		598,638
Property, energy, marine and aviation	538,871		613,176
Construction	437,772		430,170
National accounts	219,322		207,551
Healthcare	131,845		135,227
Surety	91,475		95,139
Travel and accident	32,295		36,568
Lenders products	30,428		28,606
Other (1)	265,298		244,138
Total net reserves	$	4,406,808	$	4,417,919

_________________________________________________

(1) Includes alternative markets, contract binding, accident and health and excess workers' compensation business.

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At June 30, 2013 and December 31, 2012, the reinsurance segment’s Loss Reserves by major line of business, net of unpaid losses and loss adjustment expenses recoverable, were as follows:

	June 30, 2013		December 31, 2012
Casualty	$	1,549,964	$	1,570,165
Other specialty	328,564		288,797
Property excluding property catastrophe	259,743		323,727
Property catastrophe	233,741		277,817
Marine and aviation	163,689		169,190
Other	59,475		56,607
Total net reserves	$	2,595,176	$	2,686,303

Shareholders’ Equity

Our shareholders’ equity was $5.23 billion at June 30, 2013, compared to $5.17 billion at December 31, 2012. The increase in 2013 was primarily attributable to underwriting returns, partially offset by the impact of unrealized losses on our investment portfolio in the 2013 second quarter.

Book Value per Common Share

The following table presents the calculation of book value per common share:

(U.S. dollars in thousands, except share data)	June 30, 2013		December 31, 2012
Calculation of book value per common share:
Total shareholders’ equity	$	5,234,318	$	5,168,878
Less preferred shareholders’ equity	325,000		325,000
Common shareholders’ equity	$	4,909,318	$	4,843,878
Common shares outstanding (1)	133,416,419		133,842,613
Book value per common share	$	36.80	$	36.19

_________________________________________________

(1) Excludes the effects of 8,612,453 and 8,221,444 stock options and 481,474 and 480,406 restricted stock units outstanding at June 30, 2013 and December 31, 2012, respectively.

Liquidity and Capital Resources

ACGL is a holding company whose assets primarily consist of the shares in its subsidiaries. Generally, ACGL depends on its available cash resources, liquid investments and dividends or other distributions from its subsidiaries to make payments, including the payment of debt service obligations and operating expenses it may incur and any dividends or liquidation amounts with respect to the non-cumulative preferred shares and common shares. ACGL’s readily available cash, short-term investments and marketable securities, excluding amounts held by our regulated insurance and reinsurance subsidiaries, totaled $15.7 million at June 30, 2013, compared to $14.7 million at December 31, 2012. For the six months ended June 30, 2013, ACGL received dividends of $93.0 million from Arch Reinsurance Ltd. (“Arch Re Bermuda”), our Bermuda-based reinsurer and insurer.

The ability of our regulated insurance and reinsurance subsidiaries to pay dividends or make distributions or other payments to us is dependent on their ability to meet applicable regulatory standards. Under Bermuda law, Arch Re Bermuda is required to maintain an enhanced capital requirement which must equal or exceed its minimum solvency margin (i.e., the amount by which the value of its general business assets must exceed its general business liabilities) equal to the greatest of (1) $100.0 million, (2) 50% of net premiums written (being gross premiums written less any premiums ceded by Arch Re Bermuda, but Arch Re Bermuda may not deduct more than 25% of gross premiums when computing net premiums written) and (3) 15% of net discounted aggregated losses and loss expense provisions and other insurance reserves. Arch Re Bermuda is prohibited from declaring or paying any dividends during any financial year if it is not in compliance with its enhanced capital requirement, minimum solvency margin or minimum liquidity ratio. In addition, Arch Re Bermuda is prohibited from declaring or paying in any financial year dividends of more than 25% of its total statutory capital and surplus (as shown on its previous financial year's statutory balance sheet) unless it files, at least seven days before payment of such dividends, with the Bermuda Monetary Authority (“BMA”) an affidavit stating that it will continue to meet the required margins. In addition, Arch Re Bermuda is prohibited, without prior approval of the BMA, from reducing by 15% or more its total statutory capital, as set out

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in its previous year's statutory financial statements. As a Class 4 insurer, Arch Re Bermuda is required to maintain available statutory capital and surplus pertaining to its general business at a level equal to or in excess of its enhanced capital requirement ("ECR") which is established by reference to either the BSCR model (“BSCR”) or an approved internal capital model. At December 31, 2012, as determined under Bermuda law, Arch Re Bermuda had statutory capital of $2.32 billion and statutory capital and surplus of $5.01 billion, which amounts were in compliance with Arch Re Bermuda's ECR at such date. Such amounts include ownership interests in U.S. insurance and reinsurance subsidiaries. Accordingly, Arch Re Bermuda can pay approximately $1.16 billion to ACGL during the remainder of 2013 without providing an affidavit to the BMA, as discussed above. In addition, under BMA guidelines that became effective on January 1, 2013, the value of the assets of our insurance group (i.e., the group of companies that conducts exclusively, or mainly, insurance business) must exceed the amount of the group's liabilities by the aggregate minimum margin of solvency of each qualifying member of the group (the “Group MSM”). A member is a qualifying member of the insurance group if it is subject to solvency requirements in the jurisdiction in which it is registered. We were in compliance with the Group MSM at December 31, 2012.

In addition to meeting applicable regulatory standards, the ability of our insurance and reinsurance subsidiaries to pay dividends to intermediate parent companies owned by Arch Re Bermuda is also constrained by our dependence on the financial strength ratings of our insurance and reinsurance subsidiaries from independent rating agencies. The ratings from these agencies depend to a large extent on the capitalization levels of our insurance and reinsurance subsidiaries. We believe that ACGL has sufficient cash resources and available dividend capacity to service its indebtedness and other current outstanding obligations.

Our insurance and reinsurance subsidiaries are required to maintain assets on deposit, which primarily consist of fixed maturities, with various regulatory authorities to support their operations. The assets on deposit are available to settle insurance and reinsurance liabilities to third parties. Our insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. At June 30, 2013 and December 31, 2012, such amounts approximated $5.43 billion and $5.47 billion, respectively.

Our non-U.S. operations account for a significant percentage of our net premiums written. In general, the business written by our non-U.S. operations, which is heavily weighted towards reinsurance business, has been more profitable than the business written in our U.S. operations, which is weighted more towards insurance business. In general, our reinsurance segment has operated at a higher margin than our insurance segment, which is due to prevailing market conditions and the mix and type of business written. The most profitable line of business in the current environment continues to be catastrophe-exposed property reinsurance, which is written primarily in our non-U.S. operations. Additionally, a significant component of our pre-tax income is generated through our investment performance. We hold a substantial amount of our investable assets in our non-U.S. operations and, accordingly, a large portion of our investment income is produced in our non-U.S. operations. In addition, ACGL, through its subsidiaries, provides financial support to certain of its insurance subsidiaries and affiliates, through certain reinsurance arrangements beneficial to the ratings of such subsidiaries. Our U.S.-based insurance and reinsurance groups enter into separate reinsurance arrangements with Arch Re Bermuda covering individual lines of business. For the 2012 calendar year, the U.S. groups ceded business to Arch Re Bermuda at an aggregate net cession rate (i.e., net of third party reinsurance) of approximately 46% (compared to 51% for 2011). All of the above factors have resulted in the non-U.S. group providing a higher contribution to our overall pre-tax income in the current period than the percentage of net premiums written would indicate.

Except as described in the above paragraph, or where express reinsurance, guarantee or other financial support contractual arrangements are in place, each of ACGL’s subsidiaries or affiliates is solely responsible for its own liabilities and commitments (and no other ACGL subsidiary or affiliate is so responsible). Any reinsurance arrangements, guarantees or other financial support contractual arrangements that are in place are solely for the benefit of the ACGL subsidiary or affiliate involved and third parties (creditors or insureds of such entity) are not express beneficiaries of such arrangements.

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The following table summarizes our consolidated cash flows from operating, investing and financing activities:

	Six Months Ended
	June 30,
	2013			2012
Total cash provided by (used for):
Operating activities	$	388,354		$	397,268
Investing activities	(305,712		)	(315,321		)
Financing activities	(66,128		)	(78,747		)
Effects of exchange rate changes on foreign currency cash	(12,436		)	493
Increase in cash	$	4,078		$	3,693

• Cash provided by operating activities for the six months ended June 30, 2013 was lower than in the 2012 period. The decrease in operating cash flows primarily resulted from higher paid losses for the six months ended June 30, 2013, including outflows on named catastrophic events and the maturation of our reserves, partially offset by an increase in premium receipts. Cash flows for the six months ended June 30, 2013 also included an income distribution from an investment fund accounted for using the equity method upon the sale of such investment.

• Cash used for investing activities for the six months ended June 30, 2013 was lower than in the 2012 period. Activity for the six months ended June 30, 2013 reflected a higher level of purchases and sales of fixed maturity investments and reflected a higher level of securities on loan through our securities lending program than in the 2012 period.

• Cash used for financing activities for the six months ended June 30, 2013 was lower than in the 2012 period. Activity for the six months ended June 30, 2013 reflected $56.5 million of share repurchases under our share repurchase program while the 2012 period did not include any repurchase activity. The 2012 period reflected the repayment of $73.8 million of TALF borrowings. In addition, as noted above, cash flows for the six months ended June 30, 2013 reflected a lower financing inflow for securities on loan through our securities lending program than in the 2012 period.

Our insurance and reinsurance operations provide liquidity in that premiums are received in advance, sometimes substantially in advance, of the time losses are paid. The period of time from the occurrence of a claim through the settlement of the liability may extend many years into the future. Sources of liquidity include cash flows from operations, financing arrangements or routine sales of investments.

As part of our investment strategy, we seek to establish a level of cash and highly liquid short-term and intermediate-term securities which, combined with expected cash flow, is believed by us to be adequate to meet our foreseeable payment obligations. However, due to the nature of our operations, cash flows are affected by claim payments that may comprise large payments on a limited number of claims and which can fluctuate from year to year. We believe that our liquid investments and cash flow will provide us with sufficient liquidity in order to meet our claim payment obligations. However, the timing and amounts of actual claim payments related to recorded Loss Reserves vary based on many factors, including large individual losses, changes in the legal environment, as well as general market conditions. The ultimate amount of the claim payments could differ materially from our estimated amounts. Certain lines of business written by us, such as excess casualty, have loss experience characterized as low frequency and high severity. The foregoing may result in significant variability in loss payment patterns. The impact of this variability can be exacerbated by the fact that the timing of the receipt of reinsurance recoverables owed to us may be slower than anticipated by us. Therefore, the irregular timing of claim payments can create significant variations in cash flows from operations between periods and may require us to utilize other sources of liquidity to make these payments, which may include the sale of investments or utilization of existing or new credit facilities or capital market transactions. If the source of liquidity is the sale of investments, we may be forced to sell such investments at a loss, which may be material.

Our investments in certain securities, including certain fixed income and structured securities, investments in funds accounted for using the equity method, other investments and our investment in Gulf Reinsurance Limited (joint venture) may be illiquid due to contractual provisions or investment market conditions. If we require significant amounts of cash on short notice in excess of anticipated cash requirements, then we may have difficulty selling these investments in a timely manner or may be forced to sell or terminate them at unfavorable values.

On a consolidated basis, our aggregate investable assets totaled $12.96 billion at June 30, 2013, compared to $13.05 billion at December 31, 2012. The primary goals of our asset liability management process are to satisfy the insurance

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liabilities, manage the interest rate risk embedded in those insurance liabilities and maintain sufficient liquidity to cover fluctuations in projected liability cash flows, including debt service obligations. Generally, the expected principal and interest payments produced by our fixed income portfolio adequately fund the estimated runoff of our insurance reserves. Although this is not an exact cash flow match in each period, the substantial degree by which the fair value of the fixed income portfolio exceeds the expected present value of the net insurance liabilities, as well as the positive cash flow from newly sold policies and the large amount of high quality liquid bonds, provide assurance of our ability to fund the payment of claims and to service our outstanding debt without having to sell securities at distressed prices or access credit facilities. Our unfunded investment commitments totaled approximately $751.0 million at June 30, 2013.

Various rating agencies have announced the possibility of future downgrades of the United States’ credit rating, depending on spending levels, interest rates, fiscal pressures that result in a higher general government debt trajectory and other factors. In addition, the impact of the continuing weakness of the U.S., European countries and other key economies, projected budget deficits for the U.S., European countries and other governments and the consequences associated with possible additional downgrades of securities of the U.S., European countries and other governments by credit rating agencies is inherently unpredictable and could have a material adverse effect on financial markets and economic conditions in the U.S. and throughout the world. In turn, this could have a material adverse effect on our business, financial condition and results of operations and, in particular, this could have a material adverse effect on the value and liquidity of securities in our investment portfolio. Our investment portfolio as of June 30, 2013 included $975.3 million of obligations of the U.S. government and government agencies at fair value and $1.51 billion of municipal bonds at fair value. Please refer to Item 1A “Risk Factors” of our 2012 Form 10-K for a discussion of other risks relating to our business and investment portfolio.

We expect that our liquidity needs, including our anticipated insurance obligations and operating and capital expenditure needs, for the next twelve months, at a minimum, will be met by funds generated from underwriting activities and investment income, as well as by our balance of cash, short-term investments, proceeds on the sale or maturity of our investments, and our credit facilities.

We monitor our capital adequacy on a regular basis and will seek to adjust our capital base (up or down) according to the needs of our business. The future capital requirements of our business will depend on many factors, including our ability to write new business successfully and to establish premium rates and reserves at levels sufficient to cover losses. Our ability to underwrite is largely dependent upon the quality of our claims paying and financial strength ratings as evaluated by independent rating agencies. In particular, we require (1) sufficient capital to maintain our financial strength ratings, as issued by several ratings agencies, at a level considered necessary by management to enable our key operating subsidiaries to compete; (2) sufficient capital to enable our underwriting subsidiaries to meet the capital adequacy tests performed by statutory agencies in the U.S. and other key markets; and (3) letters of credit and other forms of collateral that are necessary for our non-U.S. operating companies because they are “non-admitted” under U.S. state insurance regulations.

In February 2013, certain of our U.S.-based subsidiaries (collectively “Arch U.S. MI”) entered into a definitive agreement to acquire (1) CMG Mortgage Insurance Company (“CMG MI”) from its current owners, PMI Mortgage Insurance Co. in rehabilitation (“PMI”), which has been under the receivership of the Arizona Department of Insurance since 2011, and CMFG Life Insurance Company, and (2) PMI's mortgage insurance operating platform and certain related assets from PMI. In connection with the closing of the transactions, PMI and an affiliate of our U.S.-based subsidiaries will enter into a quota share reinsurance agreement pursuant to which such affiliate, as the reinsurer, will agree to provide 100% quota share indemnity reinsurance to PMI for all certificates of insurance that were issued by PMI between and including January 1, 2009 and December 31, 2011 that are not in default as of an agreed upon effective date. At closing, it is currently estimated that our U.S.-based subsidiaries will pay aggregate consideration of approximately $300 million under all transaction documents. Additional amounts may be paid based on the actual results of CMG MI's pre-closing portfolio over an agreed upon period. In addition, we will enter into a services agreement with PMI to provide for necessary services to administer the run-off of PMI's legacy business at the direction of PMI.

On June 20, 2013, the Arizona receivership court provided the required approval of the acquisition. The transaction is also subject to approvals of the applicable regulators and approvals by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation of Arch U.S. MI as an eligible insurance carrier in the U.S. mortgage insurance marketplace, as well as the satisfaction of customary closing conditions. In connection with obtaining such consents of regulatory authorities and government-sponsored entities, it is anticipated that Arch U.S. MI or its affiliates will be required to make certain financial commitments to CMG MI, the form and amount of which will be determined based upon discussions with such authorities and entities. Arch U.S. MI's obligation to the sellers to accept financial requirements imposed by regulatory authorities and government-sponsored entities will be determined on the basis of, among other things, the appropriateness of such requirements in light of Arch U.S. MI's business plan and the consistency of such requirements with those imposed on other active

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participants in the U.S. mortgage insurance industry, as described in the purchase agreements. If these approvals are obtained, it is expected the transaction will close during the latter part of 2013.

As part of our capital management program, we may seek to raise additional capital or may seek to return capital to our shareholders through share repurchases, cash dividends or other methods (or a combination of such methods). Any such determination will be at the discretion of our board of directors and will be dependent upon our profits, financial requirements and other factors, including legal restrictions, rating agency requirements and such other factors as our board of directors deems relevant.

The board of directors of ACGL has authorized the investment in ACGL’s common shares through a share repurchase program. Authorizations have consisted of a $1.0 billion authorization in February 2007, a $500.0 million authorization in May 2008, a $1.0 billion authorization in November 2009 and a $1.0 billion authorization in February 2011. Since the inception of the share repurchase program through June 30, 2013, ACGL has repurchased 109.9 million common shares for an aggregate purchase price of $2.79 billion. At June 30, 2013, $713.4 million of share repurchases were available under the program. Repurchases under the program may be effected from time to time in open market or privately negotiated transactions through December 2014. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations. We will continue to monitor our share price and, depending upon results of operations, market conditions and the development of the economy, as well as other factors, we will consider share repurchases on an opportunistic basis.

To the extent that our existing capital is insufficient to fund our future operating requirements or maintain such ratings, we may need to raise additional funds through financings or limit our growth. We can provide no assurance that, if needed, we would be able to obtain additional funds through financing on satisfactory terms or at all. Adverse developments in the financial markets, such as disruptions, uncertainty or volatility in the capital and credit markets, may result in realized and unrealized capital losses that could have a material adverse effect on our results of operations, financial position and our businesses, and may also limit our access to capital required to operate our business.

If we are not able to obtain adequate capital, our business, results of operations and financial condition could be adversely affected, which could include, among other things, the following possible outcomes: (1) potential downgrades in the financial strength ratings assigned by ratings agencies to our operating subsidiaries, which could place those operating subsidiaries at a competitive disadvantage compared to higher-rated competitors; (2) reductions in the amount of business that our operating subsidiaries are able to write in order to meet capital adequacy-based tests enforced by statutory agencies; and (3) any resultant ratings downgrades could, among other things, affect our ability to write business and increase the cost of bank credit and letters of credit. In addition, under certain of the reinsurance agreements assumed by our reinsurance operations, upon the occurrence of a ratings downgrade or other specified triggering event with respect to our reinsurance operations, such as a reduction in surplus by specified amounts during specified periods, our ceding company clients may be provided with certain rights, including, among other things, the right to terminate the subject reinsurance agreement and/or to require that our reinsurance operations post additional collateral.

In addition to common share capital, we depend on external sources of finance to support our underwriting activities, which can be in the form (or any combination) of debt securities, preference shares, common equity and bank credit facilities providing loans and/or letters of credit. As noted above, equity or debt financing, if available at all, may be on terms that are unfavorable to us. In the case of equity financings, dilution to our shareholders could result, and, in any case, such securities may have rights, preferences and privileges that are senior to those of our outstanding securities.

In August 2011, we entered into a three-year agreement for a $300 million unsecured revolving loan and letter of credit facility and a $500 million secured letter of credit facility. Under the terms of the agreement, Arch Reinsurance Company, our U.S.-based reinsurer, and Arch Re Bermuda are limited to issuing $100 million of unsecured letters of credit as part of the unsecured revolving loan. In addition, we have access to secured letter of credit facilities of approximately $113.9 million, which are available on a limited basis and for limited purposes. Refer to note 4, “Commitments and Contingencies—Letter of Credit and Revolving Credit Facilities,” of the notes accompanying our consolidated financial statements for a discussion of our available facilities, applicable covenants on such facilities and available capacity.

In March 2012, ACGL and Arch Capital Group (U.S.) Inc. filed a universal shelf registration statement with the SEC. This registration statement allows for the possible future offer and sale by us of various types of securities, including unsecured debt securities, preference shares, common shares, warrants, share purchase contracts and units and depositary shares. The shelf registration statement enables us to efficiently access the public debt and/or equity capital markets in order to meet our future capital needs. The shelf registration statement also allows selling shareholders to resell common shares that they own in one or more offerings from time to time. We will not receive any proceeds from any shares offered by the selling shareholders. This

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report is not an offer to sell or the solicitation of an offer to buy nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of any such state.

In April 2012, ACGL completed the underwritten public offering of $325 million of its 6.75% Series C non-cumulative preferred shares. Except in specified circumstances relating to certain tax or corporate events, the Series C non-cumulative preferred shares are not redeemable prior to April 2, 2017. Dividends on the Series C preferred shares are non-cumulative. Consequently, in the event dividends are not declared on the Series C preferred shares for any dividend period, holders of preferred shares will not be entitled to receive a dividend for such period, and such undeclared dividend will not accrue and will not be payable. Holders of Series C preferred shares will be entitled to receive dividend payments only when, as and if declared by ACGL’s board of directors or a duly authorized committee of ACGL’s board of directors. Any such dividends will be payable from the date of original issue on a non-cumulative basis, quarterly in arrears on the last day of each period. To the extent declared, these dividends will accumulate, with respect to each dividend period, in an amount per share equal to 6.75% of the $25.00 liquidation preference per annum.

At June 30, 2013, ACGL’s capital of $5.63 billion consisted of $300.0 million of senior notes, representing 5.3% of the total, $100.0 million of revolving credit agreement borrowings due in August 2014, representing 1.8% of the total, $325.0 million of preferred shares, representing 5.8% of the total, and common shareholders’ equity of $4.91 billion, representing the balance. At December 31, 2012, ACGL’s capital of $5.57 billion consisted of $300.0 million of senior notes, representing 5.4% of the total, $100.0 million of revolving credit agreement borrowings due in August 2014, representing 1.8% of the total, $325.0 million of preferred shares, representing 5.8% of the total, and common shareholders’ equity of $4.84 billion, representing the balance. The increase in capital during 2013 was primarily attributable to positive underwriting and investment returns.

Off-Balance Sheet Arrangements

Off-balance sheet arrangements are discussed in Management’s Discussion and Analysis of Financial Condition and Results of Operations contained in our 2012 Form 10-K.

Market Sensitive Instruments and Risk Management

In accordance with the SEC’s Financial Reporting Release No. 48, we performed a sensitivity analysis to determine the effects that market risk exposures could have on the future earnings, fair values or cash flows of our financial instruments as of June 30, 2013. Market risk represents the risk of changes in the fair value of a financial instrument and is comprised of several components, including liquidity, basis and price risks. An analysis of material changes in market risk exposures at June 30, 2013 that affect the quantitative and qualitative disclosures presented in our 2012 Form 10-K (see section captioned “Management’s Discussion and Analysis of Financial Condition and Results of Operations—Market Sensitive Instruments and Risk Management”) were as follows:

Investment Market Risk

Fixed Income Securities. We invest in interest rate sensitive securities, primarily debt securities. We consider the effect of interest rate movements on the fair value of our fixed maturities, fixed maturities pledged under securities lending agreements, short-term investments and certain of our other investments which invest in fixed income securities and the corresponding change in unrealized appreciation. As interest rates rise, the fair value of our interest rate sensitive securities falls, and the converse is also true. Based on historical observations, there is a low probability that all interest rate yield curves would shift in the same direction at the same time. Furthermore, in recent months interest rate movements in many credit sectors have exhibited a much lower correlation to changes in U.S. Treasury yields. Accordingly, the actual effect of interest rate movements may differ materially from the amounts set forth in the following tables.

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The following table summarizes the effect that an immediate, parallel shift in the interest rate yield curve would have had on our fixed income securities:

	Interest Rate Shift in Basis Points
(U.S. dollars in millions)	-100			-50			—		+50			+100
June 30, 2013
Total fair value	$	12,278.2		$	12,108.2		$	11,928.6	$	11,750.0		$	11,573.2
Change from base	2.93		%	1.51		%	—		(1.50		)%	(2.98		)%
Change in unrealized value	$	349.6		$	179.6		$	—	$	(178.6	)	$	(355.4	)
December 31, 2012
Total fair value	$	12,463.4		$	12,303.5		$	12,121.9	$	11,937.4		$	11,751.6
Change from base	2.82		%	1.50		%	—		(1.52		)%	(3.05		)%
Change in unrealized value	$	341.5		$	181.6		$	—	$	(184.5	)	$	(370.3	)

In addition, we consider the effect of credit spread movements on the fair value of our fixed maturities, fixed maturities pledged under securities lending agreements, short-term investments and certain of our other investments and investment funds accounted for using the equity method which invest in fixed income securities and the corresponding change in unrealized appreciation. As credit spreads widen, the fair value of our fixed income securities falls, and the converse is also true.

The following table summarizes the effect that an immediate, parallel shift in credit spreads in a static interest rate environment would have had on our fixed income securities:

	Credit Spread Shift in Basis Points
(U.S. dollars in millions)	-100			-50			—		+50			+100
June 30, 2013
Total fair value	$	12,145.6		$	12,052.2		$	11,928.6	$	11,816.3		$	11,703.1
Change from base	1.82		%	1.04		%	—		(0.94		)%	(1.89		)%
Change in unrealized value	$	217.0		$	123.6		$	—	$	(112.3	)	$	(225.5	)
December 31, 2012
Total fair value	$	12,337.5		$	12,242.7		$	12,121.9	$	12,008.8		$	11,894.8
Change from base	1.78		%	1.00		%	—		(0.93		)%	(1.87		)%
Change in unrealized value	$	215.6		$	120.8		$	—	$	(113.1	)	$	(227.1	)

Another method that attempts to measure portfolio risk is Value-at-Risk (“VaR”). VaR attempts to take into account a broad cross-section of risks facing a portfolio by utilizing relevant securities volatility data skewed towards the most recent months and quarters. VaR measures the amount of a portfolio at risk for outcomes 1.65 standard deviations from the mean based on normal market conditions over a one year time horizon and is expressed as a percentage of the portfolio’s initial value. In other words, 95% of the time, should the risks taken into account in the VaR model perform per their historical tendencies, the portfolio’s loss in any one year period is expected to be less than or equal to the calculated VaR, stated as a percentage of the measured portfolio’s initial value. As of June 30, 2013, our portfolio’s VaR was estimated to be 3.86%, compared to an estimated 2.75% at December 31, 2012.

Other Investments, Equity Securities and Privately Held Securities. Our investment portfolio includes an allocation to other investments, equity securities and privately held securities. At June 30, 2013 and December 31, 2012, the fair value of such investments totaled $657.5 million and $563.7 million, respectively. These investments are exposed to price risk, which is the potential loss arising from decreases in fair value. An immediate hypothetical 10% decline in the value of each position would reduce the fair value of such investments by approximately $65.8 million and $56.4 million at June 30, 2013 and December 31, 2012, respectively, and would have decreased book value per common share by approximately $0.49 and $0.42, respectively. An immediate hypothetical 10% increase in the value of each position would increase the fair value of such investments by approximately $65.8 million and $56.4 million at June 30, 2013 and December 31, 2012, respectively, and would have increased book value per common share by approximately $0.49 and $0.42, respectively.

Investment-Related Derivatives. Derivative instruments may be used to enhance investment performance, replicate investment positions or manage market exposures and duration risk that would be allowed under our investment guidelines if implemented in other ways. The fair values of those derivatives are based on quoted market prices. See note 9, “Derivative Instruments,” of the notes accompanying our consolidated financial statements for additional disclosures concerning

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derivatives. At June 30, 2013, the notional value of the net long position of derivative instruments (excluding to-be-announced mortgage backed securities which are included in the fixed income securities analysis above and foreign currency forward contracts which are included in the foreign currency exchange risk analysis below) was $506.8 million, compared to $390.7 million at December 31, 2012. A 100 basis point depreciation of the underlying exposure to these derivative instruments at June 30, 2013 and December 31, 2012 would have resulted in a reduction in net income of approximately $5.1 million and $3.9 million, respectively, and would have decreased book value per common share by $0.04 and $0.03, respectively. A 100 basis point appreciation of the underlying exposure to these derivative instruments at June 30, 2013 and December 31, 2012 would have resulted in an increase in net income of approximately $5.1 million and $3.9 million, respectively, and would have increased book value per common share by $0.04 and $0.03, respectively.

For further discussion on investment activity, please refer to “—Financial Condition, Liquidity and Capital Resources—Financial Condition—Investable Assets.”

Foreign Currency Exchange Risk

Foreign currency rate risk is the potential change in value, income and cash flow arising from adverse changes in foreign currency exchange rates. Through our subsidiaries and branches located in various foreign countries, we conduct our insurance and reinsurance operations in a variety of local currencies other than the U.S. Dollar. We generally hold investments in foreign currencies which are intended to mitigate our exposure to foreign currency fluctuations in our net insurance liabilities. We may also utilize foreign currency forward contracts and currency options as part of our investment strategy. See Note 9, “Derivative Instruments,” of the notes accompanying our consolidated financial statements for additional information.

The following table provides a summary of our net foreign currency exchange exposures, as well as foreign currency derivatives in place to manage these exposures:

(U.S. dollars in thousands, except per share data)	June 30, 2013			December 31, 2012
Assets, net of insurance liabilities, denominated in foreign currencies, excluding shareholders’ equity and derivatives	$	12,957		$	146,227
Shareholders’ equity denominated in foreign currencies (1)	355,758			290,310
Net foreign currency forward contracts outstanding (2)	(80,466		)	(76,517		)
Net exposures denominated in foreign currencies	$	288,249		$	360,020
Pre-tax impact of a hypothetical 10% appreciation of the U.S. Dollar against foreign currencies:
Shareholders’ equity	$	(28,825	)	$	(36,002	)
Book value per common share	$	(0.22	)	$	(0.27	)
Pre-tax impact of a hypothetical 10% decline of the U.S. Dollar against foreign currencies:
Shareholders’ equity	$	28,825		$	36,002
Book value per common share	$	0.22		$	0.27

_________________________________________________

(1) Represents capital contributions held in the foreign currencies of our operating units.

(2) Notional value of the outstanding foreign currency forward contracts in U.S. Dollars.

As a result of the current financial and economic environment as well as the potential for additional investment returns, we may not match a portion of our projected liabilities in foreign currencies with investments in the same currencies, which would increase our exposure to foreign currency fluctuations and increase the volatility in our results of operations. Historical observations indicate a low probability that all foreign currency exchange rates would shift against the U.S. Dollar in the same direction and at the same time and, accordingly, the actual effect of foreign currency rate movements may differ materially from the amounts set forth above. For further discussion on foreign exchange activity, please refer to “—Results of Operations.”

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Cautionary Note Regarding Forward-Looking Statements

The Private Securities Litigation Reform Act of 1995 (“PSLRA”) provides a “safe harbor” for forward-looking statements. This release or any other written or oral statements made by or on behalf of us may include forward-looking statements, which reflect our current views with respect to future events and financial performance. All statements other than statements of historical fact included in or incorporated by reference in this release are forward-looking statements. Forward-looking statements, for purposes of the PSLRA or otherwise, can generally be identified by the use of forward-looking terminology such as “may,” “will,” “expect,” “intend,” “estimate,” “anticipate,” “believe” or “continue” and similar statements of a future or forward-looking nature or their negative or variations or similar terminology.

Forward-looking statements involve our current assessment of risks and uncertainties. Actual events and results may differ materially from those expressed or implied in these statements. Important factors that could cause actual events or results to differ materially from those indicated in such statements are discussed below and elsewhere in this release and in our periodic reports filed with the Securities and Exchange Commission (the “SEC”), and include:

• our ability to successfully implement its business strategy during “soft” as well as “hard” markets;

• acceptance of our business strategy, security and financial condition by rating agencies and regulators, as well as by brokers and our insureds and reinsureds;

• our ability to maintain or improve our ratings, which may be affected by our ability to raise additional equity or debt financings, by ratings agencies’ existing or new policies and practices, as well as other factors described herein;

• general economic and market conditions (including inflation, interest rates, foreign currency exchange rates, prevailing credit terms and the depth and duration of a recession) and conditions specific to the reinsurance and insurance markets (including the length and magnitude of the current “soft” market) in which we operate;

• competition, including increased competition, on the basis of pricing, capacity, coverage terms or other factors;

• developments in the world’s financial and capital markets and our access to such markets;

• our ability to successfully enhance, integrate and maintain operating procedures (including information technology) to effectively support our current and new business;

• the loss of key personnel;

• the integration of businesses we have acquired or may acquire into our existing operations;

• accuracy of those estimates and judgments utilized in the preparation of our financial statements, including those related to revenue recognition, insurance and other reserves, reinsurance recoverables, investment valuations, intangible assets, bad debts, income taxes, contingencies and litigation, and any determination to use the deposit method of accounting, which for a relatively new insurance and reinsurance company, like our company, are even more difficult to make than those made in a mature company since relatively limited historical information has been reported to us through June 30, 2013;

• greater than expected loss ratios on business written by us and adverse development on claim and/or claim expense liabilities related to business written by our insurance and reinsurance subsidiaries;

• severity and/or frequency of losses;

• claims for natural or man-made catastrophic events in our insurance or reinsurance business could cause large losses and substantial volatility in our results of operations;

• acts of terrorism, political unrest and other hostilities or other unforecasted and unpredictable events;

• availability to us of reinsurance to manage our gross and net exposures and the cost of such reinsurance;

• the failure of reinsurers, managing general agents, third party administrators or others to meet their obligations to us;

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• the timing of loss payments being faster or the receipt of reinsurance recoverables being slower than anticipated by us;

• our investment performance, including legislative or regulatory developments that may adversely affect the fair value of our investments;

• the impact of the continued weakness of the U.S., European countries or other key economies, projected budget deficits for the U.S., European countries and other governments and the consequences associated with possible additional downgrades of securities of the U.S., European countries and other governments by credit rating agencies, and the resulting effect on the value of securities in our investment portfolio as well as the uncertainty in the market generally;

• losses relating to aviation business and business produced by a certain managing underwriting agency for which we may be liable to the purchaser of its prior reinsurance business or to others in connection with the May 5, 2000 asset sale described in our periodic reports filed with the SEC;

• changes in accounting principles or policies or in our application of such accounting principles or policies;

• changes in the political environment of certain countries in which we operates, underwrites business or invests;

• statutory or regulatory developments, including as to tax policy matters and insurance and other regulatory matters such as the adoption of proposed legislation that would affect Bermuda-headquartered companies and/or Bermuda-based insurers or reinsurers and/or changes in regulations or tax laws applicable to us, our subsidiaries, brokers or customers; and

• the other matters set forth under Item 1A “Risk Factors”, Item 7 “Management’s Discussion and Analysis of Financial Condition and Results of Operations” and other sections of our Annual Report on Form 10-K, as well as the other factors set forth in our other documents on file with the SEC, and management’s response to any of the aforementioned factors.

All subsequent written and oral forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these cautionary statements. The foregoing review of important factors should not be construed as exhaustive and should be read in conjunction with other cautionary statements that are included herein or elsewhere. We undertake no obligation to publicly update or revise any forward-looking statement, whether as a result of new information, future events or otherwise.

Other Financial Information

The consolidated financial statements as of June 30, 2013 and for the three month and six month periods ended June 30, 2013 and 2012 have been reviewed by PricewaterhouseCoopers LLP, an independent registered public accounting firm. Their report (dated August 9, 2013) is included on page 2. The report of PricewaterhouseCoopers LLP states that they did not audit and they do not express an opinion on that unaudited financial information. Accordingly, the degree of reliance on their report on such information should be restricted in light of the limited nature of the review procedures applied. PricewaterhouseCoopers LLP is not subject to the liability provisions of Section 11 of the Securities Act of 1933 for their report on the unaudited financial information because that report is not a “report” or a “part” of the registration statement prepared or certified by PricewaterhouseCoopers LLP within the meaning of Sections 7 and 11 of the Securities Act of 1933.

ITEM 3.  QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

Reference is made to the information appearing above under the subheading “Market Sensitive Instruments and Risk Management” under the caption “Management’s Discussion and Analysis of Financial Condition and Results of Operations,” which information is hereby incorporated by reference.

ITEM 4.  CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

In connection with the filing of this Form 10-Q, our management, including the Chief Executive Officer and Chief Financial Officer, conducted an evaluation of the effectiveness of disclosure controls and procedures pursuant to applicable Exchange Act Rules as of the end of the period covered by this report. Based on that evaluation, the Chief Executive Officer

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and Chief Financial Officer concluded that the disclosure controls and procedures were effective as of the end of and during the period covered by this report with respect to information being recorded, processed, summarized and reported within time periods specified in the SEC’s rules and forms and with respect to timely communication to them and other members of management responsible for preparing periodic reports of all material information required to be disclosed in this report as it relates to ACGL and its consolidated subsidiaries.

We continue to enhance our operating procedures and internal controls to effectively support our business and our regulatory and reporting requirements. Our management does not expect that our disclosure controls or our internal controls will prevent all errors and all fraud. A control system, no matter how well conceived and operated, can provide only reasonable, not absolute, assurance that the objectives of the control system are met. Further, the design of a control system must reflect the fact that there are resource constraints, and the benefits of controls must be considered relative to their costs. As a result of the inherent limitations in all control systems, no evaluation of controls can provide absolute assurance that all control issues and instances of fraud, if any, within the company have been detected. These inherent limitations include the realities that judgments in decision-making can be faulty, and that breakdowns can occur because of simple error or mistake. Additionally, controls can be circumvented by the individual acts of some persons or by collusion of two or more people. The design of any system of controls also is based in part upon certain assumptions about the likelihood of future events, and there can be no assurance that any design will succeed in achieving its stated goals under all potential future conditions; over time, controls may become inadequate because of changes in conditions, or the degree of compliance with the policies or procedures may deteriorate. As a result of the inherent limitations in a cost-effective control system, misstatement due to error or fraud may occur and not be detected. Accordingly, our disclosure controls and procedures are designed to provide reasonable, not absolute, assurance that the disclosure controls and procedures are met.

Changes in Internal Controls Over Financial Reporting

There have been no changes in internal control over financial reporting that occurred during the fiscal quarter ended June 30, 2013 that have materially affected, or are reasonably likely to materially affect, internal control over financial reporting.

PART II.  OTHER INFORMATION

Item 1.  Legal Proceedings

We, in common with the insurance industry in general, are subject to litigation and arbitration in the normal course of our business. As of June 30, 2013, we were not a party to any litigation or arbitration which is expected by management to have a material adverse effect on our results of operations and financial condition and liquidity.

Item 2.  Unregistered Sales of Equity Securities and Use of Proceeds

The following table summarizes our purchases of our common shares for the 2013 second quarter:

(U.S. dollars in thousands, except share data)	Issuer Purchases of Equity Securities
Period	Total Number of Shares Purchased (1)	Average Price  Paid per Share		Total Number of Shares Purchased as Part of  Publicly Announced Plans or Programs (2)	Approximate  Dollar Value  of Shares that May Yet be Purchased Under the Plan or Programs
4/1/2013 - 4/30/2013	1,069	$	51.85	—	$	728,947
5/1/2013 - 5/31/2013	155,661	53.24		—	$	728,947
6/1/2013 - 6/30/2013	315,511	50.41		307,659	$	713,448
Total	472,241	$	51.35	307,659	$	713,448

_________________________________________________

(1) Includes repurchases by ACGL of shares, from time to time, from employees in order to facilitate the payment of withholding taxes on restricted shares granted and the exercise of stock appreciation rights. We purchased these shares at their fair value, as determined by reference to the closing price of our common shares on the day the restricted shares vested or the stock appreciation rights were exercised.

(2) The board of directors of ACGL has authorized the investment in ACGL’s common shares through a share repurchase program. Repurchases under the program may be effected from time to time in open market or privately negotiated transactions through December 2014. Since the inception of the share repurchase program, ACGL has repurchased 109.9 million common shares for an aggregate purchase price of $2.79 billion. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.

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Item 5.  Other Information

In accordance with Section 10a(i)(2) of the Securities Exchange Act of 1934, as amended, we are responsible for disclosing non-audit services to be provided by our independent auditor, PricewaterhouseCoopers LLP, which are approved by the Audit Committee of our board of directors. During the 2013 second quarter, the Audit Committee approved engagements of PricewaterhouseCoopers LLP for permitted non-audit services, which consisted of tax consulting services, tax compliance services and other accounting consulting services.

Item 6.  Exhibits

Exhibit No.	Description
10.1	Restricted Share Agreement with Arch Capital Group Ltd. substantially in the form signed by the Non-Employee Directors of Arch Capital Group Ltd. for May 9, 2013 grants
10.2	Restricted Share Agreement with Arch Capital Group Ltd. substantially in the form signed by each of Constantine Iordanou, Marc Grandisson, W. Preston Hutchings and Louis T. Petrillo for November 12, 2012 grants
10.3	Share Appreciation Right Agreement with Arch Capital Group Ltd. substantially in the form signed by each of Constantine Iordanou, Marc Grandisson, W. Preston Hutchings and Louis T. Petrillo for November 12, 2012 grants
10.4	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and David McElroy
10.5	Restricted Share Unit Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and David McElroy
10.6	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.7	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.8	Restricted Share Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.9	Restricted Share Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.10	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Constantine Iordanou
10.11	Amendment No. 1, dated as of May 31, 2013, to Asset Purchase Agreement, dated as of February 7, 2013, by and among the Receiver of PMI Mortgage Insurance Co. in Rehabilitation on behalf of PMI Mortgage Insurance Co., Arch U.S. MI Services, Inc. and Arch Capital Group (U.S.) Inc.*
10.12	Amendment No. 1, dated as of May 31, 2013, to Stock Purchase Agreement, dated as of February 7, 2013, by and among the Receiver of PMI Mortgage Insurance Co. in Rehabilitation on behalf of PMI Mortgage Insurance Co., CMFG Life Insurance Company, CMG Mortgage Insurance Company, Arch U.S. MI Services, Inc. and Arch Capital Group (U.S.) Inc.*
15	Accountants’ Awareness Letter (regarding unaudited interim financial information)
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	The following financial information from Arch Capital Group Ltd.’s Quarterly Report for the quarter ended June 30, 2013 formatted in XBRL: (i) Consolidated Balance Sheets at June 30, 2013 and December 31, 2012; (ii) Consolidated Statements of Income for the three and six month periods ended June 30, 2013 and 2012; (iii) Consolidated Statements of Comprehensive Income for the three and six month periods ended June 30, 2013 and 2012; (iv) Consolidated Statements of Changes in Shareholders’ Equity for the six month periods ended June 30, 2013 and 2012; (v) Consolidated Statements of Cash Flows for the six month periods ended June 30, 2013 and 2012; and (vi) Notes to Consolidated Financial Statements.**

_________________________________________________

* Filed as an exhibit to our Report on Form 8-K, as filed with the SEC on June 5, 2013, and incorporated by reference.

** This exhibit will not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 (15 U.S.C. 78r) , or otherwise subject to the liability of that section. Such exhibit will not be deemed to be incorporated by reference into any filing under the Securities Act or Securities Exchange Act, except to the extent that Arch Capital Group Ltd. specifically incorporates it by reference.

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SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

	ARCH CAPITAL GROUP LTD.
	(REGISTRANT)
	/s/ Constantine Iordanou
Date: August 9, 2013	Constantine Iordanou
	President and Chief Executive Officer (Principal Executive Officer) and Chairman of the Board of Directors
	/s/ Mark D. Lyons
Date: August 9, 2013	Mark D. Lyons
	Executive Vice President, Chief Financial Officer and Treasurer (Principal Financial and Accounting Officer)

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EXHIBIT INDEX

Exhibit No.	Description
10.1	Restricted Share Agreement with Arch Capital Group Ltd. substantially in the form signed by the Non-Employee Directors of Arch Capital Group Ltd. for May 9, 2013 grants
10.2	Restricted Share Agreement with Arch Capital Group Ltd. substantially in the form signed by each of Constantine Iordanou, Marc Grandisson, W. Preston Hutchings and Louis T. Petrillo for November 12, 2012 grants
10.3	Share Appreciation Right Agreement with Arch Capital Group Ltd. substantially in the form signed by each of Constantine Iordanou, Marc Grandisson, W. Preston Hutchings and Louis T. Petrillo for November 12, 2012 grants
10.4	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and David McElroy
10.5	Restricted Share Unit Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and David McElroy
10.6	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.7	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.8	Restricted Share Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.9	Restricted Share Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Mark D. Lyons
10.10	Share Appreciation Right Agreement, dated as of September 6, 2012, between Arch Capital Group Ltd. and Constantine Iordanou
10.11	Amendment No. 1, dated as of May 31, 2013, to Asset Purchase Agreement, dated as of February 7, 2013, by and among the Receiver of PMI Mortgage Insurance Co. in Rehabilitation on behalf of PMI Mortgage Insurance Co., Arch U.S. MI Services, Inc. and Arch Capital Group (U.S.) Inc.*
10.12	Amendment No. 1, dated as of May 31, 2013, to Stock Purchase Agreement, dated as of February 7, 2013, by and among the Receiver of PMI Mortgage Insurance Co. in Rehabilitation on behalf of PMI Mortgage Insurance Co., CMFG Life Insurance Company, CMG Mortgage Insurance Company, Arch U.S. MI Services, Inc. and Arch Capital Group (U.S.) Inc.*
15	Accountants’ Awareness Letter (regarding unaudited interim financial information)
31.1	Certification of Chief Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
31.2	Certification of Chief Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002
32.1	Certification of Chief Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
32.2	Certification of Chief Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002
101	The following financial information from Arch Capital Group Ltd.’s Quarterly Report for the quarter ended June 30, 2013 formatted in XBRL: (i) Consolidated Balance Sheets at June 30, 2013 and December 31, 2012; (ii) Consolidated Statements of Income for the three and six month periods ended June 30, 2013 and 2012; (iii) Consolidated Statements of Comprehensive Income for the three and six month periods ended June 30, 2013 and 2012; (iv) Consolidated Statements of Changes in Shareholders’ Equity for the six month periods ended June 30, 2013 and 2012; (v) Consolidated Statements of Cash Flows for the six month periods ended June 30, 2013 and 2012; and (vi) Notes to Consolidated Financial Statements.**

_________________________________________________

* Filed as an exhibit to our Report on Form 8-K, as filed with the SEC on June 5, 2013, and incorporated by reference.

** This exhibit will not be deemed “filed” for the purposes of Section 18 of the Securities Exchange Act of 1934 (15 U.S.C. 78r) , or otherwise subject to the liability of that section. Such exhibit will not be deemed to be incorporated by reference into any filing under the Securities Act or Securities Exchange Act, except to the extent that Arch Capital Group Ltd. specifically incorporates it by reference.

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EX-10.1

Exhibit 10.1

ARCH CAPITAL GROUP LTD.
Restricted Share Agreement

THIS AGREEMENT, dated as of May 9, 2013, between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and __ (the “Director”).

WHEREAS, the following terms reflect the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows.

1.Award of Shares.  Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Director is hereby awarded 1,401 Restricted Shares (the “Award”), subject to the terms and conditions herein set forth. Capitalized terms used herein and not defined shall have the meanings set forth in the Plan. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

2.Terms and Conditions.  It is understood and agreed that the Award of Restricted Shares evidenced hereby is subject to the following terms and conditions:

(a)Vesting of Award. Subject to Section 2(b) below and the other terms and conditions of this Agreement, this Award shall become vested on May 8, 2014. Unless otherwise provided by the Company, all dividends and other amounts receivable in connection with any adjustments to the Shares under Section 4(c) of the Plan shall be subject to the vesting schedule in this Section 2(a). Notwithstanding the foregoing, if a Change in Control occurs and the Director ceases to be a director of the Company for any reason, then the Restricted Shares shall become immediately vested in full upon such termination of service.

“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for

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election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(b)    Termination of Service; Forfeiture of Unvested Shares. Except as otherwise set forth in Section 2(a) above, in the event the Director ceases to be a director of the Company prior to the date the Restricted Shares otherwise become vested due to his or her death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan), the Restricted Shares shall become immediately vested in full upon such termination of service. If the Director ceases to be a director of the Company for any other reason prior to the date the Restricted Shares become vested, the Award shall be forfeited by the Director and become the property of the Company.

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(c)Certificates.  Each certificate issued in respect of Restricted Shares awarded hereunder shall be issued in book entry format with the Company’s transfer agent and shall bear a legend disclosing the restrictions on transferability imposed on such Restricted Shares by this Agreement (the “Restrictive Legend”). Upon the vesting of Restricted Shares pursuant to Section 2(a) hereof and the satisfaction of any withholding tax liability pursuant to Section 5 hereof, such vested Shares, not bearing the Restrictive Legend, shall be delivered to the Director.

(d)Rights of a Stockholder.  Prior to the time a Restricted Share is fully vested hereunder, the Director shall have no right to transfer, pledge, hypothecate or otherwise encumber such Restricted Shares. During such period, the Director shall have all other rights of a stockholder, including, but not limited to, the right to vote and to receive dividends (subject to Section 2(a) hereof) at the time paid on such Restricted Shares.

(e)    No Right to Continued Services. This Award shall not confer upon the Director any right with respect to continuance of services with the Company nor shall this Award interfere with the right of the Company to terminate the Director’s services at any time.

3.Transfer of Shares. The Shares delivered hereunder, or any interest therein, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws or any other applicable laws or regulations and the terms and conditions hereof.

4.Expenses of Issuance of Shares. The issuance of stock certificates hereunder shall be without charge to the Director. The Company shall pay, and indemnify the Director from and against any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) or by reason of the issuance of Shares.

5.Withholding. No later than the date of vesting of (or the date of an election by the Director under Section 83(b) of the Code with respect to) the Award granted hereunder, the Director shall make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld at such time with respect to such Award and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the Director, federal, state and local taxes of any kind required by law to be withheld at such time.

6.References.  References herein to rights and obligations of the Director shall apply, where appropriate, to the Director’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this Agreement.

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7.Notices.  Any notice required or permitted to be given under this Agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

If to the Company:

Arch Capital Group Ltd.Wessex House

45 Reid StreetHamilton HM 12, Bermuda Attn.: Secretary

If to the Director:

To the last address delivered to the Company by the Director in the manner set forth herein.

8.Governing Law.  This Agreement shall be governed by and construed in accordance with the laws of the State of New York, without giving effect to principles of conflict of laws.

9.Entire Agreement. This Agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this Agreement and the Plan.

10.Counterparts.  This Agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above written.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson        Dawna Ferguson

Secretary

[/s/ Director’s signature]        

EX-10.2

Exhibit 10.2

ARCH CAPITAL GROUP LTD.
Restricted Share Agreement

THIS AGREEMENT, dated as of November 12, 2012, between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and _____ (the “Employee”).

WHEREAS, the Employee has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows.

1.Award of Shares.  Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Employee is hereby awarded ______ Restricted Shares (the “Award”), subject to the terms and conditions herein set forth. Capitalized terms used herein and not defined shall have the meanings set forth in the Plan. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

2.    Terms and Conditions.  It is understood and agreed that the Award of Restricted Shares evidenced hereby is subject to the following terms and conditions:

(a)Vesting of Award. Subject to Section 2(b) below and the other terms and conditions of this Agreement, this Award shall become vested in one installment on the fifth anniversary of the date hereof. Unless otherwise provided by the Company, all dividends and other amounts receivable in connection with any adjustments to the Shares under Section 4(c) of the Plan shall be subject to the vesting schedule in this Section 2(a).

(b)Termination of Service; Forfeiture of Unvested Shares.

(i)In the event the Employee ceases to be an employee of the Company prior to the date the Restricted Shares otherwise become vested due to his or her death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Shares shall become immediately vested in full upon such termination of employment.

(ii)In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, and other than as set forth in Section 2(b)(i), (iii) or (iv) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Applicable Percentage (as defined below) of the Restricted Shares shall continue to vest on the schedule set forth in Section 2(a) above so long as the Employee does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”). In the event

the Employee engages in a Competitive Activity, any unvested Restricted Shares shall be forfeited by the Employee and become the property of the Company. The “Applicable Percentage” of the Restricted Shares will be equal to the number of full years elapsed from the date hereof through the date of such termination of employment, divided by five. The remaining portion of the Restricted Shares shall be immediately forfeited upon such termination of employment.

(iii)In the event the Employee ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement, dated as of ____, between the Employee and the Company (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the Restricted Shares, to the extent not already vested, shall become immediately vested in full upon such termination of employment.

(iv)In the event the Employee ceases to be an employee of the Company, other than as set forth in Section 2(b)(iii) above, due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement), a pro rata number of the Restricted Shares subject to the Award, if not already vested, shall become vested upon such termination of service determined by multiplying the total number of Restricted Shares subject to the Award by a fraction, the numerator of which is the number of full years elapsed since the date hereof through the Employee’s termination date and the denominator of which is five. Any of the Restricted Shares subject to the Award that are not vested, and do not become vested, at the time of termination shall be immediately forfeited.

(v)If the Employee ceases to be an Employee of the Company for any other reason prior to the date the Restricted Shares become vested, the Award shall be forfeited by the Employee and become the property of the Company.

(vi)For purposes of this Agreement, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

(vii)“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for

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election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(c)Certificates.  Each certificate issued in respect of Restricted Shares awarded hereunder shall be issued in book entry format with the Company’s transfer agent and shall bear a legend disclosing the restrictions on transferability imposed on such Restricted Shares by this Agreement (the “Restrictive Legend”). Upon the vesting of Restricted Shares pursuant to Section 2 hereof and the satisfaction of any withholding tax liability pursuant to Section 5 hereof, such vested Shares, not bearing the Restrictive Legend, shall be delivered to the Employee.

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(d)Rights of a Stockholder.  Prior to the time a Restricted Share is fully vested hereunder, the Employee shall have no right to transfer, pledge, hypothecate or otherwise encumber such Restricted Share. During such period, the Employee shall have all other rights of a stockholder, including, but not limited to, the right to vote and to receive dividends (subject to Section 2(a) hereof) at the time paid on such Restricted Shares.

(e)No Right to Continued Employment. This Award shall not confer upon the Employee any right with respect to continuance of employment by the Company nor shall this Award interfere with the right of the Company to terminate the Employee’s employment at any time.

3.Transfer of Shares. The Shares delivered hereunder, or any interest therein, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws or any other applicable laws or regulations and the terms and conditions hereof.

4.Expenses of Issuance of Shares. The issuance of stock certificates hereunder shall be without charge to the Employee. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) or by reason of the issuance of Shares.

5.Withholding. No later than the date of vesting of (or the date of an election by the Employee under Section 83(b) of the Code with respect to) the Award granted hereunder, the Employee shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld at such time with respect to such Award and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the Employee, federal, state and local taxes of any kind required by law to be withheld at such time.

6.References.  References herein to rights and obligations of the Employee shall apply, where appropriate, to the Employee’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this Agreement.

7.Notices.  Any notice required or permitted to be given under this Agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

If to the Company:

Arch Capital Group Ltd.
Wessex House
45 Reid Street

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Hamilton HM 12 Bermuda
Attn.: Secretary

If to the Employee:

To the last address delivered to the Company by the
Employee in the manner set forth herein.

8.Governing Law.  This Agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws.

9.Entire Agreement. This Agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this Agreement and the Plan.

10.Counterparts.  This Agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above written.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson
Title: Secretary

[/s/ employee signature]    

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EX-10.3

Exhibit 10.3

ARCH CAPITAL GROUP LTD.
Share Appreciation Right Agreement

AGREEMENT, made and entered into this 12th day of November, 2012, by and between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and ____ (the “SAR Holder”).

WHEREAS, the SAR Holder has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the Company and the SAR Holder agree as follows:

(a)Grant. Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Company hereby grants to the SAR Holder a Share Appreciation Right (the “SAR”) with respect to ____ Shares. The SAR represents a right to be paid, upon exercise of the SAR, an amount measured by (x) the difference between the Fair Market Value per Share on the date of exercise and the exercise price per Share of the SAR, multiplied by (y) the number of Shares with respect to which the SAR is exercised, with such amount to be paid in the form of Shares valued at their Fair Market Value on the date of exercise. The SAR is granted as of November 12, 2012 (the “Date of Grant”), and such grant is subject to the terms and conditions herein and the terms and conditions of the Plan. In the event there is any conflict between the terms of the Plan and this Agreement, the terms of the Plan shall control. Capitalized terms used herein but not defined shall have the meanings given to them in the Plan.

(b)Exercise Price. The exercise price of the SAR shall be equal to $42.65 per Share.

(c)Status of Shares. Upon issue, the shares received upon exercise of the SAR shall rank equally in all respects with the other Shares.

(d)Term of SAR. The SAR may be exercised only during the period (the “SAR Period”) set forth in paragraph (f) below and shall remain exercisable until the tenth anniversary of the Date of Grant. Thereafter, the SAR Holder shall cease to have any rights in respect thereof. The right to exercise the SAR shall be subject to sooner termination as provided in paragraph (j) below.

(e)No Rights of Shareholder. The SAR Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or in equity.

(f)Exercisability. Except as otherwise set forth in paragraph (j) below, the SAR shall become exercisablein one installment on the fifth anniversary of the Date of Grant, subject to paragraph (j) below. Subject to paragraph (j) below, the SAR may be exercised at any time or from time to time during the SAR Period in regard to all or any portion of the SAR which is then exercisable, as may be adjusted pursuant to paragraph (g) below.

(g)Anti-dilution Adjustment. For the avoidance of doubt, the terms of Section 4(c) of the Plan, relating to anti-dilution adjustments, will apply to the SAR.

(h)Nontransferability. The SAR, or any interest therein, may not be assigned or otherwise transferred, disposed of or encumbered by the SAR Holder, other than by will or by the laws of descent and distribution. During the lifetime of the SAR Holder, the SAR shall be exercisable only by the SAR Holder or by his or her guardian or legal representative. Notwithstanding the foregoing, the SAR may be transferred by the SAR Holder to members of his or her “immediate family” or to a trust or other entity established for the exclusive benefit of solely one or more members of the SAR Holder’s “immediate family.” Any SAR held by the transferee will continue to be subject to the same terms and conditions that were applicable to the SAR immediately prior to the transfer, except that the SAR will be transferable by the transferee only by will or the laws of descent and distribution. For purposes hereof, “immediate family” means the SAR Holder’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouse, siblings (including half brother and sisters), in laws, and relationships arising because of legal adoption.

(i)Exercise of SAR. In order to exercise the SAR, the SAR Holder shall submit to the Company an instrument specifying the whole number of Shares in respect of which the SAR is being exercised. Shares will be issued accordingly by the Company within 30 days. The payment upon a SAR exercise shall be solely the number of whole Shares calculated in paragraph (a) above. Fractional Shares shall be rounded down to the nearest whole Share with no cash consideration being paid upon exercise. Anything to the contrary herein notwithstanding, the Company shall not be obligated to issue any Shares hereunder if the issuance of such Shares would violate the provision of any applicable law, in which event the Company shall, as soon as practicable, take whatever action it reasonably can so that such Shares may be issued without resulting in such violations of law.

(j)Termination of Service.

1.In the event the SAR Holder ceases to be an employee of the Company due to the SAR Holder’s death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for a period of three years following such termination of employment (but not beyond the SAR Period).

2.In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation

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Plan on the date hereof, and other than as set forth in paragraphs (j)(1), (j)(3) or (j)(4) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Applicable Percentage (as defined below) of the SAR shall continue to become exercisable on the schedule set forth in paragraph (f) above so long as the SAR Holder does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”) and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for the remainder of the SAR Period. In the event the SAR Holder engages in a Competitive Activity, (A) the SAR, to the extent then exercisable, may be exercised for 30 days following the date on which the SAR Holder engages in such Competitive Activity (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited. The “Applicable Percentage” of the SAR will be equal to the number of full years elapsed from the Date of Grant through the date of such termination of employment, divided by five. The remaining portion of the SAR shall be immediately forfeited upon such termination of employment.

3.In the event the SAR Holder ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason (as defined in the Employment Agreement, dated as of _______, between the SAR Holder and the Company (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period).

4.In the event the SAR Holder ceases to be an employee of the Company, other than as set forth in paragraph (j)(3) above, due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason (as defined in the Employment Agreement), the SAR, if not already exercisable, shall become immediately exercisable at the time of such termination of service with respect to a number of Shares determined by multiplying the total number of Shares subject to the SAR by a fraction, the numerator of which is the number of full years elapsed from the Date of Grant through the SAR Holder’s termination date and the denominator of which is five, and the portion of the SAR that is exercisable shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period). Any portion of the SAR that is not exercisable, and does not become exercisable, at the time of termination shall be immediately forfeited.

5.In the event that the SAR Holder ceases to be an employee of the Company for any other reason, except due to a termination of the SAR Holder’s employment by the Company for Cause, (A) the SAR, to the extent then exercisable,

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may be exercised for 90 days following termination of employment (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

6.In the event of a termination of the SAR Holder’s employment for Cause, the SAR shall immediately cease to be exercisable and shall be immediately forfeited.

7.For purposes of this SAR, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

8.“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an

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employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(k)     Obligations as to Capital. The Company agrees that it will at all times maintain authorized and unissued share capital sufficient to fulfill all of its obligations under the SAR.

(l)     Transfer of Shares. The SAR, the Shares issued hereunder, or any interest in either, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws and the terms and conditions hereof.

(m)    Expenses of Issuance of Shares. The issuance of stock certificates upon the exercise of the SAR in whole or in part, shall be without charge to the SAR Holder. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) by reason of the exercise of the SAR in whole or in part or the resulting issuance of Shares hereunder.

(n)    Withholding. No later than the date of exercise of the SAR granted hereunder, the SAR Holder shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld upon the exercise of such SAR and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the SAR Holder, federal, state and local taxes of any kind required by law to be withheld upon the exercise of such SAR.

(o)    References. References herein to rights and obligations of the SAR Holder shall apply, where appropriate, to the SAR Holder’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this SAR.

(p)    Notices. Any notice required or permitted to be given under this agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

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If to the Company:

Arch Capital Group Ltd.:

Wessex House
45 Reid Street
Hamilton HM 12 Bermuda
Attn: Secretary

If to the SAR Holder:

The last address delivered to the Company by the SAR Holder in the manner set forth herein.

(q)    Governing Law. This agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws thereof.

(r)    Entire Agreement. This agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this agreement and the Plan.

(s)    Counterparts. This agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this agreement as of the Date of Grant.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson
Title: Secretary

[/s/ employee signature]    

7

9515198v2

EX-10.4

Exhibit 10.4

ARCH CAPITAL GROUP LTD.Share Appreciation Right Agreement

AGREEMENT, made and entered into this 6^th day of September 2012, by and between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and David McElroy (the “SAR Holder”).

WHEREAS, the SAR Holder has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the Company and the SAR Holder agree as follows:

(a)Grant. Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Company hereby grants to the SAR Holder a Share Appreciation Right (the “SAR”) with respect to 25,000 Shares. The SAR represents a right to be paid, upon exercise of the SAR, an amount measured by (x) the difference between the Fair Market Value per Share on the date of exercise and the exercise price per Share of the SAR, multiplied by (y) the number of Shares with respect to which the SAR is exercised, with such amount to be paid in the form of Shares valued at their Fair Market Value on the date of exercise. The SAR is granted as of September 6, 2012 (the “Date of Grant”), and such grant is subject to the terms and conditions herein and the terms and conditions of the Plan. In the event there is any conflict between the terms of the Plan and this Agreement, the terms of the Plan shall control. Capitalized terms used herein but not defined shall have the meanings given to them in the Plan.

(b)Exercise Price. The exercise price of the SAR shall be equal to $40.10 per Share.

(c)Status of Shares. Upon issue, the shares received upon exercise of the SAR shall rank equally in all respects with the other Shares.

(d)Term of SAR. The SAR may be exercised only during the period (the “SAR Period”) set forth in paragraph (f) below and shall remain exercisable until the tenth anniversary of the Date of Grant. Thereafter, the SAR Holder shall cease to have any rights in respect thereof. The right to exercise the SAR shall be subject to sooner termination as provided in paragraph (j) below.

(e)No Rights of Shareholder. The SAR Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or in equity.

(f)Exercisability. Except as otherwise set forth in paragraph (j) below, the SAR shall become exercisablein one installment on the fifth anniversary of the Date of Grant, subject to paragraph (j) below. Subject to paragraph (j) below, the SAR may be exercised at any time or from time to time during the SAR Period in regard to all or any portion of the SAR which is then exercisable, as may be adjusted pursuant to paragraph (g) below.

(g)Anti-dilution Adjustment. For the avoidance of doubt, the terms of Section 4(c) of the Plan, relating to anti-dilution adjustments, will apply to the SAR.

(h)Nontransferability. The SAR, or any interest therein, may not be assigned or otherwise transferred, disposed of or encumbered by the SAR Holder, other than by will or by the laws of descent and distribution. During the lifetime of the SAR Holder, the SAR shall be exercisable only by the SAR Holder or by his or her guardian or legal representative. Notwithstanding the foregoing, the SAR may be transferred by the SAR Holder to members of his or her “immediate family” or to a trust or other entity established for the exclusive benefit of solely one or more members of the SAR Holder’s “immediate family.” Any SAR held by the transferee will continue to be subject to the same terms and conditions that were applicable to the SAR immediately prior to the transfer, except that the SAR will be transferable by the transferee only by will or the laws of descent and distribution. For purposes hereof, “immediate family” means the SAR Holder’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouse, siblings (including half brother and sisters), in laws, and relationships arising because of legal adoption.

(i)Exercise of SAR. In order to exercise the SAR, the SAR Holder shall submit to the Company an instrument specifying the whole number of Shares in respect of which the SAR is being exercised. Shares will be issued accordingly by the Company within 30 days. The payment upon a SAR exercise shall be solely the number of whole Shares calculated in paragraph (a) above. Fractional Shares shall be rounded down to the nearest whole Share with no cash consideration being paid upon exercise. Anything to the contrary herein notwithstanding, the Company shall not be obligated to issue any Shares hereunder if the issuance of such Shares would violate the provision of any applicable law, in which event the Company shall, as soon as practicable, take whatever action it reasonably can so that such Shares may be issued without resulting in such violations of law.

(j)Termination of Service.

1.In the event the SAR Holder ceases to be an employee of the Company due to the SAR Holder’s death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for a period of three years following such termination of employment (but not beyond the SAR Period).

2

2.In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, and other than as set forth in paragraphs (j)(1), (j)(3) or (j)(4) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR shall continue to become exercisable on the schedule set forth in paragraph (f) above so long as the SAR Holder does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”) and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for the remainder of the SAR Period. In the event the SAR Holder engages in a Competitive Activity, (A) the SAR, to the extent then exercisable, may be exercised for 30 days following the date on which the SAR Holder engages in such Competitive Activity (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

3.In the event the SAR Holder ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason (as defined in the Employment Agreement, dated as of June 5, 2009 and as amended on July 25, 2012, between the SAR Holder and Arch Insurance Group Inc. (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period).

4.In the event the SAR Holder ceases to be an employee of the Company, other than as set forth in paragraph (j)(3) above, due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason as defined in the Employment Agreement, the SAR, if not already exercisable, shall become immediately exercisable at the time of such termination of service with respect to a number of Shares determined by multiplying the total number of Shares subject to the SAR by a fraction, the numerator of which is the number of full years elapsed from the Date of Grant through the SAR Holder’s termination date and the denominator of which is five, and the portion of the SAR that is exercisable shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period). Any portion of the SAR that is not exercisable, and does not become exercisable, at the time of termination shall be immediately forfeited.

5.In the event that the SAR Holder ceases to be an employee of the Company for any other reason, except due to a termination of the SAR Holder’s employment by the Company for Cause, (A) the SAR, to the extent then exercisable, may be exercised for 90 days following termination of employment (but not beyond the

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SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

6.In the event of a termination of the SAR Holder’s employment for Cause, the SAR shall immediately cease to be exercisable and shall be immediately forfeited.

7.For purposes of this SAR, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

8.“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned

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subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(k)     Obligations as to Capital. The Company agrees that it will at all times maintain authorized and unissued share capital sufficient to fulfill all of its obligations under the SAR.

(l)     Transfer of Shares. The SAR, the Shares issued hereunder, or any interest in either, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws and the terms and conditions hereof.

(m)    Expenses of Issuance of Shares. The issuance of stock certificates upon the exercise of the SAR in whole or in part, shall be without charge to the SAR Holder. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) by reason of the exercise of the SAR in whole or in part or the resulting issuance of Shares hereunder.

(n)    Withholding. No later than the date of exercise of the SAR granted hereunder, the SAR Holder shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld upon the exercise of such SAR and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the SAR Holder, federal, state and local taxes of any kind required by law to be withheld upon the exercise of such SAR.

(o)    References. References herein to rights and obligations of the SAR Holder shall apply, where appropriate, to the SAR Holder’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this SAR.

(p)    Notices. Any notice required or permitted to be given under this agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

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If to the Company:

Arch Capital Group Ltd.:

Wessex House
45 Reid StreetHamilton HM 12 Bermuda
Attn: Secretary

If to the SAR Holder:

The last address delivered to the Company by the SAR Holder in the manner set forth herein.

(q)    Governing Law. This agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws thereof.

(r)    Entire Agreement. This agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this agreement and the Plan.

(s)    Counterparts. This agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this agreement as of the Date of Grant.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    Name: Dawna Ferguson

Title: Secretary

/s/ David McElroy    
David McElroy

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EX-10.5

Exhibit 10.5

ARCH CAPITAL GROUP LTD.Restricted Share Unit Agreement

THIS AGREEMENT, dated as of September 6, 2012, between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and David McElroy (the “Employee”).

WHEREAS, the Employee has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows.

1.Award of Share Units.  Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Employee is hereby awarded 25,000 Restricted Share Units (the “Award”), subject to the terms and conditions herein set forth. Capitalized terms used herein and not defined shall have the meanings set forth in the Plan. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

2.Terms and Conditions.  It is understood and agreed that the Award of Restricted Share Units evidenced hereby is subject to the following terms and conditions:

(a)Vesting of Award. Subject to Section 2(b) below and the other terms and conditions of this Agreement, this Award shall become vested in one installment on the fifth anniversary of the date hereof. Unless otherwise provided by the Company, all amounts receivable in connection with any adjustments to the Shares under Section 4(c) of the Plan or Section 2(e) below shall be subject to the vesting schedule in this Section 2(a).

(b)Termination of Service; Forfeiture of Unvested Share Units.

(i)     In the event the Employee ceases to be an employee of the Company prior to the date the Restricted Share Units otherwise become vested due to his or her death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Share Units shall become immediately vested in full upon such termination of employment.

(ii)    In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, and other than as set forth in Section 2(b)(i), (iii) or (iv) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Share Units shall continue to vest on the schedule set forth in Section 2(a) above so long as the Employee does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per

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calendar year (“Competitive Activity”). In the event the Employee engages in a Competitive Activity, any unvested Restricted Share Units shall be forfeited by the Employee and become the property of the Company.

(iii)    In the event the Employee ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement, dated as of June 5, 2009 and as amended on July 25, 2012, between the Employee and Arch Insurance Group Inc. (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the Restricted Share Units, to the extent not already vested, shall become immediately vested in full upon such termination of employment.

(iv)      In the event the Employee ceases to be an employee of the Company, other than as set forth in Section 2(b)(iii) above, due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement), a pro rata number of the Restricted Share Units subject to the Award, if not already vested, shall become vested upon such termination of service determined by multiplying the total number of Restricted Share Units subject to the Award by a fraction, the numerator of which is the number of full years elapsed since the date hereof through the Employee’s termination date and the denominator of which is five. Any of the Restricted Share Units subject to the Award that are not vested, and do not become vested, at the time of termination shall be immediately forfeited.

(v)    If the Employee ceases to be an Employee of the Company for any other reason prior to the date the Restricted Share Units become vested, the unvested Restricted Share Units shall be forfeited by the Employee and become the property of the Company.

(vi)    For purposes of this Agreement, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

(vii)    “Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election

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to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(d)Distribution of Shares. At the time the Employee ceases to be an employee of the Company for any reason prior to attaining Retirement Age, the Company shall distribute to the Employee (or his or her heirs in the event of the Employee’s death) a number of Shares equal to the number of vested Restricted Share Units then held by the Employee. In the event the Employee ceases to be an employee of the Company after attaining Retirement Age, a number of Shares equal to the number of vested Restricted Share Units held by the Employee will be distributed by the Company to the Employee (or his or her heirs in the event of the Employee’s death) at the later of (i) the time the Employee ceases to be an employee of the

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Company, and (ii) the date the Restricted Share Units are scheduled to vest pursuant to the schedule set forth in Section 2(a) above (without regard to any acceleration of such vesting), so long as the Restricted Share Units are not forfeited before such time as provided in Section 2(b).

(e)Rights and Restrictions.  The Restricted Share Units shall not be transferable, other than pursuant to will or the laws of descent and distribution. Prior to vesting of the Restricted Share Units and delivery of the Shares to the Employee following his termination of employment, the Employee shall not have any rights or privileges of a shareholder as to the Shares subject to the Award. Specifically, the Employee shall not have the right to receive dividends or the right to vote such Shares prior to vesting of the Award and delivery of the Shares.

(f)Anti-dilution Adjustment. For the avoidance of doubt, the terms of Section 4(c) of the Plan, relating to anti-dilution adjustments, will apply to the Restricted Share Units.

(g)Dividend Equivalents. As of each date on which a cash dividend is paid on Shares, there shall be granted to the Employee that number of additional Restricted Share Units (including fractional units) determined by (i) multiplying the amount of such dividend per Share by the number of Restricted Share Units held by the Employee, and (ii) dividing the total so determined by the Fair Market Value of a Share on the date of payment of such cash dividend. The Restricted Share Units granted pursuant to this Section 2(f) will have the same terms and conditions (including vesting dates) as the Restricted Share Units with respect to which they are granted.

(h)No Right to Continued Employment. This Award shall not confer upon the Employee any right with respect to continuance of employment by the Company nor shall this Award interfere with the right of the Company to terminate the Employee’s employment at any time.

3.Transfer of Shares. The Shares delivered hereunder, or any interest therein, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws or any other applicable laws or regulations and the terms and conditions hereof.

4.Expenses of Issuance of Shares. The issuance of stock certificates hereunder shall be without charge to the Employee. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) or by reason of the issuance of Shares.

5.Withholding. The Employee shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld with respect to the Award and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind

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otherwise due to the Employee, federal, state and local taxes of any kind required by law to be withheld.

6.References.  References herein to rights and obligations of the Employee shall apply, where appropriate, to the Employee’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this Agreement.

7.Notices.  Any notice required or permitted to be given under this Agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

If to the Company:

Arch Capital Group Ltd.
Wessex House
45 Reid Street
Hamilton HM 12 Bermuda
Attn.: Secretary

If to the Employee:

To the last address delivered to the Company by the
Employee in the manner set forth herein.

8.Governing Law.  This Agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws.

9.Entire Agreement. This Agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this Agreement and the Plan.

10.Counterparts.  This Agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

11.     Section 409A. It is intended that this Agreement and the Award will comply with Section 409A of the Code (and any regulations and guidelines issued thereunder), to the extent the Agreement and Award are subject thereto, and the Agreement shall be interpreted on a basis consistent with such intent. If an amendment of the Agreement is necessary in order for it to comply with Section 409A, the parties hereto will negotiate in good faith to amend the Agreement in a manner that preserves the original intent of the parties to the extent reasonably possible. Notwithstanding any provision of this Agreement to the contrary, for purposes of any provision of this Agreement providing for the distribution of any Shares upon or following a

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termination of employment that is considered deferred compensation under Section 409A, references to the Employee’s “termination of employment” (and corollary terms) with the Company shall be construed to refer to the Employee’s “separation from service” (within the meaning of Treas. Reg. Section 1.409A-1(h)) with the Company. Notwithstanding any provision to the contrary in this Agreement, if the Employee is deemed on the date of his or her “separation from service” (within the meaning of Treas. Reg. Section 1.409A-1(h)) to be a “specified employee” (within the meaning of Treas. Reg. Section 1.409A-1(i)), then with regard to any payment that is considered deferred compensation under Section 409A payable on account of a “separation from service” that is required to be delayed pursuant to Section 409A(a)(2)(B) of the Code (after taking into account any applicable exceptions to such requirement), such payment shall not be made prior to the earlier of (i) the expiration of the six (6)-month period measured from the date of the Employee’s “separation from service,” or (ii) the date of the Employee’s death (the “Delay Period”). Upon the expiration of the Delay Period, all payments delayed pursuant hereto (whether they would have otherwise been payable in a single sum or in installments in the absence of such delay) shall be paid to the Employee in a lump sum and any remaining payments due under this Agreement shall be paid in accordance with the normal payment dates specified for them herein. Whenever payments under this Agreement are to be made in installments, each such installment shall be deemed to be a separate payment for purposes of Section 409A. No action or failure to act, pursuant to this Section 11 shall subject the Company to any claim, liability, or expense, and the Company shall not have any obligation to indemnify or otherwise protect the Employee from the obligation to pay any taxes, interest or penalties pursuant to Section 409A of the Code.

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IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above written.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    Name: Dawna Ferguson

Title: Secretary

/s/ David McElroy    David McElroy

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EX-10.6

Exhibit 10.6

ARCH CAPITAL GROUP LTD.Share Appreciation Right Agreement

AGREEMENT, made and entered into this 6^th day of September 2012, by and between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and Mark D. Lyons (the “SAR Holder”).

WHEREAS, the SAR Holder has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the Company and the SAR Holder agree as follows:

(a)Grant. Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Company hereby grants to the SAR Holder a Share Appreciation Right (the “SAR”) with respect to 60,000 Shares. The SAR represents a right to be paid, upon exercise of the SAR, an amount measured by (x) the difference between the Fair Market Value per Share on the date of exercise and the exercise price per Share of the SAR, multiplied by (y) the number of Shares with respect to which the SAR is exercised, with such amount to be paid in the form of Shares valued at their Fair Market Value on the date of exercise. The SAR is granted as of September 6, 2012 (the “Date of Grant”), and such grant is subject to the terms and conditions herein and the terms and conditions of the Plan. In the event there is any conflict between the terms of the Plan and this Agreement, the terms of the Plan shall control. Capitalized terms used herein but not defined shall have the meanings given to them in the Plan.

(b)Exercise Price. The exercise price of the SAR shall be equal to $40.10 per Share.

(c)Status of Shares. Upon issue, the shares received upon exercise of the SAR shall rank equally in all respects with the other Shares.

(d)Term of SAR. The SAR may be exercised only during the period (the “SAR Period”) set forth in paragraph (f) below and shall remain exercisable until the tenth anniversary of the Date of Grant. Thereafter, the SAR Holder shall cease to have any rights in respect thereof. The right to exercise the SAR shall be subject to sooner termination as provided in paragraph (j) below.

(e)No Rights of Shareholder. The SAR Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or in equity.

(f)Exercisability. Except as otherwise set forth in paragraph (j) below, the SAR shall become exercisablein one installment on the fifth anniversary of the Date of Grant, subject to paragraph (j) below. Subject to paragraph (j) below, the SAR may be exercised at any time or from time to time during the SAR Period in regard to all or any portion of the SAR which is then exercisable, as may be adjusted pursuant to paragraph (g) below.

(g)Anti-dilution Adjustment. For the avoidance of doubt, the terms of Section 4(c) of the Plan, relating to anti-dilution adjustments, will apply to the SAR.

(h)Nontransferability. The SAR, or any interest therein, may not be assigned or otherwise transferred, disposed of or encumbered by the SAR Holder, other than by will or by the laws of descent and distribution. During the lifetime of the SAR Holder, the SAR shall be exercisable only by the SAR Holder or by his or her guardian or legal representative. Notwithstanding the foregoing, the SAR may be transferred by the SAR Holder to members of his or her “immediate family” or to a trust or other entity established for the exclusive benefit of solely one or more members of the SAR Holder’s “immediate family.” Any SAR held by the transferee will continue to be subject to the same terms and conditions that were applicable to the SAR immediately prior to the transfer, except that the SAR will be transferable by the transferee only by will or the laws of descent and distribution. For purposes hereof, “immediate family” means the SAR Holder’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouse, siblings (including half brother and sisters), in laws, and relationships arising because of legal adoption.

(i)Exercise of SAR. In order to exercise the SAR, the SAR Holder shall submit to the Company an instrument specifying the whole number of Shares in respect of which the SAR is being exercised. Shares will be issued accordingly by the Company within 30 days. The payment upon a SAR exercise shall be solely the number of whole Shares calculated in paragraph (a) above. Fractional Shares shall be rounded down to the nearest whole Share with no cash consideration being paid upon exercise. Anything to the contrary herein notwithstanding, the Company shall not be obligated to issue any Shares hereunder if the issuance of such Shares would violate the provision of any applicable law, in which event the Company shall, as soon as practicable, take whatever action it reasonably can so that such Shares may be issued without resulting in such violations of law.

(j)Termination of Service.

1.In the event the SAR Holder ceases to be an employee of the Company due to the SAR Holder’s death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for a period of three years following such termination of employment (but not beyond the SAR Period).

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2.In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, and other than as set forth in paragraphs (j)(1), (j)(3) or (j)(4) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR shall continue to become exercisable on the schedule set forth in paragraph (f) above so long as the SAR Holder does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”) and shall continue to be exercisable by the SAR Holder (or the SAR Holder’s Beneficiary or estate in the event of the SAR Holder’s death) for the remainder of the SAR Period. In the event the SAR Holder engages in a Competitive Activity, (A) the SAR, to the extent then exercisable, may be exercised for 30 days following the date on which the SAR Holder engages in such Competitive Activity (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

3.In the event the SAR Holder ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason (as defined in the Employment Agreement, dated as of July 25, 2012, between the SAR Holder and the Company (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period).

4.In the event the SAR Holder ceases to be an employee of the Company, other than as set forth in paragraph (j)(3) above, due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason as defined in the Employment Agreement, the SAR, if not already exercisable, shall become immediately exercisable at the time of such termination of service with respect to a number of Shares determined by multiplying the total number of Shares subject to the SAR by a fraction, the numerator of which is the number of full years elapsed from the Date of Grant through the SAR Holder’s termination date and the denominator of which is five, and the portion of the SAR that is exercisable shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period). Any portion of the SAR that is not exercisable, and does not become exercisable, at the time of termination shall be immediately forfeited.

5.In the event that the SAR Holder ceases to be an employee of the Company for any other reason, except due to a termination of the SAR Holder’s employment by the Company for Cause, (A) the SAR, to the extent then exercisable, may be exercised for 90 days following termination of employment (but not beyond the

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SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

6.In the event of a termination of the SAR Holder’s employment for Cause, the SAR shall immediately cease to be exercisable and shall be immediately forfeited.

7.For purposes of this SAR, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

8.“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned

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subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(k)     Obligations as to Capital. The Company agrees that it will at all times maintain authorized and unissued share capital sufficient to fulfill all of its obligations under the SAR.

(l)     Transfer of Shares. The SAR, the Shares issued hereunder, or any interest in either, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws and the terms and conditions hereof.

(m)    Expenses of Issuance of Shares. The issuance of stock certificates upon the exercise of the SAR in whole or in part, shall be without charge to the SAR Holder. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) by reason of the exercise of the SAR in whole or in part or the resulting issuance of Shares hereunder.

(n)    Withholding. No later than the date of exercise of the SAR granted hereunder, the SAR Holder shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld upon the exercise of such SAR and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the SAR Holder, federal, state and local taxes of any kind required by law to be withheld upon the exercise of such SAR.

(o)    References. References herein to rights and obligations of the SAR Holder shall apply, where appropriate, to the SAR Holder’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this SAR.

(p)    Notices. Any notice required or permitted to be given under this agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

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If to the Company:

Arch Capital Group Ltd.:

Wessex House
45 Reid StreetHamilton HM 12 Bermuda
Attn: Secretary

If to the SAR Holder:

The last address delivered to the Company by the SAR Holder in the manner set forth herein.

(q)    Governing Law. This agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws thereof.

(r)    Entire Agreement. This agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this agreement and the Plan.

(s)    Counterparts. This agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this agreement as of the Date of Grant.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson

Title: Secretary

/s/ Mark D. Lyons    
Mark D. Lyons

7

EX-10.7

Exhibit 10.7

ARCH CAPITAL GROUP LTD.Share Appreciation Right Agreement

AGREEMENT, made and entered into this 6th day of September, 2012, by and between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and Mark D. Lyons (the “SAR Holder”).

WHEREAS, the SAR Holder has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the Company and the SAR Holder agree as follows:

(a)Grant. Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Company hereby grants to the SAR Holder a Share Appreciation Right (the “SAR”) with respect to 15,000 Shares. The SAR represents a right to be paid, upon exercise of the SAR, an amount measured by (x) the difference between the Fair Market Value per Share on the date of exercise and the exercise price per Share of the SAR, multiplied by (y) the number of Shares with respect to which the SAR is exercised, with such amount to be paid in the form of Shares valued at their Fair Market Value on the date of exercise. The SAR is granted as of September 6, 2012 (the “Date of Grant”), and such grant is subject to the terms and conditions herein and the terms and conditions of the Plan. In the event there is any conflict between the terms of the Plan and this Agreement, the terms of the Plan shall control. Capitalized terms used herein but not defined shall have the meanings given to them in the Plan.

(b)Exercise Price. The exercise price of the SAR shall be equal to $40.10 per Share.

(c)Status of Shares. Upon issue, the shares received upon exercise of the SAR shall rank equally in all respects with the other Shares.

(d)Term of SAR. The SAR may be exercised only during the period (the “SAR Period”) set forth in paragraph (f) below and shall remain exercisable until the tenth anniversary of the Date of Grant. Thereafter, the SAR Holder shall cease to have any rights in respect thereof. The right to exercise the SAR shall be subject to sooner termination as provided in paragraph (j) below.

(e)No Rights of Shareholder. The SAR Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or in equity.

(f)Exercisability. Except as otherwise set forth in paragraph (j) below, the SAR shall become exercisablein three equal annual installments on the first, second and third anniversaries of the Date of Grant, in each case subject to paragraph (j) below. Subject to paragraph (j) below, the SAR may be exercised at any time or from time to time during the SAR Period in regard to all or any portion of the SAR which is then exercisable, as may be adjusted pursuant to paragraph (g) below.

(g)Anti-dilution Adjustment. For the avoidance of doubt, the terms of Section 4(c) of the Plan, relating to anti-dilution adjustments, will apply to the SAR.

(h)Nontransferability. The SAR, or any interest therein, may not be assigned or otherwise transferred, disposed of or encumbered by the SAR Holder, other than by will or by the laws of descent and distribution. During the lifetime of the SAR Holder, the SAR shall be exercisable only by the SAR Holder or by his or her guardian or legal representative. Notwithstanding the foregoing, the SAR may be transferred by the SAR Holder to members of his or her “immediate family” or to a trust or other entity established for the exclusive benefit of solely one or more members of the SAR Holder’s “immediate family.” Any SAR held by the transferee will continue to be subject to the same terms and conditions that were applicable to the SAR immediately prior to the transfer, except that the SAR will be transferable by the transferee only by will or the laws of descent and distribution. For purposes hereof, “immediate family” means the SAR Holder’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouse, siblings (including half brother and sisters), in laws, and relationships arising because of legal adoption.

(i)Exercise of SAR. In order to exercise the SAR, the SAR Holder shall submit to the Company an instrument specifying the whole number of Shares in respect of which the SAR is being exercised. Shares will be issued accordingly by the Company within 30 days. The payment upon a SAR exercise shall be solely the number of whole Shares calculated in paragraph (a) above. Fractional Shares shall be rounded down to the nearest whole Share with no cash consideration being paid upon exercise. Anything to the contrary herein notwithstanding, the Company shall not be obligated to issue any Shares hereunder if the issuance of such Shares would violate the provision of any applicable law, in which event the Company shall, as soon as practicable, take whatever action it reasonably can so that such Shares may be issued without resulting in such violations of law.

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(j)Termination of Service.

1.In the event the SAR Holder ceases to be an employee of the Company due to his death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder (or his Beneficiary or estate in the event of his death) for a period of three years following such termination of employment (but not beyond the SAR Period).

2.In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the SAR shall continue to become exercisable on the schedule set forth in paragraph (f) above so long as the SAR Holder does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”) and shall continue to be exercisable by the SAR Holder (or his Beneficiary or estate in the event of his death) for the remainder of the SAR Period. In the event the SAR Holder engages in a Competitive Activity, (A) the SAR, to the extent then exercisable, may be exercised for 30 days following the date on which the SAR Holder engages in such Competitive Activity (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited.

3.In the event the SAR Holder ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the SAR Holder for Good Reason (as defined in the Employment Agreement, dated as of July 25, 2012, between the SAR Holder and the Company), in either case, on or before the second anniversary of the occurrence of the Change in Control, the SAR, to the extent not already exercisable in full, shall become immediately exercisable in full and shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period).

4.In the event that the SAR Holder ceases to be an employee of the Company for any other reason, except due to a termination of the SAR Holder’s employment by the Company for Cause, (A) the SAR, to the extent then exercisable, may be exercised for 90 days following termination of employment (but not beyond the SAR Period) and (B) the SAR, to the extent then not exercisable, shall be immediately forfeited; provided that, in the event of a Redundancy (as defined below), the Committee, in its sole discretion, may, in accordance with its authority under the Plan, determine that the SAR, to the extent not exercisable, shall become exercisable and

3

shall continue to be exercisable by the SAR Holder for a period of 90 days following such termination of employment (but not beyond the SAR Period).

5.In the event of a termination of the SAR Holder’s employment for Cause, the SAR shall immediately cease to be exercisable and shall be immediately forfeited.

6.For purposes of this SAR, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

7.“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned

4

subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

8. “Redundancy” shall mean termination of employment by the Company due to its need to reduce the size of its workforce, including due to closure of a business or a particular workplace or change in business process.  Whether a termination of employment is due to a "redundancy" shall be determined by the Committee in its sole and absolute discretion, such determination being final and binding on all parties hereto and all persons claiming through, in the name of or on behalf of such parties.  

(k)     Obligations as to Capital. The Company agrees that it will at all times maintain authorized and unissued share capital sufficient to fulfill all of its obligations under the SAR.

(l)     Transfer of Shares. The SAR, the Shares issued hereunder, or any interest in either, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws and the terms and conditions hereof.

(m)    Expenses of Issuance of Shares. The issuance of stock certificates upon the exercise of the SAR in whole or in part, shall be without charge to the SAR Holder. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) by reason of the exercise of the SAR in whole or in part or the resulting issuance of Shares hereunder.

(n)    Withholding. No later than the date of exercise of the SAR granted hereunder, the SAR Holder shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld upon the exercise of such SAR and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the SAR Holder, federal, state and local taxes of any kind required by law to be withheld upon the exercise of such SAR.

(o)    References. References herein to rights and obligations of the SAR Holder shall apply, where appropriate, to the SAR Holder’s legal representative or estate

5

without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this SAR.

(p)    Notices. Any notice required or permitted to be given under this agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

If to the Company:

Arch Capital Group Ltd.:

Wessex House
45 Reid StreetHamilton HM 12 Bermuda
Attn: Secretary

If to the SAR Holder:

The last address delivered to the Company by the SAR Holder in the manner set forth herein.

(q)    Governing Law. This agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws thereof.

(r)    Entire Agreement. This agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this agreement and the Plan.

(s)    Counterparts. This agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this agreement as of the Date of Grant.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson
Title: Secretary

/s/ Mark D. Lyons     Mark D. Lyons

7

EX-10.8

Exhibit 10.8

ARCH CAPITAL GROUP LTD.
Restricted Share Agreement

THIS AGREEMENT, dated as of September 6, 2012, between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and Mark D. Lyons (the “Employee”).

WHEREAS, the Employee has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows.

1.Award of Shares.  Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Employee is hereby awarded 60,000 Restricted Shares (the “Award”), subject to the terms and conditions herein set forth. Capitalized terms used herein and not defined shall have the meanings set forth in the Plan. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

2.Terms and Conditions.  It is understood and agreed that the Award of Restricted Shares evidenced hereby is subject to the following terms and conditions:

(a)Vesting of Award. Subject to Section 2(b) below and the other terms and conditions of this Agreement, this Award shall become vested in one installment on the fifth anniversary of the date hereof. Unless otherwise provided by the Company, all dividends and other amounts receivable in connection with any adjustments to the Shares under Section 4(c) of the Plan shall be subject to the vesting schedule in this Section 2(a).

(b)Termination of Service; Forfeiture of Unvested Shares.

(i)In the event the Employee ceases to be an employee of the Company prior to the date the Restricted Shares otherwise become vested due to his or her death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Shares shall become immediately vested in full upon such termination of employment.

(ii)In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, and other than as set forth in Section 2 (b) (i), (iii) or (iv) hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Shares shall continue to vest on the schedule set forth in Section 2(a) above so long as the Employee does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of

1

another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”). In the event the Employee engages in a Competitive Activity, any unvested Restricted Shares shall be forfeited by the Employee and become the property of the Company.

(iii)In the event the Employee ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement, dated as of July 25, 2012, between the Employee and the Company (the “Employment Agreement”)), in either case, on or before the second anniversary of the occurrence of the Change in Control, the Restricted Shares, to the extent not already vested, shall become immediately vested in full upon such termination of employment.

(iv)In the event the Employee ceases to be an employee of the Company, other than as set forth in Section 2(b)(iii) above, due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement), a pro rata number of the Restricted Shares subject to the Award, if not already vested, shall become vested upon such termination of service determined by multiplying the total number of Restricted Shares subject to the Award by a fraction, the numerator of which is the number of full years elapsed since the date hereof through the Employee’s termination date and the denominator of which is five. Any of the Restricted Shares subject to the Award that are not vested, and do not become vested, at the time of termination shall be immediately forfeited.

(v)If the Employee ceases to be an Employee of the Company for any other reason prior to the date the Restricted Shares become vested, the Award shall be forfeited by the Employee and become the property of the Company.

(vi)For purposes of this Agreement, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

(vii)“Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date

2

and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets, or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(c)Certificates.  Each certificate issued in respect of Restricted Shares awarded hereunder shall be issued in book entry format with the Company’s transfer agent and shall bear a legend disclosing the restrictions on transferability imposed on such Restricted Shares by this Agreement (the “Restrictive Legend”). Upon the vesting of Restricted Shares pursuant to Section 2 hereof and the satisfaction of any withholding tax liability pursuant to

3

Section 5 hereof, such vested Shares, not bearing the Restrictive Legend, shall be delivered to the Employee.

(d)    Rights of a Stockholder.  Prior to the time a Restricted Share is fully vested hereunder, the Employee shall have no right to transfer, pledge, hypothecate or otherwise encumber such Restricted Share. During such period, the Employee shall have all other rights of a stockholder, including, but not limited to, the right to vote and to receive dividends (subject to Section 2(a) hereof) at the time paid on such Restricted Shares.

(e)    No Right to Continued Employment. This Award shall not confer upon the Employee any right with respect to continuance of employment by the Company nor shall this Award interfere with the right of the Company to terminate the Employee’s employment at any time.

3.Transfer of Shares. The Shares delivered hereunder, or any interest therein, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws or any other applicable laws or regulations and the terms and conditions hereof.

4.Expenses of Issuance of Shares. The issuance of stock certificates hereunder shall be without charge to the Employee. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) or by reason of the issuance of Shares.

5.Withholding. No later than the date of vesting of (or the date of an election by the Employee under Section 83(b) of the Code with respect to) the Award granted hereunder, the Employee shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld at such time with respect to such Award and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the Employee, federal, state and local taxes of any kind required by law to be withheld at such time.

6.References.  References herein to rights and obligations of the Employee shall apply, where appropriate, to the Employee’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this Agreement.

7.Notices.  Any notice required or permitted to be given under this Agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

4

If to the Company:

Arch Capital Group Ltd.Wessex House
45 Reid Street
Hamilton HM 12 Bermuda Attn.: Secretary

If to the Employee:

To the last address delivered to the Company by the
Employee in the manner set forth herein.

8.Governing Law.  This Agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws.

9.Entire Agreement. This Agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this Agreement and the Plan.

10.Counterparts.  This Agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above written.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson

Title: Secretary

/s/ Mark D. Lyons    Mark D. Lyons

6

EX-10.9

Exhibit 10.9

ARCH CAPITAL GROUP LTD.
Restricted Share Agreement

THIS AGREEMENT, dated as of September 6, 2012, between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and Mark D. Lyons (the “Employee”).

WHEREAS, the Employee has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, the parties hereto agree as follows.

1.Award of Shares.  Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Employee is hereby awarded 15,000 Restricted Shares (the “Award”), subject to the terms and conditions herein set forth. Capitalized terms used herein and not defined shall have the meanings set forth in the Plan. In the event of any conflict between this Agreement and the Plan, the Plan shall control.

2.Terms and Conditions.  It is understood and agreed that the Award of Restricted Shares evidenced hereby is subject to the following terms and conditions:

(a)    Vesting of Award. Subject to Section 2(b) below and the other terms and conditions of this Agreement, this Award shall become vested in three equal annual installments on the first, second and third anniversaries of the date hereof. Unless otherwise provided by the Company, all dividends and other amounts receivable in connection with any adjustments to the Shares under Section 4(c) of the Plan shall be subject to the vesting schedule in this Section 2(a).

(b)    Termination of Service; Forfeiture of Unvested Shares.

(i)    In the event the Employee ceases to be an employee of the Company prior to the date the Restricted Shares otherwise become vested due to his or her death or Permanent Disability (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Shares shall become immediately vested in full upon such termination of employment.

(ii)    In the event of termination of employment (other than by the Company for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof) after the attainment of Retirement Age (as defined in the Company’s Incentive Compensation Plan on the date hereof), the Restricted Shares shall continue to vest on the schedule set forth in Section 2(a) above so long as the Employee does not engage in any activity in competition with any activity of the Company or any of its Subsidiaries other than serving on the board of directors (or similar governing body) of another company or as a consultant for no more than 26 weeks per calendar year (“Competitive Activity”). In the event the Employee

1

engages in a Competitive Activity, any unvested Restricted Shares shall be forfeited by the Employee and become the property of the Company.

(iii)    In the event the Employee ceases to be an employee of the Company after a Change in Control (as defined below) due to termination (A) by the Company not for Cause or (B) by the Employee for Good Reason (as defined in the Employment Agreement, dated as of July 25, 2012, between the Employee and the Company), in either case, on or before the second anniversary of the occurrence of the Change in Control, the Restricted Shares, to the extent not already vested, shall become immediately vested in full upon such termination of employment.

(iv)    If the Employee ceases to be an Employee of the Company for any other reason prior to the date the Restricted Shares become vested, the Award shall be forfeited by the Employee and become the property of the Company; provided that, in the event of a Redundancy (as defined below), the Committee, in its sole discretion, may, in accordance with its authority under the Plan, determine that the Restricted Shares, to the extent not vested, shall become vested upon such termination of employment.

(v)    For purposes of this Agreement, service with any of the Company’s Subsidiaries (as defined in the Plan) shall be considered to be service with the Company.

(vii)    “Change in Control” shall mean:

(A) any person (within the meaning of the Securities Exchange Act of 1934, as amended (the “Exchange Act”), other than a Permitted Person, is or becomes the “beneficial owner” (as defined in Rule 13d-3 under the Exchange Act), directly or indirectly, of Voting Securities representing 50% or more of the total voting power or value of all the then outstanding Voting Securities; or

(B) the individuals who, as of the date hereof, constitute the Board of Directors of the Company (the “Board”) together with those who become directors subsequent to such date and whose recommendation, election or nomination for election to the Board was approved by a vote of at least a majority of the directors then still in office who either were directors as of such date or whose recommendation, election or nomination for election was previously so approved, cease for any reason to constitute a majority of the members of the Board; or

(C) the consummation of a merger, consolidation, recapitalization, liquidation, sale or disposition by the Company of all or substantially all of the Company's assets,

2

or reorganization of the Company, other than any such transaction which would (x) result in more than 50% of the total voting power and value represented by the voting securities of the surviving entity outstanding immediately after such transaction being beneficially owned by the former shareholders of the Company and (y) not otherwise be deemed a Change in Control under subparagraphs (A) or (B) of this paragraph.

“Permitted Persons” means (A) the Company; (B) any Related Party; or (C) any group (as defined in Rule 13b-3 under the Exchange Act) comprised of any or all of the foregoing.

“Related Party” means (A) a majority-owned subsidiary of the Company; (B) a trustee or other fiduciary holding securities under an employee benefit plan of the Company or any majority-owned subsidiary of the Company; or (C) any entity, 50% or more of the voting power of which is owned directly or indirectly by the shareholders of the Company in substantially the same proportion as their ownership of Voting Securities immediately prior to the transaction.

“Voting Security” means any security of the Company which carries the right to vote generally in the election of directors.

(vii)    “Redundancy” shall mean termination of employment by the Company due to its need to reduce the size of its workforce, including due to closure of a business or a particular workplace or change in business process.  Whether a termination of employment is due to a "redundancy" shall be determined by the Committee in its sole and absolute discretion, such determination being final and binding on all parties hereto and all persons claiming through, in the name of or on behalf of such parties.  

(c)    Certificates.  Each certificate issued in respect of Restricted Shares awarded hereunder shall be issued in book entry format with the Company’s transfer agent and shall bear a legend disclosing the restrictions on transferability imposed on such Restricted Shares by this Agreement (the “Restrictive Legend”). Upon the vesting of Restricted Shares pursuant to Section 2 hereof and the satisfaction of any withholding tax liability pursuant to Section 5 hereof, such vested Shares, not bearing the Restrictive Legend, shall be delivered to the Employee.

(d)    Rights of a Stockholder.  Prior to the time a Restricted Share is fully vested hereunder, the Employee shall have no right to transfer, pledge, hypothecate or otherwise

3

encumber such Restricted Share. During such period, the Employee shall have all other rights of a stockholder, including, but not limited to, the right to vote and to receive dividends (subject to Section 2(a) hereof) at the time paid on such Restricted Shares.

(e)    No Right to Continued Employment. This Award shall not confer upon the Employee any right with respect to continuance of employment by the Company nor shall this Award interfere with the right of the Company to terminate the Employee’s employment at any time.

3.    Transfer of Shares. The Shares delivered hereunder, or any interest therein, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws or any other applicable laws or regulations and the terms and conditions hereof.

4.    Expenses of Issuance of Shares. The issuance of stock certificates hereunder shall be without charge to the Employee. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) or by reason of the issuance of Shares.

5.    Withholding. No later than the date of vesting of (or the date of an election by the Employee under Section 83(b) of the Code with respect to) the Award granted hereunder, the Employee shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld at such time with respect to such Award and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the Employee, federal, state and local taxes of any kind required by law to be withheld at such time.

6.    References.  References herein to rights and obligations of the Employee shall apply, where appropriate, to the Employee’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this Agreement.

7.    Notices.  Any notice required or permitted to be given under this Agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

If to the Company:

Arch Capital Group Ltd.Wessex House, 4th Floor
45 Reid Street

4

Hamilton HM 12 Bermuda Attn.: Secretary

If to the Employee:

To the last address delivered to the Company by the
Employee in the manner set forth herein.

8.    Governing Law.  This Agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws.

9.    Entire Agreement. This Agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this Agreement and the Plan.

10.    Counterparts.  This Agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

5

IN WITNESS WHEREOF, the undersigned have executed this Agreement as of the date first above written.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson    

Name: Dawna Ferguson

Title: Secretary

/s/ Mark D. Lyons    
Mark D. Lyons

6

EX-10.10

Exhibit 10.10

ARCH CAPITAL GROUP LTD.Share Appreciation Right Agreement

AGREEMENT, made and entered into this 28th day of February, 2013, by and between Arch Capital Group Ltd. (the “Company”), a Bermuda company, and Constantine Iordanou (the “SAR Holder”).

WHEREAS, the SAR Holder has been granted the following award under the Company’s 2012 Long Term Incentive and Share Award Plan (the “Plan”);

NOW, THEREFORE, in consideration of the premises and mutual covenants contained herein, and for other good and valuable consideration, the Company and the SAR Holder agree as follows:

(a)Grant. Pursuant to the provisions of the Plan, the terms of which are incorporated herein by reference, the Company hereby grants to the SAR Holder a Share Appreciation Right (the “SAR”) with respect to 300,187 Shares. The SAR represents a right to be paid, upon exercise of the SAR, an amount measured by (x) the difference between the Fair Market Value per Share on the date of exercise and the exercise price per Share of the SAR, multiplied by (y) the number of Shares with respect to which the SAR is exercised, with such amount to be paid in the form of Shares valued at their Fair Market Value on the date of exercise. The SAR is granted as of February 28, 2013 (the “Date of Grant”), and such grant is subject to the terms and conditions herein and the terms and conditions of the Plan. In the event there is any conflict between the terms of the Plan and this Agreement, the terms of the Plan shall control. Capitalized terms used herein but not defined shall have the meanings given to them in the Plan.

(b)Exercise Price. The exercise price of the SAR shall be equal to $49.12 per Share.

(c)Status of Shares. Upon issue, the shares received upon exercise of the SAR shall rank equally in all respects with the other Shares.

(d)Term of SAR. The SAR may be exercised only during the period (the “SAR Period”) set forth in paragraph (f) below and shall remain exercisable until the tenth anniversary of the Date of Grant. Thereafter, the SAR Holder shall cease to have any rights in respect thereof. The right to exercise the SAR shall be subject to sooner termination as provided in paragraph (j) below.

(e)No Rights of Shareholder. The SAR Holder shall not, by virtue hereof, be entitled to any rights of a shareholder in the Company, either at law or in equity.

(f)Exercisability. The SAR shall be fully exercisableon the Date of Grant. The SAR may be exercised at any time or from time to time during the SAR Period in regard to all of the SAR, as may be adjusted pursuant to paragraph (g) below.

(g)Adjustments for Recapitalization and Dividends. In the event that, prior to the expiration of the SAR, any dividend in Shares, recapitalization, Share split, reverse split, reorganization, merger, consolidation, spin-off, combination, repurchase, or share exchange, or other such change affects the Shares such that they are increased or decreased or changed into or exchanged for a different number or kind of shares, other securities of the Company or of another corporation or other consideration, then in order to maintain the proportionate interest of the SAR Holder and preserve the value of the SAR, (i) there shall automatically be substituted for each Share subject to the unexercised SAR the number and kind of shares, other securities or other consideration (including cash) into which each outstanding Share shall be changed or for which each such Share shall be exchanged, and (ii) the exercise price shall be increased or decreased proportionately so that the aggregate purchase price for the Shares subject to the unexercised SAR shall remain the same as immediately prior to such event.

(h)Nontransferability. The SAR, or any interest therein, may not be assigned or otherwise transferred, disposed of or encumbered by the SAR Holder, other than by will or by the laws of descent and distribution. During the lifetime of the SAR Holder, the SAR shall be exercisable only by the SAR Holder or by his or her guardian or legal representative. Notwithstanding the foregoing, the SAR may be transferred by the SAR Holder to members of his or her “immediate family” or to a trust or other entity established for the exclusive benefit of solely one or more members of the SAR Holder’s “immediate family.” Any SAR held by the transferee will continue to be subject to the same terms and conditions that were applicable to the SAR immediately prior to the transfer, except that the SAR will be transferable by the transferee only by will or the laws of descent and distribution. For purposes hereof, “immediate family” means the SAR Holder’s children, stepchildren, grandchildren, parents, stepparents, grandparents, spouse, siblings (including half brother and sisters), in laws, and relationships arising because of legal adoption.

(i)Exercise of SAR. In order to exercise the SAR, the SAR Holder shall submit to the Company an instrument specifying the whole number of Shares in respect of which the SAR is being exercised. Shares will be issued accordingly by the Company, and a share certificate dispatched to the SAR Holder within 30 days. The payment upon a SAR exercise shall be solely the number of whole Shares calculated in paragraph (a) above. Fractional Shares shall be rounded down to the nearest whole Share with no cash consideration being paid upon exercise. Anything to the contrary herein notwithstanding, the Company shall not be obligated to issue any Shares hereunder if the issuance of such Shares would violate the provision of any applicable law, in which event the Company shall, as soon as practicable, take whatever action it reasonably can so that such Shares may be issued without resulting in such violations of law.

2

(j)Termination of Service. In the event of a termination of the SAR Holder’s employment for Cause, as such term is defined in the Company’s Incentive Compensation Plan on the date hereof, the SAR shall immediately cease to be exercisable and shall be immediately forfeited.

(k)     Obligations as to Capital. The Company agrees that it will at all times maintain authorized and unissued share capital sufficient to fulfill all of its obligations under the SAR.

(l)     Transfer of Shares. The SAR, the Shares issued hereunder, or any interest in either, may be sold, assigned, pledged, hypothecated, encumbered, or transferred or disposed of in any other manner, in whole or in part, only in compliance with the terms, conditions and restrictions as set forth in the governing instruments of the Company, applicable United States federal and state securities laws and the terms and conditions hereof.

(m)    Expenses of Issuance of Shares. The issuance of stock certificates upon the exercise of the SAR in whole or in part, shall be without charge to the SAR Holder. The Company shall pay any issuance, stamp or documentary taxes (other than transfer taxes) or charges imposed by any governmental body, agency or official (other than income taxes) by reason of the exercise of the SAR in whole or in part or the resulting issuance of Shares hereunder.

(n)    Withholding. No later than the date of exercise of the SAR granted hereunder, the SAR Holder shall pay to the Company or make arrangements satisfactory to the Committee regarding payment of any federal, state or local taxes of any kind required by law to be withheld upon the exercise of such SAR and the Company shall, to the extent permitted or required by law, have the right to deduct from any payment of any kind otherwise due to the SAR Holder, federal, state and local taxes of any kind required by law to be withheld upon the exercise of such SAR.

(o)    References. References herein to rights and obligations of the SAR Holder shall apply, where appropriate, to the SAR Holder’s legal representative or estate without regard to whether specific reference to such legal representative or estate is contained in a particular provision of this SAR.

(p)    Notices. Any notice required or permitted to be given under this agreement shall be in writing and shall be deemed to have been given when delivered personally or by courier, or sent by certified or registered mail, postage prepaid, return receipt requested, duly addressed to the party concerned at the address indicated below or to such changed address as such party may subsequently by similar process give notice of:

3

If to the Company:

Arch Capital Group Ltd.:

Wessex House
45 Reid StreetHamilton HM 12 Bermuda
Attn: Secretary

If to the SAR Holder:

The last address delivered to the Company by the SAR Holder in the manner set forth herein.

(q)    Governing Law. This agreement shall be governed by and construed in accordance with the laws of New York, without giving effect to principles of conflict of laws thereof.

(r)    Entire Agreement. This agreement and the Plan constitute the entire agreement among the parties relating to the subject matter hereof, and any previous agreement or understanding among the parties with respect thereto is superseded by this agreement and the Plan.

(s)    Counterparts. This agreement may be executed in two counterparts, each of which shall constitute one and the same instrument.

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IN WITNESS WHEREOF, the undersigned have executed this agreement as of the Date of Grant.

ARCH CAPITAL GROUP LTD.

By: /s/ Dawna Ferguson        

Name: Dawna Ferguson

Title: Secretary

/s/ Constantine Iordanou        Constantine Iordanou

5

EX-15

Exhibit 15

August 9, 2013

Securities and Exchange Commission

100 F Street, N.E.

Washington, DC 20549

Commissioners:

We are aware that our report dated August 9, 2013 on our review of interim financial information of Arch Capital Group Ltd. and its subsidiaries (the “Company”) for the three-month and six-month periods ended June 30, 2013 and June 30, 2012 and included in the Company's quarterly report on Form 10-Q for the quarter ended June 30, 2013 is incorporated by reference in the Registration Statement on Form S-3 (Registration No. 333-180329) and in the Registration Statement on Form S-8 (Registration No. 333-181308).

Very truly yours,

/s/ PricewaterhouseCoopers LLP

PricewaterhouseCoopers LLP, 300 Madison Avenue, New York, NY 10017

T: (646) 471 3000, F: (646) 471 8320, www.pwc.com/us

EX-31.1

Exhibit 31.1

Certification

of Chief Executive Officer

Pursuant to Section 302 of the

Sarbanes-Oxley Act of 2002

I, Constantine Iordanou, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Arch Capital Group Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in the report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and to the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 9, 2013
By:	/s/ Constantine Iordanou
Name:	Constantine Iordanou
Title:	President and Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification

of Chief Financial Officer

Pursuant to Section 302 of the

Sarbanes-Oxley Act of 2002

I, Mark D. Lyons, certify that:

1. I have reviewed this quarterly report on Form 10-Q of Arch Capital Group Ltd.;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in the report;

4. The registrant’s other certifying officer and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and to the audit committee of registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	August 9, 2013
By:	/s/ Mark D. Lyons
Name:	Mark D. Lyons
Title:	Executive Vice President, Chief Financial Officer and Treasurer

EX-32.1

Exhibit 32.1

Certification Pursuant to Chapter 63, Title 18 United States Code §1350

As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Arch Capital Group Ltd. (the “Company”) on Form 10-Q for the period ending June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Constantine Iordanou, as President and Chief Executive Officer of the Company, certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934; and

(2) the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 9, 2013

/s/ Constantine Iordanou

Constantine Iordanou

President and Chief Executive Officer

A signed original of this written statement required by Section 906 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Arch Capital Group Ltd. and will be retained by Arch Capital Group Ltd. and furnished to the Securities and Exchange Commission or its staff upon request.

EX-32.2

Exhibit 32.2

Certification Pursuant to Chapter 63, Title 18 United States Code §1350

As Adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of Arch Capital Group Ltd. (the “Company”) on Form 10-Q for the period ending June 30, 2013 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), Mark D. Lyons, as Executive Vice President, Chief Financial Officer and Treasurer of the Company, certifies pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) the Report fully complies with the requirements of section 13(a) of the Securities Exchange Act of 1934; and

(2) the information contained in such report fairly presents, in all material respects, the financial condition and results of operations of the Company.

Date: August 9, 2013

/s/ Mark D. Lyons

Mark D. Lyons

Executive Vice President,

Chief Financial Officer and Treasurer

A signed original of this written statement required by Section 906 or other document authenticating, acknowledging or otherwise adopting the signature that appears in typed form within the electronic version of this written statement required by Section 906, has been provided to Arch Capital Group Ltd. and will be retained by Arch Capital Group Ltd. and furnished to the Securities and Exchange Commission or its staff upon request.

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Income Taxes

6 Months Ended

Jun. 30, 2013

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

ACGL is incorporated under the laws of Bermuda and, under current Bermuda law, is not obligated to pay any taxes in Bermuda based upon income or capital gains. The Company has received a written undertaking from the Minister of Finance in Bermuda under the Exempted Undertakings Tax Protection Act 1966 that, in the event that any legislation is enacted in Bermuda imposing any tax computed on profits, income, gain or appreciation on any capital asset, or any tax in the nature of estate duty or inheritance tax, such tax will not be applicable to ACGL or any of its operations until March 31, 2035. This undertaking does not, however, prevent the imposition of taxes on any person ordinarily resident in Bermuda or any company in respect of its ownership of real property or leasehold interests in Bermuda.

ACGL and its non-U.S. subsidiaries will be subject to U.S. federal income tax only to the extent that they derive U.S. source income that is subject to U.S. withholding tax or income that is effectively connected with the conduct of a trade or business within the U.S. and is not exempt from U.S. tax under an applicable income tax treaty with the U.S. ACGL and its non-U.S. subsidiaries will be subject to a withholding tax on dividends from U.S. investments and interest from certain U.S. payors (subject to reduction by any applicable income tax treaty). ACGL and its non-U.S. subsidiaries intend to conduct their operations in a manner that will not cause them to be treated as engaged in a trade or business in the United States and, therefore, will not be required to pay U.S. federal income taxes (other than U.S. excise taxes on insurance and reinsurance premium and withholding taxes on dividends and certain other U.S. source investment income). However, because there is uncertainty as to the activities which constitute being engaged in a trade or business within the United States, there can be no assurances that the U.S. Internal Revenue Service will not contend successfully that ACGL or its non-U.S. subsidiaries are engaged in a trade or business in the United States. If ACGL or any of its non-U.S. subsidiaries were subject to U.S. income tax, ACGL’s shareholders’ equity and earnings could be materially adversely affected. ACGL has subsidiaries and branches that operate in various jurisdictions around the world that are subject to tax in the jurisdictions in which they operate. The significant jurisdictions in which ACGL’s subsidiaries and branches are subject to tax are the United States, United Kingdom, Ireland, Canada, Switzerland and Denmark.

The Company’s income tax provision on income before income taxes resulted in an expense of 2.2% for the six months ended June 30, 2013, compared to an expense of 0.7% for the 2012 period. The Company’s effective tax rate, which is based upon the expected annual effective tax rate, may fluctuate from period to period based on the relative mix of income or loss reported by jurisdiction and the varying tax rates in each jurisdiction. The Company had a net deferred tax asset of $140.7 million at June 30, 2013, compared to $98.6 million at December 31, 2012. In addition, the Company paid$4.8 million in income taxes for the six months ended June 30, 2013, while the Company paid$4.3 million for the 2012 period.

The United States also imposes an excise tax on insurance and reinsurance premiums paid to non-U.S. insurers or reinsurers with respect to risks located in the United States. The Company incurs federal excise taxes on certain of its reinsurance transactions, including amounts ceded through intercompany transactions. The Company incurred $4.3 million of federal excise taxes for the six months ended June 30, 2013, compared to $4.0 million for the 2012 period. Such amounts are reflected as acquisition expenses in the Company’s consolidated statements of income.

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Unaudited Consolidated Statements of Income (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Revenues
Net premiums written	$ 810,535	$ 820,233	$ 1,763,311	$ 1,683,844
Change in unearned premiums	(51,719)	(93,577)	(251,725)	(276,876)
Net premiums earned	758,816	726,656	1,511,586	1,406,968
Net investment income	68,369	73,608	134,041	147,905
Net realized gains	12,652	34,867	70,992	78,988
Other-than-temporary impairment losses	(724)	(2,454)	(2,972)	(3,485)
Less investment impairments recognized in other comprehensive income, before taxes	0	503	2	511
Net impairment losses recognized in earnings	(724)	(1,951)	(2,970)	(2,974)
Fee income	902	806	1,440	1,349
Equity in net income of investment funds accounted for using the equity method	10,941	7,787	24,764	32,613
Other income (loss)	834	695	2,078	(7,373)
Total revenues	851,790	842,468	1,741,931	1,657,476
Expenses
Losses and loss adjustment expenses	418,653	399,693	818,056	794,900
Acquisition expenses	131,677	128,289	259,269	247,251
Other operating expenses	127,408	117,701	247,591	224,173
Interest expense	5,852	7,439	11,750	14,960
Net foreign exchange gains	(13,811)	(31,689)	(38,075)	(11,001)
Total expenses	669,779	621,433	1,298,591	1,270,283
Income before income taxes	182,011	221,035	443,340	387,193
Income tax expense	5,071	767	9,924	2,669
Net income	176,940	220,268	433,416	384,524
Preferred dividends	5,485	7,649	10,969	14,110
Loss on repurchase of preferred shares	0	10,612	0	10,612
Net income available to common shareholders	$ 171,455	$ 202,007	$ 422,447	$ 359,802
Net income per common share
Basic (per share)	$ 1.31	$ 1.50	$ 3.22	$ 2.68
Diluted (per share)	$ 1.26	$ 1.46	$ 3.11	$ 2.61
Weighted average common shares and common share equivalents outstanding
Basic (shares)	131,377,274	134,529,129	131,143,885	134,241,876
Diluted (shares)	135,849,050	138,211,736	135,624,226	138,017,490

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Recent Accounting Pronouncements

6 Months Ended

Jun. 30, 2013

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

Effective January 1, 2013, the Company adopted Financial Accounting Standards Board ("FASB") guidance requiring additional disclosures about reclassification adjustments from accumulated other comprehensive income. As this guidance is disclosure-related only, the adoption of this guidance did not impact the Company’s results of operations, financial condition or liquidity. The additional disclosures are provided in Note 11, "Other Comprehensive Income."

Effective January 1, 2013, the Company adopted FASB guidance requiring additional disclosures about financial instruments and derivative instruments that are either: (1) offset for balance sheet presentation purposes or (2) subject to an enforceable master netting arrangement or similar arrangement, regardless of whether they are offset for balance sheet presentation purposes. The disclosure requirements of this guidance are limited to derivatives, repurchase agreements and reverse repurchase agreements, and securities borrowing/lending transactions. As this guidance is disclosure-related only and did not amend existing balance sheet offsetting guidance, adoption did not impact the Company’s results of operations, financial condition or liquidity. The additional disclosures are provided in Note 7, "Investment Information," and Note 9, "Derivative Instruments."

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Fair Value (Tables)

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair value hierarchy

The following table presents the Company’s financial assets and liabilities measured at fair value by level at June 30, 2013:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	—	$	2,470,770	$	2,360
Mortgage backed securities	1,592,207		—		1,592,207		—
Municipal bonds	1,507,924		—		1,507,924		—
Commercial mortgage backed securities	838,471		—		838,471		—
U.S. government and government agencies	975,345		975,345		—		—
Non-U.S. government securities	1,002,989		—		1,002,989		—
Asset backed securities	1,225,183		—		1,225,183		—
Total	9,615,249		975,345		8,637,544		2,360
Equity securities	438,038		437,278		760		—
Other investments	569,407		—		379,514		189,893
Short-term investments	1,094,129		1,062,472		31,657		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	293,976		—		293,976		—
Non-U.S. government bonds	59,334		—		59,334		—
Other investments	712,374		—		422,185		290,189
Equity securities	—		—		—		—
Total	1,065,684		—		775,495		290,189
Total assets measured at fair value	$	12,782,507	$	2,475,095	$	9,824,970	$	482,442
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	—	$	—	$	—	$	—
Total liabilities measured at fair value	$	—	$	—	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2012:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	—	$	2,759,109	$	98,404
Mortgage backed securities	1,532,736		—		1,532,736		—
Municipal bonds	1,463,586		—		1,463,586		—
Commercial mortgage backed securities	824,165		—		824,165		—
U.S. government and government agencies	1,131,688		1,131,688		—		—
Non-U.S. government securities	998,901		—		998,901		—
Asset backed securities	1,073,999		—		1,073,999		—
Total	9,882,588		1,131,688		8,652,496		98,404
Equity securities	312,749		312,666		83		—
Other investments	549,280		—		365,078		184,202
Short-term investments	730,369		678,441		51,928		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	275,132		—		275,132		—
Non-U.S. government bonds	88,409		—		88,409		—
Other investments	527,971		—		332,621		195,350
Equity securities	25,954		25,954		—		—
Total	917,466		25,954		696,162		195,350
Total assets measured at fair value	$	12,392,452	$	2,148,749	$	9,765,747	$	477,956
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	6,924	$	6,924	$	—	$	—
Total liabilities measured at fair value	$	6,924	$	6,924	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

Rollforward of Level 3 investments

The following tables present a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs:

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale					Fair Value Option
	Corporate Bonds			Other Investments		Other Investments			Total
Three Months Ended June 30, 2013
Balance at beginning of period	$	97,298		$	185,934	$	179,370		$	462,602
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	3,187			—		(2,075		)	1,112
Included in other comprehensive income	(1,363		)	3,959		—			2,596
Purchases, issuances, sales and settlements
Purchases	—			—		118,916			118,916
Issuances	—			—		—			—
Sales	(96,655		)	—		—			(96,655		)
Settlements	(107		)	—		(6,022		)	(6,129		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	2,360		$	189,893	$	290,189		$	482,442
Three Months Ended June 30, 2012
Balance at beginning of period	$	96,655		$	6,215	$	—		$	102,870
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	(548		)	—		—			(548		)
Included in other comprehensive income	(4,032		)	171		—			(3,861		)
Purchases, issuances, sales and settlements
Purchases	—			—		—			—
Issuances	—			—		—			—
Sales	—			—		—			—
Settlements	(39		)	—		—			(39		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	92,036		$	6,386	$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale						Fair Value Option
	Corporate Bonds			Other Investments			Other Investments			Total
Six Months Ended June 30, 2013
Balance at beginning of period	$	98,404		$	184,202		$	195,350		$	477,956
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	4,679			4,762			(1,702		)	7,739
Included in other comprehensive income	(3,051		)	5,871			—			2,820
Purchases, issuances, sales and settlements
Purchases	—			5,000			160,570			165,570
Issuances	—			—			—			—
Sales	(96,655		)	—			—			(96,655		)
Settlements	(1,017		)	(9,942		)	(64,029		)	(74,988		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	2,360		$	189,893		$	290,189		$	482,442
Six Months Ended June 30, 2012
Balance at beginning of period	$	92,091		$	5,124		$	—		$	97,215
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	1,783			81			—			1,864
Included in other comprehensive income	(1,759		)	1,262			—			(497		)
Purchases, issuances, sales and settlements
Purchases	—			—			—			—
Issuances	—			—			—			—
Sales	—			—			—			—
Settlements	(79		)	(81		)	—			(160		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	92,036		$	6,386		$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

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Other Comprehensive Income (Loss)

6 Months Ended

Jun. 30, 2013

Comprehensive Income Note Disclosure [Abstract]

Other Comprehensive Income (Loss)

Other Comprehensive Income (Loss)

The following table presents the changes in each component of accumulated other comprehensive income ("AOCI"), net of tax:

	Unrealized Gains on Available-For-Sale Securities			Foreign Currency Translation Adjustments			Total
Three Months Ended June 30, 2013
Beginning balance	$	260,725		$	(31,162	)	$	229,563
Other comprehensive income before reclassifications	(259,562		)	(5,407		)	(264,969		)
Amounts reclassified from accumulated other comprehensive income	(13,916		)	—			(13,916		)
Net current period other comprehensive income (loss)	(273,478		)	(5,407		)	(278,885		)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)
Six Months Ended June 30, 2013
Beginning balance	$	289,957		$	(2,940	)	$	287,017
Other comprehensive income before reclassifications	(250,093		)	(33,629		)	(283,722		)
Amounts reclassified from accumulated other comprehensive income	(52,617		)	—			(52,617		)
Net current period other comprehensive income (loss)	(302,710		)	(33,629		)	$	(336,339	)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)

The following table presents details about amounts reclassified from accumulated other comprehensive income:

		Amounts Reclassed from AOCI
Details About AOCI Components	Consolidated Statement of Income Line Item That Includes Reclassification	Three Months Ended			Six Months Ended
		June 30, 2013			June 30, 2013
Unrealized Gains on Available-For-Sale Securities
	Net realized gains	$	14,634		$	58,999
	Net impairment losses included in earnings	(724		)	(2,970		)
	Total before tax	13,910			56,029
	Income tax benefit (expense)	6			(3,412		)
	Net of tax	$	13,916		$	52,617

The following table presents the tax effects allocated to each component of other comprehensive income (loss):

	Before Tax Amount			Tax Expense (Benefit)			Net of Tax Amount
Three Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(281,388	)	$	(21,826	)	$	(259,562	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	—			—			—
Less reclassification of net realized gains included in net income	13,910			(6		)	13,916
Foreign currency translation adjustments	(5,407		)	—			(5,407		)
Other comprehensive income (loss)	$	(300,705	)	$	(21,820	)	$	(278,885	)
Three Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	23,524		$	5,464		$	18,060
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(503		)	—			(503		)
Less reclassification of net realized gains included in net income	45,384			1,592			43,792
Foreign currency translation adjustments	(16,699		)	(1,563		)	(15,136		)
Other comprehensive income (loss)	$	(39,062	)	$	2,309		$	(41,371	)
Six Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(271,043	)	$	(20,952	)	$	(250,091	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(2		)	—			(2		)
Less reclassification of net realized gains included in net income	56,029			3,412			52,617
Foreign currency translation adjustments	(33,627		)	2			(33,629		)
Other comprehensive income (loss)	$	(360,701	)	$	(24,362	)	$	(336,339	)
Six Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	109,241		$	(3,682	)	$	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(511		)	—			(511		)
Less reclassification of net realized gains included in net income	76,143			4,840			71,303
Foreign currency translation adjustments	(2,830		)	(895		)	(1,935		)
Other comprehensive income (loss)	$	29,757		$	(9,417	)	$	39,174

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Income Taxes (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Income Tax Disclosure [Abstract]
Effective tax rate on income before income taxes (percentage)	2.20%	0.70%
Net deferred tax assets	$ 140.7		$ 98.6
Income taxes paid	4.8	4.3
Federal excise taxes incurred	$ 4.3	$ 4.0

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Investment Information (Net Investment Income) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net investment income:
Gross investment income	$ 76,292		$ 80,012		$ 150,629		$ 160,990
Investment expenses	(7,923)		(6,404)		(16,588)		(13,085)
Net investment income	68,369		73,608		134,041		147,905
Fixed Maturities
Net investment income:
Gross investment income	62,004		70,290		124,010		143,740
Term loan investments
Net investment income:
Gross investment income	6,026	[1]	3,557	[1]	10,243	[1]	5,856	[1]
Short-term investments
Net investment income:
Gross investment income	364		760		756		1,132
Equity securities
Net investment income:
Gross investment income	3,164		2,425		4,587		4,089
Other
Net investment income:
Gross investment income	$ 4,734	[2]	$ 2,980	[2]	$ 11,033	[2]	$ 6,173	[2]

[1] Included in “investments accounted for using the fair value option” on the Company’s consolidated balance sheets.

[2] Amounts include dividends on investment funds and other items.

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Share Transactions - Share Repurchases (Details) (Common Shares, USD $) Share data in Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2013
Common Shares
Class of Stock [Line Items]
Cumulative number of shares acquired since inception of share repurchase program		109.9
Aggregate purchase price of shares acquired since inception of share repurchase program		$ 2,790,000,000
Treasury stock, shares acquired (shares)	0.3	1.2
Treasury stock, value of shares acquired	15,500,000	56,500,000
Remaining authorized repurchase amount		$ 713,400,000

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Other Comprehensive Income (Loss) (Tables)

6 Months Ended

Jun. 30, 2013

Comprehensive Income Note Disclosure [Abstract]

Schedule of changes in each component of AOCI

The following table presents the changes in each component of accumulated other comprehensive income ("AOCI"), net of tax:

	Unrealized Gains on Available-For-Sale Securities			Foreign Currency Translation Adjustments			Total
Three Months Ended June 30, 2013
Beginning balance	$	260,725		$	(31,162	)	$	229,563
Other comprehensive income before reclassifications	(259,562		)	(5,407		)	(264,969		)
Amounts reclassified from accumulated other comprehensive income	(13,916		)	—			(13,916		)
Net current period other comprehensive income (loss)	(273,478		)	(5,407		)	(278,885		)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)
Six Months Ended June 30, 2013
Beginning balance	$	289,957		$	(2,940	)	$	287,017
Other comprehensive income before reclassifications	(250,093		)	(33,629		)	(283,722		)
Amounts reclassified from accumulated other comprehensive income	(52,617		)	—			(52,617		)
Net current period other comprehensive income (loss)	(302,710		)	(33,629		)	$	(336,339	)
Ending balance	$	(12,753	)	$	(36,569	)	$	(49,322	)

Details about amounts reclassified from AOCI

The following table presents details about amounts reclassified from accumulated other comprehensive income:

		Amounts Reclassed from AOCI
Details About AOCI Components	Consolidated Statement of Income Line Item That Includes Reclassification	Three Months Ended			Six Months Ended
		June 30, 2013			June 30, 2013
Unrealized Gains on Available-For-Sale Securities
	Net realized gains	$	14,634		$	58,999
	Net impairment losses included in earnings	(724		)	(2,970		)
	Total before tax	13,910			56,029
	Income tax benefit (expense)	6			(3,412		)
	Net of tax	$	13,916		$	52,617

Schedule of comprehensive income (loss)

The following table presents the tax effects allocated to each component of other comprehensive income (loss):

	Before Tax Amount			Tax Expense (Benefit)			Net of Tax Amount
Three Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(281,388	)	$	(21,826	)	$	(259,562	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	—			—			—
Less reclassification of net realized gains included in net income	13,910			(6		)	13,916
Foreign currency translation adjustments	(5,407		)	—			(5,407		)
Other comprehensive income (loss)	$	(300,705	)	$	(21,820	)	$	(278,885	)
Three Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	23,524		$	5,464		$	18,060
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(503		)	—			(503		)
Less reclassification of net realized gains included in net income	45,384			1,592			43,792
Foreign currency translation adjustments	(16,699		)	(1,563		)	(15,136		)
Other comprehensive income (loss)	$	(39,062	)	$	2,309		$	(41,371	)
Six Months Ended June 30, 2013
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	(271,043	)	$	(20,952	)	$	(250,091	)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(2		)	—			(2		)
Less reclassification of net realized gains included in net income	56,029			3,412			52,617
Foreign currency translation adjustments	(33,627		)	2			(33,629		)
Other comprehensive income (loss)	$	(360,701	)	$	(24,362	)	$	(336,339	)
Six Months Ended June 30, 2012
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains arising during period	$	109,241		$	(3,682	)	$	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss)	(511		)	—			(511		)
Less reclassification of net realized gains included in net income	76,143			4,840			71,303
Foreign currency translation adjustments	(2,830		)	(895		)	(1,935		)
Other comprehensive income (loss)	$	29,757		$	(9,417	)	$	39,174

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Fair Value (Text Items) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Fair Value Disclosures [Abstract]
Total assets and liabilities measured at fair value	$ 12,780,000,000		$ 12,780,000,000		$ 12,400,000,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes	1,450,000,000		1,450,000,000		927,900,000
Total assets and liabilities measured at fair value priced using non-binding broker quotes (percentage)	11.40%		11.40%		7.50%
Gains (losses) including in earnings attributable to the change in unrealized gains or losses related to assets still held at balance sheet date	(2,200,000)	(500,000)	4,400,000	1,900,000
Senior notes	300,000,000		300,000,000		300,000,000
Estimated fair value of senior notes	$ 368,800,000		$ 368,800,000

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Investment Information (Aging of Available For Sale Securities in an Unrealized Loss Position) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Available for sale securities:
Estimated Fair Value - Less than 12 Months	$ 6,485,764		$ 2,050,668
Gross Unrealized Losses - Less than 12 Months	(213,899)		(28,958)
Estimated Fair Value - 12 Months or More	133,705		373,325
Gross Unrealized Losses - 12 Months or More	(13,427)		(23,713)
Estimated Fair Value - Total	6,619,469		2,423,993
Gross Unrealized Losses - Total	227,326		52,671
Fixed maturities and fixed maturities pledged under securities lending agreements
Available for sale securities:
Estimated Fair Value - Less than 12 Months	5,945,503	[1]	1,839,019	[1]
Gross Unrealized Losses - Less than 12 Months	(177,637)	[1]	(15,036)	[1]
Estimated Fair Value - 12 Months or More	107,514	[1]	321,773	[1]
Gross Unrealized Losses - 12 Months or More	(9,877)	[1]	(20,840)	[1]
Estimated Fair Value - Total	6,053,017	[1]	2,160,792	[1]
Gross Unrealized Losses - Total	187,514	[1]	35,876	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Available for sale securities:
Estimated Fair Value - Less than 12 Months	1,737,631	[1]	490,784	[1]
Gross Unrealized Losses - Less than 12 Months	(58,235)	[1]	(3,692)	[1]
Estimated Fair Value - 12 Months or More	17,492	[1]	52,334	[1]
Gross Unrealized Losses - 12 Months or More	(2,029)	[1]	(3,018)	[1]
Estimated Fair Value - Total	1,755,123	[1]	543,118	[1]
Gross Unrealized Losses - Total	60,264	[1]	6,710	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Available for sale securities:
Estimated Fair Value - Less than 12 Months	1,015,422	[1]	537,883	[1]
Gross Unrealized Losses - Less than 12 Months	(45,242)	[1]	(4,290)	[1]
Estimated Fair Value - 12 Months or More	22,558	[1]	60,574	[1]
Gross Unrealized Losses - 12 Months or More	(1,320)	[1]	(3,194)	[1]
Estimated Fair Value - Total	1,037,980	[1]	598,457	[1]
Gross Unrealized Losses - Total	46,562	[1]	7,484	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Available for sale securities:
Estimated Fair Value - Less than 12 Months	578,711	[1]	147,766	[1]
Gross Unrealized Losses - Less than 12 Months	(13,690)	[1]	(1,120)	[1]
Estimated Fair Value - 12 Months or More	10,380	[1]	7,052	[1]
Gross Unrealized Losses - 12 Months or More	(532)	[1]	(301)	[1]
Estimated Fair Value - Total	589,091	[1]	154,818	[1]
Gross Unrealized Losses - Total	14,222	[1]	1,421	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Available for sale securities:
Estimated Fair Value - Less than 12 Months	450,164	[1]	36,649	[1]
Gross Unrealized Losses - Less than 12 Months	(13,132)	[1]	(2,261)	[1]
Estimated Fair Value - 12 Months or More	2,111	[1]	8,878	[1]
Gross Unrealized Losses - 12 Months or More	(208)	[1]	(2,207)	[1]
Estimated Fair Value - Total	452,275	[1]	45,527	[1]
Gross Unrealized Losses - Total	13,340	[1]	4,468	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Available for sale securities:
Estimated Fair Value - Less than 12 Months	621,953	[1]	146,526	[1]
Gross Unrealized Losses - Less than 12 Months	(7,251)	[1]	(1,095)	[1]
Estimated Fair Value - 12 Months or More	0	[1]	0	[1]
Gross Unrealized Losses - 12 Months or More	0	[1]	0	[1]
Estimated Fair Value - Total	621,953	[1]	146,526	[1]
Gross Unrealized Losses - Total	7,251	[1]	1,095	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Available for sale securities:
Estimated Fair Value - Less than 12 Months	726,472	[1]	244,827	[1]
Gross Unrealized Losses - Less than 12 Months	(25,265)	[1]	(1,070)	[1]
Estimated Fair Value - 12 Months or More	23,796	[1]	135,564	[1]
Gross Unrealized Losses - 12 Months or More	(2,662)	[1]	(7,790)	[1]
Estimated Fair Value - Total	750,268	[1]	380,391	[1]
Gross Unrealized Losses - Total	27,927	[1]	8,860	[1]
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Available for sale securities:
Estimated Fair Value - Less than 12 Months	815,150	[1]	234,584	[1]
Gross Unrealized Losses - Less than 12 Months	(14,822)	[1]	(1,508)	[1]
Estimated Fair Value - 12 Months or More	31,177	[1]	57,371	[1]
Gross Unrealized Losses - 12 Months or More	(3,126)	[1]	(4,330)	[1]
Estimated Fair Value - Total	846,327	[1]	291,955	[1]
Gross Unrealized Losses - Total	17,948	[1]	5,838	[1]
Equity securities
Available for sale securities:
Estimated Fair Value - Less than 12 Months	181,248		130,385
Gross Unrealized Losses - Less than 12 Months	(16,499)		(10,200)
Estimated Fair Value - 12 Months or More	2,996		16,469
Gross Unrealized Losses - 12 Months or More	(335)		(2,090)
Estimated Fair Value - Total	184,244		146,854
Gross Unrealized Losses - Total	16,834		12,290
Other investments
Available for sale securities:
Estimated Fair Value - Less than 12 Months	197,537		23,849
Gross Unrealized Losses - Less than 12 Months	(15,113)		(2,474)
Estimated Fair Value - 12 Months or More	23,195		35,083
Gross Unrealized Losses - 12 Months or More	(3,215)		(783)
Estimated Fair Value - Total	220,732		58,932
Gross Unrealized Losses - Total	18,328		3,257
Short-term investments
Available for sale securities:
Estimated Fair Value - Less than 12 Months	161,476		57,415
Gross Unrealized Losses - Less than 12 Months	(4,650)		(1,248)
Estimated Fair Value - 12 Months or More	0		0
Gross Unrealized Losses - 12 Months or More	0		0
Estimated Fair Value - Total	161,476		57,415
Gross Unrealized Losses - Total	$ 4,650		$ 1,248

[1] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

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Investment Information (Other Than Temporary Impairments Recognized in Earnings) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	$ (724)	$ (1,951)	$ (2,970)	$ (2,974)
Fixed Maturities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(1,689)	(35)	(2,631)
Fixed Maturities | Mortgage backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(146)	(15)	(892)
Fixed Maturities | Corporate bonds
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(1,166)	0	(1,362)
Fixed Maturities | Non-US government securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(261)	0	(261)
Fixed Maturities | Asset backed securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(106)	(20)	(106)
Fixed Maturities | US government and government agencies
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(10)	0	(10)
Investment of funds received under securities lending arrangements
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	0	(6)	0	(87)
Equity securities
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Line Items]
Net impairment losses recognized in earnings	$ (724)	$ (256)	$ (2,935)	$ (256)

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Other Comprehensive Income (Loss) - Components of accumulated other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	$ 229,563		$ 287,017
Other comprehensive income before reclassifications	(264,969)		(283,722)
Amounts reclassified from accumulated other comprehensive income	(13,916)	(43,792)	(52,617)	(71,303)
Net current period other comprehensive income (loss)	(278,885)	(41,371)	(336,339)	39,174
Ending balance	(49,322)		(49,322)
Unrealized gains on available-for-sale securities
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	260,725		289,957
Other comprehensive income before reclassifications	(259,562)		(250,093)
Amounts reclassified from accumulated other comprehensive income	(13,916)		(52,617)
Net current period other comprehensive income (loss)	(273,478)		(302,710)
Ending balance	(12,753)		(12,753)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning balance	(31,162)		(2,940)
Other comprehensive income before reclassifications	(5,407)		(33,629)
Amounts reclassified from accumulated other comprehensive income	0		0
Net current period other comprehensive income (loss)	(5,407)		(33,629)
Ending balance	$ (36,569)		$ (36,569)

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Earnings Per Common Share (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Numerator:
Net income	$ 176,940		$ 220,268		$ 433,416		$ 384,524
Preferred dividends	(5,485)		(7,649)		(10,969)		(14,110)
Loss on repurchase of preferred shares	0		(10,612)		0		(10,612)
Net income available to common shareholders	$ 171,455		$ 202,007		$ 422,447		$ 359,802
Denominator:
Weighted average common shares outstanding — basic	131,377,274		134,529,129		131,143,885		134,241,876
Effect of dilutive common share equivalents:
Nonvested restricted shares	1,088,030		800,455		1,181,947		909,524
Stock options	3,383,746	[1]	2,882,152	[1]	3,298,394	[1]	2,866,090	[1]
Weighted average common shares and common share equivalents outstanding — diluted	135,849,050		138,211,736		135,624,226		138,017,490
Earnings per common share:
Basic (per share)	$ 1.31		$ 1.50		$ 3.22		$ 2.68
Diluted (per share)	$ 1.26		$ 1.46		$ 3.11		$ 2.61
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from computation of earnings per common share (shares)	1,428,616		912,056		1,730,313		688,634

[1] Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2013 second quarter and 2012 second quarter, the number of stock options excluded were 1,428,616 and 912,056, respectively. For the six months ended June 30, 2013 and 2012, the number of stock options excluded were 1,730,313 and 688,634, respectively.

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Investment Information (Text Items) (Details) (USD $)	Jun. 30, 2013 lots	Dec. 31, 2012 lots
Continuous unrealized loss, qualitative disclosures:
Number of positions in an unrealized loss position (lots)	2,410	910
Total number of positions (lots)	4,590	4,580
Largest single loss	$ 4,000,000	$ 2,500,000
Securities lending, qualitative disclosures:
Fair value of fixed maturities and short-term investments pledged under securities lending agreements	47,800,000	50,800,000
Amortized cost of fixed maturities and short-term investments pledged under securities lending agreements	48,100,000	49,600,000
Fair value of securities backing securities lending program	41,062,000	42,531,000
Approximate fair value of sub-prime securities backing the securities lending program	$ 6,300,000	$ 5,400,000

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Derivative Instruments (Tables)

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Fair value and notional amount of derivatives

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments. The fair value of TBAs is included in “fixed maturities available for sale, at fair value” while the fair value of all other derivatives is included in “other investments available for sale, at fair value” in the consolidated balance sheets.

	Asset Derivatives		Liability Derivatives			Net Derivatives
	Fair Value		Fair Value			Fair Value			Notional Value
June 30, 2013
Futures contracts	$	160	$	(54	)	$	106		$	303,286
Foreign currency forward contracts	15,779		(7,605		)	8,174			887,815
TBAs	436,215		(270,629		)	165,586			687,560
Other	670		(40		)	630			203,466
Total	$	452,824	$	(278,328	)	$	174,496
December 31, 2012
Futures contracts	$	52	$	(52	)	$	—		$	340,400
Foreign currency forward contracts	2,809		(2,678		)	131			396,468
TBAs	23,599		(4,346		)	19,253			26,000
Other	448		(676		)	(228		)	50,341
Total	$	26,908	$	(7,752	)	$	19,156

Summary of net realized gains (losses) recorded in the consolidated statements of income

The following table summarizes net realized gains (losses) recorded on the Company’s derivative instruments in the consolidated statements of income:

	Three Months Ended						Six Months Ended
Derivatives not designated as	June 30,						June 30,
hedging instruments	2013			2012			2013			2012
Futures contracts	$	10,623		$	(2,322	)	$	9,794		$	(4,343	)
Foreign currency forward contracts	7,605			938			6,880			(943		)
TBAs	(3,751		)	1,419			(3,210		)	1,742
Other	1,169			242			1,804			(848		)
Total	$	15,646		$	277		$	15,268		$	(4,392	)

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Unaudited Consolidated Statements of Changes in Shareholders' Equity (USD $) In Thousands	Total	Non-Cumulative Preferred Shares	Common Shares	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Common Shares Held in Treasury, at Cost
Balance at beginning of year at Dec. 31, 2011		$ 325,000	$ 549	$ 161,419	$ 4,796,655	$ 153,923	$ (845,472)
Shares issued - Series C		325,000
Common shares issued, net			7	4,553
Issue costs on Series C preferred shares				(9,398)
Shares repurchased - Series A and B		(325,000)		10,612	(10,612)
Exercise of stock options				4,822
Amortization of share-based compensation				23,930
Other				1,687
Net income	384,524				384,524
Dividends declared on preferred shares	(14,110)				(14,110)
Change in unrealized appreciation (decline) in value of investments, net of deferred income tax						41,620
Portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(511)					(511)
Foreign currency translation adjustments, net of deferred income tax	(1,935)					(1,935)
Shares repurchased for treasury							(6,947)
Balance at end of period at Jun. 30, 2012	5,020,316	325,000	556	197,625	5,156,457	193,097	(852,419)
Balance at beginning of year at Dec. 31, 2012	5,168,878	325,000	561	227,778	5,354,361	287,017	(1,025,839)
Common shares issued, net			3	5,362
Exercise of stock options				6,022
Amortization of share-based compensation				31,466
Other				2,327
Net income	433,416				433,416
Dividends declared on preferred shares	(10,969)				(10,969)
Change in unrealized appreciation (decline) in value of investments, net of deferred income tax						(302,708)
Portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	(2)					(2)
Foreign currency translation adjustments, net of deferred income tax	(33,629)					(33,629)
Shares repurchased for treasury							(65,848)
Balance at end of period at Jun. 30, 2013	$ 5,234,318	$ 325,000	$ 564	$ 272,955	$ 5,776,808	$ (49,322)	$ (1,091,687)

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General

6 Months Ended

Jun. 30, 2013

Organization, Consolidation and Presentation of Financial Statements [Abstract]

General

General

Arch Capital Group Ltd. (“ACGL”) is a Bermuda public limited liability company which provides insurance and reinsurance on a worldwide basis through its wholly owned subsidiaries.

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of ACGL and its wholly owned subsidiaries (together with ACGL, the “Company”). All significant intercompany transactions and balances have been eliminated in consolidation. The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

Certain information and footnote disclosures normally included in financial statements prepared in accordance with GAAP have been condensed or omitted; however, management believes that the disclosures are adequate to make the information presented not misleading. This report should be read in conjunction with the Company’s Annual Report on Form 10-K for the year ended December 31, 2012, including the Company’s audited consolidated financial statements and related notes.

The Company has reclassified the presentation of certain prior year information to conform to the current presentation. Such reclassifications had no effect on the Company’s net income, comprehensive income, shareholders’ equity or cash flows. Tabular amounts are in U.S. Dollars in thousands, except share amounts, unless otherwise noted.

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Commitments and Contingencies

6 Months Ended

Jun. 30, 2013

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

Letter of Credit and Revolving Credit Facilities

As of June 30, 2013, the Company had a $300 million unsecured revolving loan and letter of credit facility and a $500 million secured letter of credit facility (the “Credit Agreement”). The Credit Agreement expires on August 18, 2014. In addition, the Company had access to secured letter of credit facilities of approximately $113.9 million as of June 30, 2013, which are available on a limited basis and for limited purposes (together with the secured portion of the Credit Agreement and these letter of credit facilities, the “LOC Facilities”). At June 30, 2013, the Company had $412.7 million in outstanding letters of credit under the LOC Facilities, which were secured by investments with a fair value of $481.3 million, and had $100.0 million of borrowings outstanding under the Credit Agreement. The Company was in compliance with all covenants contained in the LOC Facilities at June 30, 2013.

Investment Commitments

The Company’s investment commitments, which are primarily related to agreements entered into by the Company to invest in funds and separately managed accounts when called upon, were approximately $751.0 million at June 30, 2013.

Acquisition of CMG Mortgage Insurance Company and Mortgage Insurance Operating Platform of PMI

In February 2013, certain of the Company's U.S.-based subsidiaries (collectively “Arch U.S. MI”) entered into a definitive agreement to acquire (1) CMG Mortgage Insurance Company (“CMG MI”) from its current owners, PMI Mortgage Insurance Co. in rehabilitation (“PMI”), which has been under the receivership of the Arizona Department of Insurance since 2011, and CMFG Life Insurance Company, and (2) PMI's mortgage insurance operating platform and certain related assets from PMI. In connection with the closing of the transactions, PMI and an affiliate of the Company's U.S.-based subsidiaries will enter into a quota share reinsurance agreement pursuant to which such affiliate, as the reinsurer, will agree to provide 100% quota share indemnity reinsurance to PMI for all certificates of insurance that were issued by PMI between and including January 1, 2009 and December 31, 2011 that are not in default as of an agreed upon effective date. At closing, it is currently estimated that the Company's U.S.-based subsidiaries will pay aggregate consideration of approximately $300 million under all transaction documents. Additional amounts may be paid based on the actual results of CMG MI's pre-closing portfolio over an agreed upon period. In addition, the Company will enter into a services agreement with PMI to provide for necessary services to administer the run-off of PMI's legacy business at the direction of PMI.

On June 20, 2013, the Arizona receivership court provided the required approval of the acquisition. The transaction is also subject to approvals of the applicable regulators and approvals by the Federal National Mortgage Association and the Federal Home Loan Mortgage Corporation of Arch U.S. MI as an eligible insurance carrier in the U.S. mortgage insurance marketplace, as well as the satisfaction of customary closing conditions. In connection with obtaining such consents of regulatory authorities and government-sponsored entities, it is anticipated that Arch U.S. MI or its affiliates will be required to make certain financial commitments to CMG MI, the form and amount of which will be determined based upon discussions with such authorities and entities. Arch U.S. MI's obligation to the sellers to accept financial requirements imposed by regulatory authorities and government-sponsored entities will be determined on the basis of, among other things, the appropriateness of such requirements in light of Arch U.S. MI's business plan and the consistency of such requirements with those imposed on other active participants in the U.S. mortgage insurance industry, as described in the purchase agreements. If these approvals are obtained, it is expected the transaction will close during the latter part of 2013.

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Share Transactions

6 Months Ended

Jun. 30, 2013

Stockholders' Equity Note [Abstract]

Share Transactions

Share Transactions

Share Repurchases

The board of directors of ACGL has authorized the investment in ACGL’s common shares through a share repurchase program. Repurchases under the program may be effected from time to time in open market or privately negotiated transactions through December 2014. Since the inception of the share repurchase program, ACGL has repurchased approximately 109.9 million common shares for an aggregate purchase price of $2.79 billion. During the 2013 second quarter and six months ended June 30, 2013, ACGL repurchased 0.3 million and 1.2 million common shares, respectively, for an aggregate purchase price of $15.5 million and $56.5 million, respectively. No share repurchases were made in the comparable 2012 periods. At June 30, 2013, $713.4 million of share repurchases were available under the program. The timing and amount of the repurchase transactions under this program will depend on a variety of factors, including market conditions and corporate and regulatory considerations.

Share-Based Compensation

During the 2013 second quarter, the Company made a stock grant of 516,859 stock appreciation rights and stock options and 544,075 restricted shares and units to certain employees and directors with weighted average grant-date fair values of $13.35 and $53.50 per share, respectively. During the 2012 second quarter, the Company made a stock grant of 782,248 stock appreciation rights and stock options and 728,864 restricted shares and units with weighted average grant-date fair values of $9.91 and $38.59 per share, respectively. The stock appreciation rights and stock options were valued at the grant date using the Black-Scholes option pricing model. Such values are being amortized over the respective substantive vesting period. For awards granted to retirement-eligible employees where no service is required for the employee to retain the award, the grant date fair value is immediately recognized as compensation expense at the grant date because the employee is able to retain the award without continuing to provide service. For employees near retirement eligibility, attribution of compensation cost is over the period from the grant date to the retirement eligibility date.

Loss on Repurchase of Preferred Shares

The Company issued $325.0 million of 6.75% Series C preferred shares in April 2012 and subsequently redeemed all of its $200.0 million of 8.0% Series A preferred shares and $125.0 million of 7.875% Series B preferred shares at a redemption price equal to $25.00 per share in May 2012. In accordance with GAAP, upon issuance of the Series A and B preferred shares in 2006, costs of $10.6 million were recognized as a reduction of additional paid-in capital in shareholders' equity. Following the redemption of such shares, such issue costs were recorded as a “loss on repurchase of preferred shares” to remove the costs from additional paid-in capital in the second quarter of 2012, as revised and as disclosed in the Company’s Annual Report on Form 10-K for the year ended December 31, 2012 (see Note 16 and Note 21).

.

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Investment Information (Other Than Temporary Impairments Rollforward) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Disclosure Investment Information [Abstract]
Portion of OTTI not related to credit losses	$ 13,000,000		$ 13,000,000
Rollforward:
Balance at start of period	61,956,000	67,086,000	62,001,000	66,545,000
Credit loss impairments recognized on securities not previously impaired	0	1,693,000	33,000	1,905,000
Credit loss impairments recognized on securities previously impaired	0	258,000	2,000	1,069,000
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	0	0	0	0
Reductions for securities sold during the period	(507,000)	(6,511,000)	(587,000)	(6,993,000)
Balance at end of period	$ 61,449,000	$ 62,526,000	$ 61,449,000	$ 62,526,000

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Share Transactions - Share-Based Compensation (Details) (USD $)	3 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Stock Appreciation Rights And Options [Member]
Share-based compensation:
Share-based compensation, grants in period, shares	516,859	782,248
Weighted average grant date fair value of awards granted in period	$ 13.35	$ 9.91
Restricted Shares And Restricted Stock Units [Member]
Share-based compensation:
Share-based compensation, grants in period, shares	544,075	728,864
Weighted average grant date fair value of awards granted in period	$ 53.50	$ 38.59

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Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Segment Reporting Information [Line Items]
Gross premiums written	$ 1,040,738	[1]	$ 1,051,813	[1]	$ 2,204,437	[1]	$ 2,118,469	[1]
Net premiums written	810,535		820,233		1,763,311		1,683,844
Net premiums earned	758,816		726,656		1,511,586		1,406,968
Fee income	902		806		1,440		1,349
Losses and loss adjustment expenses	(418,653)		(399,693)		(818,056)		(794,900)
Acquisition expenses, net	(131,677)		(128,289)		(259,269)		(247,251)
Other operating expenses	(113,359)		(105,757)		(223,274)		(205,250)
Underwriting income (loss)	96,029		93,723		212,427		160,916
Net investment income	68,369		73,608		134,041		147,905
Net realized gains	12,652		34,867		70,992		78,988
Net impairment losses recognized in earnings	(724)		(1,951)		(2,970)		(2,974)
Equity in net income (loss) of investment funds accounted for using the equity method	10,941		7,787		24,764		32,613
Other income (loss)	834		695		2,078		(7,373)
Other expenses	(14,049)		(11,944)		(24,317)		(18,923)
Interest expense	(5,852)		(7,439)		(11,750)		(14,960)
Net foreign exchange (gains) losses	13,811		31,689		38,075		11,001
Income before income taxes	182,011		221,035		443,340		387,193
Income tax expense (benefit)	(5,071)		(767)		(9,924)		(2,669)
Net income	176,940		220,268		433,416		384,524
Preferred dividends	(5,485)		(7,649)		(10,969)		(14,110)
Loss on repurchase of preferred shares	0		(10,612)		0		(10,612)
Net income available to common shareholders	171,455		202,007		422,447		359,802
Underwriting Ratios
Loss ratio	55.20%		55.00%		54.10%		56.50%
Acquisition expense ratio	17.30%	[2]	17.60%	[2]	17.10%	[2]	17.50%	[2]
Other operating expense ratio	14.90%		14.60%		14.80%		14.60%
Combined ratio	87.40%		87.20%		86.00%		88.60%
Insurance
Segment Reporting Information [Line Items]
Gross premiums written	703,904	[1]	676,090	[1]	1,392,721	[1]	1,364,203	[1]
Net premiums written	501,568		464,584		1,006,118		955,264
Net premiums earned	458,656		446,594		903,621		888,334
Fee income	529		628		1,054		1,158
Losses and loss adjustment expenses	(291,192)		(290,416)		(574,659)		(593,580)
Acquisition expenses, net	(74,249)		(76,058)		(145,007)		(149,928)
Other operating expenses	(80,167)		(76,617)		(156,482)		(149,987)
Underwriting income (loss)	13,577		4,131		28,527		(4,003)
Underwriting Ratios
Loss ratio	63.50%		65.00%		63.60%		66.80%
Acquisition expense ratio	16.10%	[2]	16.90%	[2]	15.90%	[2]	16.70%	[2]
Other operating expense ratio	17.50%		17.20%		17.30%		16.90%
Combined ratio	97.10%		99.10%		96.80%		100.40%
Reinsurance
Segment Reporting Information [Line Items]
Gross premiums written	337,642	[1]	376,981	[1]	813,847	[1]	756,957	[1]
Net premiums written	308,967		355,649		757,193		728,580
Net premiums earned	300,160		280,062		607,965		518,634
Fee income	373		178		386		191
Losses and loss adjustment expenses	(127,461)		(109,277)		(243,397)		(201,320)
Acquisition expenses, net	(57,428)		(52,231)		(114,262)		(97,323)
Other operating expenses	(33,192)		(29,140)		(66,792)		(55,263)
Underwriting income (loss)	$ 82,452		$ 89,592		$ 183,900		$ 164,919
Underwriting Ratios
Loss ratio	42.50%		39.00%		40.00%		38.80%
Acquisition expense ratio	19.10%	[2]	18.60%	[2]	18.80%	[2]	18.80%	[2]
Other operating expense ratio	11.10%		10.40%		11.00%		10.70%
Combined ratio	72.70%		68.00%		69.80%		68.30%

[1] Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

[2] The acquisition expense ratio is adjusted to include policy-related fee income.

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Investment Information (Fair Value Option) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments accounted for using the fair value option	$ 1,065,684		$ 917,466
Securities sold but not yet purchased	0	[1]	(6,924)	[1]
Net assets accounting for using the fair value option	1,065,684		910,542
Fixed Maturities
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments accounted for using the fair value option	353,310		363,541
Other investments
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments accounted for using the fair value option	712,374		527,971
Equity securities
Fair Value, Option, Quantitative Disclosures [Line Items]
Investments accounted for using the fair value option	$ 0		$ 25,954

[1] Represents the Company’s obligation to deliver equity securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

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Other Comprehensive Income (Loss) - Amounts reclassified from accumulated other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net impairment losses recognized in earnings	$ (724)	$ (1,951)	$ (2,970)	$ (2,974)
Income before income taxes	182,011	221,035	443,340	387,193
Income tax expense	(5,071)	(767)	(9,924)	(2,669)
Net of tax	176,940	220,268	433,416	384,524
Reclassification out of accumulated other comprehensive income | Unrealized gains on available-for-sale securities
Reclassification out of Accumulated Other Comprehensive Income [Line Items]
Net realized gains	14,634		58,999
Net impairment losses recognized in earnings	(724)		(2,970)
Income before income taxes	13,910		56,029
Income tax expense	6		(3,412)
Net of tax	$ 13,916		$ 52,617

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Fair Value (Rollforward of Level 3 assets) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	$ 462,602		$ 102,870		$ 477,956		$ 97,215
Total gains or (losses) (realized/unrealized) - included in earnings	1,112	[1]	(548)	[1]	7,739	[1]	1,864	[1]
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	2,596		(3,861)		2,820		(497)
Purchases, issuances, sales and settlements
Purchases	118,916		0		165,570		0
Issuances	0		0		0		0
Sales	(96,655)		0		(96,655)		0
Settlements	(6,129)		(39)		(74,988)		(160)
Transfers in and/or out of Level 3	0		0		0		0
Balance at end of period	482,442		98,422		482,442		98,422
Available for sale | Corporate bonds
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	97,298		96,655		98,404		92,091
Total gains or (losses) (realized/unrealized) - included in earnings	3,187	[1]	(548)	[1]	4,679	[1]	1,783	[1]
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	(1,363)		(4,032)		(3,051)		(1,759)
Purchases, issuances, sales and settlements
Purchases	0		0		0		0
Issuances	0		0		0		0
Sales	(96,655)		0		(96,655)		0
Settlements	(107)		(39)		(1,017)		(79)
Transfers in and/or out of Level 3	0		0		0		0
Balance at end of period	2,360		92,036		2,360		92,036
Available for sale | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	185,934		6,215		184,202		5,124
Total gains or (losses) (realized/unrealized) - included in earnings	0	[1]	0	[1]	4,762	[1]	81	[1]
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	3,959		171		5,871		1,262
Purchases, issuances, sales and settlements
Purchases	0		0		5,000		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	0		0		(9,942)		(81)
Transfers in and/or out of Level 3	0		0		0		0
Balance at end of period	189,893		6,386		189,893		6,386
Fair value option | Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Balance at beginning of period	179,370		0		195,350		0
Total gains or (losses) (realized/unrealized) - included in earnings	(2,075)	[1]	0	[1]	(1,702)	[1]	0	[1]
Total gains or (losses) (realized/unrealized) - included in other comprehensive income	0		0		0		0
Purchases, issuances, sales and settlements
Purchases	118,916		0		160,570		0
Issuances	0		0		0		0
Sales	0		0		0		0
Settlements	(6,022)		0		(64,029)		0
Transfers in and/or out of Level 3	0		0		0		0
Balance at end of period	$ 290,189		$ 0		$ 290,189		$ 0

[1] Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

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Unaudited Consolidated Balance Sheets (Parentheticals) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Fixed maturities available for sale, at amortized cost	$ 9,619,842	$ 9,567,290
Short-term investments available for sale, at amortized cost	1,095,497	719,848
Investment of funds received under securities lending agreements, at cost	39,079	42,302
Equity securities, at cost	410,219	298,414
Other investments, at cost	555,422	519,955
Investment in joint venture, at cost	$ 100,000	$ 100,000
Common shares, par value per share	$ 0.0033	$ 0.0033
Common shares issued (shares)	169,245,371	168,255,572
Common shares held in treasury (shares)	35,828,952	34,412,959

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Investment Information

6 Months Ended

Jun. 30, 2013

Disclosure Investment Information [Abstract]

Investment Information

Investment Information

Available For Sale Investments

The following table summarizes the fair value and cost or amortized cost of the Company’s investments classified as available for sale:

	Fair Value		Gross Unrealized Gains		Gross Unrealized Losses			Cost or Amortized Cost		OTTI Unrealized Losses (2)
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	33,423	$	(60,264	)	$	2,499,971	$	—
Mortgage backed securities	1,592,207		16,874		(46,562		)	1,621,895		(9,330		)
Municipal bonds	1,507,924		35,880		(14,222		)	1,486,266		(17		)
Commercial mortgage backed securities	838,471		15,687		(13,340		)	836,124		(231		)
U.S. government and government agencies	975,345		8,744		(7,251		)	973,852		(19		)
Non-U.S. government securities	1,002,989		9,671		(27,927		)	1,021,245		—
Asset backed securities	1,225,183		17,677		(17,948		)	1,225,454		(3,348		)
Total	9,615,249		137,956		(187,514		)	9,664,807		(12,945		)
Equity securities	438,038		44,653		(16,834		)	410,219		—
Other investments	569,407		32,313		(18,328		)	555,422		—
Short-term investments	1,094,129		174		(4,650		)	1,098,605		—
Total	$	11,716,823	$	215,096	$	(227,326	)	$	11,729,053	$	(12,945	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	105,798	$	(6,710	)	$	2,758,425	$	(62	)
Mortgage backed securities	1,532,736		24,809		(7,484		)	1,515,411		(9,329		)
Municipal bonds	1,463,586		62,322		(1,421		)	1,402,685		(17		)
Commercial mortgage backed securities	824,165		37,514		(4,468		)	791,119		(270		)
U.S. government and government agencies	1,131,688		20,178		(1,095		)	1,112,605		(19		)
Non-U.S. government securities	998,901		33,701		(8,860		)	974,060		—
Asset backed securities	1,073,999		25,528		(5,838		)	1,054,309		(3,346		)
Total	9,882,588		309,850		(35,876		)	9,608,614		(13,043		)
Equity securities	312,749		26,625		(12,290		)	298,414		—
Other investments	549,280		32,582		(3,257		)	519,955		—
Short-term investments	730,369		3,521		(1,248		)	728,096		—
Total	$	11,474,986	$	372,578	$	(52,671	)	$	11,155,079	$	(13,043	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

(2) Represents the total other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income (“AOCI”). It does not include the change in fair value subsequent to the impairment measurement date. At June 30, 2013, the net unrealized gain related to securities for which a non-credit OTTI was recognized in AOCI was $4.2 million, compared to a net unrealized gain of $2.0 million at December 31, 2012.

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	1,737,631	$	(58,235	)	$	17,492	$	(2,029	)	$	1,755,123	$	(60,264	)
Mortgage backed securities	1,015,422		(45,242		)	22,558		(1,320		)	1,037,980		(46,562		)
Municipal bonds	578,711		(13,690		)	10,380		(532		)	589,091		(14,222		)
Commercial mortgage backed securities	450,164		(13,132		)	2,111		(208		)	452,275		(13,340		)
U.S. government and government agencies	621,953		(7,251		)	—		—			621,953		(7,251		)
Non-U.S. government securities	726,472		(25,265		)	23,796		(2,662		)	750,268		(27,927		)
Asset backed securities	815,150		(14,822		)	31,177		(3,126		)	846,327		(17,948		)
Total	5,945,503		(177,637		)	107,514		(9,877		)	6,053,017		(187,514		)
Equity securities	181,248		(16,499		)	2,996		(335		)	184,244		(16,834		)
Other investments	197,537		(15,113		)	23,195		(3,215		)	220,732		(18,328		)
Short-term investments	161,476		(4,650		)	—		—			161,476		(4,650		)
Total	$	6,485,764	$	(213,899	)	$	133,705	$	(13,427	)	$	6,619,469	$	(227,326	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	490,784	$	(3,692	)	$	52,334	$	(3,018	)	$	543,118	$	(6,710	)
Mortgage backed securities	537,883		(4,290		)	60,574		(3,194		)	598,457		(7,484		)
Municipal bonds	147,766		(1,120		)	7,052		(301		)	154,818		(1,421		)
Commercial mortgage backed securities	36,649		(2,261		)	8,878		(2,207		)	45,527		(4,468		)
U.S. government and government agencies	146,526		(1,095		)	—		—			146,526		(1,095		)
Non-U.S. government securities	244,827		(1,070		)	135,564		(7,790		)	380,391		(8,860		)
Asset backed securities	234,584		(1,508		)	57,371		(4,330		)	291,955		(5,838		)
Total	1,839,019		(15,036		)	321,773		(20,840		)	2,160,792		(35,876		)
Equity securities	130,385		(10,200		)	16,469		(2,090		)	146,854		(12,290		)
Other investments	23,849		(2,474		)	35,083		(783		)	58,932		(3,257		)
Short-term investments	57,415		(1,248		)	—		—			57,415		(1,248		)
Total	$	2,050,668	$	(28,958	)	$	373,325	$	(23,713	)	$	2,423,993	$	(52,671	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

At June 30, 2013, on a lot level basis, approximately 2,410 security lots out of a total of approximately 4,590 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $4.0 million. At December 31, 2012, on a lot level basis, approximately 910 security lots out of a total of approximately 4,580 security lots were in an unrealized loss position and the largest single unrealized loss from a single lot in the Company’s fixed maturity portfolio was $2.5 million.

The contractual maturities of the Company’s fixed maturities and fixed maturities pledged under securities lending agreements are shown in the following table. Expected maturities, which are management’s best estimates, will differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

	June 30, 2013				December 31, 2012
Maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Due in one year or less	$	281,901	$	276,338	$	446,402	$	436,376
Due after one year through five years	3,358,388		3,356,354		3,876,062		3,769,426
Due after five years through 10 years	2,082,358		2,108,760		1,949,297		1,869,698
Due after 10 years	236,741		239,882		179,927		172,275
	5,959,388		5,981,334		6,451,688		6,247,775
Mortgage backed securities	1,592,207		1,621,895		1,532,736		1,515,411
Commercial mortgage backed securities	838,471		836,124		824,165		791,119
Asset backed securities	1,225,183		1,225,454		1,073,999		1,054,309
Total	$	9,615,249	$	9,664,807	$	9,882,588	$	9,608,614

Securities Lending Agreements

The Company operates a securities lending program under which certain of its fixed income portfolio securities are loaned to third parties, primarily major brokerage firms, for short periods of time through a lending agent. The fair value and amortized cost of fixed maturities and short-term investments pledged under securities lending agreements were $47.8 million and $48.1 million, respectively, at June 30, 2013, compared to $50.8 million and $49.6 million, respectively, at December 31, 2012. The fair value of the portfolio of collateral backing the Company's securities lending program was $41.1 million at June 30, 2013, compared to $42.5 million at December 31, 2012. Such amounts included approximately $6.3 million of sub-prime securities at June 30, 2013, compared to $5.4 million at December 31, 2012. The Company maintains legal control over the securities it lends, retains the earnings and cash flows associated with the loaned securities and receives a fee from the borrower for the temporary use of the securities. An indemnification agreement with the lending agent protects the Company in the event a borrower becomes insolvent or fails to return any of the securities on loan to the Company. 

Other Investments

The following table summarizes the Company's other investments, including available for sale and fair value option components:

	June 30, 2013		December 31, 2012
Available for sale:
Asian and emerging markets	$	343,535	$	316,860
Investment grade fixed income	219,068		220,410
Other	6,804		12,010
Total available for sale	569,407		549,280
Fair value option:
Term loan investments (par value: $475,397 and $307,016)	481,773		308,596
Asian and emerging markets	28,932		24,035
Investment grade fixed income	74,320		67,624
Non-investment grade fixed income	9,331		11,093
Other (1)	118,018		116,623
Total fair value option	$	712,374	$	527,971
Total	$	1,281,781	$	1,077,251

_________________________________________________

(1) Includes fund investments with strategies in mortgage servicing rights, transportation and infrastructure assets and other.

Certain of the Company's other investments are in investment funds for which the Company has the option to redeem at agreed upon values as described in each investment fund's subscription agreement. Depending on the terms of the various subscription agreements, investments in investment funds may be redeemed daily, monthly, quarterly or on other terms. Two common redemption restrictions which may impact the Company's ability to redeem these investment funds are gates and lockups. A gate is a suspension of redemptions which may be implemented by the general partner or investment manager of the fund in order to defer, in whole or in part, the redemption request in the event the aggregate amount of redemption requests exceeds a predetermined percentage of the investment fund's net assets which may otherwise hinder the general partner or investment manager's ability to liquidate holdings in an orderly fashion in order to generate the cash necessary to fund extraordinarily large redemption payouts. A lockup period is the initial amount of time an investor is contractually required to hold the security before having the ability to redeem. If the investment funds are eligible to be redeemed, the time to redeem such fund can take weeks or months following the notification.

Fair Value Option

The Company elected to carry certain fixed maturity securities, equity securities and other investments (primarily term loans) at fair value under the fair value option afforded by accounting guidance regarding the fair value option for financial assets and liabilities. Changes in fair value of investments accounted for using the fair value option are included in net realized gains or losses while interest income, dividends received and distributions from fund investments which are not a return of capital are reflected in net investment income. The primary reasons for electing the fair value option were to reflect economic events in earnings on a timely basis and to address practicality and cost-benefit considerations.

The following table summarizes the Company’s assets and liabilities which are accounted for using the fair value option:

	June 30, 2013		December 31, 2012
Fixed maturities	$	353,310	$	363,541
Other investments	712,374		527,971
Equity securities	—		25,954
Investments accounted for using the fair value option	1,065,684		917,466
Securities sold but not yet purchased (1)	—		(6,924		)
Net assets accounted for using the fair value option	$	1,065,684	$	910,542

_________________________________________________

(1) Represents the Company’s obligation to deliver equity securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

Net Investment Income

The components of net investment income were derived from the following sources:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities	$	62,004		$	70,290		$	124,010		$	143,740
Term loan investments (1)	6,026			3,557			10,243			5,856
Equity securities	3,164			2,425			4,587			4,089
Short-term investments	364			760			756			1,132
Other (2)	4,734			2,980			11,033			6,173
Gross investment income	76,292			80,012			150,629			160,990
Investment expenses	(7,923		)	(6,404		)	(16,588		)	(13,085		)
Net investment income	$	68,369		$	73,608		$	134,041		$	147,905

_________________________________________________

(1) Included in “investments accounted for using the fair value option” on the Company’s consolidated balance sheets.

(2) Amounts include dividends on investment funds and other items.

Net Realized Gains (Losses)

Net realized gains (losses) were as follows, excluding other-than-temporary impairment provisions:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Available for sale securities:
Gross gains on investment sales	$	68,853		$	67,936		$	135,873		$	115,948
Gross losses on investment sales	(54,783		)	(20,757		)	(79,839		)	(38,693		)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(6,702		)	(4,810		)	(1,644		)	3,407
Equity securities	5			(3,589		)	704			(202		)
Other investments	(9,502		)	(1,744		)	449			2,009
TALF investments	—			(1,274		)	—			(50		)
TALF borrowings	—			(176		)	—			895
Derivative instruments (1)	15,646			277			15,268			(4,392		)
Other	(865		)	(996		)	181			66
Net realized gains	$	12,652		$	34,867		$	70,992		$	78,988

_________________________________________________

(1) See Note 9 for information on the Company’s derivative instruments.

Other-Than-Temporary Impairments

The Company performs quarterly reviews of its available for sale investments in order to determine whether declines in fair value below the amortized cost basis were considered other-than-temporary in accordance with applicable guidance. The following table details the net impairment losses recognized in earnings by asset class:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities:
Mortgage backed securities	$	—		$	(146	)	$	(15	)	$	(892	)
Corporate bonds	—			(1,166		)	—			(1,362		)
Non-U.S. government securities	—			(261		)	—			(261		)
Asset backed securities	—			(106		)	(20		)	(106		)
U.S. government and government agencies	—			(10		)	—			(10		)
Total	—			(1,689		)	(35		)	(2,631		)
Investment of funds received under securities lending agreements	—			(6		)	—			(87		)
Equity securities	(724		)	(256		)	(2,935		)	(256		)
Net impairment losses recognized in earnings	$	(724	)	$	(1,951	)	$	(2,970	)	$	(2,974	)

A description of the methodology and significant inputs used to measure the amount of net impairment losses recognized in earnings in the 2013 periods is as follows:

• Equity securities — the Company utilized information received from asset managers on common stocks, including the business prospects, recent events, industry and market data and other factors. For certain equities which were in an unrealized loss position and where the Company determined that it did not have the intent or ability to hold such securities for a reasonable period of time by which the fair value of the securities would increase and the Company would recover its cost, the cost basis of such securities was adjusted down accordingly;

• Mortgage backed and asset backed securities — the Company utilized underlying data provided by asset managers, cash flow projections and additional information from credit agencies in order to determine an expected recovery value for each security. The analysis includes expected cash flow projections under base case and stress case scenarios which modify the expected default expectations and loss severities and slow down prepayment assumptions. The significant inputs in the models include the expected default rates, delinquency rates and foreclosure costs. The expected recovery values were reduced on a small number of securities, primarily as a result of increases in expected default expectations and foreclosure costs. The amortized cost basis of the securities were adjusted down, if required, to the expected recovery value calculated in the OTTI review process.

The Company believes that the $13.0 million of OTTI included in accumulated other comprehensive income at June 30, 2013 on the securities which were considered by the Company to be impaired was due to market and sector-related factors (i.e., not credit losses). At June 30, 2013, the Company did not intend to sell these securities, or any other securities which were in an unrealized loss position, and determined that it is more likely than not that the Company will not be required to sell such securities before recovery of their cost basis.

The following table provides a roll forward of the amount related to credit losses recognized in earnings for which a portion of an OTTI was recognized in accumulated other comprehensive income:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Balance at start of period	$	61,956		$	67,086		$	62,001		$	66,545
Credit loss impairments recognized on securities not previously impaired	—			1,693			33			1,905
Credit loss impairments recognized on securities previously impaired	—			258			2			1,069
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	—			—			—			—
Reductions for securities sold during the period	(507		)	(6,511		)	(587		)	(6,993		)
Balance at end of period	$	61,449		$	62,526		$	61,449		$	62,526

Restricted Assets

The Company is required to maintain assets on deposit, which primarily consist of fixed maturities, with various regulatory authorities to support its insurance and reinsurance operations. The Company’s insurance and reinsurance subsidiaries maintain assets in trust accounts as collateral for insurance and reinsurance transactions with affiliated companies and also have investments in segregated portfolios primarily to provide collateral or guarantees for letters of credit to third parties. See Note 4, “Commitments and Contingencies—Letter of Credit and Revolving Credit Facilities,” for further details. The following table details the value of the Company’s restricted assets:

	June 30, 2013		December 31, 2012
Assets used for collateral or guarantees:
Affiliated transactions	$	4,226,334	$	4,062,097
Third party agreements	793,162		771,631
Deposits with U.S. regulatory authorities	302,572		290,441
Deposits with non-U.S. regulatory authorities	6,591		247,321
Trust funds	103,021		96,342
Total restricted assets	$	5,431,680	$	5,467,832

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Unaudited Consolidated Statements of Comprehensive Income (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Comprehensive Income (Loss)
Net income	$ 176,940	$ 220,268	$ 433,416	$ 384,524
Unrealized appreciation (decline) in value of investments:
Unrealized holding gains (losses) arising during period	(259,562)	18,060	(250,091)	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income, net of deferred income tax	0	(503)	(2)	(511)
Reclassification of net realized gains, net of income taxes, included in net income	(13,916)	(43,792)	(52,617)	(71,303)
Foreign currency translation adjustments, net of deferred income tax	(5,407)	(15,136)	(33,629)	(1,935)
Other comprehensive income (loss)	(278,885)	(41,371)	(336,339)	39,174
Comprehensive Income (Loss)	$ (101,945)	$ 178,897	$ 97,077	$ 423,698

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Unaudited Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Investments:
Fixed maturities available for sale, at fair value (amortized cost: $9,619,842 and $9,567,290)	$ 9,570,583	$ 9,839,988
Short-term investments available for sale, at fair value (amortized cost: $1,095,497 and $719,848)	1,091,032	722,121
Investment of funds received under securities lending, at fair value (amortized cost: $39,079 and $42,302)	41,062	42,531
Equity securities available for sale, at fair value (cost: $410,219 and $298,414)	438,038	312,749
Other investments available for sale, at fair value (cost: $555,422 and $519,955)	569,407	549,280
Investments accounted for using the fair value option	1,065,684	917,466
Investments accounted for using the equity method	208,796	307,105
Total investments	12,984,602	12,691,240
Cash	375,119	371,041
Accrued investment income	68,413	71,748
Investment in joint venture (cost: $100,000)	108,710	107,284
Fixed maturities and short-term investments pledged under securities lending, at fair value	47,763	50,848
Premiums receivable	876,989	688,873
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	1,849,891	1,870,037
Contractholder receivables	947,887	865,728
Prepaid reinsurance premiums	330,854	298,484
Deferred acquisition costs, net	313,010	262,822
Receivable for securities sold	447,545	19,248
Other assets	566,900	519,409
Total Assets	18,917,683	17,816,762
Liabilities
Reserve for losses and loss adjustment expenses	8,808,594	8,933,292
Unearned premiums	1,921,849	1,647,978
Reinsurance balances payable	210,113	188,546
Contractholder payables	947,887	865,728
Senior notes	300,000	300,000
Revolving credit agreement borrowings	100,000	100,000
Securities lending payable	49,135	52,356
Payable for securities purchased	853,156	37,788
Other liabilities	492,631	522,196
Total Liabilities	13,683,365	12,647,884
Commitments and Contingencies
Shareholders’ Equity
Non-cumulative preferred shares	325,000	325,000
Common shares ($0.0033 par, shares issued: 169,245,371 and 168,255,572)	564	561
Additional paid-in capital	272,955	227,778
Retained earnings	5,776,808	5,354,361
Accumulated other comprehensive income (loss), net of deferred income tax	(49,322)	287,017
Common shares held in treasury, at cost (shares: 35,828,952 and 34,412,959)	(1,091,687)	(1,025,839)
Total Shareholders' Equity	5,234,318	5,168,878
Total Liabilities and Shareholders' Equity	$ 18,917,683	$ 17,816,762

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Other Comprehensive Income (Loss) - Components of other comprehensive income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Before tax amount:
Unrealized holding gains arising during period, before tax	$ (281,388)	$ 23,524	$ (271,043)	$ 109,241
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss), before tax	0	(503)	(2)	(511)
Less reclassification of net realized gains included in net income, before tax	13,910	45,384	56,029	76,143
Foreign currency translation adjustments, before tax	(5,407)	(16,699)	(33,627)	(2,830)
Other comprehensive income (loss), before tax	(300,705)	(39,062)	(360,701)	29,757
Tax expense (benefit):
Unrealized holding gains arising during period, tax	(21,826)	5,464	(20,952)	(3,682)
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss), tax	0	0	0	0
Less reclassification of net realized gains included in net income, tax	(6)	1,592	3,412	4,840
Foreign currency translation adjustments, tax	0	(1,563)	2	(895)
Other comprehensive income (loss), tax	(21,820)	2,309	(24,362)	(9,417)
Net of tax amount:
Unrealized holding gains arising during period, net of tax	(259,562)	18,060	(250,091)	112,923
Portion of other-than-temporary impairment losses recognized in other comprehensive income (loss), net of tax	0	(503)	(2)	(511)
Less reclassification of net realized gains included in net income, net of tax	13,916	43,792	52,617	71,303
Foreign currency translation adjustments, net of tax	(5,407)	(15,136)	(33,629)	(1,935)
Net current period other comprehensive income (loss)	$ (278,885)	$ (41,371)	$ (336,339)	$ 39,174

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Share Transactions - Loss on Repurchase of Preferred Shares (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended			1 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	May 31, 2012	Apr. 30, 2012 Series C Preferred Shares	May 31, 2012 Series A Preferred Shares	May 31, 2012 Series B Preferred Shares	May 31, 2012 Series A and B Preferred Shares
Class of Stock [Line Items]
Shares issued - Series C			$ 0	$ 315,789		$ 325,000
Shares redeemed during period, value							200,000	125,000
Preferred shares, dividend rate (as a percent)						6.75%	8.00%	7.875%
Preferred shares, redemption price per share					$ 25.00
Loss on repurchase of preferred shares	$ 0	$ 10,612	$ 0	$ 10,612					$ 10,600

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Investment Information (Tables)

6 Months Ended

Jun. 30, 2013

Disclosure Investment Information [Abstract]

Summary of fair value and cost or amortized cost of available for sale securities

The following table summarizes the fair value and cost or amortized cost of the Company’s investments classified as available for sale:

	Fair Value		Gross Unrealized Gains		Gross Unrealized Losses			Cost or Amortized Cost		OTTI Unrealized Losses (2)
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	33,423	$	(60,264	)	$	2,499,971	$	—
Mortgage backed securities	1,592,207		16,874		(46,562		)	1,621,895		(9,330		)
Municipal bonds	1,507,924		35,880		(14,222		)	1,486,266		(17		)
Commercial mortgage backed securities	838,471		15,687		(13,340		)	836,124		(231		)
U.S. government and government agencies	975,345		8,744		(7,251		)	973,852		(19		)
Non-U.S. government securities	1,002,989		9,671		(27,927		)	1,021,245		—
Asset backed securities	1,225,183		17,677		(17,948		)	1,225,454		(3,348		)
Total	9,615,249		137,956		(187,514		)	9,664,807		(12,945		)
Equity securities	438,038		44,653		(16,834		)	410,219		—
Other investments	569,407		32,313		(18,328		)	555,422		—
Short-term investments	1,094,129		174		(4,650		)	1,098,605		—
Total	$	11,716,823	$	215,096	$	(227,326	)	$	11,729,053	$	(12,945	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	105,798	$	(6,710	)	$	2,758,425	$	(62	)
Mortgage backed securities	1,532,736		24,809		(7,484		)	1,515,411		(9,329		)
Municipal bonds	1,463,586		62,322		(1,421		)	1,402,685		(17		)
Commercial mortgage backed securities	824,165		37,514		(4,468		)	791,119		(270		)
U.S. government and government agencies	1,131,688		20,178		(1,095		)	1,112,605		(19		)
Non-U.S. government securities	998,901		33,701		(8,860		)	974,060		—
Asset backed securities	1,073,999		25,528		(5,838		)	1,054,309		(3,346		)
Total	9,882,588		309,850		(35,876		)	9,608,614		(13,043		)
Equity securities	312,749		26,625		(12,290		)	298,414		—
Other investments	549,280		32,582		(3,257		)	519,955		—
Short-term investments	730,369		3,521		(1,248		)	728,096		—
Total	$	11,474,986	$	372,578	$	(52,671	)	$	11,155,079	$	(13,043	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

(2) Represents the total other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income (“AOCI”). It does not include the change in fair value subsequent to the impairment measurement date. At June 30, 2013, the net unrealized gain related to securities for which a non-credit OTTI was recognized in AOCI was $4.2 million, compared to a net unrealized gain of $2.0 million at December 31, 2012.

Summary of available for sale securities in a continual unrealized loss position

The following table summarizes, for all available for sale securities in an unrealized loss position, the fair value and gross unrealized loss by length of time the security has been in a continual unrealized loss position:

	Less than 12 Months					12 Months or More					Total
	Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses			Fair Value		Gross Unrealized Losses
June 30, 2013
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	1,737,631	$	(58,235	)	$	17,492	$	(2,029	)	$	1,755,123	$	(60,264	)
Mortgage backed securities	1,015,422		(45,242		)	22,558		(1,320		)	1,037,980		(46,562		)
Municipal bonds	578,711		(13,690		)	10,380		(532		)	589,091		(14,222		)
Commercial mortgage backed securities	450,164		(13,132		)	2,111		(208		)	452,275		(13,340		)
U.S. government and government agencies	621,953		(7,251		)	—		—			621,953		(7,251		)
Non-U.S. government securities	726,472		(25,265		)	23,796		(2,662		)	750,268		(27,927		)
Asset backed securities	815,150		(14,822		)	31,177		(3,126		)	846,327		(17,948		)
Total	5,945,503		(177,637		)	107,514		(9,877		)	6,053,017		(187,514		)
Equity securities	181,248		(16,499		)	2,996		(335		)	184,244		(16,834		)
Other investments	197,537		(15,113		)	23,195		(3,215		)	220,732		(18,328		)
Short-term investments	161,476		(4,650		)	—		—			161,476		(4,650		)
Total	$	6,485,764	$	(213,899	)	$	133,705	$	(13,427	)	$	6,619,469	$	(227,326	)
December 31, 2012
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	490,784	$	(3,692	)	$	52,334	$	(3,018	)	$	543,118	$	(6,710	)
Mortgage backed securities	537,883		(4,290		)	60,574		(3,194		)	598,457		(7,484		)
Municipal bonds	147,766		(1,120		)	7,052		(301		)	154,818		(1,421		)
Commercial mortgage backed securities	36,649		(2,261		)	8,878		(2,207		)	45,527		(4,468		)
U.S. government and government agencies	146,526		(1,095		)	—		—			146,526		(1,095		)
Non-U.S. government securities	244,827		(1,070		)	135,564		(7,790		)	380,391		(8,860		)
Asset backed securities	234,584		(1,508		)	57,371		(4,330		)	291,955		(5,838		)
Total	1,839,019		(15,036		)	321,773		(20,840		)	2,160,792		(35,876		)
Equity securities	130,385		(10,200		)	16,469		(2,090		)	146,854		(12,290		)
Other investments	23,849		(2,474		)	35,083		(783		)	58,932		(3,257		)
Short-term investments	57,415		(1,248		)	—		—			57,415		(1,248		)
Total	$	2,050,668	$	(28,958	)	$	373,325	$	(23,713	)	$	2,423,993	$	(52,671	)

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

Contractual maturities of the Company's fixed maturities and fixed maturities pledged under securities lending arrangements

	June 30, 2013				December 31, 2012
Maturity	Fair Value		Amortized Cost		Fair Value		Amortized Cost
Due in one year or less	$	281,901	$	276,338	$	446,402	$	436,376
Due after one year through five years	3,358,388		3,356,354		3,876,062		3,769,426
Due after five years through 10 years	2,082,358		2,108,760		1,949,297		1,869,698
Due after 10 years	236,741		239,882		179,927		172,275
	5,959,388		5,981,334		6,451,688		6,247,775
Mortgage backed securities	1,592,207		1,621,895		1,532,736		1,515,411
Commercial mortgage backed securities	838,471		836,124		824,165		791,119
Asset backed securities	1,225,183		1,225,454		1,073,999		1,054,309
Total	$	9,615,249	$	9,664,807	$	9,882,588	$	9,608,614

Summary of other investments, including available for sale and fair value option components

The following table summarizes the Company's other investments, including available for sale and fair value option components:

	June 30, 2013		December 31, 2012
Available for sale:
Asian and emerging markets	$	343,535	$	316,860
Investment grade fixed income	219,068		220,410
Other	6,804		12,010
Total available for sale	569,407		549,280
Fair value option:
Term loan investments (par value: $475,397 and $307,016)	481,773		308,596
Asian and emerging markets	28,932		24,035
Investment grade fixed income	74,320		67,624
Non-investment grade fixed income	9,331		11,093
Other (1)	118,018		116,623
Total fair value option	$	712,374	$	527,971
Total	$	1,281,781	$	1,077,251

Summary of assets and liabilities accounted for using the fair value option

The following table summarizes the Company’s assets and liabilities which are accounted for using the fair value option:

	June 30, 2013		December 31, 2012
Fixed maturities	$	353,310	$	363,541
Other investments	712,374		527,971
Equity securities	—		25,954
Investments accounted for using the fair value option	1,065,684		917,466
Securities sold but not yet purchased (1)	—		(6,924		)
Net assets accounted for using the fair value option	$	1,065,684	$	910,542

_________________________________________________

(1) Represents the Company’s obligation to deliver equity securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

Components of net investment income

The components of net investment income were derived from the following sources:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities	$	62,004		$	70,290		$	124,010		$	143,740
Term loan investments (1)	6,026			3,557			10,243			5,856
Equity securities	3,164			2,425			4,587			4,089
Short-term investments	364			760			756			1,132
Other (2)	4,734			2,980			11,033			6,173
Gross investment income	76,292			80,012			150,629			160,990
Investment expenses	(7,923		)	(6,404		)	(16,588		)	(13,085		)
Net investment income	$	68,369		$	73,608		$	134,041		$	147,905

_________________________________________________

(1) Included in “investments accounted for using the fair value option” on the Company’s consolidated balance sheets.

(2) Amounts include dividends on investment funds and other items.

Summary of net realized gains (losses)

Net realized gains (losses) were as follows, excluding other-than-temporary impairment provisions:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Available for sale securities:
Gross gains on investment sales	$	68,853		$	67,936		$	135,873		$	115,948
Gross losses on investment sales	(54,783		)	(20,757		)	(79,839		)	(38,693		)
Change in fair value of assets and liabilities accounted for using the fair value option:
Fixed maturities	(6,702		)	(4,810		)	(1,644		)	3,407
Equity securities	5			(3,589		)	704			(202		)
Other investments	(9,502		)	(1,744		)	449			2,009
TALF investments	—			(1,274		)	—			(50		)
TALF borrowings	—			(176		)	—			895
Derivative instruments (1)	15,646			277			15,268			(4,392		)
Other	(865		)	(996		)	181			66
Net realized gains	$	12,652		$	34,867		$	70,992		$	78,988

_________________________________________________

(1) See Note 9 for information on the Company’s derivative instruments.

Summary of OTTI recognized in earnings by asset class

The following table details the net impairment losses recognized in earnings by asset class:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Fixed maturities:
Mortgage backed securities	$	—		$	(146	)	$	(15	)	$	(892	)
Corporate bonds	—			(1,166		)	—			(1,362		)
Non-U.S. government securities	—			(261		)	—			(261		)
Asset backed securities	—			(106		)	(20		)	(106		)
U.S. government and government agencies	—			(10		)	—			(10		)
Total	—			(1,689		)	(35		)	(2,631		)
Investment of funds received under securities lending agreements	—			(6		)	—			(87		)
Equity securities	(724		)	(256		)	(2,935		)	(256		)
Net impairment losses recognized in earnings	$	(724	)	$	(1,951	)	$	(2,970	)	$	(2,974	)

Rollforward of the amount related to credit losses recognized in earnings for which a portion was recognized in AOCI

The following table provides a roll forward of the amount related to credit losses recognized in earnings for which a portion of an OTTI was recognized in accumulated other comprehensive income:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Balance at start of period	$	61,956		$	67,086		$	62,001		$	66,545
Credit loss impairments recognized on securities not previously impaired	—			1,693			33			1,905
Credit loss impairments recognized on securities previously impaired	—			258			2			1,069
Reductions for increases in cash flows expected to be collected that are recognized over the remaining life of the security	—			—			—			—
Reductions for securities sold during the period	(507		)	(6,511		)	(587		)	(6,993		)
Balance at end of period	$	61,449		$	62,526		$	61,449		$	62,526

Summary of restricted assets

The following table details the value of the Company’s restricted assets:

	June 30, 2013		December 31, 2012
Assets used for collateral or guarantees:
Affiliated transactions	$	4,226,334	$	4,062,097
Third party agreements	793,162		771,631
Deposits with U.S. regulatory authorities	302,572		290,441
Deposits with non-U.S. regulatory authorities	6,591		247,321
Trust funds	103,021		96,342
Total restricted assets	$	5,431,680	$	5,467,832

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Fair Value (Fair Value Hierarchy) (Details) (Recurring, USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Estimated Fair Value
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	$ 12,782,507		$ 12,392,452
Liabilities measured at fair value	0		6,924
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	9,615,249	[1]	9,882,588	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	2,473,130	[1]	2,857,513	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,592,207	[1]	1,532,736	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,507,924	[1]	1,463,586	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	838,471	[1]	824,165	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	975,345	[1]	1,131,688	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,002,989	[1]	998,901	[1]
Estimated Fair Value | Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,225,183	[1]	1,073,999	[1]
Estimated Fair Value | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	438,038		312,749
Estimated Fair Value | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	569,407		549,280
Estimated Fair Value | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,094,129		730,369
Estimated Fair Value | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,065,684		917,466
Estimated Fair Value | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	293,976		275,132
Estimated Fair Value | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	59,334		88,409
Estimated Fair Value | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	712,374		527,971
Estimated Fair Value | Fair value option | Equity securities fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		25,954
Estimated Fair Value | Securities sold but not yet purchased
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	0	[2]	6,924	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	2,475,095		2,148,749
Liabilities measured at fair value	0		6,924
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	975,345	[1]	1,131,688	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	975,345	[1]	1,131,688	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	437,278		312,666
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,062,472		678,441
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		25,954
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Fair value option | Equity securities fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		25,954
Quoted Prices in Active Markets for Identical Assets (Level 1) | Securities sold but not yet purchased
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	0	[2]	6,924	[2]
Significant Other Observable Inputs (Level 2)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	9,824,970		9,765,747
Liabilities measured at fair value	0		0
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	8,637,544	[1]	8,652,496	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	2,470,770	[1]	2,759,109	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,592,207	[1]	1,532,736	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,507,924	[1]	1,463,586	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	838,471	[1]	824,165	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,002,989	[1]	998,901	[1]
Significant Other Observable Inputs (Level 2) | Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	1,225,183	[1]	1,073,999	[1]
Significant Other Observable Inputs (Level 2) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	760		83
Significant Other Observable Inputs (Level 2) | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	379,514		365,078
Significant Other Observable Inputs (Level 2) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	31,657		51,928
Significant Other Observable Inputs (Level 2) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	775,495		696,162
Significant Other Observable Inputs (Level 2) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	293,976		275,132
Significant Other Observable Inputs (Level 2) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	59,334		88,409
Significant Other Observable Inputs (Level 2) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	422,185		332,621
Significant Other Observable Inputs (Level 2) | Fair value option | Equity securities fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Other Observable Inputs (Level 2) | Securities sold but not yet purchased
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	0	[2]	0	[2]
Significant Unobservable Inputs (Level 3)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	482,442		477,956
Liabilities measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	2,360	[1]	98,404	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	2,360	[1]	98,404	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0	[1]	0	[1]
Significant Unobservable Inputs (Level 3) | Equity securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Other investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	189,893		184,202
Significant Unobservable Inputs (Level 3) | Short-term investments
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	290,189		195,350
Significant Unobservable Inputs (Level 3) | Fair value option | Corporate bonds
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Fair value option | Non-US government securities
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Fair value option | Other investments fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	290,189		195,350
Significant Unobservable Inputs (Level 3) | Fair value option | Equity securities fair value option
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets measured at fair value	0		0
Significant Unobservable Inputs (Level 3) | Securities sold but not yet purchased
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities measured at fair value	$ 0	[2]	$ 0	[2]

[1] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

[2] Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

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Investment Information (Net Realized Gains and Losses) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012
Net realized gains and losses:
Available for sale securities, gross gains on investment sales	$ 68,853		$ 67,936		$ 135,873		$ 115,948
Available for sale securities, gross losses on investment sales	(54,783)		(20,757)		(79,839)		(38,693)
Derivative instruments	15,646	[1]	277	[1]	15,268	[1]	(4,392)	[1]
Other	(865)		(996)		181		66
Net realized gains	12,652		34,867		70,992		78,988
Fixed Maturities
Net realized gains and losses:
Change in fair value of assets and liabilities accounted for using the fair value option	(6,702)		(4,810)		(1,644)		3,407
Equity securities
Net realized gains and losses:
Change in fair value of assets and liabilities accounted for using the fair value option	5		(3,589)		704		(202)
Other investments
Net realized gains and losses:
Change in fair value of assets and liabilities accounted for using the fair value option	(9,502)		(1,744)		449		2,009
TALF investments
Net realized gains and losses:
Change in fair value of assets and liabilities accounted for using the fair value option	0		(1,274)		0		(50)
TALF borrowings
Net realized gains and losses:
Change in fair value of assets and liabilities accounted for using the fair value option	$ 0		$ (176)		$ 0		$ 895

[1] See Note 9 for information on the Company’s derivative instruments.

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Investment Information (Maturity Profile of Available For Sale Securities) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Estimated Fair Value:
Estimated fair value	$ 9,570,583	$ 9,839,988
Amortized Cost:
Amortized cost	9,619,842	9,567,290
Fixed maturities and fixed maturities pledged under securities lending agreements
Estimated Fair Value:
Due in one year or less	281,901	446,402
Due after one year through five years	3,358,388	3,876,062
Due after five years through 10 years	2,082,358	1,949,297
Due after 10 years	236,741	179,927
Single maturity date	5,959,388	6,451,688
Estimated fair value	9,615,249	9,882,588
Amortized Cost:
Due in one year or less	276,338	436,376
Due after one year through five years	3,356,354	3,769,426
Due after five years through 10 years	2,108,760	1,869,698
Due after 10 years	239,882	172,275
Single maturity date	5,981,334	6,247,775
Amortized cost	9,664,807	9,608,614
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Estimated Fair Value:
Securities without single maturity date	1,592,207	1,532,736
Amortized Cost:
Securities without single maturity date	1,621,895	1,515,411
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Estimated Fair Value:
Securities without single maturity date	838,471	824,165
Amortized Cost:
Securities without single maturity date	836,124	791,119
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Estimated Fair Value:
Securities without single maturity date	1,225,183	1,073,999
Amortized Cost:
Securities without single maturity date	$ 1,225,454	$ 1,054,309

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Investment Information (Other Investments) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	$ 1,281,781		$ 1,077,251
Available for sale
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	569,407		549,280
Available for sale | Asian and emerging markets
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	343,535		316,860
Available for sale | Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	219,068		220,410
Available for sale | Other
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	6,804		12,010
Fair value option
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	712,374		527,971
Fair value option | Asian and emerging markets
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	28,932		24,035
Fair value option | Investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	74,320		67,624
Fair value option | Non-investment grade fixed income
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	9,331		11,093
Fair value option | Other
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	118,018	[1]	116,623	[1]
Fair value option | Term loan investments
Schedule Of Other Investments [Line Items]
Other investments and fair value option investments	481,773		308,596
Other investments par	$ 475,397		$ 307,016

[1] Includes fund investments with strategies in mortgage servicing rights, transportation and infrastructure assets and other.

XML

Segment Information

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Segment Information

Segment Information

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to common shareholders:

	Three Months Ended									Three Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	703,904		$	337,642		$	1,040,738		$	676,090		$	376,981		$	1,051,813
Net premiums written	501,568			308,967			810,535			464,584			355,649			820,233
Net premiums earned	$	458,656		$	300,160		$	758,816		$	446,594		$	280,062		$	726,656
Fee income	529			373			902			628			178			806
Losses and loss adjustment expenses	(291,192		)	(127,461		)	(418,653		)	(290,416		)	(109,277		)	(399,693		)
Acquisition expenses, net	(74,249		)	(57,428		)	(131,677		)	(76,058		)	(52,231		)	(128,289		)
Other operating expenses	(80,167		)	(33,192		)	(113,359		)	(76,617		)	(29,140		)	(105,757		)
Underwriting income	$	13,577		$	82,452		96,029			$	4,131		$	89,592		93,723
Net investment income							68,369									73,608
Net realized gains							12,652									34,867
Net impairment losses recognized in earnings							(724		)							(1,951		)
Equity in net income of investment funds accounted for using the equity method							10,941									7,787
Other income (loss)							834									695
Other expenses							(14,049		)							(11,944		)
Interest expense							(5,852		)							(7,439		)
Net foreign exchange gains							13,811									31,689
Income before income taxes							182,011									221,035
Income tax expense							(5,071		)							(767		)
Net income							176,940									220,268
Preferred dividends							(5,485		)							(7,649		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	171,455								$	202,007
Underwriting Ratios
Loss ratio	63.5		%	42.5		%	55.2		%	65.0		%	39.0		%	55.0		%
Acquisition expense ratio (2)	16.1		%	19.1		%	17.3		%	16.9		%	18.6		%	17.6		%
Other operating expense ratio	17.5		%	11.1		%	14.9		%	17.2		%	10.4		%	14.6		%
Combined ratio	97.1		%	72.7		%	87.4		%	99.1		%	68.0		%	87.2		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

	Six Months Ended									Six Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	1,392,721		$	813,847		$	2,204,437		$	1,364,203		$	756,957		$	2,118,469
Net premiums written	1,006,118			757,193			1,763,311			955,264			728,580			1,683,844
Net premiums earned	$	903,621		$	607,965		$	1,511,586		$	888,334		$	518,634		$	1,406,968
Fee income	1,054			386			1,440			1,158			191			1,349
Losses and loss adjustment expenses	(574,659		)	(243,397		)	(818,056		)	(593,580		)	(201,320		)	(794,900		)
Acquisition expenses, net	(145,007		)	(114,262		)	(259,269		)	(149,928		)	(97,323		)	(247,251		)
Other operating expenses	(156,482		)	(66,792		)	(223,274		)	(149,987		)	(55,263		)	(205,250		)
Underwriting income (loss)	$	28,527		$	183,900		212,427			$	(4,003	)	$	164,919		160,916
Net investment income							134,041									147,905
Net realized gains							70,992									78,988
Net impairment losses recognized in earnings							(2,970		)							(2,974		)
Equity in net income of investment funds accounted for using the equity method							24,764									32,613
Other income (loss)							2,078									(7,373		)
Other expenses							(24,317		)							(18,923		)
Interest expense							(11,750		)							(14,960		)
Net foreign exchange gains							38,075									11,001
Income before income taxes							443,340									387,193
Income tax expense							(9,924		)							(2,669		)
Net income							433,416									384,524
Preferred dividends							(10,969		)							(14,110		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	422,447								$	359,802
Underwriting Ratios
Loss ratio	63.6		%	40.0		%	54.1		%	66.8		%	38.8		%	56.5		%
Acquisition expense ratio (2)	15.9		%	18.8		%	17.1		%	16.7		%	18.8		%	17.5		%
Other operating expense ratio	17.3		%	11.0		%	14.8		%	16.9		%	10.7		%	14.6		%
Combined ratio	96.8		%	69.8		%	86.0		%	100.4		%	68.3		%	88.6		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

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Commitments and Contingencies (Details) (USD $) In Millions, unless otherwise specified	1 Months Ended				6 Months Ended
	Feb. 28, 2013	Jun. 30, 2013	Jun. 30, 2013 LOC Facilities [Member]	Jun. 30, 2013 Other secured letter of credit facilities	Jun. 30, 2013 Credit Agreement	Jun. 30, 2013 Unsecured revolving loan and letter of credit facility	Jun. 30, 2013 Secured letter of credit facility
Line of Credit Facility [Abstract]
Maximum borrowing capacity				$ 113.9		$ 300.0	$ 500.0
Credit facility expiration date					Aug. 18, 2014
Amount outstanding			412.7		100.0
Investments pledged as collateral			481.3
Unfunded Investment Commitments [Abstract]
Investment commitments		751.0
Quota share agreement percentage	100.00%
Estimate aggregate consideration to be paid at closing of acquisition of CMG	$ 300

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Investment Information (Restricted Assets) (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Restricted Assets [Line Items]
Restricted assets	$ 5,431,680	$ 5,467,832
Collateral or guarantees - affiliated transactions
Restricted Assets [Line Items]
Restricted assets	4,226,334	4,062,097
Collateral or guarantees - third party agreements
Restricted Assets [Line Items]
Restricted assets	793,162	771,631
Deposits with US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	302,572	290,441
Deposits with non-US regulatory authorities
Restricted Assets [Line Items]
Restricted assets	6,591	247,321
Trust funds
Restricted Assets [Line Items]
Restricted assets	$ 103,021	$ 96,342

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Derivative Instruments

6 Months Ended

Jun. 30, 2013

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivative Instruments

Derivative Instruments

The Company’s investment strategy allows for the use of derivative securities. The Company’s derivative instruments are recorded on its consolidated balance sheets at fair value. The fair values of those derivatives are based on quoted market prices. All realized and unrealized contract gains and losses are reflected in the Company’s results of operations. The Company utilizes exchange traded U.S. Treasury note, Eurodollar and other futures contracts and commodity futures to manage portfolio duration or replicate investment positions in its portfolios. Certain of the Company’s corporate bonds are managed in a global bond portfolio which incorporates the use of foreign currency forward contracts which are intended to provide an economic hedge against foreign currency movements on the portfolio’s non-U.S. Dollar denominated holdings. The Company routinely utilizes other foreign currency forward contracts, currency options, index futures contracts and other derivatives as part of its total return objective.

In addition, the Company purchases to-be-announced mortgage backed securities (“TBAs”) as part of its investment strategy. TBAs represent commitments to purchase a future issuance of agency mortgage backed securities. For the period between purchase of a TBA and issuance of the underlying security, the Company’s position is accounted for as a derivative. The Company purchases TBAs in both long and short positions to enhance investment performance and as part of its overall investment strategy. The Company did not hold any derivatives which were designated as hedging instruments at June 30, 2013 or December 31, 2012.

The following table summarizes information on the fair values and notional values of the Company’s derivative instruments. The fair value of TBAs is included in “fixed maturities available for sale, at fair value” while the fair value of all other derivatives is included in “other investments available for sale, at fair value” in the consolidated balance sheets.

	Asset Derivatives		Liability Derivatives			Net Derivatives
	Fair Value		Fair Value			Fair Value			Notional Value
June 30, 2013
Futures contracts	$	160	$	(54	)	$	106		$	303,286
Foreign currency forward contracts	15,779		(7,605		)	8,174			887,815
TBAs	436,215		(270,629		)	165,586			687,560
Other	670		(40		)	630			203,466
Total	$	452,824	$	(278,328	)	$	174,496
December 31, 2012
Futures contracts	$	52	$	(52	)	$	—		$	340,400
Foreign currency forward contracts	2,809		(2,678		)	131			396,468
TBAs	23,599		(4,346		)	19,253			26,000
Other	448		(676		)	(228		)	50,341
Total	$	26,908	$	(7,752	)	$	19,156

The Company's derivative instruments are generally traded under master netting agreements, which establish terms that apply to all derivative transactions with a counterparty. In the event of a bankruptcy or other stipulated event of default, such agreements provide that the non-defaulting party may elect to terminate all outstanding derivative transactions, in which case all individual derivative positions (loss or gain) with a counterparty are closed out and netted and replaced with a single amount, usually referred to as the termination amount, which is expressed in a single currency. The resulting single net amount, where positive, is payable to the party "in-the-money" regardless of whether or not it is the defaulting party, unless the parties have agreed that only the non-defaulting party is entitled to receive a termination payment where the net amount is positive and is in its favor. Effectively, contractual close-out netting reduces derivatives credit exposure from gross to net exposure. At June 30, 2013, asset derivatives and liability derivatives of $223.5 million and $76.8 million, respectively, were subject to a master netting agreement, compared to $26.9 million and $7.8 million, respectively, at December 31, 2012. The remaining derivatives included in the table above were not subject to a master netting agreement.

The following table summarizes net realized gains (losses) recorded on the Company’s derivative instruments in the consolidated statements of income:

	Three Months Ended						Six Months Ended
Derivatives not designated as	June 30,						June 30,
hedging instruments	2013			2012			2013			2012
Futures contracts	$	10,623		$	(2,322	)	$	9,794		$	(4,343	)
Foreign currency forward contracts	7,605			938			6,880			(943		)
TBAs	(3,751		)	1,419			(3,210		)	1,742
Other	1,169			242			1,804			(848		)
Total	$	15,646		$	277		$	15,268		$	(4,392	)

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Earnings Per Common Share

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Earnings Per Common Share

Earnings Per Common Share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Numerator:
Net income	$	176,940		$	220,268		$	433,416		$	384,524
Preferred dividends	(5,485		)	(7,649		)	(10,969		)	(14,110		)
Loss on repurchase of preferred shares	—			(10,612		)	—			(10,612		)
Net income available to common shareholders	$	171,455		$	202,007		$	422,447		$	359,802
Denominator:
Weighted average common shares outstanding — basic	131,377,274			134,529,129			131,143,885			134,241,876
Effect of dilutive common share equivalents:
Nonvested restricted shares	1,088,030			800,455			1,181,947			909,524
Stock options (1)	3,383,746			2,882,152			3,298,394			2,866,090
Weighted average common shares and common share equivalents outstanding — diluted	135,849,050			138,211,736			135,624,226			138,017,490
Earnings per common share:
Basic	$	1.31		$	1.50		$	3.22		$	2.68
Diluted	$	1.26		$	1.46		$	3.11		$	2.61

_________________________________________________

(1) Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2013 second quarter and 2012 second quarter, the number of stock options excluded were 1,428,616 and 912,056, respectively. For the six months ended June 30, 2013 and 2012, the number of stock options excluded were 1,730,313 and 688,634, respectively.

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Unaudited Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Operating Activities
Net income	$ 433,416	$ 384,524
Adjustments to reconcile net income to net cash provided by operating activities:
Net realized gains	(73,611)	(80,753)
Net impairment losses recognized in earnings	2,970	2,974
Equity in net income or loss of investment funds accounted for using the equity method and other income or loss	37,493	(18,141)
Share-based compensation	31,466	23,930
Changes in:
Reserve for losses and loss adjustment expenses, net of unpaid losses and loss adjustment expenses recoverable	(33,163)	107,670
Unearned premiums, net of prepaid reinsurance premiums	251,724	276,877
Premiums receivable	(205,044)	(273,735)
Deferred acquisition costs, net	(51,971)	(45,390)
Reinsurance balances payable	24,267	37,129
Other liabilities	(26,981)	(2,526)
Other items, net	(2,212)	(15,291)
Net Cash Provided By Operating Activities	388,354	397,268
Investing Activities
Purchases of fixed maturity investments	(8,599,697)	(7,546,498)
Purchases of equity securities	(272,323)	(110,303)
Purchases of other investments	(648,915)	(386,243)
Proceeds from the sale of fixed maturity investments	8,468,641	6,887,186
Proceeds from the sale of equity securities	194,212	198,485
Proceeds from the sale of other investments	506,434	216,964
Proceeds from redemptions and maturities of fixed maturity investments	424,953	598,792
Net purchases of short-term investments	(375,146)	(174,607)
Change in investment of securities lending collateral	3,221	(17,837)
Purchase of business, net of cash acquired	0	(28,948)
Purchases of furniture, equipment and other assets	(7,092)	(10,208)
Net Cash Used For Investing Activities	(305,712)	(315,321)
Financing Activities
Proceeds from issuance of Series C preferred shares, net	0	315,789
Repurchase of Series A and B preferred shares	0	(325,000)
Purchases of common shares under share repurchase program	(56,463)	0
Proceeds from common shares issued, net	(517)	348
Repayments of borrowings	0	(73,773)
Change in securities lending collateral	(3,221)	17,837
Other	5,042	3,464
Preferred dividends paid	(10,969)	(17,412)
Net Cash Used For Financing Activities	(66,128)	(78,747)
Effects of exchange rate changes on foreign currency cash	(12,436)	493
Increase in cash	4,078	3,693
Cash beginning of year	371,041	351,699
Cash end of period	$ 375,119	$ 355,392

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Derivative Instruments (Details) (USD $)	3 Months Ended				6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012		Jun. 30, 2013		Jun. 30, 2012		Dec. 31, 2012
Derivative offsetting [Abstract]
Derivative assets subject to master netting agreements	$ 223,500,000				$ 223,500,000				$ 26,900,000
Derivative liabilities subject to master netting agreements	76,800,000				76,800,000				7,800,000
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	15,646,000	[1]	277,000	[1]	15,268,000	[1]	(4,392,000)	[1]
Not Designated as Hedging Instrument [Member]
Derivative [Line Items]
Asset derivatives - fair value	452,824,000				452,824,000				26,908,000
Liability derivatives - fair value	(278,328,000)				(278,328,000)				(7,752,000)
Net derivatives - fair value	174,496,000				174,496,000				19,156,000
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	15,646,000		277,000		15,268,000		(4,392,000)
Not Designated as Hedging Instrument [Member] | Futures contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	10,623,000		(2,322,000)		9,794,000		(4,343,000)
Not Designated as Hedging Instrument [Member] | Futures contracts | Other investments available for sale, at fair value
Derivative [Line Items]
Asset derivatives - fair value	160,000				160,000				52,000
Liability derivatives - fair value	(54,000)				(54,000)				(52,000)
Net derivatives - fair value	106,000				106,000				0
Net derivatives - notional value	303,286,000				303,286,000				340,400,000
Not Designated as Hedging Instrument [Member] | Foreign currency forward contracts
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	7,605,000		938,000		6,880,000		(943,000)
Not Designated as Hedging Instrument [Member] | Foreign currency forward contracts | Other investments available for sale, at fair value
Derivative [Line Items]
Asset derivatives - fair value	15,779,000				15,779,000				2,809,000
Liability derivatives - fair value	(7,605,000)				(7,605,000)				(2,678,000)
Net derivatives - fair value	8,174,000				8,174,000				131,000
Net derivatives - notional value	887,815,000				887,815,000				396,468,000
Not Designated as Hedging Instrument [Member] | TBAs
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	(3,751,000)		1,419,000		(3,210,000)		1,742,000
Not Designated as Hedging Instrument [Member] | TBAs | Fixed maturities available for sale, at fair value
Derivative [Line Items]
Asset derivatives - fair value	436,215,000				436,215,000				23,599,000
Liability derivatives - fair value	(270,629,000)				(270,629,000)				(4,346,000)
Net derivatives - fair value	165,586,000				165,586,000				19,253,000
Net derivatives - notional value	687,560,000				687,560,000				26,000,000
Not Designated as Hedging Instrument [Member] | Other
Net realized gains (losses) on derivative instruments
Net realized gains (losses) on derivative instruments	1,169,000		242,000		1,804,000		(848,000)
Not Designated as Hedging Instrument [Member] | Other | Other investments available for sale, at fair value
Derivative [Line Items]
Asset derivatives - fair value	670,000				670,000				448,000
Liability derivatives - fair value	(40,000)				(40,000)				(676,000)
Net derivatives - fair value	630,000				630,000				(228,000)
Net derivatives - notional value	$ 203,466,000				$ 203,466,000				$ 50,341,000

[1] See Note 9 for information on the Company’s derivative instruments.

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Investment Information (Summary of Available for Sale Securities) (Details) (USD $)	6 Months Ended		12 Months Ended
	Jun. 30, 2013		Dec. 31, 2012
Available for sale securities:
Estimated Fair Value	$ 11,716,823,000		$ 11,474,986,000
Gross Unrealized Gains	215,096,000		372,578,000
Gross Unrealized Losses	(227,326,000)		(52,671,000)
Cost or Amortized Cost	11,729,053,000		11,155,079,000
OTTI Unrealized Losses	(12,945,000)	[1]	(13,043,000)	[1]
Available for sale securities, other information:
OTTI unrealized losses at current fair value	4,200,000		2,000,000
Fixed maturities and fixed maturities pledged under securities lending agreements
Available for sale securities:
Estimated Fair Value	9,615,249,000	[2]	9,882,588,000	[2]
Gross Unrealized Gains	137,956,000	[2]	309,850,000	[2]
Gross Unrealized Losses	(187,514,000)	[2]	(35,876,000)	[2]
Cost or Amortized Cost	9,664,807,000	[2]	9,608,614,000	[2]
OTTI Unrealized Losses	(12,945,000)	[1],[2]	(13,043,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Corporate bonds
Available for sale securities:
Estimated Fair Value	2,473,130,000	[2]	2,857,513,000	[2]
Gross Unrealized Gains	33,423,000	[2]	105,798,000	[2]
Gross Unrealized Losses	(60,264,000)	[2]	(6,710,000)	[2]
Cost or Amortized Cost	2,499,971,000	[2]	2,758,425,000	[2]
OTTI Unrealized Losses	0	[1],[2]	(62,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Mortgage backed securities
Available for sale securities:
Estimated Fair Value	1,592,207,000	[2]	1,532,736,000	[2]
Gross Unrealized Gains	16,874,000	[2]	24,809,000	[2]
Gross Unrealized Losses	(46,562,000)	[2]	(7,484,000)	[2]
Cost or Amortized Cost	1,621,895,000	[2]	1,515,411,000	[2]
OTTI Unrealized Losses	(9,330,000)	[1],[2]	(9,329,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Municipal bonds
Available for sale securities:
Estimated Fair Value	1,507,924,000	[2]	1,463,586,000	[2]
Gross Unrealized Gains	35,880,000	[2]	62,322,000	[2]
Gross Unrealized Losses	(14,222,000)	[2]	(1,421,000)	[2]
Cost or Amortized Cost	1,486,266,000	[2]	1,402,685,000	[2]
OTTI Unrealized Losses	(17,000)	[1],[2]	(17,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Commercial mortgage backed securities
Available for sale securities:
Estimated Fair Value	838,471,000	[2]	824,165,000	[2]
Gross Unrealized Gains	15,687,000	[2]	37,514,000	[2]
Gross Unrealized Losses	(13,340,000)	[2]	(4,468,000)	[2]
Cost or Amortized Cost	836,124,000	[2]	791,119,000	[2]
OTTI Unrealized Losses	(231,000)	[1],[2]	(270,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | US government and government agencies
Available for sale securities:
Estimated Fair Value	975,345,000	[2]	1,131,688,000	[2]
Gross Unrealized Gains	8,744,000	[2]	20,178,000	[2]
Gross Unrealized Losses	(7,251,000)	[2]	(1,095,000)	[2]
Cost or Amortized Cost	973,852,000	[2]	1,112,605,000	[2]
OTTI Unrealized Losses	(19,000)	[1],[2]	(19,000)	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Non-US government securities
Available for sale securities:
Estimated Fair Value	1,002,989,000	[2]	998,901,000	[2]
Gross Unrealized Gains	9,671,000	[2]	33,701,000	[2]
Gross Unrealized Losses	(27,927,000)	[2]	(8,860,000)	[2]
Cost or Amortized Cost	1,021,245,000	[2]	974,060,000	[2]
OTTI Unrealized Losses	0	[1],[2]	0	[1],[2]
Fixed maturities and fixed maturities pledged under securities lending agreements | Asset backed securities
Available for sale securities:
Estimated Fair Value	1,225,183,000	[2]	1,073,999,000	[2]
Gross Unrealized Gains	17,677,000	[2]	25,528,000	[2]
Gross Unrealized Losses	(17,948,000)	[2]	(5,838,000)	[2]
Cost or Amortized Cost	1,225,454,000	[2]	1,054,309,000	[2]
OTTI Unrealized Losses	(3,348,000)	[1],[2]	(3,346,000)	[1],[2]
Equity securities
Available for sale securities:
Estimated Fair Value	438,038,000		312,749,000
Gross Unrealized Gains	44,653,000		26,625,000
Gross Unrealized Losses	(16,834,000)		(12,290,000)
Cost or Amortized Cost	410,219,000		298,414,000
OTTI Unrealized Losses	0	[1]	0	[1]
Other investments
Available for sale securities:
Estimated Fair Value	569,407,000		549,280,000
Gross Unrealized Gains	32,313,000		32,582,000
Gross Unrealized Losses	(18,328,000)		(3,257,000)
Cost or Amortized Cost	555,422,000		519,955,000
OTTI Unrealized Losses	0	[1]	0	[1]
Short-term investments
Available for sale securities:
Estimated Fair Value	1,094,129,000		730,369,000
Gross Unrealized Gains	174,000		3,521,000
Gross Unrealized Losses	(4,650,000)		(1,248,000)
Cost or Amortized Cost	1,098,605,000		728,096,000
OTTI Unrealized Losses	$ 0	[1]	$ 0	[1]

[1] Represents the total other-than-temporary impairments (“OTTI”) recognized in accumulated other comprehensive income (“AOCI”). It does not include the change in fair value subsequent to the impairment measurement date. At June 30, 2013, the net unrealized gain related to securities for which a non-credit OTTI was recognized in AOCI was $4.2 million, compared to a net unrealized gain of $2.0 million at December 31, 2012.

[2] In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged. See “—Securities Lending Agreements.”

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Legal Proceedings

6 Months Ended

Jun. 30, 2013

Disclosure Legal Proceedings [Abstract]

Legal Proceedings

Legal Proceedings

The Company, in common with the insurance industry in general, is subject to litigation and arbitration in the normal course of its business. As of June 30, 2013, the Company was not a party to any litigation or arbitration which is expected by management to have a material adverse effect on the Company’s results of operations and financial condition and liquidity.

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Fair Value

6 Months Ended

Jun. 30, 2013

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

Accounting guidance regarding fair value measurements addresses how companies should measure fair value when they are required to use a fair value measure for recognition or disclosure purposes under GAAP and provides a common definition of fair value to be used throughout GAAP. It defines fair value as the price that would be received to sell an asset or paid to transfer a liability in an orderly fashion between market participants at the measurement date. In addition, it establishes a three-level valuation hierarchy for the disclosure of fair value measurements. The valuation hierarchy is based upon the transparency of inputs to the valuation of an asset or liability as of the measurement date. The level in the hierarchy within which a given fair value measurement falls is determined based on the lowest level input that is significant to the measurement (Level 1 being the highest priority and Level 3 being the lowest priority).

The levels in the hierarchy are defined as follows:

Level 1: Inputs to the valuation methodology are observable inputs that reflect quoted prices (unadjusted) for identical assets or liabilities in active markets

Level 2: Inputs to the valuation methodology include quoted prices for similar assets and liabilities in active markets, and inputs that are observable for the asset or liability, either directly or indirectly, for substantially the full term of the financial instrument

Level 3: Inputs to the valuation methodology are unobservable and significant to the fair value measurement

Following is a description of the valuation methodologies used for securities measured at fair value, as well as the general classification of such securities pursuant to the valuation hierarchy.

The Company determines the existence of an active market based on its judgment as to whether transactions for the financial instrument occur in such market with sufficient frequency and volume to provide reliable pricing information. The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. The Company uses quoted values and other data provided by nationally recognized independent pricing sources as inputs into its process for determining fair values of its fixed maturity investments. To validate the techniques or models used by pricing sources, the Company's review process includes, but is not limited to: (i) quantitative analysis (e.g., comparing the quarterly return for each managed portfolio to its target benchmark, with significant differences identified and investigated); (ii) a review of the average number of prices obtained in the pricing process and the range of resulting fair values; (iii) initial and ongoing evaluation of methodologies used by outside parties to calculate fair value including a review of deep dive reports on selected securities which indicate the use of observable inputs in the pricing process; (iv) comparing the fair value estimates to its knowledge of the current market; (v) a comparison of the pricing services' fair values to other pricing services' fair values for the same investments; and (vi) back-testing, which includes randomly selecting purchased or sold securities and comparing the executed prices to the fair value estimates from the pricing service. For a majority of investments, the Company obtained multiple quotes. A price source hierarchy was maintained in order to determine which price source would be used (i.e., a price obtained from a pricing service with more seniority in the hierarchy will be used over a less senior one in all cases). The hierarchy prioritizes pricing services based on availability and reliability and assigns the highest priority to index providers. Based on the above review, the Company will challenge any prices for a security or portfolio which are considered not to be representative of fair value. At June 30, 2013, the Company adjusted certain prices (primarily on structured securities) obtained from the pricing services and substituted alternate prices (primarily broker-dealer quotes) for such securities. Such adjustments did not have a material impact on the overall fair value of the Company's investment portfolio at June 30, 2013.

The independent pricing sources obtain market quotations and actual transaction prices for securities that have quoted prices in active markets. Each source has its own proprietary method for determining the fair value of securities that are not actively traded. In general, these methods involve the use of “matrix pricing” in which the independent pricing source uses observable market inputs including, but not limited to, investment yields, credit risks and spreads, benchmarking of like securities, broker-dealer quotes, reported trades and sector groupings to determine a reasonable fair value. In addition, pricing vendors use model processes, such as an Option Adjusted Spread model, to develop prepayment and interest rate scenarios. The Option Adjusted Spread model is commonly used to estimate fair value for securities such as mortgage backed and asset backed securities. In certain circumstances, when fair values are unavailable from these independent pricing sources, quotes are obtained directly from broker-dealers who are active in the corresponding markets. Such quotes are subject to the validation procedures noted above. Of the $12.78 billion of financial assets and liabilities measured at fair value at June 30, 2013, approximately $1.45 billion, or 11.4%, were priced using non-binding broker-dealer quotes. Of the $12.40 billion of financial assets and liabilities measured at fair value at December 31, 2012, approximately $927.9 million, or 7.5%, were priced using non-binding broker-dealer quotes.

The Company reviews its securities measured at fair value and discusses the proper classification of such investments with investment advisors and others. A discussion of the general classification of the Company's financial instruments follows:

Fixed maturities. The Company determined that all U.S. Treasuries would be classified as Level 1 securities due to observed levels of trading activity, the high number of strongly correlated pricing quotes received on U.S. Treasuries and other factors. Where the Company believes that quoted market prices are not available or that the market is not active, fair values are estimated by using quoted prices of securities with similar characteristics, pricing models or matrix pricing and are generally classified as Level 2 securities. The Company determined that Level 2 securities included corporate bonds, mortgage backed securities, municipal bonds, asset backed securities and non-U.S. government securities. The Company determined that certain Euro-denominated corporate bonds which invest in underlying portfolios of fixed income securities for which there is a low level of transparency around inputs to the valuation process should be classified within Level 3 of the valuation hierarchy and certain other corporate bonds.

Equity securities. The Company determined that exchange-traded equity securities would be included in Level 1 as their fair values are based on quoted market prices in active markets. Other equity securities are included in Level 2 of the valuation hierarchy.

Other investments. The fair values for certain of the Company's other investments are determined using net asset values (“NAV”) as advised by external fund managers. The NAV is based on the fund manager's valuation of the underlying holdings in accordance with the fund's governing documents. Periodically, the Company performs a number of monitoring procedures in order to assess the quality of the NAVs, including regular review and discussion of each fund's performance, regular evaluation of fund performance against applicable benchmarks and the backtesting of the NAVs against audited and interim financial statements. Other investments with liquidity terms allowing the Company to substantially redeem its holdings in a short time frame at the applicable NAV are reflected in Level 2. Other investments with redemption restrictions that prevent the Company from redeeming in the near term are classified in Level 3 of the valuation hierarchy.

Short-term investments. The Company determined that certain of its short-term investments held in highly liquid money market-type funds would be included in Level 1 as their fair values are based on quoted market prices in active markets. Other short-term investments are classified in Level 2 of the valuation hierarchy.

The Company reviews the classification of its investments each quarter. No transfers were made in the periods presented.

In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged under securities lending agreements. For purposes of the following tables, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged under securities lending agreements, at fair value.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at June 30, 2013:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,473,130	$	—	$	2,470,770	$	2,360
Mortgage backed securities	1,592,207		—		1,592,207		—
Municipal bonds	1,507,924		—		1,507,924		—
Commercial mortgage backed securities	838,471		—		838,471		—
U.S. government and government agencies	975,345		975,345		—		—
Non-U.S. government securities	1,002,989		—		1,002,989		—
Asset backed securities	1,225,183		—		1,225,183		—
Total	9,615,249		975,345		8,637,544		2,360
Equity securities	438,038		437,278		760		—
Other investments	569,407		—		379,514		189,893
Short-term investments	1,094,129		1,062,472		31,657		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	293,976		—		293,976		—
Non-U.S. government bonds	59,334		—		59,334		—
Other investments	712,374		—		422,185		290,189
Equity securities	—		—		—		—
Total	1,065,684		—		775,495		290,189
Total assets measured at fair value	$	12,782,507	$	2,475,095	$	9,824,970	$	482,442
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	—	$	—	$	—	$	—
Total liabilities measured at fair value	$	—	$	—	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

The following table presents the Company’s financial assets and liabilities measured at fair value by level at December 31, 2012:

			Fair Value Measurement Using:
	Fair Value		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Assets measured at fair value:
Available for sale securities:
Fixed maturities and fixed maturities pledged under securities lending agreements (1):
Corporate bonds	$	2,857,513	$	—	$	2,759,109	$	98,404
Mortgage backed securities	1,532,736		—		1,532,736		—
Municipal bonds	1,463,586		—		1,463,586		—
Commercial mortgage backed securities	824,165		—		824,165		—
U.S. government and government agencies	1,131,688		1,131,688		—		—
Non-U.S. government securities	998,901		—		998,901		—
Asset backed securities	1,073,999		—		1,073,999		—
Total	9,882,588		1,131,688		8,652,496		98,404
Equity securities	312,749		312,666		83		—
Other investments	549,280		—		365,078		184,202
Short-term investments	730,369		678,441		51,928		—
Fair value option:
Investments accounted for using the fair value option:
Corporate bonds	275,132		—		275,132		—
Non-U.S. government bonds	88,409		—		88,409		—
Other investments	527,971		—		332,621		195,350
Equity securities	25,954		25,954		—		—
Total	917,466		25,954		696,162		195,350
Total assets measured at fair value	$	12,392,452	$	2,148,749	$	9,765,747	$	477,956
Liabilities measured at fair value:
Fair value option:
Securities sold but not yet purchased (2)	$	6,924	$	6,924	$	—	$	—
Total liabilities measured at fair value	$	6,924	$	6,924	$	—	$	—

_________________________________________________

(1) In securities lending transactions, the Company receives collateral in excess of the fair value of the fixed maturities and short-term investments pledged. For purposes of this table, the Company has excluded the collateral received and reinvested and included the fixed maturities and short-term investments pledged.

(2) Represents the Company’s obligation to deliver securities that it did not own at the time of sale. Such amounts are included in “other liabilities” on the Company’s consolidated balance sheets.

The following tables present a reconciliation of the beginning and ending balances for all investments measured at fair value on a recurring basis using Level 3 inputs:

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale					Fair Value Option
	Corporate Bonds			Other Investments		Other Investments			Total
Three Months Ended June 30, 2013
Balance at beginning of period	$	97,298		$	185,934	$	179,370		$	462,602
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	3,187			—		(2,075		)	1,112
Included in other comprehensive income	(1,363		)	3,959		—			2,596
Purchases, issuances, sales and settlements
Purchases	—			—		118,916			118,916
Issuances	—			—		—			—
Sales	(96,655		)	—		—			(96,655		)
Settlements	(107		)	—		(6,022		)	(6,129		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	2,360		$	189,893	$	290,189		$	482,442
Three Months Ended June 30, 2012
Balance at beginning of period	$	96,655		$	6,215	$	—		$	102,870
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	(548		)	—		—			(548		)
Included in other comprehensive income	(4,032		)	171		—			(3,861		)
Purchases, issuances, sales and settlements
Purchases	—			—		—			—
Issuances	—			—		—			—
Sales	—			—		—			—
Settlements	(39		)	—		—			(39		)
Transfers in and/or out of Level 3	—			—		—			—
Balance at end of period	$	92,036		$	6,386	$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

	Fair Value Measurements Using: Significant Unobservable Inputs (Level 3)
s	Available-For-Sale						Fair Value Option
	Corporate Bonds			Other Investments			Other Investments			Total
Six Months Ended June 30, 2013
Balance at beginning of period	$	98,404		$	184,202		$	195,350		$	477,956
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	4,679			4,762			(1,702		)	7,739
Included in other comprehensive income	(3,051		)	5,871			—			2,820
Purchases, issuances, sales and settlements
Purchases	—			5,000			160,570			165,570
Issuances	—			—			—			—
Sales	(96,655		)	—			—			(96,655		)
Settlements	(1,017		)	(9,942		)	(64,029		)	(74,988		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	2,360		$	189,893		$	290,189		$	482,442
Six Months Ended June 30, 2012
Balance at beginning of period	$	92,091		$	5,124		$	—		$	97,215
Total gains or (losses) (realized/unrealized)
Included in earnings (1)	1,783			81			—			1,864
Included in other comprehensive income	(1,759		)	1,262			—			(497		)
Purchases, issuances, sales and settlements
Purchases	—			—			—			—
Issuances	—			—			—			—
Sales	—			—			—			—
Settlements	(79		)	(81		)	—			(160		)
Transfers in and/or out of Level 3	—			—			—			—
Balance at end of period	$	92,036		$	6,386		$	—		$	98,422

_________________________________________________

(1) Gains or losses on corporate bonds were included in net realized gains (losses) while gains or losses on other investments were recorded in net realized gains (losses) or net investment income.

The amount of total losses for the 2013 second quarter included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013 was $2.2 million, while the amount of total gains for the six months ended June 30, 2013 included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2013 was $4.4 million. The amount of total losses for the 2012 second quarter included in earnings attributable to the change in unrealized gains or losses relating to assets still held at June 30, 2012 was $0.5 million, while the amount of total gains for the six months ended June 30, 2012 was $1.9 million.

Financial Instruments Disclosed, But Not Carried, At Fair Value

The Company uses various financial instruments in the normal course of its business. The carrying values of cash, accrued investment income, receivable for securities sold, certain other assets, payable for securities purchased and certain other liabilities approximated their fair values at June 30, 2013, due to their respective short maturities. As these financial instruments are not actively traded, their respective fair values are classified within Level 2.

At June 30, 2013, the Company’s senior notes were carried at their cost of $300.0 million and had a fair value of $368.8 million. The fair values of these securities were obtained from a third party pricing service and are based on observable market inputs. As such, the fair values of the senior notes are classified within Level 2.

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Segment Information (Tables)

6 Months Ended

Jun. 30, 2013

Segment Reporting [Abstract]

Analysis of underwriting income by segment and reconciliation to net income available to common shareholders

The following tables summarize the Company’s underwriting income or loss by segment, together with a reconciliation of underwriting income or loss to net income available to common shareholders:

	Three Months Ended									Three Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	703,904		$	337,642		$	1,040,738		$	676,090		$	376,981		$	1,051,813
Net premiums written	501,568			308,967			810,535			464,584			355,649			820,233
Net premiums earned	$	458,656		$	300,160		$	758,816		$	446,594		$	280,062		$	726,656
Fee income	529			373			902			628			178			806
Losses and loss adjustment expenses	(291,192		)	(127,461		)	(418,653		)	(290,416		)	(109,277		)	(399,693		)
Acquisition expenses, net	(74,249		)	(57,428		)	(131,677		)	(76,058		)	(52,231		)	(128,289		)
Other operating expenses	(80,167		)	(33,192		)	(113,359		)	(76,617		)	(29,140		)	(105,757		)
Underwriting income	$	13,577		$	82,452		96,029			$	4,131		$	89,592		93,723
Net investment income							68,369									73,608
Net realized gains							12,652									34,867
Net impairment losses recognized in earnings							(724		)							(1,951		)
Equity in net income of investment funds accounted for using the equity method							10,941									7,787
Other income (loss)							834									695
Other expenses							(14,049		)							(11,944		)
Interest expense							(5,852		)							(7,439		)
Net foreign exchange gains							13,811									31,689
Income before income taxes							182,011									221,035
Income tax expense							(5,071		)							(767		)
Net income							176,940									220,268
Preferred dividends							(5,485		)							(7,649		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	171,455								$	202,007
Underwriting Ratios
Loss ratio	63.5		%	42.5		%	55.2		%	65.0		%	39.0		%	55.0		%
Acquisition expense ratio (2)	16.1		%	19.1		%	17.3		%	16.9		%	18.6		%	17.6		%
Other operating expense ratio	17.5		%	11.1		%	14.9		%	17.2		%	10.4		%	14.6		%
Combined ratio	97.1		%	72.7		%	87.4		%	99.1		%	68.0		%	87.2		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

	Six Months Ended									Six Months Ended
	June 30, 2013									June 30, 2012
	Insurance			Reinsurance			Total			Insurance			Reinsurance			Total
Gross premiums written (1)	$	1,392,721		$	813,847		$	2,204,437		$	1,364,203		$	756,957		$	2,118,469
Net premiums written	1,006,118			757,193			1,763,311			955,264			728,580			1,683,844
Net premiums earned	$	903,621		$	607,965		$	1,511,586		$	888,334		$	518,634		$	1,406,968
Fee income	1,054			386			1,440			1,158			191			1,349
Losses and loss adjustment expenses	(574,659		)	(243,397		)	(818,056		)	(593,580		)	(201,320		)	(794,900		)
Acquisition expenses, net	(145,007		)	(114,262		)	(259,269		)	(149,928		)	(97,323		)	(247,251		)
Other operating expenses	(156,482		)	(66,792		)	(223,274		)	(149,987		)	(55,263		)	(205,250		)
Underwriting income (loss)	$	28,527		$	183,900		212,427			$	(4,003	)	$	164,919		160,916
Net investment income							134,041									147,905
Net realized gains							70,992									78,988
Net impairment losses recognized in earnings							(2,970		)							(2,974		)
Equity in net income of investment funds accounted for using the equity method							24,764									32,613
Other income (loss)							2,078									(7,373		)
Other expenses							(24,317		)							(18,923		)
Interest expense							(11,750		)							(14,960		)
Net foreign exchange gains							38,075									11,001
Income before income taxes							443,340									387,193
Income tax expense							(9,924		)							(2,669		)
Net income							433,416									384,524
Preferred dividends							(10,969		)							(14,110		)
Loss on repurchase of preferred shares							—									(10,612		)
Net income available to common shareholders							$	422,447								$	359,802
Underwriting Ratios
Loss ratio	63.6		%	40.0		%	54.1		%	66.8		%	38.8		%	56.5		%
Acquisition expense ratio (2)	15.9		%	18.8		%	17.1		%	16.7		%	18.8		%	17.5		%
Other operating expense ratio	17.3		%	11.0		%	14.8		%	16.9		%	10.7		%	14.6		%
Combined ratio	96.8		%	69.8		%	86.0		%	100.4		%	68.3		%	88.6		%

_________________________________________________

(1)     Certain amounts included in the gross premiums written of each segment are related to intersegment transactions. Accordingly, the sum of gross premiums written for each segment does not agree to the total gross premiums written as shown in the table above due to the elimination of intersegment transactions in the total.

(2)     The acquisition expense ratio is adjusted to include policy-related fee income.

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Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2013

Accounting Policies [Abstract]

Basis of Accounting, Policy

The interim consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“GAAP”) and include the accounts of ACGL and its wholly owned subsidiaries (together with ACGL, the “Company”). All significant intercompany transactions and balances have been eliminated in consolidation.

Use of Estimates, Policy

The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates and assumptions. In the opinion of management, the accompanying unaudited interim consolidated financial statements reflect all adjustments (consisting of normally recurring accruals) necessary for a fair statement of results on an interim basis. The results of any interim period are not necessarily indicative of the results for a full year or any future periods.

XML

Document and Entity Information Document and Entity Information	6 Months Ended
	Jun. 30, 2013	Aug. 02, 2013
Document and Entity Information [Abstract]
Entity Registrant Name	ARCH CAPITAL GROUP LTD.
Entity Central Index Key	0000947484
Current Fiscal Year End Date	--12-31
Entity Filer Category	Accelerated Filer
Document Type	10-Q
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	Q2
Amendment Flag	false
Entity Common Stock, Shares Outstanding		133,420,370

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Earnings Per Common Share (Tables)

6 Months Ended

Jun. 30, 2013

Earnings Per Share [Abstract]

Schedule of computation of basic and diluted earnings per common share

The following table sets forth the computation of basic and diluted earnings per common share:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2013			2012			2013			2012
Numerator:
Net income	$	176,940		$	220,268		$	433,416		$	384,524
Preferred dividends	(5,485		)	(7,649		)	(10,969		)	(14,110		)
Loss on repurchase of preferred shares	—			(10,612		)	—			(10,612		)
Net income available to common shareholders	$	171,455		$	202,007		$	422,447		$	359,802
Denominator:
Weighted average common shares outstanding — basic	131,377,274			134,529,129			131,143,885			134,241,876
Effect of dilutive common share equivalents:
Nonvested restricted shares	1,088,030			800,455			1,181,947			909,524
Stock options (1)	3,383,746			2,882,152			3,298,394			2,866,090
Weighted average common shares and common share equivalents outstanding — diluted	135,849,050			138,211,736			135,624,226			138,017,490
Earnings per common share:
Basic	$	1.31		$	1.50		$	3.22		$	2.68
Diluted	$	1.26		$	1.46		$	3.11		$	2.61

_________________________________________________

(1) Certain stock options were not included in the computation of diluted earnings per share where the exercise price of the stock options exceeded the average market price and would have been anti-dilutive or where, when applying the treasury stock method to in-the-money options, the sum of the proceeds, including unrecognized compensation, exceeded the average market price and would have been anti-dilutive. For the 2013 second quarter and 2012 second quarter, the number of stock options excluded were 1,428,616 and 912,056, respectively. For the six months ended June 30, 2013 and 2012, the number of stock options excluded were 1,730,313 and 688,634, respectively.