10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x	QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the quarterly period ended June 30, 2012
	OR
o	TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934
	For the transition period from __________ to __________

Commission File Number: 001-31341

Platinum Underwriters Holdings, Ltd.

(Exact name of registrant as specified in its charter)

Bermuda	98-0416483
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)

The Belvedere Building 69 Pitts Bay Road Pembroke, Bermuda	HM 08
(Address of principal executive offices)	(Zip Code)

(441) 295-7195

(Registrant's telephone number, including area code)

Not Applicable

(Former name, former address and former fiscal year, if changed since last report)

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
Non-accelerated filer		(Do not check if a smaller reporting company)	Smaller reporting company

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

     Yes ___     No  X 

The registrant had 33,212,487 common shares, par value $0.01 per share, outstanding as of July 19, 2012.

PLATINUM UNDERWRITERS HOLDINGS, LTD.

QUARTERLY REPORT ON FORM 10-Q FOR THE QUARTER ENDED JUNE 30, 2012

TABLE OF CONTENTS

		Page
PART I  –  FINANCIAL INFORMATION
Item 1.	Financial Statements
	Consolidated Balance Sheets as of June 30, 2012 (Unaudited) and December 31, 2011	1
	Consolidated Statements of Operations for the Three and Six Months Ended June 30, 2012 and 2011 (Unaudited)	2
	Consolidated Statements of Comprehensive Income (Loss) for the Three and Six Months Ended June 30, 2012 and 2011 (Unaudited)		3
	Consolidated Statements of Shareholders’ Equity for the Six Months Ended June 30, 2012 and 2011 (Unaudited)		4
	Consolidated Statements of Cash Flows for the Six Months Ended June 30, 2012 and 2011 (Unaudited)		5
	Notes to Consolidated Financial Statements for the Three and Six Months Ended June 30, 2012 and 2011 (Unaudited)		6
Item 2.	Management's Discussion and Analysis of Financial Condition and Results of Operations		23
Item 3.	Quantitative and Qualitative Disclosures about Market Risk		41
Item 4.	Controls and Procedures		42
PART II  –  OTHER INFORMATION
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		42
Item 6.	Exhibits		42
SIGNATURES			43

PART I - FINANCIAL INFORMATION

ITEM 1. FINANCIAL STATEMENTS

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Consolidated Balance Sheets

June 30, 2012 and December 31, 2011

($ in thousands, except share data)

	(Unaudited)
	June 30,		December 31,
	2012		2011
ASSETS
Investments:
Fixed maturity available-for-sale securities at fair value	$	2,309,987	$	2,663,574
(amortized cost - $2,137,666 and $2,494,710, respectively)
Fixed maturity trading securities at fair value		113,847		125,126
(amortized cost - $104,450 and $115,156, respectively)
Short-term investments		167,778		588,834
Total investments		2,591,612		3,377,534
Cash and cash equivalents		1,465,983		792,510
Accrued investment income		24,541		29,440
Reinsurance premiums receivable		145,132		159,387
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses		4,222		6,302
Prepaid reinsurance premiums		316		8,360
Funds held by ceding companies		111,408		94,546
Deferred acquisition costs		27,620		28,779
Deferred tax assets		25,038		31,613
Other assets		29,065		23,140
Total assets	$	4,424,937	$	4,551,611
LIABILITIES AND SHAREHOLDERS’ EQUITY
Liabilities
Unpaid losses and loss adjustment expenses	$	2,229,603	$	2,389,614
Unearned premiums		114,759		121,164
Debt obligations		250,000		250,000
Commissions payable		64,304		62,773
Other liabilities		44,444		37,201
Total liabilities	$	2,703,110	$	2,860,752
Shareholders’ Equity
Common shares, $0.01 par value, 200,000,000 shares authorized,	$	332	$	355
33,212,487 and 35,526,400 shares issued and outstanding, respectively
Additional paid-in capital		227,482		313,730
Accumulated other comprehensive income		148,562		146,635
Retained earnings		1,345,451		1,230,139
Total shareholders' equity	$	1,721,827	$	1,690,859
Total liabilities and shareholders' equity	$	4,424,937	$	4,551,611

See accompanying notes to consolidated financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Consolidated Statements of Operations (Unaudited)

For the Three and Six Months Ended June 30, 2012 and 2011

($ in thousands, except per share data)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Revenue:
Net premiums earned	$	145,075		$	172,436		$	283,287		$	355,317
Net investment income		26,155			33,965			54,707			66,343
Net realized gains (losses) on investments		24,978			(4,689	)		47,317			(4,282	)
Total other-than-temporary impairments		(335	)		(548	)		(91	)		500
Portion of impairment losses recognized in accumulated other comprehensive income		(778	)		(1,118	)		(2,092	)		(3,673	)
Net impairment losses on investments		(1,113	)		(1,666	)		(2,183	)		(3,173	)
Other income (expense)		(191	)		(60	)		(670	)		1,036
Total revenue		194,904			199,986			382,458			415,241
Expenses:
Net losses and loss adjustment expenses		67,117			159,357			146,313			478,952
Net acquisition expenses		30,200			34,115			60,857			68,065
Net changes in fair value of derivatives		-			4,474			-			748
Operating expenses		19,696			17,105			36,679			34,256
Net foreign currency exchange losses (gains)		(310	)		614			222			803
Interest expense		4,774			4,767			9,546			9,533
Total expenses		121,477			220,432			253,617			592,357
Income (loss) before income taxes		73,427			(20,446	)		128,841			(177,116	)
Income tax expense (benefit)		5,895			(45	)		8,022			477
Net income (loss)	$	67,532		$	(20,401	)	$	120,819		$	(177,593	)
Earnings (loss) per common share:
Basic earnings (loss) per common share	$	1.98		$	(0.55	)	$	3.48		$	(4.75	)
Diluted earnings (loss) per common share	$	1.97		$	(0.55	)	$	3.46		$	(4.75	)
Shareholder dividends:
Common shareholder dividends declared	$	2,667		$	2,969		$	5,507		$	5,933
Dividends declared per common share	$	0.08		$	0.08		$	0.16		$	0.16

See accompanying notes to consolidated financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Consolidated Statements of Comprehensive Income (Loss) (Unaudited)

For the Three and Six Months Ended June 30, 2012 and 2011

($ in thousands)

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Net income (loss)	$	67,532		$	(20,401	)	$	120,819		$	(177,593	)
Other comprehensive income, before deferred tax:
Net change in unrealized gains and losses on available-for-sale securities arising during the period		33,945			55,984			49,002			70,753
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments		(25,219	)		6,744			(47,897	)		3,036
Net impairment losses on investments		1,113			1,666			2,183			3,173
Other comprehensive income, before deferred tax		9,839			64,394			3,288			76,962
Deferred tax on components of other comprehensive income:
Net change in unrealized gains and losses on available-for-sale securities arising during the period		(2,823	)		(9,680	)		(2,883	)		(10,443	)
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments		1,194			(2,162	)		1,754			(1,918	)
Net impairment losses on investments		(106	)		(34	)		(232	)		(79	)
Deferred income tax expense		(1,735	)		(11,876	)		(1,361	)		(12,440	)
Other comprehensive income, net of deferred tax:
Net change in unrealized gains and losses on available-for-sale securities arising during the period		31,122			46,304			46,119			60,310
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments		(24,025	)		4,582			(46,143	)		1,118
Net impairment losses on investments		1,007			1,632			1,951			3,094
Other comprehensive income, net of deferred tax		8,104			52,518			1,927			64,522
Comprehensive income (loss)	$	75,636		$	32,117		$	122,746		$	(113,071	)

See accompanying notes to consolidated financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Consolidated Statements of Shareholders’ Equity (Unaudited)

For the Six Months Ended June 30, 2012 and 2011

($ in thousands)

	2012			2011
Common shares:
Balances at beginning of period	$	355		$	377
Exercise of common share options		-			-
Issuance of common shares		-			-
Settlement of equity awards		2			4
Repurchase of common shares		(25	)		(8	)
Balances at end of period		332			373
Additional paid-in capital:
Balances at beginning of period		313,730			453,619
Exercise of common share options		1,014			1,132
Issuance of common shares		-			2
Settlement of equity awards		(1,109	)		(2,726	)
Repurchase of common shares		(89,910	)		(33,899	)
Purchase of common share options		-			(47,900	)
Share based compensation		3,694			2,275
Income tax benefit from share based compensation		63			379
Balances at end of period		227,482			372,882
Accumulated other comprehensive income (loss):
Balances at beginning of period		146,635			(24,488	)
Net change in unrealized gains and losses on available-for-sale securities, net of deferred taxes:
Change in unrealized gains and losses		7			60,987
Non-credit component of impairment losses		1,920			3,535
Balances at end of period		148,562			40,034
Retained earnings:
Balances at beginning of period		1,230,139			1,465,947
Net income (loss)		120,819			(177,593	)
Common share dividends		(5,507	)		(5,933	)
Balances at end of period		1,345,451			1,282,421
Total shareholders' equity	$	1,721,827		$	1,695,710

See accompanying notes to consolidated financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Consolidated Statements of Cash Flows (Unaudited)

For the Six Months Ended June 30, 2012 and 2011

($ in thousands)

	2012			2011
Operating Activities:
Net income (loss)	$	120,819		$	(177,593	)
Adjustments to reconcile net income (loss) to cash provided by (used in) operations:
Depreciation and amortization		2,518			1,829
Net realized (gains) losses on investments		(47,317	)		4,282
Net impairment losses on investments		2,183			3,173
Net foreign currency exchange losses		222			803
Share-based compensation		4,046			2,275
Deferred income tax expense		5,215			759
Net fixed maturity trading securities activities		9,877			142
Changes in assets and liabilities:
Decrease (increase) in accrued investment income		4,817			(276	)
Decrease in reinsurance premiums receivable		13,778			15,896
Increase in funds held by ceding companies		(17,140	)		(5,946	)
Decrease in deferred acquisition costs		1,134			4,560
Increase (decrease) in net unpaid and paid losses and loss adjustment expenses		(158,720	)		194,976
Increase (decrease) in net unearned premiums		1,833			(34,645	)
Increase (decrease) in commissions payable		1,624			(5,531	)
Changes in other assets and liabilities		(4,074	)		28,584
Net cash provided by (used in) operating activities		(59,185	)		33,288
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		395,269			353,402
Proceeds from sale of fixed maturity trading securities		-			20,413
Proceeds from sale of short-term investments		20,597			27,995
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		179,768			72,694
Proceeds from maturity of short-term investments		577,296			140,014
Acquisition of fixed maturity available-for-sale securities		(172,110	)		(34,499	)
Acquisition of short-term investments		(168,542	)		(211,527	)
Net cash provided by (used in) investing activities		832,278			368,492
Financing Activities:
Dividends paid to common shareholders		(5,507	)		(5,933	)
Repurchase of common shares		(89,935	)		(33,907	)
Purchase of common share options		-			(47,900	)
Proceeds from exercise of common share options		1,014			1,132
Net cash provided by (used in) financing activities		(94,428	)		(86,608	)
Effect of foreign currency exchange rate changes on cash		(5,192	)		15,724
Net increase (decrease) in cash and cash equivalents		673,473			330,896
Cash and cash equivalents at beginning of period		792,510			987,877
Cash and cash equivalents at end of period	$	1,465,983		$	1,318,773
Supplemental disclosures of cash flow information:
Income taxes paid	$	9,012		$	417
Interest paid	$	9,375		$	9,375

See accompanying notes to consolidated financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited)

For the Three and Six Months Ended June 30, 2012 and 2011

1. Basis of Presentation and Significant Accounting Policies

Basis of Presentation and Consolidation

Platinum Underwriters Holdings, Ltd. (“Platinum Holdings”) is a holding company domiciled in Bermuda.  Through our reinsurance subsidiaries, we provide property and marine, casualty and finite risk reinsurance coverages to a diverse clientele of insurers and select reinsurers on a worldwide basis.

Platinum Holdings and its consolidated subsidiaries (collectively, the “Company”) include Platinum Holdings, Platinum Underwriters Bermuda, Ltd. (“Platinum Bermuda”), Platinum Underwriters Reinsurance, Inc. (“Platinum US”), Platinum Underwriters Finance, Inc. (“Platinum Finance”), Platinum Regency Holdings (“Platinum Regency”) and Platinum Administrative Services, Inc.  The terms “we,” “us,” and “our” refer to the Company, unless the context otherwise indicates.

Platinum Regency is an intermediate holding company based in Ireland and a wholly owned subsidiary of Platinum Holdings.  Platinum Finance is an intermediate holding company based in the U.S. and a wholly owned subsidiary of Platinum Regency.  We operate through two licensed reinsurance subsidiaries, Platinum Bermuda, a Bermuda reinsurance company, and Platinum US, a U.S. reinsurance company.   Platinum Bermuda is a wholly owned subsidiary of Platinum Holdings and Platinum US is a wholly owned subsidiary of Platinum Finance.  Platinum Administrative Services, Inc. is a subsidiary that provides administrative support services to the Company.

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America (“U.S. GAAP”) for interim financial information.  Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements.  All material inter-company transactions and accounts have been eliminated in preparing these consolidated financial statements.  The consolidated financial statements included in this report as of  June 30, 2012 and for the three and six months ended June 30, 2012 and 2011 are unaudited and include all adjustments consisting of normal recurring items that management considers necessary for a fair presentation under U.S. GAAP.  These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2011.

The preparation of financial statements requires us 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 may differ materially from these estimates.  The major estimates used in the preparation of the Company's consolidated financial statements, and therefore considered to be critical accounting estimates, include, but are not limited to, premiums written and earned, unpaid losses and loss adjustment expenses (“LAE”), reinsurance recoverable, valuation of investments and income taxes.  In addition, estimates are used to evaluate risk transfer for assumed and ceded reinsurance transactions.  Results of changes in estimates are reflected in results of operations in the period in which the change is made.  The results of operations for any interim period are not necessarily indicative of results for the full year.

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update (“ASU”) No. 2011-12, “Comprehensive Income: Deferral of the Effective Date for Amendments to the Presentation of Reclassification of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05” (“ASU 2011-12”).  ASU 2011-12 defers the presentation on the face of the financial statements of the effects of reclassifications of the components of net income and other comprehensive income out of accumulated other comprehensive income for all periods.  None of the other requirements of ASU 2011-05, “Presentation of Comprehensive Income” (“ASU 2011-05”) issued in June 2011 are affected by ASU 2011-12.  ASU 2011-05 requires entities to report components of comprehensive income in either a continuous statement of comprehensive income or two separate but consecutive statements.  Under the continuous statement approach, the statement would include the components and total of net income, the components and total of other comprehensive income and the total of comprehensive income.  Under the two statement approach, the first statement would include the components and total of net income and the second statement would include the components and total of other comprehensive income and the total of comprehensive income.  ASU 2011-05 does not change the items that must be reported in other comprehensive income.  ASU 2011-05 is effective retrospectively for interim and annual periods beginning after December 15, 2011, with early adoption permitted.  We adopted the guidance as of January 1, 2012 and included a separate statement of comprehensive income (loss) in our financial statements.  The separate statement of comprehensive income (loss) incorporated the effects of reclassification adjustments recognized in our statement of operations.

In May 2011, the FASB issued ASU No. 2011-04, “Amendments to Achieve Common Fair Value Measurement and Disclosure Requirement in U.S. GAAP and IFRSs” (“ASU 2011-04”).  ASU 2011-04 does not extend the use of fair value but, rather, provides guidance about how fair value should be applied where it already is required and permitted under U.S. GAAP or International Financial Reporting Standards (“IFRS”).  For U.S. GAAP, most of the changes are clarifications of existing guidance or wording changes to align with IFRS.   ASU 2011-04 is effective on a prospective basis for interim and annual periods beginning after December 15, 2011, with early adoption not permitted.  In the period of adoption, a reporting entity is required to disclose a change, if any, in valuation technique and related inputs that result from applying ASU 2011-04 and to quantify the total effect, if practicable.  We adopted the guidance as of January 1, 2012 and there were no changes in valuation technique or inputs. Additional disclosures required under ASU 2011-04 have been reflected in Note 3.

In October 2010, the FASB issued ASU No. 2010-26, “Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts” (“ASU 2010-26”).  ASU 2010-26 modifies the types of costs that may be deferred, allowing insurance companies to only defer costs directly related to successful acquisition of new or renewal contracts.  These costs include incremental direct costs of successful contracts, the portion of employees’ salaries and benefits related to time spent on acquisition activities for successful contracts and other costs incurred in the acquisition of contracts.  Additional disclosure of the type of acquisition costs capitalized is also required.  ASU 2010-26 is effective on a prospective basis for interim and annual reporting periods beginning after December 15, 2011, with early adoption permitted as of the beginning of a company’s annual period.  We adopted the guidance as of January 1, 2012 and there was no impact on our financial statements.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

2. Investments

Fixed Maturity Available-for-sale Securities

The following table sets forth our fixed maturity available-for-sale securities as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Included in Accumulated Other Comprehensive Income
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Non-credit portion of OTTI(1)
June 30, 2012:
U.S. Government	$	4,667	$	344	$	-	$	5,011	$	-
U.S. Government agencies		10,003		161		-		10,164		-
Municipal bonds		1,204,826		148,029		18		1,352,837		-
Non-U.S. governments		92,948		1,532		185		94,295		-
Corporate bonds		330,863		20,255		716		350,402		-
Commercial mortgage-backed securities		188,789		13,941		1,374		201,356		171
Residential mortgage-backed securities		283,247		2,355		9,320		276,282		6,068
Asset-backed securities		22,323		775		3,458		19,640		3,096
Total fixed maturity available-for-sale securities	$	2,137,666	$	187,392	$	15,071	$	2,309,987	$	9,335
December 31, 2011:
U.S. Government	$	4,702	$	381	$	-	$	5,083	$	-
U.S. Government agencies		100,000		259		-		100,259		-
Municipal bonds		1,510,658		150,280		178		1,660,760		-
Non-U.S. governments		69,992		1,929		655		71,266		-
Corporate bonds		329,218		21,093		763		349,548		-
Commercial mortgage-backed securities		195,309		11,884		2,584		204,609		196
Residential mortgage-backed securities		261,187		2,866		12,426		251,627		8,397
Asset-backed securities		23,644		489		3,711		20,422		2,821
Total fixed maturity available-for-sale securities	$	2,494,710	$	189,181	$	20,317	$	2,663,574	$	11,414

(1) The non-credit portion of other than temporary impairments ("OTTI") represents the amount of unrealized losses on impaired securities that were not realized in earnings as of the reporting date.  These unrealized losses are included in gross unrealized losses as of June 30, 2012 and December 31, 2011.

Our fixed maturity available-for-sale securities are U.S. dollar denominated securities.  Non-U.S. governments consist primarily of securities issued by governments and financial institutions that are explicitly guaranteed by the respective government.  At December 31, 2011, U.S. Government agencies consist of securities issued by financial institutions under the Temporary Liquidity Guarantee Program guaranteed by the Federal Deposit Insurance Corporation.

Fixed Maturity Trading Securities

The following table sets forth the fair value of our fixed maturity trading securities as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012		December 31, 2011
Non-U.S. dollar denominated securities:
Non-U.S. governments	$	113,847	$	125,126
Total fixed maturity trading securities	$	113,847	$	125,126

Our non-U.S. government fixed maturity trading securities are non-U.S. dollar denominated investments held for the purposes of hedging our non-U.S. dollar foreign currency reinsurance liabilities.

In prior periods, we have used insurance-linked securities to actively manage our exposure to catastrophe loss. We elected to record our investments in insurance-linked securities using the fair value option attributes of FASB Accounting Standards Codification ("ASC") 825, "Financial Instruments" ("ASC 825"), and recorded these in fixed maturity trading securities.  There were mark-to-market adjustments recorded under ASC 825 of less than $0.1 million of net realized losses for the three months ended June 30, 2011 and $1.3 million of net realized losses on investments for the six months ended June 30, 2011.  At acquisition, we determine our trading intent in the near term of our fixed maturity trading securities accounted for in accordance with ASC 825. If we do not intend to sell these securities in the near term, the purchases and sales are included in investing activities in our consolidated statements of cash flows, otherwise they are included in operating activities.  For the six months ended June 30, 2011, there were proceeds from sales of $20.4 million and no purchases of trading securities accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Short-term Investments

The following table sets forth the fair value of our short-term investments as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012		December 31, 2011
Available-for-sale:
U.S. Government	$	62,352	$	322,320
U.S. Government agencies		-		85,389
Trading:
Non-U.S. governments		105,426		181,125
Total short-term investments	$	167,778	$	588,834

Our U.S. dollar denominated short-term investments are accounted for as available-for-sale and our non-U.S. dollar denominated short-term investments are accounted for in accordance with the fair value option attributes of ASC 825.  The mark-to-market adjustments on short-term investments recognized under ASC 825 contributed no net realized gains or losses in the three months ended June 30, 2012 and less than $0.1 million of net realized losses on investments in the six months ended June 30, 2012.   The mark-to-market adjustments on short-term investments contributed less than $0.1 million of net realized losses for the three months ended June 30, 2011 and less than $0.1 million of net realized gains on investments for the six months ended June 30, 2011.

For the six months ended June 30, 2012, we had purchases of $106.1 million, proceeds from sales of $20.6 million and proceeds from maturities of $169.6 million from non-U.S. dollar denominated short-term investments accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.  For the six months ended June 30, 2011, we had purchases of $132.4 million, proceeds from maturities of $30.6 million and no proceeds from sales from non-U.S. dollar denominated short-term investments accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.

Other-Than-Temporary Impairments

We analyze the creditworthiness of our investment portfolio by reviewing various performance metrics of the issuer, including financial condition, credit ratings and other public information.  We determined that none of our government bonds, municipal bonds or corporate bonds were other-than-temporarily impaired for the three and six months ended June 30, 2012 and 2011.

We analyze our commercial mortgage-backed securities (“CMBS”) on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include delinquencies, defaults, foreclosures, debt-service-coverage ratios and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.  We recorded no net impairment losses related to CMBS for the three months ended June 30, 2012 and 2011, respectively, and less than $0.1 million of net impairment losses and no net impairment losses for the six months ended June 30, 2012 and 2011, respectively.  As of June 30, 2012, the single largest unrealized loss within our CMBS portfolio was $0.7 million related to a security with an amortized cost of $4.8 million.

Residential mortgage-backed securities (“RMBS”) include U.S. Government agency RMBS and non-agency RMBS.  Securities with underlying sub-prime mortgages as collateral are included in asset-backed securities (“ABS”).  We analyze our non-agency RMBS and sub-prime ABS on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include delinquencies, defaults, foreclosures, prepayment speeds and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.  We recorded net impairment losses related to non-agency RMBS of $1.1 million and $1.5 million for the three months ended June 30, 2012 and 2011, respectively, and $2.1 million and $2.4 million for the six months ended June 30, 2012 and 2011, respectively.  As of June 30, 2012, the single largest unrealized loss within our RMBS portfolio was $2.0 million related to a non-agency RMBS security with an amortized cost of $2.4 million.

We had no net impairment losses related to sub-prime ABS for the three months ended June 30, 2012 and $0.2 million of net impairment losses for the three months ended June 30, 2011.  We had no net impairment losses related to sub-prime ABS for the six months ended June 30, 2012 and $0.8 million of net impairment losses for the six months ended June 30, 2011.  As of June 30, 2012, the single largest unrealized loss within our sub-prime ABS portfolio was $2.2 million related to a security with an amortized cost of $4.4 million.

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the three months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, April 1	$	60,444		$	48,138
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		1,113			1,646
Reduction for paydowns and securities sold		(3,464	)		(1,786	)
Reduction for increases in cash flows expected to be collected		(219	)		(146	)
Ending balance, June 30	$	57,874		$	47,872

- 8 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the six months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, January 1	$	61,841		$	48,845
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		2,183			3,153
Reduction for paydowns and securities sold		(5,721	)		(3,901	)
Reduction for increases in cash flows expected to be collected		(429	)		(245	)
Ending balance, June 30	$	57,874		$	47,872

As of June 30, 2012, total cumulative credit losses were related to CMBS, non-agency RMBS and sub-prime ABS.  The cumulative credit losses we recorded on CMBS of $4.1 million were on four securities issued from 2006 to 2007.  As of June 30, 2012, 6.4% of the mortgages backing these securities were 90 days or more past due and 0.9% of the mortgages had incurred cumulative losses.  For these securities, the expected losses for the underlying mortgages were greater than the remaining average credit support of 20.3%.   The cumulative credit losses we recorded on non-agency RMBS and sub-prime ABS of $53.8 million were on twenty-eight securities issued from 2004 to 2007.  As of June 30, 2012, 16.6% of the mortgages backing these securities were 90 days or more past due and 5.5% of the mortgages had incurred cumulative losses.  For these securities, the expected losses for the underlying mortgages were greater than the remaining average credit support of 6.8%.   

Unrealized Losses

The following table sets forth our gross unrealized losses on securities classified as fixed maturity available-for-sale aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.  The amounts only relate to securities in an unrealized loss position as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012				December 31, 2011
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Less than twelve months:
Municipal bonds	$	5,801	$	1	$	4,751	$	131
Non-U.S. governments		-		-		9,988		29
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		11,398		175		19,797		1,047
Residential mortgage-backed securities		96,128		371		131,574		2,112
Asset-backed securities		703		258		580		84
Total	$	151,449	$	1,521	$	179,216	$	4,166
Twelve months or more:
Municipal bonds	$	3,014	$	17	$	3,002	$	47
Non-U.S. governments		4,814		185		4,373		626
Corporate bonds		-		-		-		-
Commercial mortgage-backed securities		16,529		1,199		6,171		1,537
Residential mortgage-backed securities		46,116		8,949		43,704		10,314
Asset-backed securities		16,614		3,200		16,854		3,627
Total	$	87,087	$	13,550	$	74,104	$	16,151
Total unrealized losses:
Municipal bonds	$	8,815	$	18	$	7,753	$	178
Non-U.S. governments		4,814		185		14,361		655
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		27,927		1,374		25,968		2,584
Residential mortgage-backed securities		142,244		9,320		175,278		12,426
Asset-backed securities		17,317		3,458		17,434		3,711
Total	$	238,536	$	15,071	$	253,320	$	20,317

We believe that the gross unrealized losses in our fixed maturity available-for-sale securities portfolio represent temporary declines in fair value.  We believe that the unrealized losses are not necessarily predictive of ultimate performance and that the provisions we have made for net impairment losses are adequate.  However, economic conditions may deteriorate more than expected and may adversely affect the expected cash flows of our securities, which in turn may lead to impairment losses being recorded in future periods.  Conversely, economic conditions may improve more than expected and favorably increase the expected cash flows of our impaired securities, which would be earned through net investment income over the remaining life of the security.

- 9 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Net Investment Income

The following table sets forth our net investment income for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Fixed maturity securities	$	24,583		$	32,561		$	51,870		$	64,412
Short-term investments and cash and cash equivalents		1,989			2,091			3,811			3,590
Funds held		600			395			1,254			613
Subtotal		27,172			35,047			56,935			68,615
Investment expenses		(1,017	)		(1,082	)		(2,228	)		(2,272	)
Net investment income	$	26,155		$	33,965		$	54,707		$	66,343

Net Realized Gains (Losses) on Investments

The following table sets forth our net realized gains (losses) on investments for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Gross realized gains on the sale of investments	$	25,263		$	477		$	47,941		$	4,421
Gross realized losses on the sale of investments		-			(6,894	)		(1	)		(6,897	)
Net realized gains (losses) on the sale of investments		25,263			(6,417	)		47,940			(2,476	)
Mark-to-market adjustments on trading securities		(285	)		1,728			(623	)		(1,806	)
Net realized gains (losses) on investments	$	24,978		$	(4,689	)	$	47,317		$	(4,282	)

Maturities

The actual maturities of our fixed maturity available-for-sale and trading securities could differ from stated maturities due to call or prepayment provisions.  The following table sets forth the amortized cost and fair value of our fixed maturity available-for-sale and trading securities by stated maturity as of June 30, 2012 ($ in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	93,049	$	93,926
Due from one to five years		430,712		456,377
Due from five to ten years		570,958		626,049
Due in ten or more years		653,038		750,204
Mortgage-backed and asset-backed securities		494,359		497,278
Total	$	2,242,116	$	2,423,834

3. Fair Value Measurements

The accounting guidance relating to fair value measurements addresses how a company should measure fair value when required to use a fair value measure for recognition or disclosure purposes.  The fair values of our financial assets and liabilities addressed by this guidance are determined primarily through the use of observable inputs.  Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from external independent sources.  Unobservable inputs reflect management’s assumptions about what market participants’ assumptions would be in pricing the asset or liability based on the best information available.  We classify our financial assets and liabilities in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.  This classification requires judgment in assessing the market and pricing methodologies for a particular security.  The fair value hierarchy is comprised of the following three levels:

Level 1: Valuations are based on unadjusted quoted prices in active markets for identical financial assets or liabilities;

Level 2: Valuations are based on prices obtained from independent index providers, pricing vendors or broker-dealers using observable inputs for financial assets and liabilities; and

Level 3: Valuations are based on unobservable inputs for assets and liabilities where there is little or no market activity.  Management’s assumptions and/or internal valuation pricing models may be used to determine the fair value of financial assets or liabilities.

- 10 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

The following table presents the fair value hierarchy for those financial assets and liabilities measured at fair value on a recurring basis by the Company as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Fair Value Measurement Using:
	Total		Level 1		Level 2		Level 3
June 30, 2012:
Investments:
U.S. Government	$	5,011	$	5,011	$	-	$	-
U.S. Government agencies		10,164		-		10,164		-
Municipal bonds		1,352,837		-		1,352,837		-
Non-U.S. governments		208,142		55,431		152,711		-
Corporate bonds		350,402		-		350,402		-
Commercial mortgage-backed securities		201,356		-		201,356		-
Residential mortgage-backed securities		276,282		-		268,821		7,461
Asset-backed securities		19,640		-		18,074		1,566
Short-term investments		167,778		-		167,778		-
Total	$	2,591,612	$	60,442	$	2,522,143	$	9,027
December 31, 2011:
Investments:
U.S. Government	$	5,083	$	5,083	$	-	$	-
U.S. Government agencies		100,259		-		100,259		-
Municipal bonds		1,660,760		-		1,660,760		-
Non-U.S. governments		196,392		55,561		140,831		-
Corporate bonds		349,548		-		349,548		-
Commercial mortgage-backed securities		204,609		-		204,609		-
Residential mortgage-backed securities		251,627		-		243,481		8,146
Asset-backed securities		20,422		-		18,555		1,867
Short-term investments		588,834		34,894		553,940		-
Total	$	3,377,534	$	95,538	$	3,271,983	$	10,013

The fair values of our fixed maturity securities and short-term investments are generally based on prices obtained from independent index providers, pricing vendors or broker-dealers using observable inputs.  Fixed maturity securities and short-term investments are generally valued using the market approach.  The following table describes the valuation techniques, assumptions, and significant inputs used to determine the fair value of our financial assets and liabilities as well as their classification pursuant to the fair value hierarchy:

U.S. Government	The fair values of U.S. Government securities were based on quoted prices in active markets for identical assets.  The fair value measurements were classified as Level 1.
U.S Government agencies	Our U.S. Government agencies portfolio consisted of securities issued by financial institutions guaranteed by the Federal Deposit Insurance Corporation.  The observable inputs used to price these securities may include the spread above the risk-free yield curve, reported trades and broker-dealer quotes.  The fair value measurements were classified as Level 2.
Municipal bonds	The fair values of municipal bonds were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, benchmark securities, bids, credit risks and economic indicators.  The fair value measurements were classified as Level 2.
Non-U.S. governments	Our non-U.S. government bond portfolio consisted of securities issued primarily by governments, provinces, agencies and supranationals as well as debt issued by financial institutions that is guaranteed by non-U.S. governments.  The fair values of non-U.S. government securities were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades and broker-dealer quotes.  The fair value measurements were classified as Level 1 or Level 2.
Corporate bonds	The observable inputs used to price corporate issues may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, benchmark securities, bids, credit risks and industry and economic indicators.  The fair value measurements were classified as Level 2.

- 11 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Commercial mortgage-backed securities The fair values of CMBS were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2.

Residential mortgage-backed securities Our RMBS portfolio was comprised of securities issued by U.S. Government agencies and by non-agency institutions.  The observable inputs used to price U.S. Government agency RMBS may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, loan level information and prepayment speeds.  The observable inputs used to price non-agency RMBS may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, prepayment speeds, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2 or Level 3.

Asset-backed securities The fair values of ABS were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, type of collateral, prepayment speeds, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2 or Level 3.

Short-term investments

Short-term investments were carried at fair value based on observable inputs or carried at amortized cost, which approximates fair value.  The fair value measurements were classified as Level 1 or Level 2.

Derivative instruments

Our derivative instruments may include interest rate options, commodity options and other derivative instruments.  See Note 4 for additional disclosure on our derivative instruments.  Our interest rate and commodity options were exchange traded and the fair values were based on quoted prices in active markets for identical assets.  The fair values were classified as Level 1.  The fair value of our other derivative instrument was determined by management primarily using unobservable inputs through the application of our own assumptions and internal valuation pricing models.  The fair value was classified as Level 3.

The fair value measurements of our non-agency RMBS and sub-prime ABS classified as Level 3 used significant unobservable inputs that include prepayment rates, probability of default, and loss severity in the event of default.  These measurements were based upon unadjusted third party pricing sources. The fair value measurement of our other derivative instrument classified as Level 3 used significant unobservable inputs through the application of our own assumptions and internal valuation pricing models.  Unobservable inputs used in the internal valuation pricing model included the unpaid contract premiums, probability of losses triggered under the covered perils for first and second events, the remaining time to the end of the annual contract period and the seasonality of risks.  Significant increases or decreases in any of these inputs in isolation may result in a significantly lower or higher fair value measurement.

Level 3 Financial Assets and Liabilities

The following tables reconcile the beginning and ending balance for our Level 3 financial assets and liabilities measured at fair value on a recurring basis for the three months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, April 1	$	5,564		$	1,723		$	-	$	7,287
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(641	)		-			-		(641	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		285			(157	)		-		128
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		-			-			-		-
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

- 12 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

	Three Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, April 1	$	3,305		$	909		$	1,257		$	5,471
Purchases		-			-			-			-
Issuances		-			-			-			-
Settlements		-			-			2,427			2,427
Sales, maturities and paydowns		(89	)		-			-			(89	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(4,474	)		(4,474	)
Total net unrealized gains (losses) included in comprehensive income (loss)		(407	)		525			-			118
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(4,474	)	$	(4,474	)

The following tables reconcile the beginning and ending balance for our Level 3 financial assets and liabilities measured at fair value on a recurring basis for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, January 1	$	8,146		$	1,867		$	-	$	10,013
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(734	)		-			-		(734	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		50			(301	)		-		(251	)
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		(2,254	)		-			-		(2,254	)
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

	Six Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, January 1	$	2,449		$	1,069		$	(4,871	)	$	(1,353	)
Purchases		-			-			4,829			4,829
Issuances		-			-			-			-
Settlements		-			-			-			-
Sales, maturities and paydowns		(165	)		-			-			(165	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(748	)		(748	)
Total net unrealized gains (losses) included in comprehensive income (loss)		525			365			-			890
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(748	)	$	(748	)

Transfers of assets and liabilities into or out of Level 3 are recorded at their fair values as of the end of each reporting period, consistent with the date of the determination of fair value.  The transfers into and out of Level 3 were due to the sufficiency of evidence available to corroborate significant observable inputs with market observable information.  There were no transfers between Levels 1 and 2 during the three and six months ended June 30, 2012 and 2011.

Other Financial Assets and Liabilities Not Carried at Fair Value

Accounting guidance requires disclosures of the fair value of other financial assets and liabilities, however insurance contracts are excluded.

- 13 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

The Series B 7.5% Notes due June 1, 2017 (the "debt obligations") on our consolidated balance sheets were recorded at cost with a carrying value of $250.0 million at June 30, 2012 and December 31, 2011, and had a fair value of $273.2 million and $269.0 million at June 30, 2012 and December 31, 2011, respectively.  The fair value measurements were based on observable inputs and therefore would be considered to be Level 2.

Our other financial assets and liabilities not referred to above were carried at cost or amortized cost, which generally approximates fair value, at June 30, 2012 and December 31, 2011. The fair value measurements were based on observable inputs and therefore would be considered to be Level 1 or Level 2.

4. Derivative Instruments

At December 31, 2011 and during the period January 1, 2012 through June 30, 2012, we held no derivative instruments.  In prior periods, including the six months ended June 30, 2011, we held derivative instruments.  Our derivative instruments are recorded in the consolidated balance sheets at fair value as other assets or other liabilities, with changes in fair values and realized gains and losses recognized in net changes in fair value of derivatives in the consolidated statements of operations.  None of our derivatives were designated as hedges under current accounting guidance.  Our objectives for entering into derivative agreements are as follows:

Interest Rate Options

We use interest rate options within our portfolio of fixed maturity investments to manage our exposure to interest rate risk.

Commodity Options

We use commodity options to hedge certain underwriting risks.

Other Derivative Instrument

We use other derivative instruments to hedge certain underwriting risks.

In August 2008, we entered into a derivative agreement with Topiary Capital Limited (“Topiary”), a Cayman Islands special purpose vehicle, that provided us with the ability to recover up to $200.0 million if two catastrophic events involving U.S. wind, U.S. earthquake, European wind or Japanese earthquake occurred that met specified loss criteria during any of three annual periods commencing August 1, 2008.  The derivative agreement with Topiary expired on July 31, 2011 and no recovery was made.

Expense related to our other derivative instrument recorded in net changes in fair value of derivatives was $4.5 million and $0.7 million for the three and six months ended June 30, 2011.

5. Credit Facilities

Syndicated Credit Facility

On June 24, 2011, we entered into an amended and restated three-year $300.0 million credit facility (the "Syndicated Credit Facility") that consists of a $100.0 million unsecured senior credit facility available for revolving borrowings and letters of credit and a $200.0 million secured senior credit facility available for letters of credit.  The Syndicated Credit Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the Syndicated Credit Facility.

Letter of Credit Facility

On June 30, 2011, our reinsurance subsidiaries entered into a letter of credit facility in the maximum aggregate amount of $100.0 million (the “LOC Facility”) that expires on December 31, 2013.  Under the terms of the LOC Facility, up to $100.0 million is available for the issuance of letters of credit to support reinsurance obligations of our reinsurance subsidiaries.  The LOC Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the LOC Facility.

We had no cash borrowings under the Syndicated Credit Facility during the six months ended June 30, 2012.  The following table summarizes the outstanding letters of credit and the cash and cash equivalents and investments held in trust to collateralize the letters of credit issued as of June 30, 2012 ($ in thousands):

	Letters of Credit				Collateral
	Capacity		Issued		Cash and Cash Equivalents		Investments		Total
Syndicated Credit Facility:
Secured	$	200,000	$	101,399	$	118,287	$	-	$	118,287
Unsecured		100,000		-		-		-		-
Total Syndicated Credit Facility		300,000		101,399		118,287		-		118,287
LOC Facility		100,000		36,273		32,010		13,268		45,278
Total	$	400,000	$	137,672	$	150,297	$	13,268	$	163,565

- 14 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

6. Income Taxes

We provide for income tax expense or benefit based upon income reported in the consolidated financial statements and the provisions of currently enacted tax laws.  Platinum Holdings and Platinum Bermuda are incorporated under the laws of Bermuda and are subject to Bermuda law with respect to taxation.  Under current Bermuda law, Platinum Holdings and Platinum Bermuda are not taxed on any Bermuda income or capital gains and they have received an assurance from the Bermuda Minister of Finance that if any legislation is enacted in Bermuda that would impose tax computed on profits or income, or computed on any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, then the imposition of any such tax will not be applicable to Platinum Holdings or Platinum Bermuda or any of their respective operations, shares, debentures or other obligations until March 31, 2035.  Platinum Holdings has subsidiaries based in the United States and Ireland that are subject to the tax laws thereof.

The 2003 income tax return of our U.S.-based subsidiaries is currently under examination by the U.S. Internal Revenue Service. The income tax returns that remain open to examination are for calendar years 2008 and forward.

7. Share Repurchases

Our Board of Directors has authorized the repurchase of our common shares through a share repurchase program.  Since the program was established, our Board of Directors has approved increases in the repurchase program from time to time, most recently on July 23, 2012, to result in authority as of such date to repurchase up to a total of $250.0 million of our common shares.

During the six months ended June 30, 2012, in accordance with the share repurchase program, we repurchased 2,464,471 of our common shares in the open market for an aggregate cost of $89.9 million at a weighted average cost including commissions of $36.49 per share.  The shares we repurchased were canceled.

8. Statutory Regulations and Dividend Capacity

The laws and regulations of Bermuda and the United States include certain restrictions on the amount of dividends that can be paid by Platinum Bermuda and Platinum US to their respective parent companies, Platinum Holdings and Platinum Finance, without the prior approval of the relevant regulatory authorities.  Based on regulatory restrictions, the maximum amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval is as follows ($ in thousands):

Platinum Bermuda	$	286,574
Platinum US		52,992
Total	$	339,566

During the six months ended June 30, 2012, dividends of $70.0 million were paid by Platinum Bermuda to Platinum Holdings.  Therefore, as of June 30, 2012, the remaining amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval was $269.6 million.  Subsequent to June 30, 2012, Platinum Bermuda declared and paid a dividend of $50.0 million to Platinum Holdings.

There are no regulatory restrictions on the amount of dividends that Platinum Finance can pay to Platinum Regency. Irish law prohibits Platinum Regency from declaring a dividend to Platinum Holdings unless it has “profits available for distribution.”  The determination of whether a company has profits available for distribution is based on its accumulated realized profits less its accumulated realized losses.

9. Operating Segment Information

We have organized our worldwide reinsurance business into the following three operating segments: Property and Marine, Casualty and Finite Risk.  The Property and Marine segment includes principally property and marine reinsurance coverages that are written in the United States and international markets.  This operating segment includes property reinsurance, crop reinsurance and marine and aviation reinsurance.  The Property and Marine segment includes property catastrophe and marine excess-of-loss reinsurance contracts, property and marine per-risk excess-of-loss reinsurance contracts and property proportional reinsurance contracts.  The Casualty segment includes reinsurance contracts that cover general and product liability, professional liability, accident and health, umbrella liability, workers' compensation, casualty clash, automobile liability, surety, trade credit, and political risk.  We generally seek to write casualty reinsurance on an excess-of-loss basis.  The Finite Risk operating segment includes principally structured reinsurance contracts with ceding companies whose needs may not be met efficiently through traditional reinsurance products.  In exchange for contractual features that limit our risk, reinsurance contracts that we include in our Finite Risk segment typically provide the potential for significant profit commission to the ceding company.  The classes of risks underwritten through our finite risk contracts are generally consistent with the classes covered by our traditional products.  The finite risk reinsurance contracts that we underwrite generally provide prospective protection, meaning coverage is provided for losses that are incurred after inception of the contract, as contrasted with retrospective coverage, which covers losses that are incurred prior to inception of the contract.  The three main categories of finite risk contracts are quota share, multi-year excess-of-loss and whole account aggregate stop loss.

In managing our operating segments, we use measures such as net underwriting income and underwriting ratios to evaluate segment performance.  We do not allocate assets or certain income and expenses such as net investment income, net realized gains and losses on investments, net impairment losses on investments, net changes in fair value of derivatives, net foreign currency exchange gains and losses, interest expense and certain corporate expenses by segment.  The measures we use in evaluating our operating segments should not be used as a substitute for measures determined under U.S. GAAP.  Underwriting ratios are considered to be non-GAAP measures and are calculated for net losses and LAE, net acquisition expense and net underwriting expense.  The ratios are calculated by dividing the related expense by net earned premiums.  The following table summarizes underwriting activity and ratios for the three operating segments, together with a reconciliation of segment underwriting income (loss) to income (loss) before income taxes for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

- 15 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

	Three Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	61,695		$	72,678		$	7,086		$	141,459
Net premiums earned		62,838			75,746			6,491			145,075
Net losses and loss adjustment expenses		17,653			45,851			3,613			67,117
Net acquisition expenses		8,721			18,487			2,992			30,200
Other underwriting expenses		7,454			5,625			267			13,346
Segment underwriting income (loss)	$	29,010		$	5,783		$	(381	)		34,412
Net investment income											26,155
Net realized gains (losses) on investments											24,978
Net impairment losses on investments											(1,113	)
Other income (expense)											(191	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(6,350	)
Net foreign currency exchange (losses) gains											310
Interest expense											(4,774	)
Income (loss) before income taxes										$	73,427
Underwriting ratios:
Net loss and loss adjustment expense		28.1	%		60.5	%		55.7	%		46.3	%
Net acquisition expense		13.9	%		24.4	%		46.1	%		20.8	%
Other underwriting expense		11.9	%		7.4	%		4.1	%		9.2	%
Combined		53.9	%		92.3	%		105.9	%		76.3	%
	Three Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	54,411		$	69,234		$	2,242		$	125,887
Net premiums earned		91,852			77,104			3,480			172,436
Net losses and loss adjustment expenses		116,543			43,868			(1,054	)		159,357
Net acquisition expenses		12,009			18,144			3,962			34,115
Other underwriting expenses		7,274			4,829			264			12,367
Segment underwriting income (loss)	$	(43,974	)	$	10,263		$	308			(33,403	)
Net investment income											33,965
Net realized gains (losses) on investments											(4,689	)
Net impairment losses on investments											(1,666	)
Other income (expense)											(60	)
Net changes in fair value of derivatives											(4,474	)
Corporate expenses not allocated to segments											(4,738	)
Net foreign currency exchange (losses) gains											(614	)
Interest expense											(4,767	)
Income (loss) before income taxes										$	(20,446	)
Underwriting ratios:
Net loss and loss adjustment expense		126.9	%		56.9	%		(30.3	%)		92.4	%
Net acquisition expense		13.1	%		23.5	%		113.9	%		19.8	%
Other underwriting expense		7.9	%		6.3	%		7.6	%		7.2	%
Combined		147.9	%		86.7	%		91.2	%		119.4	%

- 16 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

	Six Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	129,848		$	147,078		$	8,194		$	285,120
Net premiums earned		124,166			151,512			7,609			283,287
Net losses and loss adjustment expenses		58,590			86,887			836			146,313
Net acquisition expenses		17,956			35,862			7,039			60,857
Other underwriting expenses		14,289			10,661			458			25,408
Segment underwriting income (loss)	$	33,331		$	18,102		$	(724	)		50,709
Net investment income											54,707
Net realized gains (losses) on investments											47,317
Net impairment losses on investments											(2,183	)
Other income (expense)											(670	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(11,271	)
Net foreign currency exchange (losses) gains											(222	)
Interest expense											(9,546	)
Income (loss) before income taxes										$	128,841
Underwriting ratios:
Net loss and loss adjustment expense		47.2	%		57.3	%		11.0	%		51.6	%
Net acquisition expense		14.5	%		23.7	%		92.5	%		21.5	%
Other underwriting expense		11.5	%		7.0	%		6.0	%		9.0	%
Combined		73.2	%		88.0	%		109.5	%		82.1	%
	Six Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	166,213		$	149,753		$	4,706		$	320,672
Net premiums earned		189,757			157,928			7,632			355,317
Net losses and loss adjustment expenses		394,873			83,487			592			478,952
Net acquisition expenses		25,635			36,707			5,723			68,065
Other underwriting expenses		14,595			10,161			499			25,255
Segment underwriting income (loss)	$	(245,346	)	$	27,573		$	818			(216,955	)
Net investment income											66,343
Net realized gains (losses) on investments											(4,282	)
Net impairment losses on investments											(3,173	)
Other income (expense)											1,036
Net changes in fair value of derivatives											(748	)
Corporate expenses not allocated to segments											(9,001	)
Net foreign currency exchange (losses) gains											(803	)
Interest expense											(9,533	)
Income (loss) before income taxes										$	(177,116	)
Underwriting ratios:
Net loss and loss adjustment expense		208.1	%		52.9	%		7.8	%		134.8	%
Net acquisition expense		13.5	%		23.2	%		75.0	%		19.2	%
Other underwriting expense		7.7	%		6.4	%		6.5	%		7.1	%
Combined		229.3	%		82.5	%		89.3	%		161.1	%

- 17 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

10. Earnings (Loss) per Common Share

The following is a reconciliation of basic and diluted earnings or loss per common share for the three and six months ended June 30, 2012 and 2011 ($ and amounts in thousands, except per share data):

	Three Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2012			2011			2012			2011
Earnings (Loss)
Basic and Diluted
Net income (loss) attributable to common shareholders	$	67,532		$	(20,401	)	$	120,819		$	(177,593	)
Portion allocated to participating common shareholders (1)		(278	)		137			(485	)		1,069
Net income (loss) allocated to common shareholders	$	67,254		$	(20,264	)	$	120,334		$	(176,524	)
Common Shares
Basic
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Diluted
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Effect of dilutive securities:
Common share options		142			127			139			268
Restricted share units		48			159			64			269
Adjusted weighted average common shares outstanding		34,104			37,399			34,805			37,692
Earnings (Loss) Per Common Share
Basic earnings (loss) per common share	$	1.98		$	(0.55	)	$	3.48		$	(4.75	)
Diluted earnings (loss) per common share (2)	$	1.97		$	(0.55	)	$	3.46		$	(4.75	)

(1) Represents earnings attributable to holders of unvested restricted shares issued under the Company's share incentive plans that are considered to be participating securities.

(2) During a period of loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation as the effect of including potential dilutive shares would be anti-dilutive.

11. Condensed Consolidating Financial Information

Platinum Holdings fully and unconditionally guarantees the $250.0 million of debt obligations issued by Platinum Finance.

The following tables present the condensed consolidating financial information for Platinum Holdings, Platinum Finance and the non-guarantor subsidiaries of Platinum Holdings as of June 30, 2012 and December 31, 2011 and for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

- 18 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Condensed Consolidating Balance Sheet

June 30, 2012

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	232	$	2,591,380	$	-		$	2,591,612
Investment in subsidiaries		1,700,293		655,570		512,671		(2,868,534	)		-
Cash and cash equivalents		17,665		103,139		1,345,179		-			1,465,983
Reinsurance assets		-		-		288,698		-			288,698
Other assets		8,379		5,362		64,903		-			78,644
Total assets	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,408,816	$	-		$	2,408,816
Debt obligations		-		250,000		-		-			250,000
Other liabilities		4,510		1,632		38,152		-			44,294
Total liabilities	$	4,510	$	251,632	$	2,446,968	$	-		$	2,703,110
Shareholders' Equity
Common shares	$	332	$	-	$	8,000	$	(8,000	)	$	332
Additional paid-in capital		227,482		213,405		2,020,382		(2,233,787	)		227,482
Accumulated other comprehensive income		148,562		43,804		192,357		(236,161	)		148,562
Retained earnings		1,345,451		255,462		135,124		(390,586	)		1,345,451
Total shareholders' equity	$	1,721,827	$	512,671	$	2,355,863	$	(2,868,534	)	$	1,721,827
						-
Total liabilities and shareholders' equity	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937

Condensed Consolidating Balance Sheet

December 31, 2011

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	274	$	3,377,260	$	-		$	3,377,534
Investment in subsidiaries		1,638,898		621,041		484,561		(2,744,500	)		-
Cash and cash equivalents		47,791		108,260		636,459		-			792,510
Reinsurance assets		-		-		297,374		-			297,374
Other assets		6,229		6,620		71,344		-			84,193
Total assets	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,573,701	$	-		$	2,573,701
Debt obligations		-		250,000		-		-			250,000
Other liabilities		2,059		1,634		33,358		-			37,051
Total liabilities	$	2,059	$	251,634	$	2,607,059	$	-		$	2,860,752
Shareholders' Equity
Common shares	$	355	$	-	$	8,000	$	(8,000	)	$	355
Additional paid-in capital		313,730		213,342		2,000,335		(2,213,677	)		313,730
Accumulated other comprehensive income		146,635		41,277		187,903		(229,180	)		146,635
Retained earnings		1,230,139		229,942		63,701		(293,643	)		1,230,139
Total shareholders' equity	$	1,690,859	$	484,561	$	2,259,939	$	(2,744,500	)	$	1,690,859
Total liabilities and shareholders' equity	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611

- 19 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	145,075		$	-		$	145,075
Net investment income		2			12			26,141			-			26,155
Net realized gains (losses) on investments		-			-			24,978			-			24,978
Net impairment losses on investments		-			-			(1,113	)		-			(1,113	)
Other income (expense)		991			-			(1,182	)		-			(191	)
Total revenue		993			12			193,899			-			194,904
Expenses:
Net losses and loss adjustment expenses		-			-			67,117			-			67,117
Net acquisition expenses		-			-			30,200			-			30,200
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		5,834			67			13,795			-			19,696
Net foreign currency exchange losses (gains)		-			-			(310	)		-			(310	)
Interest expense		-			4,774			-			-			4,774
Total expenses		5,834			4,841			110,802			-			121,477
Income (loss) before income taxes		(4,841	)		(4,829	)		83,097			-			73,427
Income tax expense (benefit)		-			(1,627	)		7,522			-			5,895
Income (loss) before equity in earnings of subsidiaries		(4,841	)		(3,202	)		75,575			-			67,532
Equity in earnings of subsidiaries		72,373			15,004			11,802			(99,179	)		-
Net income (loss)	$	67,532		$	11,802		$	87,377		$	(99,179	)	$	67,532
Other comprehensive income, net of deferred taxes		8,104			3,221			11,326			(14,547	)		8,104
Comprehensive income (loss)	$	75,636		$	15,023		$	98,703		$	(113,726	)	$	75,636

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	172,436		$	-		$	172,436
Net investment income		1			(7	)		33,971			-			33,965
Net realized gains (losses) on investments		-			-			(4,689	)		-			(4,689	)
Net impairment losses on investments		-			-			(1,666	)		-			(1,666	)
Other income (expense)		(967	)		3			904			-			(60	)
Total revenue		(966	)		(4	)		200,956			-			199,986
Expenses:
Net losses and loss adjustment expenses		-			-			159,357			-			159,357
Net acquisition expenses		-			-			34,115			-			34,115
Net changes in fair value of derivatives		-			-			4,474			-			4,474
Operating expenses		5,826			143			11,136			-			17,105
Net foreign currency exchange losses (gains)		-			-			614			-			614
Interest expense		-			4,767			-			-			4,767
Total expenses		5,826			4,910			209,696			-			220,432
Income (loss) before income taxes		(6,792	)		(4,914	)		(8,740	)		-			(20,446	)
Income tax expense (benefit)		-			(1,679	)		1,634			-			(45	)
Income (loss) before equity in earnings of subsidiaries		(6,792	)		(3,235	)		(10,374	)		-			(20,401	)
Equity in earnings of subsidiaries		(13,609	)		5,047			1,835			6,727			-
Net income (loss)	$	(20,401	)	$	1,812		$	(8,539	)	$	6,727		$	(20,401	)
Other comprehensive income, net of deferred taxes		52,518			22,054			74,574			(96,628	)		52,518
Comprehensive income (loss)	$	32,117		$	23,866		$	66,035		$	(89,901	)	$	32,117

- 20 -

Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	283,287		$	-		$	283,287
Net investment income		3			(7	)		54,711			-			54,707
Net realized gains (losses) on investments		-			-			47,317			-			47,317
Net impairment losses on investments		-			-			(2,183	)		-			(2,183	)
Other income (expense)		2,187			1			(2,858	)		-			(670	)
Total revenue		2,190			(6	)		380,274			-			382,458
Expenses:
Net losses and loss adjustment expenses		-			-			146,313			-			146,313
Net acquisition expenses		-			-			60,857			-			60,857
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		10,775			133			25,771			-			36,679
Net foreign currency exchange losses (gains)		-			-			222			-			222
Interest expense		-			9,546			-			-			9,546
Total expenses		10,775			9,679			233,163			-			253,617
Income (loss) before income taxes		(8,585	)		(9,685	)		147,111			-			128,841
Income tax expense (benefit)		-			(3,265	)		11,287			-			8,022
Income (loss) before equity in earnings of subsidiaries		(8,585	)		(6,420	)		135,824			-			120,819
Equity in earnings of subsidiaries		129,404			31,941			25,521			(186,866	)		-
Net income (loss)	$	120,819		$	25,521		$	161,345		$	(186,866	)	$	120,819
Other comprehensive income, net of deferred taxes		1,927			2,527			4,454			(6,981	)		1,927
Comprehensive income (loss)	$	122,746		$	28,048		$	165,799		$	(193,847	)	$	122,746

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	355,317		$	-		$	355,317
Net investment income		3			46			66,347			(53	)		66,343
Net realized gains (losses) on investments		-			-			(4,282	)		-			(4,282	)
Net impairment losses on investments		-			-			(3,173	)		-			(3,173	)
Other income (expense)		(1,692	)		118			2,610			-			1,036
Total revenue		(1,689	)		164			416,819			(53	)		415,241
Expenses:
Net losses and loss adjustment expenses		-			-			478,952			-			478,952
Net acquisition expenses		-			-			68,065			-			68,065
Net changes in fair value of derivatives		-			-			748			-			748
Operating expenses		10,049			202			24,005			-			34,256
Net foreign currency exchange losses (gains)		1			-			802			-			803
Interest expense		53			9,533			-			(53	)		9,533
Total expenses		10,103			9,735			572,572			(53	)		592,357
Income (loss) before income taxes		(11,792	)		(9,571	)		(155,753	)		-			(177,116	)
Income tax expense (benefit)		(600	)		(3,263	)		4,340			-			477
Income (loss) before equity in earnings of subsidiaries		(11,192	)		(6,308	)		(160,093	)		-			(177,593	)
Equity in earnings of subsidiaries		(166,401	)		13,834			7,573			144,994			-
Net income (loss)	$	(177,593	)	$	7,526		$	(152,520	)	$	144,994		$	(177,593	)
Other comprehensive income, net of deferred taxes		64,522			23,103			87,625			(110,728	)		64,522
Comprehensive income (loss)	$	(113,071	)	$	30,629		$	(64,895	)	$	34,266		$	(113,071	)

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Platinum Underwriters Holdings, Ltd. and Subsidiaries

Notes to Consolidated Financial Statements (Unaudited), continued

For the Three and Six Months Ended June 30, 2012 and 2011

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(5,698	)	$	(5,161	)	$	(48,326	)	$	-			$	(59,185	)
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			395,269			-				395,269
Proceeds from sale of short-term investments		-			-			20,597			-				20,597
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			40			179,728			-				179,768
Proceeds from maturity of short-term investments		-			-			577,296			-				577,296
Acquisition of fixed maturity available-for-sale securities		-			-			(172,110	)		-				(172,110	)
Acquisition of short-term investments		-			-			(168,542	)		-				(168,542	)
Dividends from subsidiaries		70,000			-			-			(70,000	)			-
Net cash provided by (used in) investing activities		70,000			40			832,238			(70,000	)			832,278
Financing Activities:
Dividends paid to common shareholders		(5,507	)		-			(70,000	)		70,000				(5,507	)
Repurchase of common shares		(89,935	)		-			-			-				(89,935	)
Proceeds from exercise of common share options		1,014			-			-			-				1,014
Net cash provided by (used in) financing activities		(94,428	)		-			(70,000	)		70,000				(94,428	)
Effect of foreign currency exchange rate changes on cash		-			-			(5,192	)		-				(5,192	)
Net increase (decrease) in cash and cash equivalents		(30,126	)		(5,121	)		708,720			-				673,473
Cash and cash equivalents at beginning of period		47,791			108,260			636,459			-				792,510
Cash and cash equivalents at end of period	$	17,665		$	103,139		$	1,345,179		$	-			$	1,465,983

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(1,275	)	$	(6,482	)	$	41,045		$	-		$	33,288
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			353,402			-			353,402
Proceeds from sale of fixed maturity trading securities		-			-			20,413			-			20,413
Proceeds from sale of short-term investments		-			-			27,995			-			27,995
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			63			72,631			-			72,694
Proceeds from maturity of short-term investments		-			-			140,014			-			140,014
Acquisition of fixed maturity available-for-sale securities		-			-			(34,499	)		-			(34,499	)
Acquisition of short-term investments		-			-			(211,527	)		-			(211,527	)
Dividends from subsidiaries		280,000			-			-			(280,000	)		-
Investment in subsidiary		(120,000	)		(3,000	)		-			123,000			-
Inter-company loans		-			75,000			100,000			(175,000	)		-
Net cash provided by (used in) investing activities		160,000			72,063			468,429			(332,000	)		368,492
Financing Activities:
Dividends paid to common shareholders		(5,933	)		-			(280,000	)		280,000			(5,933	)
Repurchase of common shares		(33,907	)		-			-			-			(33,907	)
Purchase of common share options		(47,900	)		-			-			-			(47,900	)
Proceeds from exercise of common share options		1,132			-			-			-			1,132
Capital contribution from parent		-			-			123,000			(123,000	)		-
Inter-company loans		(75,000	)		-			(100,000	)		175,000			-
Net cash provided by (used in) financing activities		(161,608	)		-			(257,000	)		332,000			(86,608	)
Effect of foreign currency exchange rate changes on cash		-			-			15,724			-			15,724
Net increase (decrease) in cash and cash equivalents		(2,883	)		65,581			268,198			-			330,896
Cash and cash equivalents at beginning of period		45,035			7,347			935,495			-			987,877
Cash and cash equivalents at end of period	$	42,152		$	72,928		$	1,203,693		$	-		$	1,318,773

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

The following discussion and analysis should be read in conjunction with the consolidated financial statements and related notes thereto included in this Quarterly Report on Form 10-Q for the period ended June 30, 2012 (this “Form 10-Q”) and the consolidated financial statements and related notes thereto and Item 7, “Management's Discussion and Analysis of Financial Condition and Results of Operations,” included in our Annual Report on Form 10-K for the year ended December 31, 2011 (the “2011 Form 10-K”).  This Form 10-Q contains forward-looking statements that involve risks and uncertainties.  Please see Item 1A, “Risk Factors,” in our 2011 Form 10-K and the “Note on Forward-Looking Statements” below.  The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (“U.S. GAAP”).

Overview

Platinum Underwriters Holdings, Ltd. (“Platinum Holdings”) is a holding company domiciled in Bermuda.  Through our reinsurance subsidiaries we provide property and marine, casualty and finite risk reinsurance coverages to a diverse clientele of insurers and select reinsurers on a worldwide basis.  Platinum Holdings and its consolidated subsidiaries (collectively, the “Company”) include Platinum Holdings, Platinum Underwriters Bermuda, Ltd. (“Platinum Bermuda”), Platinum Underwriters Reinsurance, Inc. (“Platinum US”), Platinum Underwriters Finance, Inc. ("Platinum Finance"), Platinum Regency Holdings ("Platinum Regency") and Platinum Administrative Services, Inc.  The terms "we," "us," and "our" refer to the Company, unless the context otherwise indicates.

At June 30, 2012, our capital resources of $1.97 billion consisted of $1.72 billion of common shareholders’ equity and $250.0 million of Series B 7.5% Notes due June 1, 2017 (the “debt obligations”).  Our net income was $67.5 and $120.8 million for the three and six months ended June 30, 2012, respectively, which compares with a net loss of $20.4 and $177.6 million for the three and six months ended June 30, 2011, respectively.  Net income for the three and six months ended June 30, 2012 reflected net realized gains on investments of $25.0 million and $47.3 million, respectively, and net losses arising from major catastrophes of $3.5 million and $29.4 million, respectively. The net loss for the three and six months ended June 30, 2011 reflected losses from worldwide major catastrophes of $84.0 million and $332.0 million, respectively, and net realized losses on investments of $4.7 million and $4.3 million, respectively.

Our net premiums written were $141.5 million and $285.1 million for the three and six months ended June 30, 2012, respectively, and $125.9 million and $320.7 million for the three and six months ended June 30, 2011, respectively.  The decrease in net premiums written for the six months ended June 30, 2012 as compared with the same period in 2011 was primarily due to the non-renewal of business that did not meet our minimum pricing standards and our desire to reduce our exposure to catastrophe events.

Current Outlook

We anticipate that the remainder of 2012 will be characterized by ample capacity for insurance risk and that, despite the recent catastrophe events, risk adjusted pricing will be flat or marginally up in all lines of business that have not recently experienced significant losses.  There have been significant insured losses from various natural catastrophes in Chile, New Zealand, Japan, Australia, the United States and other countries in the last two and a half years, which may lead to price increases for certain loss-affected accounts.  In addition, the introduction of catastrophe model revisions that increase the expected loss costs for certain U.S. and European wind events may, over time, ultimately support increases in rates for certain U.S. and European property catastrophe contracts.  However, we believe that reinsurers generally remain well-capitalized and that competitive pressure will keep property catastrophe reinsurance rates from rising significantly absent major events in the insurance or capital markets.

We generally expect property catastrophe exposed reinsurance rates for peak zones and perils will remain reasonably attractive for the balance of 2012.  In 2012, our largest reductions in business written occurred in the catastrophe exposed business and U.S. crop classes.  We expect that our Property and Marine segment will continue to represent a large proportion of our overall book of business, which could result in significant volatility in our results of operations.

Ongoing drought conditions in the United States are the most widespread in over 50 years and have the potential to produce material losses to us under our crop reinsurance treaties.  The Company is currently unable to quantify the net loss, if any, that may arise from the drought.  The aggregate exposure to this peril under our U.S. crop treaties is currently estimated to be approximately $88.0 million.  Approximately 84% of the aggregate exposure is from excess-of-loss treaties, while the remainder is our loss exposure for proportional treaties net of premiums, commissions and brokerage.

In the Casualty segment, we currently believe competition remains strong and capacity is abundant.  While insurance rates are beginning to improve in some casualty classes, positive loss cost trends have dampened any significant improvement in profitability.  Coupled with the current low interest rate environment, this means many treaties do not meet our pricing standards.  We expect insurance and reinsurance capacity to remain abundant for the rest of 2012 constraining the potential for significant improvements in risk adjusted rates.  While we expect that select casualty reinsurance contracts may offer adequate returns, the portfolio of business we write in our Casualty segment will likely continue to decrease in 2012 as compared with 2011 unless market conditions improve beyond our current expectations. 

Reflecting a continued lack of demand for finite risk covers, we expect to write a relatively small portfolio of business in our Finite Risk segment in 2012.

Absent major events in the insurance or capital markets, we expect relative stability in overall reinsurance rate adequacy in 2012.  We will continue with our strategy to underwrite for profitability, not market share.

Critical Accounting Estimates

The preparation of consolidated financial statements in accordance with U.S. GAAP requires us to make estimates and assumptions that are inherently subjective in nature that affect the reported amounts of assets, liabilities, revenues and expenses, and related disclosures of contingent liabilities.  Actual results may differ materially from these estimates.  Our critical accounting estimates used in the preparation of our consolidated financial statements include premiums written and earned, unpaid losses and loss adjustment expenses (“LAE”), reinsurance recoverable, valuation of investments and income taxes.  In addition, estimates are used to evaluate risk transfer for assumed and ceded reinsurance transactions.  For a detailed discussion of our critical accounting estimates, please refer to Item 7, "Management's Discussion and Analysis of Financial Condition and Results of Operations," included in our 2011 Form 10-K.

- 23 -

Results of Operations

Three Months Ended June 30, 2012 as Compared with the Three Months Ended June 30, 2011

Net income (loss) and diluted earnings (loss) per common share for the three months ended June 30, 2012 and 2011 were as follows ($ and amounts in thousands, except diluted earnings (loss) per common share):

	Three Months Ended June 30,
	2012			2011			Net change
Underwriting income (loss)	$	34,412		$	(33,403	)	$	67,815
Net investment income		26,155			33,965			(7,810	)
Net realized gains (losses) on investments		24,978			(4,689	)		29,667
Net impairment losses on investments		(1,113	)		(1,666	)		553
Other revenues (expenses)		(11,005	)		(14,653	)		3,648
Income (loss) before income taxes		73,427			(20,446	)		93,873
Income tax (expense) benefit		(5,895	)		45			(5,940	)
Net income (loss)	$	67,532		$	(20,401	)	$	87,933
Weighted average shares outstanding for diluted earnings (loss) per common share		34,104			37,113			(3,009	)
Diluted earnings (loss) per common share	$	1.97		$	(0.55	)	$	2.52

The net income and diluted income per common share for the three months ended June 30, 2012 as compared with the net loss and diluted loss per common share for the three months ended June 30, 2011 was primarily due to an increase in the net underwriting result attributable to a decrease in major catastrophe activity.  In addition, there were net realized gains on investments rather than net realized losses on investments, partially offset by a decrease in net investment income and higher income taxes for the three months ended June 30, 2012 as compared with the same period in 2011.  As the three months ended June 30, 2011 resulted in a net loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation.

Underwriting Results

Underwriting income or loss and underwriting ratios measure the performance of the Company’s underwriting function.  Underwriting income or loss consists of net premiums earned less net losses and LAE and net underwriting expenses. Net underwriting expenses include net acquisition expenses and operating costs related to the underwriting operations.  Underwriting income or loss excludes revenues and expenses related to net investment income, net realized gains or losses on investments, net impairment losses on investments, net changes in fair value of derivatives, net foreign exchange gains or losses, corporate expenses not allocated to underwriting operations, interest expense and other revenues and expenses.  Underwriting ratios are calculated for net losses and LAE, net acquisition expense and net underwriting expense.  The ratios are calculated by dividing the related expense by net earned premiums.

Net favorable or unfavorable development is the development of prior years’ unpaid losses and LAE and the related impact of premiums and commissions.

Net underwriting income was $34.4 million for the three months ended June 30, 2012, which compares with a net underwriting loss of $33.4 million for the three months ended June 30, 2011.  The change in the net underwriting result was due primarily to a decrease in major catastrophes in 2012.  

Net losses arising from major catastrophes were $3.5 million and $84.0 million for the three months ended June 30, 2012 and 2011, respectively.  Net favorable development was $23.2 million and $16.4 million for the three months ended June 30, 2012 and 2011, respectively.

We conduct our worldwide reinsurance business through three operating segments: Property and Marine, Casualty and Finite Risk.  The following discussion and analysis reviews our underwriting results by operating segment.  Segment underwriting income is reconciled to the U.S. GAAP measure of income or loss before income taxes in Note 9 to the “Consolidated Financial Statements” in this Form 10-Q.  The measures we use in evaluating our operating segments should not be used as a substitute for measures determined under U.S. GAAP.

Property and Marine

The following table summarizes underwriting results and ratios for the Property and Marine segment for the three months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30,
	2012			2011			Increase (decrease)
Gross premiums written	$	61,431		$	76,642		$	(15,211	)
Ceded premiums written		(264	)		22,231			(22,495	)
Net premiums written		61,695			54,411			7,284
Net premiums earned		62,838			91,852			(29,014	)
Net losses and LAE		17,653			116,543			(98,890	)
Net acquisition expenses		8,721			12,009			(3,288	)
Other underwriting expenses		7,454			7,274			180
Property and Marine segment underwriting income (loss)	$	29,010		$	(43,974	)	$	72,984
Underwriting ratios:
Net loss and LAE		28.1	%		126.9	%	(98.8) points
Net acquisition expense		13.9	%		13.1	%	0.8 points
Other underwriting expense		11.9	%		7.9	%	4.0 points
Combined		53.9	%		147.9	%	(94.0) points

- 24 -

The Property and Marine segment underwriting result improved by $73.0 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011, primarily due to a decrease in net losses arising from major catastrophes.  Net losses arising from major catastrophes, net of reinstatement premiums and retrocessional recoveries, were $3.5 million and $84.0 million for the three months ended June 30, 2012 and 2011, respectively.  Net losses from major catastrophes for the three months ended June 30, 2012 were attributable to severe weather, including tornadoes and hailstorms in Missouri, Illinois, Kentucky, Texas and Indiana that occurred in April 2012, referred to as Property Claims Services (“PCS”) Catastrophe 74, offset by a reduction in first quarter net losses from major catastrophes from tornadoes and hailstorms primarily in Kentucky and Tennessee that occurred in March 2012, referred to as PCS Catastrophes 66 and 67.  Net losses from major catastrophes for the three months ended June 30, 2011 were attributable to U.S. tornadoes, the June New Zealand earthquake and increases in first quarter 2011 catastrophe loss estimates.  The increases in the first quarter 2011 catastrophe estimates related to the February earthquake in New Zealand, the earthquake in Japan, Australian floods and Cyclone Yasi.  Property and Marine underwriting income, excluding major catastrophes and net favorable development, was also impacted by changes in the mix of business resulting in an increase in the combined ratio.  The increase in the combined ratio was primarily due to a decrease in the proportion of catastrophe excess-of-loss business which has a lower combined ratio as compared to the other classes of business.

The Property and Marine segment generated 43.6% and 43.2% of our net premiums written for the three months ended June 30, 2012 and 2011, respectively.  Gross premiums written decreased by $15.2 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011, and decreased by $7.2 million when excluding reinstatement premiums related to major catastrophes of $0.1 million and $8.1 million for the three months ended June 30, 2012 and 2011, respectively.  The decrease in gross premiums written, excluding reinstatement premiums, was due to decreases across most classes of business, most significantly in the catastrophe excess-of-loss classes, for the three months ended June 30, 2012 as compared with the same period in 2011 and resulted from fewer opportunities that met our underwriting standards and our desire to reduce our exposure to catastrophe events.   The decrease in ceded premiums written was due to a decrease in retrocessional reinsurance purchased for the three months ended June 30, 2012 as compared with the same period in 2011.  Net premiums earned decreased by $29.0 million for the three months ended June 30, 2012 as compared with the same period in 2011, primarily as a result of decreases in net premiums written in current and prior periods.  Net premiums written and earned were also impacted by changes in the mix of business and the structure of the underlying reinsurance contracts.

Net losses and LAE decreased by $98.9 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011, primarily due to a decrease in losses arising from major catastrophes.  The following table sets forth the components of pre-tax net losses by major catastrophe for the three months ended June 30, 2012 ($ in thousands):

Major Catastrophe	Gross Losses and LAE			Retrocessional Recoveries		Net Losses and LAE			Reinstatement Premiums Earned		Net Losses from Major Catastrophes
PCS Catastrophe 74	$	(9,844	)	$	-	$	(9,844	)	$	98	$	(9,746	)
Decrease in First Quarter 2012 Catastrophe Estimates:
PCS Catastrophes 66 and 67		6,241			-		6,241			3		6,244
Total	$	(3,603	)	$	-	$	(3,603	)	$	101	$	(3,502	)

The following table sets forth the components of pre-tax net losses by major catastrophe for the three months ended June 30, 2011 ($ in thousands):

Major Catastrophe	Gross Losses and LAE			Retrocessional Recoveries		Net Losses and LAE			Reinstatement Premiums Earned		Net Losses from Major Catastrophes
U.S. tornadoes	$	(35,064	)	$	-	$	(35,064	)	$	2,836	$	(32,228	)
June New Zealand earthquake		(5,530	)		-		(5,530	)		-		(5,530	)
Increases in First Quarter 2011 Catastrophe Estimates:
February New Zealand earthquake		(35,702	)		-		(35,702	)		2,784		(32,918	)
Japan earthquake		(7,738	)		-		(7,738	)		1,108		(6,630	)
Australian floods		(4,597	)		-		(4,597	)		1,022		(3,575	)
Cyclone Yasi		(3,226	)		-		(3,226	)		133		(3,093	)
Total	$	(91,857	)	$	-	$	(91,857	)	$	7,883	$	(83,974	)

Net losses and LAE arising from major catastrophes, with related premium adjustments, increased the net loss and LAE ratio by 5.7 points and 97.4 points for the three months ended June 30, 2012 and 2011, respectively.

Net favorable loss development was $7.8 million and $5.2 million for the three months ended June 30, 2012 and 2011, respectively.  Net favorable loss development and related premium adjustments decreased the net loss and LAE ratio by 14.8 points and 4.0 points for the three months ended June 30, 2012 and 2011, respectively.  Net favorable loss development for the three months ended June 30, 2012 and 2011 was primarily attributable to a level of cumulative losses reported by our ceding companies that was lower than expected and that, in our judgment, resulted in sufficient credibility in the loss experience to change our previously selected loss ratios.

The following table sets forth the net favorable (unfavorable) development for the three months ended June 30, 2012 by class of business ($ in thousands):

Class of Business	Net Losses and LAE		Net Acquisition Expense			Net Premiums		Net Development
Catastrophe excess-of-loss (non-major events)	$	3,131	$	61		$	131	$	3,323
Major catastrophes		1,969		(9	)		1,011		2,971
Marine, aviation and satellite		220		(104	)		1,941		2,057
Property proportional		1,835		(94	)		-		1,741
Other		631		135			460		1,226
Total	$	7,786	$	(11	)	$	3,543	$	11,318

- 25 -

Net favorable development in the catastrophe excess-of-loss (non-major events) class arose primarily from the North American business in the 2011 underwriting year.  Net favorable development in the major catastrophes class arose primarily from 2008 through 2010 events.  Net favorable development in the marine, aviation and satellite class arose primarily from the 2006 through 2011 underwriting years.  Net favorable development in the property proportional class arose primarily from the North American business from the 2009 and 2010 underwriting years.

The following table sets forth the net favorable (unfavorable) development for the three months ended June 30, 2011 by class of business ($ in thousands):

Class of Business	Net Losses and LAE		Net Acquisition Expense			Net Premiums			Net Development
Catastrophe excess-of-loss (non-major events)	$	2,068	$	120		$	(245	)	$	1,943
Crop		1,138		(106	)		-			1,032
Other		1,968		195			(884	)		1,279
Total	$	5,174	$	209		$	(1,129	)	$	4,254

Net favorable development in the catastrophe excess-of-loss (non-major events) class arose primarily from North American business from the 2010 underwriting year, partially offset by unfavorable development from International business resulting from an increase in loss estimates from ceding companies related to fourth quarter 2010 events in Europe and Australia.  Net favorable development in the crop class arose primarily from North American business in the 2010 underwriting year.

Net acquisition expenses and related net acquisition expense ratios were $8.7 million and 13.9%, respectively, for the three months ended June 30, 2012 and $12.0 million and 13.1%, respectively, for the three months ended June 30, 2011.  The decrease in net acquisition expenses was primarily due to the decrease in net premiums earned as compared with the same period in 2011.  The increase in acquisition expense ratio for the three months ended June 30, 2012 as compared with the same period in 2011, was primarily due to a reduction in catastrophe excess-of-loss business which has a lower acquisition ratio than the remainder of the segment.   Net acquisition expenses and related net acquisition expense ratios were also impacted by other changes in the mix of business.

Other underwriting expenses were $7.5 million and $7.3 million for the three months ended June 30, 2012 and 2011, respectively.  The increase in 2012 as compared with 2011 was primarily attributable to higher performance-based compensation in the current year as compared to the prior year, partially offset by a reduction in headcount.

Casualty

The following table summarizes underwriting results and ratios for the Casualty segment for the three months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30,
	2012			2011			Increase (decrease)
Net premiums written	$	72,678		$	69,234		$	3,444
Net premiums earned		75,746			77,104			(1,358	)
Net losses and LAE		45,851			43,868			1,983
Net acquisition expenses		18,487			18,144			343
Other underwriting expenses		5,625			4,829			796
Casualty segment underwriting income	$	5,783		$	10,263		$	(4,480	)
Underwriting ratios:
Net loss and LAE		60.5	%		56.9	%	3.6 points
Net acquisition expense		24.4	%		23.5	%	0.9 points
Other underwriting expense		7.4	%		6.3	%	1.1 points
Combined		92.3	%		86.7	%	5.6 points

The Casualty segment underwriting income decreased by $4.5 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011.  Net favorable development was $11.7 million for each of the three months ended June 30, 2012 and 2011.  The Casualty segment had a higher combined ratio for the three months ended June 30, 2012 as compared with the same period in 2011, primarily due to the financial lines class.

- 26 -

The Casualty segment generated 51.4% and 55.0% of our net premiums written for the three months ended June 30, 2012 and 2011, respectively.  Net premiums written increased by $3.4 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011.  The net premiums written in the three months ended June 30, 2012 and 2011 were impacted by increases to prior years’ premium estimates of $13.0 million and $1.0 million, respectively.  Excluding the impact of increases to prior years’ premium estimates, net premiums written decreased by $8.6 million primarily due to fewer opportunities that met our underwriting standards.  The net premiums earned in the three months ended June 30, 2012 and 2011 were also impacted by increases to prior years’ premium estimates of $9.4 million and $0.9 million, respectively.  Excluding the impact of increases to prior years’ premium estimates, net premiums earned decreased by $7.1 million.  Net premiums earned decreased as a result of the decreases in net premiums written in current and prior periods.  Net premiums written and earned were also impacted by changes in the mix of business and the structure of the underlying reinsurance contracts.

Net losses and LAE increased by $2.0 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011.  Net favorable loss development was $11.7 million and $11.3 million for the three months ended June 30, 2012 and 2011, respectively.  Net favorable loss development and related premium adjustments decreased the net loss and LAE ratios by 16.0 points and 15.4 points for the three months ended June 30, 2012 and 2011, respectively.  Net favorable loss development for the three months ended June 30, 2012 and 2011 was primarily attributable to a level of cumulative losses reported by our ceding companies that was lower than expected and that, in our judgment, resulted in sufficient credibility in the loss experience to change our previously selected loss ratios.  The net loss and LAE ratios were also impacted by changes in the mix of business.

The following table sets forth the net favorable (unfavorable) development for the three months ended June 30, 2012 by class of business ($ in thousands):

Class of Business	Net Losses and LAE			Net Acquisition Expense			Net Premiums		Net Development
North American claims made	$	8,088		$	(825	)	$	68	$	7,331
North American umbrella		4,721			435			-		5,156
North American occurrence		1,589			(89	)		-		1,500
Accident and health		883			305			-		1,188
International casualty		(4,294	)		34			149		(4,111	)
Other		748			(405	)		322		665
Total	$	11,735		$	(545	)	$	539	$	11,729

Net favorable development in the North American claims made class arose primarily from the 2004 through 2008 underwriting years.  Net favorable development in the North American umbrella class arose primarily from the 2006 and 2007 underwriting years.  Net favorable development in the North American occurrence class arose from most prior underwriting years.  Net favorable development in the accident and health class arose primarily from the 2008 through 2010 underwriting years.  Net unfavorable development in the international casualty class arose primarily from medical malpractice contracts from the 2005 through 2007 underwriting years and liability claims arising from Australian wildfires in the 2008 underwriting year.

The following table sets forth the net favorable (unfavorable) development for the three months ended June 30, 2011 by class of business ($ in thousands):

Class of Business	Net Losses and LAE			Net Acquisition Expense			Net Premiums			Net Development
North American claims made	$	5,635		$	(600	)	$	17		$	5,052
North American umbrella		3,343			(150	)		-			3,193
Financial lines		2,433			(41	)		(4	)		2,388
North American occurrence excess-of-loss		1,977			(6	)		83			2,054
International casualty		(1,359	)		(185	)		747			(797	)
Other		(775	)		504			48			(223	)
Total	$	11,254		$	(478	)	$	891		$	11,667

Net favorable development in the North American claims made class arose primarily from the 2003 and 2004 underwriting years.  Net favorable development in the North American umbrella class arose primarily from the 2003, 2006 and 2008 underwriting years.  Net favorable development in the 2008 underwriting year resulted from improved loss experience in the current year after adverse experience led us to increase the selected loss ratio from the initial expected loss ratio in prior years.  Net favorable development in the financial lines class arose primarily from the 2004 through 2007 underwriting years in the North American surety class, with a change in the loss development patterns resulting in approximately $1.3 million of the net favorable development.  Net favorable development in the North American occurrence class arose primarily from the 2004 through 2007 underwriting years.  The net favorable development in the 2007 underwriting year resulted from improved loss experience in the current year after adverse experience led us to increase the selected loss ratio from the initial expected loss ratio in prior years.  Net unfavorable development in the international casualty class arose primarily from the 2003 and 2008 underwriting years, partially offset by favorable development in most underwriting years prior to 2008.

Net acquisition expenses and related net acquisition expense ratios were $18.5 million and 24.4%, respectively, for the three months ended June 30, 2012 and $18.1 million and 23.5%, respectively, for the three months ended June 30, 2011.  Net acquisition expenses and related net acquisition expense ratios were impacted by changes in the mix of business.

Other underwriting expenses were $5.6 million and $4.8 million for the three months ended June 30, 2012 and 2011, respectively.  The increase in 2012 as compared with 2011 was primarily attributable to higher performance-based compensation in the current year as compared to the prior year, partially offset by a reduction in headcount.

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Finite Risk

The following table summarizes underwriting results and ratios for the Finite Risk segment for the three months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30,
	2012			2011			Increase (decrease)
Net premiums written	$	7,086		$	2,242		$	4,844
Net premiums earned		6,491			3,480			3,011
Net losses and LAE		3,613			(1,054	)
Net acquisition expenses		2,992			3,962
Net losses, LAE and acquisition expenses		6,605			2,908			3,697
Other underwriting expenses		267			264			3
Finite Risk segment underwriting income (loss)	$	(381	)	$	308		$	(689	)
Underwriting ratios:
Net loss and LAE		55.7	%		(30.3	%)
Net acquisition expense		46.1	%		113.9	%
Net loss, LAE and acquisition expense		101.8	%		83.6	%	18.2 points
Other underwriting expense		4.1	%		7.6	%	(3.5) points
Combined		105.9	%		91.2	%	14.7 points

During the three months ended June 30, 2012 and 2011, the in-force Finite Risk portfolio consisted of one contract and we expect minor activity in this segment in the foreseeable future due to the relatively low level of demand for finite risk products.  Due to the inverse relationship between losses and commissions for this segment, we believe it is important to evaluate the overall combined ratio, rather than its component parts of net loss and LAE ratio and net acquisition expense ratio.  Due to the decline in premium volume in recent years, current year ratios may be significantly impacted by relatively small adjustments of prior years’ reserves.

The Finite Risk segment generated 5.0% and 1.8% of our net premiums written for the three months ended June 30, 2012 and 2011, respectively.  The increases in net premiums written and net premiums earned for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011 were primarily attributable to an increase in prior years’ premium estimates relating to the one in-force contract.

Net losses, LAE and acquisition expenses increased by $3.7 million for the three months ended June 30, 2012 as compared with the three months ended June 30, 2011, primarily due to an increase in net premiums earned and a decrease in net favorable development.  Net favorable development was $0.1 million and $0.5 million for the three months ended June 30, 2012 and 2011, respectively.  The net favorable development decreased the net loss, LAE and acquisition expense ratio by 2.0 points and 13.2 points for the three months ended June 30, 2012 and 2011, respectively.  In addition, a change in underwriting conditions resulted in an increase in the loss and loss adjustment expense ratio for the current period.

Non-Underwriting Results

Net Investment Income

Net investment income was $26.2 million and $34.0 million for the three months ended June 30, 2012 and 2011, respectively.  Net investment income decreased during the three months ended June 30, 2012, as compared with the same period in 2011, as a result of a reduction in average investable assets and a decrease in average yields for the portfolio from 3.3% in the second quarter of 2011 to 2.7% in the second quarter of 2012.  The decrease in average yields is attributable to the sales, maturities and paydowns of investments that were primarily reinvested into cash equivalents.

Net Realized Gains (Losses) on Investments

Net realized gains on investments were $25.0 million for the three months ended June 30, 2012 and net realized losses on investments were $4.7 million for the three months ended June 30, 2011.  Sales of investments resulted in net realized gains of $25.3 million for the three months ended June 30, 2012 and included $21.2 million of net realized gains from the sale of municipal bonds and $3.0 million of net realized gains from the sale of corporate bonds.  The net losses from mark-to-market adjustments on trading securities of $0.3 million for the three months ended June 30, 2012 were related to non-U.S. government securities.  Sales of investments resulted in net realized losses of $6.4 million for the three months ended June 30, 2011, primarily from U.S. Government securities.  The net gains from mark-to-market adjustments on trading securities of $1.7 million for the three months ended June 30, 2011 were related primarily to non-U.S. government securities.

Net Impairment Losses on Investments

Net impairment losses on investments were $1.1 million and $1.7 million for the three months ended June 30, 2012 and 2011, respectively.  The net impairment losses reflect other-than-temporary impairments attributable to credit losses on impaired securities that relate exclusively to investments in securitized mortgages not guaranteed by U.S. government agencies.  The net impairment losses recorded for the three months ended June 30, 2012 related substantially all to non-agency residential mortgage-backed securities (“RMBS”).  The net impairment losses recorded for the three months ended June 30, 2011 included $1.5 million related to non-agency RMBS and $0.2 million related to sub-prime asset-backed securities (“ABS”).

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Net Changes in Fair Value of Derivatives

There were no net changes in the fair value of derivatives for the three months ended June 30, 2012 as we did not hold any derivatives during the period from April 1, 2012 to June 30, 2012.  Net changes in the fair value of derivatives resulted in an expense of $4.5 million for the three months ended June 30, 2011 and was related to a decrease in the fair value of a derivative agreement with Topiary Capital Limited that was used to manage our exposure to certain underwriting risks until it expired on July 31, 2011.

Operating Expenses

Non-underwriting operating expenses were $6.3 million and $4.7 million for the three months ended June 30, 2012 and 2011, respectively, and related to costs such as compensation and other corporate expenses associated with operating as a publicly-traded company.  The increase during the three months ended June 30, 2012 as compared with the same period in 2011 was primarily attributable to higher performance-based compensation in the current year as compared to the prior year.

Interest Expense

Interest expense was $4.8 million for both the three months ended June 30, 2012 and 2011 and related to our $250.0 million of debt obligations.

Income Taxes

Income tax expense was $5.9 million for the three months ended June 30, 2012 and income tax benefit was less than $0.1 million for the three months ended June 30, 2011.  Our effective tax rate was 8.0% and (0.2%) for the three months ended June 30, 2012 and 2011, respectively.  Income tax expense or benefit is primarily driven by the taxable income or loss generated by our U.S.-based subsidiaries.  The income tax expense or benefit rate is driven by the portion of taxable income or loss generated by our U.S.-based subsidiaries relative to the income or loss generated by our Bermuda-based operations, which are not subject to corporate income tax.  Premiums earned by our U.S. and Bermuda-based subsidiaries generally do not bear a proportionate relationship to their respective pre-tax income for a variety of reasons, including the significant impact on pre-tax income of the different mixes of business underwritten by the particular subsidiary, the presence or absence of underwriting income or loss attributable to such business, and the investment results experienced by the particular subsidiary.

Pre-tax income was $55.9 million and $17.7 million in our Bermuda and U.S. companies, respectively, for the three months ended June 30, 2012.  Pre-tax loss was $22.2 million in our Bermuda companies and pre-tax income was $1.8 million in our U.S. companies for the three months ended June 30, 2011.

Six Months Ended June 30, 2012 as Compared with the Six Months Ended June 30, 2011

Net income (loss) and diluted earnings (loss) per common share for the six months ended June 30, 2012 and 2011 were as follows ($ and amounts in thousands, except diluted earnings (loss) per common share):

	Six Months Ended June 30,
	2012			2011			Net change
Underwriting income (loss)	$	50,709		$	(216,955	)	$	267,664
Net investment income		54,707			66,343			(11,636	)
Net realized gains (losses) on investments		47,317			(4,282	)		51,599
Net impairment losses on investments		(2,183	)		(3,173	)		990
Other revenues (expenses)		(21,709	)		(19,049	)		(2,660	)
Income (loss) before income taxes		128,841			(177,116	)		305,957
Income tax expense		(8,022	)		(477	)		(7,545	)
Net income (loss)	$	120,819		$	(177,593	)	$	298,412
Weighted average shares outstanding for diluted earnings (loss) per common share		34,805			37,155			(2,350	)
Diluted earnings (loss) per common share	$	3.46		$	(4.75	)	$	8.21

The net income and diluted income per common share for the six months ended June 30, 2012 as compared with the net loss and diluted loss per common share for the six months ended June 30, 2011 was primarily due to an increase in the net underwriting result attributable to a significant decrease in major catastrophe activity.  In addition, there were net realized gains on investments rather than net realized losses on investments, partially offset by a decrease in net investment income and higher income taxes, for the six months ended June 30, 2012 as compared with the same period in 2011.  As the six months ended June 30, 2011 resulted in a net loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation.

Underwriting Results

Net underwriting income was $50.7 million for the six months ended June 30, 2012, which compares with a net underwriting loss of $217.0 million for the six months ended June 30, 2011.  The change in the net underwriting result was due primarily to a significant decrease in net losses arising from major catastrophes in 2012.  

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Net losses arising from major catastrophes were $29.4 million and $332.0 million for the six months ended June 30, 2012 and 2011, respectively.  Net favorable development was $51.0 million and $49.5 million for the six months ended June 30, 2012 and 2011, respectively.

Property and Marine

The following table summarizes underwriting results and ratios for the Property and Marine segment for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30,
	2012			2011			Increase (decrease)
Gross premiums written	$	129,975		$	200,456		$	(70,481	)
Ceded premiums written		127			34,243			(34,116	)
Net premiums written		129,848			166,213			(36,365	)
Net premiums earned		124,166			189,757			(65,591	)
Net losses and LAE		58,590			394,873			(336,283	)
Net acquisition expenses		17,956			25,635			(7,679	)
Other underwriting expenses		14,289			14,595			(306	)
Property and Marine segment underwriting income (loss)	$	33,331		$	(245,346	)	$	278,677
Underwriting ratios:
Net loss and LAE		47.2	%		208.1	%	(160.9) points
Net acquisition expense		14.5	%		13.5	%	1.0 points
Other underwriting expense		11.5	%		7.7	%	3.8 points
Combined		73.2	%		229.3	%	(156.1) points

The Property and Marine segment underwriting result improved by $278.7 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011, primarily due to a decrease in net losses arising from major catastrophes.  Net losses arising from major catastrophes, net of reinstatement premiums and retrocessional recoveries, were $29.4 million and $332.0 million for the six months ended June 30, 2012 and 2011, respectively.  Net losses from major catastrophes for the six months ended June 30, 2012 were substantially all attributable to severe weather, including tornadoes and hailstorms primarily in Kentucky and Tennessee that occurred in March 2012, referred to as PCS Catastrophes 66 and 67, and tornadoes and hailstorms in Missouri, Illinois, Kentucky, Texas and Indiana that occurred in April 2012, referred to as PCS Catastrophe 74.  Net losses from major catastrophes for the six months ended June 30, 2011 related primarily to the February and June earthquakes in New Zealand, the earthquake in Japan, U.S. tornadoes, Australian floods and Cyclone Yasi.  Property and Marine underwriting income, excluding major catastrophes and net favorable development, was also impacted by changes in the mix of business resulting in an increase in the combined ratio.  The increase in the combined ratio was primarily due to a decrease in the proportion of catastrophe excess-of-loss business which has a lower combined ratio as compared to the other classes of business.

The Property and Marine segment generated 45.5% and 51.8% of our net premiums written for the six months ended June 30, 2012 and 2011, respectively.  Gross premiums written decreased by $70.5 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011, and by $53.4 million when considering reinstatement premiums related to major catastrophes of $2.4 million and $19.5 million for the six months ended June 30, 2012 and 2011, respectively.  The decrease in gross premiums written, excluding reinstatement premiums, was due to decreases across most classes of business, most significantly in the catastrophe excess-of-loss classes, for the six months ended June 30, 2012 as compared with the same period in 2011 and resulted from fewer opportunities that met our underwriting standards and our desire to reduce our exposure to catastrophe events.   The decrease in ceded premiums written was due to a decrease in retrocessional reinsurance purchased for the six months ended June 30, 2012 as compared with the same period in 2011.  Net premiums earned decreased by $65.6 million for the six months ended June 30, 2012 as compared with the same period in 2011, primarily as a result of decreases in net premiums written in current and prior periods.  Net premiums written and earned were also impacted by changes in the mix of business and the structure of the underlying reinsurance contracts.

Net losses and LAE decreased by $336.3 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011, primarily due to a decrease in losses arising from major catastrophes.  The following table sets forth the components of pre-tax net losses by major catastrophe for the six months ended June 30, 2012 ($ in thousands):

Major Catastrophe	Gross Losses and LAE			Retrocessional Recoveries		Net Losses and LAE			Reinstatement Premiums Earned		Net Losses from Major Catastrophes
PCS Catastrophes 66 and 67	$	(21,802	)	$	-	$	(21,802	)	$	2,171	$	(19,631	)
PCS Catastrophe 74		(9,844	)		-		(9,844	)		98		(9,746	)
Total	$	(31,646	)	$	-	$	(31,646	)	$	2,269	$	(29,377	)

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The following table sets forth the components of pre-tax net losses by major catastrophe for the six months ended June 30, 2011 ($ in thousands):

Major Catastrophe	Gross Losses and LAE			Retrocessional Recoveries		Net Losses and LAE			Reinstatement Premiums Earned		Net Losses from Major Catastrophes
February New Zealand earthquake	$	(177,173	)	$	-	$	(177,173	)	$	7,341	$	(169,832	)
Japan earthquake		(133,944	)		35,000		(98,944	)		5,752		(93,192	)
U.S. tornadoes		(35,064	)		-		(35,064	)		2,836		(32,228	)
Australian floods		(20,201	)		-		(20,201	)		1,776		(18,425	)
Cyclone Yasi		(14,335	)		-		(14,335	)		1,515		(12,820	)
June New Zealand earthquake		(5,530	)		-		(5,530	)		-		(5,530	)
Total	$	(386,247	)	$	35,000	$	(351,247	)	$	19,220	$	(332,027	)

During the course of 2011, the Company increased its estimates of pre-tax net losses from major catastrophes for the six months ended June 30, 2011.  At December 31, 2011, the Company’s estimates of pre-tax net losses were $208.5 million for the February New Zealand earthquake, $143.6 million for the Japan earthquake, $43.0 million for the U.S. tornadoes, $16.5 million for the Australian floods, $13.5 million for Cyclone Yasi, and $33.7 million for the June New Zealand earthquake.   For the six months ended June 30, 2012, there was no material impact to net development from major catastrophe events that occurred in 2011.

Net losses and LAE arising from major catastrophes, with related premium adjustments, increased the net loss and LAE ratio by 25.1 points and 182.5 points for six months ended June 30, 2012 and 2011, respectively.

Net favorable loss development was $18.5 million and $17.4 million for six months ended June 30, 2012 and 2011, respectively.  Net favorable loss development and related premium adjustments decreased the net loss and LAE ratio by 17.2 points and 8.7 points for the six months ended June 30, 2012 and 2011, respectively.  Net favorable loss development for the six months ended June 30, 2012 and 2011 was primarily attributable to a level of cumulative losses reported by our ceding companies that was lower than expected and that, in our judgment, resulted in sufficient credibility in the loss experience to change our previously selected loss ratios.

The following table sets forth the net favorable (unfavorable) development for the six months ended June 30, 2012 by class of business ($ in thousands):

Class of Business	Net Losses and LAE		Net Acquisition Expense			Net Premiums		Net Development
Property per risk excess-of-loss	$	6,350	$	(24	)	$	1,336	$	7,662
Catastrophe excess-of-loss (non-major events)		5,780		(8	)		276		6,048
Major catastrophes		2,290		(24	)		678		2,944
Marine, aviation and satellite		734		(104	)		2,195		2,825
Property proportional		2,851		(153	)		-		2,698
Other		484		6			-		490
Total	$	18,489	$	(307	)	$	4,485	$	22,667

Net favorable development in the property per risk excess-of-loss class arose from most prior underwriting years.  Net favorable development in the catastrophe excess-of-loss (non-major events) class arose primarily from the North American business in the 2011 underwriting year.  Net favorable development in the major catastrophes class arose primarily from 2008 and 2009 events.  Net favorable development in the marine, aviation and satellite class arose primarily from the 2006 through 2011 underwriting years.  Net favorable development in the property proportional class arose primarily from most prior underwriting years.

The following table sets forth the net favorable (unfavorable) development for the six months ended June 30, 2011 by class of business ($ in thousands):

Class of Business	Net Losses and LAE			Net Acquisition Expense			Net Premiums			Net Development
Major catastrophes	$	14,421		$	(8	)	$	(327	)	$	14,086
Property per risk excess-of-loss		6,714			256			175			7,145
Property proportional		4,051			(53	)		-			3,998
Crop		1,817			(120	)		-			1,697
Catastrophe excess-of-loss (non-major events)		(9,810	)		(71	)		(407	)		(10,288	)
Other		215			(8	)		162			369
Total	$	17,408		$	(4	)	$	(397	)	$	17,007

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Net favorable development in the major catastrophes class arose primarily from the September 2010 earthquake in New Zealand and the December 2010 floods in Australia.  Net favorable development in the property per risk excess-of-loss class arose primarily from the North American business from the 2003 and 2007 through 2010 underwriting years.  Net favorable development in the property proportional class arose primarily from the 2008 and 2009 underwriting years. Net favorable development in the crop class arose primarily from North American business in the 2010 underwriting year.  Net unfavorable development in the catastrophe excess-of-loss (non-major events) class arose primarily from an increase in loss estimates from ceding companies related to fourth quarter 2010 events in Europe and Australia, partially offset by North American and international business prior to 2010.

Net acquisition expenses and related net acquisition expense ratios were $18.0 million and 14.5%, respectively, for the six months ended June 30, 2012 and $25.6 million and 13.5%, respectively, for the six months ended June 30, 2011.  The decrease in net acquisition expenses was primarily due to the decrease in net premiums earned as compared with the same period in 2011.  The increase in the acquisition expense ratio for the six months ended June 30, 2012 as compared with the same period in 2011 was primarily due to a reduction in catastrophe excess-of-loss business which has a lower acquisition ratio than the remainder of the segment.   Net acquisition expenses and related net acquisition expense ratios were also impacted by other changes in the mix of business.

Other underwriting expenses were $14.3 million and $14.6 million for the six months ended June 30, 2012 and 2011, respectively.  The decrease in 2012 as compared with 2011 was primarily attributable to a reduction in headcount partially offset by higher performance-based compensation in the current year as compared to the prior year.

Casualty

The following table summarizes underwriting results and ratios for the Casualty segment for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30,
	2012			2011			Increase (decrease)
Net premiums written	$	147,078		$	149,753		$	(2,675	)
Net premiums earned		151,512			157,928			(6,416	)
Net losses and LAE		86,887			83,487			3,400
Net acquisition expenses		35,862			36,707			(845	)
Other underwriting expenses		10,661			10,161			500
Casualty segment underwriting income	$	18,102		$	27,573		$	(9,471	)
Underwriting ratios:
Net loss and LAE		57.3	%		52.9	%	4.4 points
Net acquisition expense		23.7	%		23.2	%	0.5 points
Other underwriting expense		7.0	%		6.4	%	0.6 points
Combined		88.0	%		82.5	%	5.5 points

The Casualty segment underwriting income decreased by $9.5 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011.  Net favorable development was $28.3 million and $31.4 million for the six months ended June 30, 2012 and 2011, respectively.  The Casualty segment had a higher combined ratio for the six months ended June 30, 2012 as compared with the same period in 2011, primarily due to the financial lines class.

The Casualty segment generated 51.6% and 46.7% of our net premiums written for the six months ended June 30, 2012 and 2011, respectively.  Net premiums written decreased by $2.7 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011.  The net premiums written in the six months ended June 30, 2012 and 2011 were impacted by increases to prior years’ premium estimates of $25.1 million and $8.3 million, respectively.  Excluding the impact of increases to prior years’ premium estimates, net premiums written decreased by $19.5 million primarily due to fewer opportunities that met our underwriting standards.  The net premiums earned in the six months ended June 30, 2012 and 2011 were also impacted by increases to prior years’ premium estimates of $18.1 million and $4.8 million, respectively.  Excluding the impact of increases to prior years’ premium estimates, net premiums earned decreased by $19.7 million.  Net premiums earned decreased as a result of the decreases in net premiums written in current and prior periods.  Net premiums written and earned were also impacted by changes in the mix of business and the structure of the underlying reinsurance contracts.

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Net losses and LAE increased by $3.4 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011, primarily due to a decrease in net favorable loss development.  Net favorable loss development was $27.7 million and $30.8 million for the six months ended June 30, 2012 and 2011, respectively.  Net favorable loss development and related premium adjustments decreased the net loss and LAE ratios by 19.1 points and 19.7 points for the six months ended June 30, 2012 and 2011, respectively.  Net favorable loss development for the six months ended June 30, 2012 and 2011 was primarily attributable to a level of cumulative losses reported by our ceding companies that was lower than expected and that, in our judgment, resulted in sufficient credibility in the loss experience to change our previously selected loss ratios.  The net loss and LAE ratios were also impacted by changes in the mix of business.

The following table sets forth the net favorable (unfavorable) development for the six months ended June 30, 2012 by class of business ($ in thousands):

Class of Business	Net Losses and LAE			Net Acquisition Expense			Net Premiums		Net Development
North American claims made	$	20,586		$	(1,384	)	$	739	$	19,941
North American umbrella		10,612			426			-		11,038
North American occurrence		4,421			(144	)		19		4,296
Accident and health		917			420			-		1,337
International casualty		(7,929	)		36			153		(7,740	)
Other		(879	)		(314	)		648		(545	)
Total	$	27,728		$	(960	)	$	1,559	$	28,327

Net favorable development in the North American claims made class arose primarily from the 2003 through 2008 underwriting years.  Net favorable development in the North American umbrella class arose primarily from the 2003 through 2007 underwriting years.  Net favorable development in the North American occurrence class arose primarily from the 2007 underwriting year.  Net favorable development in the accident and health class arose primarily from the 2008 through 2010 underwriting years.  Net unfavorable development in the international casualty class arose primarily from the 2006, 2008 and 2010 underwriting years. The 2006 underwriting year was impacted by medical malpractice claims. The 2008 underwriting year was impacted by claims related to the credit crisis arising from the financial institutions business and liability arising from Australian wildfires. The 2010 underwriting year was impacted by a claim related to a power plant in Thailand.

The following table sets forth the net favorable (unfavorable) development for the six months ended June 30, 2011 by class of business ($ in thousands):

Class of Business	Net Losses and LAE			Net Acquisition Expense			Net Premiums			Net Development
North American claims made	$	19,722		$	(963	)	$	17		$	18,776
North American umbrella		7,809			(161	)		-			7,648
North American occurrence excess-of-loss		4,548			188			179			4,915
Financial lines		3,173			(110	)		(48	)		3,015
Accident and health		(3,253	)		1,151			-			(2,102	)
Other		(1,190	)		(7	)		334			(863	)
Total	$	30,809		$	98		$	482		$	31,389

Net favorable development in the North American claims made class arose primarily from the 2003 through 2007 underwriting years.  Net favorable development in the North American umbrella class arose primarily from the 2006 and 2008 underwriting years.  The net favorable development in the 2008 underwriting year resulted from improved loss experience in the current year after adverse experience led us to increase the selected loss ratio from the initial expected loss ratio in prior years.  Net favorable development in the North American occurrence excess-of-loss class arose primarily from the 2005 underwriting year.  Net favorable development in the financial lines class arose primarily from the 2004 through 2007 underwriting years on the North American surety class, with a change in the loss development patterns resulting in approximately $1.3 million of the net favorable development.  Net unfavorable development in the accident and health class arose primarily from the 2004 through 2006 underwriting years.

Net acquisition expenses and related net acquisition expense ratios were $35.9 million and 23.7%, respectively, for the six months ended June 30, 2012 and $36.7 million and 23.2%, respectively, for the six months ended June 30, 2011.  Net acquisition expenses and related net acquisition expense ratios were impacted by changes in the mix of business.

Other underwriting expenses were $10.7 million and $10.2 million for the six months ended June 30, 2012 and 2011, respectively.  The increase in 2012 as compared with 2011 was primarily attributable to higher performance-based compensation in the current year as compared to the prior year partially offset by a reduction in headcount.

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Finite Risk

The following table summarizes underwriting results and ratios for the Finite Risk segment for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30,
	2012			2011			Increase (decrease)
Net premiums written	$	8,194		$	4,706		$	3,488
Net premiums earned		7,609			7,632			(23	)
Net losses and LAE		836			592
Net acquisition expenses		7,039			5,723
Net losses, LAE and acquisition expenses		7,875			6,315			1,560
Other underwriting expenses		458			499			(41	)
Finite Risk segment underwriting income (loss)	$	(724	)	$	818		$	(1,542	)
Underwriting ratios:
Net loss and LAE		11.0	%		7.8	%
Net acquisition expense		92.5	%		75.0	%
Net loss, LAE and acquisition expense		103.5	%		82.8	%	20.7 points
Other underwriting expense		6.0	%		6.5	%	(0.5) points
Combined		109.5	%		89.3	%	20.2 points

During the six months ended June 30, 2012 and 2011, the in-force Finite Risk portfolio consisted of one contract and we expect minor activity in this segment in the foreseeable future due to the relatively low level of demand for finite risk products.

The Finite Risk segment generated 2.9% and 1.5% of our net premiums written for the six months ended June 30, 2012 and 2011, respectively.  The net premiums written increased by $3.5 million for the six months ended June 30, 2012 as compared to the six months ended June 30, 2011.  The increase in net premiums written was primarily attributable to an increase in prior years’ premium estimates relating to the one in-force contract.

Net losses, LAE and acquisition expenses increased by $1.6 million for the six months ended June 30, 2012 as compared with the six months ended June 30, 2011, primarily due to a decrease in net development.  There was less than $0.1 million of net favorable development for the six months ended June 30, 2012 and net favorable development was $1.1 million for the six months ended June 30, 2011.  The net favorable development decreased the net loss, LAE and acquisition expense ratio by 0.3 points and 14.2 points for the six months ended June 30, 2012 and 2011, respectively.  In addition, a change in underwriting conditions resulted in an increase in the loss and loss adjustment expense ratio for the current period.

Non-Underwriting Results

Net Investment Income

Net investment income was $54.7 million and $66.3 million for the six months ended June 30, 2012 and 2011, respectively.  Net investment income decreased during the six months ended June 30, 2012, as compared with the same period in 2011, as a result of a reduction in average investable assets and a decrease in average yields for the portfolio from 3.3% in 2011 to 2.8% in 2012.  The decrease in average yields is attributable to the sales, maturities and paydowns of investments that were primarily reinvested into cash equivalents.

Net Realized Gains (Losses) on Investments

Net realized gains on investments were $47.3 million for the six months ended June 30, 2012 and net realized losses on investments were $4.3 million for the six months ended June 30, 2011.  Sales of investments resulted in net realized gains of $47.9 million for the six months ended June 30, 2012 and included $41.3 million of net realized gains from the sale of municipal bonds, $4.6 million of net realized gains from the sale of corporate bonds and $1.0 million from the sale of commercial mortgage-backed securities (“CMBS”).  The net losses from mark-to-market adjustments on trading securities of $0.6 million for the six months ended June 30, 2012 were related to non-U.S government securities.  Sales of investments resulted in net realized losses of $2.5 million for the six months ended June 30, 2011, primarily from realized losses from U.S. Government securities, partially offset by realized gains from corporate bonds.  The net losses from mark-to-market adjustments on trading securities of $1.8 million for the six months ended June 30, 2011 were related primarily to insurance-linked securities.

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Net Impairment Losses on Investments

Net impairment losses on investments were $2.2 million and $3.2 million for the six months ended June 30, 2012 and 2011, respectively.  The net impairment losses reflect other-than-temporary impairments attributable to credit losses on impaired securities that relate exclusively to investments in securitized mortgages not guaranteed by U.S. government agencies.  The net impairment losses recorded for the six months ended June 30, 2012 related substantially all to non-agency RMBS.  The net impairment losses recorded for the six months ended June 30, 2011 included $2.4 million related to non-agency RMBS and $0.8 million related to sub-prime ABS.

Net Changes in Fair Value of Derivatives

There were no net changes in the fair value of derivatives for the six months ended June 30, 2012 as we did not hold any derivatives during the period from December 31, 2011 to June 30, 2012.  Net changes in the fair value of derivatives resulted in expense of $0.7 million for the six months ended June 30, 2011 and was related to a decrease in the fair value of a derivative agreement with Topiary Capital Limited that was used to manage our exposure to certain underwriting risks until it expired on July 31, 2011.

Operating Expenses

Non-underwriting operating expenses were $11.3 million and $9.0 million for the six months ended June 30, 2012 and 2011, respectively, and related to costs such as compensation and other corporate expenses associated with operating as a publicly-traded company.  The increase during the six months ended June 30, 2012 as compared with the same period in 2011 was primarily attributable to higher performance-based compensation in the current year as compared to the prior year.

Interest Expense

Interest expense was $9.5 million for both the six months ended June 30, 2012 and 2011 and related to our $250.0 million of debt obligations.

Income Taxes

Income tax expense was $8.0 million and $0.5 million for the six months ended June 30, 2012 and 2011, respectively.  Our effective tax rate was 6.2% and (0.3%) for the six months ended June 30, 2012 and 2011, respectively.  Income tax expense or benefit is primarily driven by the taxable income or loss generated by our U.S.-based subsidiaries.  The income tax expense or benefit rate is driven by the portion of taxable income or loss generated by our U.S.-based subsidiaries relative to the income or loss generated by our Bermuda-based operations, which are not subject to corporate income tax.  Premiums earned by our U.S. and Bermuda-based subsidiaries generally do not bear a proportionate relationship to their respective pre-tax income for a variety of reasons, including the significant impact on pre-tax income of the different mixes of business underwritten by the particular subsidiary, the presence or absence of underwriting income or loss attributable to such business, and the investment results experienced by the particular subsidiary.

Pre-tax income was $95.5 million and $33.6 million in our Bermuda and U.S. companies, respectively for the six months ended June 30, 2012.  Pre-tax loss was $186.6 million in our Bermuda companies and pre-tax income was $8.3 million in our U.S. companies for the six months ended June 30, 2011.

Financial Condition

The following discussion of financial condition, liquidity and capital resources as of June 30, 2012 focuses only on material changes from December 31, 2011.  See Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Financial Condition,” in our 2011 Form 10-K.

Liquidity

Liquidity Requirements

Platinum Holdings is a holding company, the assets of which consist primarily of shares of its subsidiaries.  Platinum Holdings depends primarily on its available cash resources and liquid investments and dividends and other distributions from its subsidiaries to meet its obligations.  Such obligations, and those of Platinum Finance, may include operating expenses, debt service obligations and income taxes.  We believe that Platinum Holdings has sufficient cash resources and its subsidiaries have available dividend capacity to service our current outstanding obligations.  Our reinsurance subsidiaries’ principal cash requirements are the payment of losses and LAE, commissions, brokerage, operating expenses, income taxes and dividends to Platinum Holdings.  We consider the impact of dividends and other distributions from our reinsurance subsidiaries on their respective capital levels, which may impact the financial strength rating assigned to our subsidiaries by A.M. Best Company, Inc. ("A.M. Best") and Standard & Poor's Ratings Services ("S&P").

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Platinum Bermuda is not licensed, approved or accredited as a reinsurer in the United States and, therefore, under the terms of most of its contracts with U.S. ceding companies, it is required to provide collateral to its ceding companies for unpaid losses and LAE and unearned premiums in a form acceptable to state insurance commissioners.  Typically, this type of collateral takes the form of letters of credit issued by a bank, the establishment of a trust, or funds withheld.  See “Sources of Liquidity – Credit Facilities” below for additional information on our bank credit facilities and the collateral required by us.

Platinum Bermuda and Platinum US have reinsurance and other contracts that also require them to provide collateral to ceding companies should certain events occur, such as a decline in our financial strength rating by A.M. Best or S&P below specified levels or a decline in statutory equity below specified amounts, or when certain levels of assumed liabilities are attained.  Some reinsurance contracts also have special termination provisions that permit early termination should certain events occur. As of June 30, 2012 and December 31, 2011, we held investments with a carrying value of $56.9 million and $61.1 million, respectively, and cash and cash equivalents of $10.2 million and $9.3 million, respectively, in trust to collateralize obligations under various reinsurance contracts.

The laws and regulations of Bermuda and the United States include certain restrictions on the amount of dividends that can be paid by Platinum Bermuda and Platinum US to their respective parent companies, Platinum Holdings and Platinum Finance, without the prior approval of the relevant regulatory authorities.  Based on regulatory restrictions, the maximum amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval is as follows ($ in thousands):

Platinum Bermuda	$	286,574
Platinum US		52,992
Total	$	339,566

During the six months ended June 30, 2012, dividends of $70.0 million were paid by Platinum Bermuda to Platinum Holdings.  Therefore, as of June 30, 2012, the remaining amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval was $269.6 million.  Subsequent to June 30, 2012, Platinum Bermuda declared and paid a dividend of $50.0 million to Platinum Holdings.

There are no regulatory restrictions on the amount of dividends that Platinum Finance can pay to Platinum Regency. Irish law prohibits Platinum Regency from declaring a dividend to Platinum Holdings unless it has “profits available for distribution.”  The determination of whether a company has profits available for distribution is based on its accumulated realized profits less its accumulated realized losses.

Platinum Holdings fully and unconditionally guarantees the outstanding $250.0 million debt obligations of Platinum Finance.  Platinum Finance pays interest at a rate of 7.5% per annum on each June 1 and December 1.

Platinum Holdings also may require cash to pay for share repurchases.  See “Capital Resources - Share and Debt Repurchases” below for additional discussion of share repurchases.

Sources of Liquidity

Our sources of funds consist primarily of cash and cash equivalents held by us, cash from operations, proceeds from sales, redemption and maturity of investments, borrowings from our credit facilities and the issuance of securities.  As at June 30, 2012, we had cash and cash equivalents of $1.47 billion and Platinum Holdings had cash and cash equivalents of $17.7 million.  We expect that our liquidity needs for the next twelve months will be met by our cash and cash equivalents, cash flows from operations, investment income and proceeds from the sale, redemption or maturity of our investments.

Cash Flows

Net cash flows used in operating activities were $59.2 million for the six months ended June 30, 2012 and net cash flows provided by operating activities were $33.3 million for the six months ended June 30, 2011.  Cash flows used in operating activities resulted primarily from an increase in the payment of losses and LAE and a reduction in premium volume in the six months ended June 30, 2012 as compared with the same period in 2011.  Our reinsurance subsidiaries have liquidity from premiums, which are generally received 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.  However, due to the nature of our reinsurance operations, cash flows are affected by claim payments that can fluctuate from year to year.  The amount and timing of actual claim payments can vary based on many factors, including the severity of individual losses, changes in the legal environment, and general market conditions.  As a result of expected loss payments resulting from major catastrophe activity that occurred in the last two and a half years, we anticipate that our future operating cash flows will be negative for at least the next 12 months.

Net cash flows provided by investing activities were $832.3 million and $368.5 million for the six months ended June 30, 2012 and 2011, respectively.  In 2012 and 2011, net cash flows provided by investing activities were primarily due to sales and maturities of short-term investments and fixed maturity available-for-sale securities, partially offset by the acquisition of fixed maturity available-for-sale securities and short-term investments.  In 2012, we increased our cash balance from investing activities as a result of numerous factors including the expected loss payments resulting from major catastrophe activity that occurred in the last two and a half years and in order to manage the overall duration of our investment portfolio.

Net cash flows used in financing activities were $94.4 million and $86.6 million for the six months ended June 30, 2012 and 2011, respectively.  Net cash flows used in financing activities in 2012 primarily related to repurchases of common shares of $89.9 million and the payment of dividends to common shareholders of $5.5 million.  Net cash flows used in financing activities in 2011 primarily related to repurchases of common shares and the purchase of common share options totaling $81.8 million and the payment of dividends to common shareholders of $5.9 million.

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Investments

Our investable assets totaled $4.08 billion and $4.20 billion at June 30, 2012 and December 31, 2011, respectively.  Investable assets include investments, cash and cash equivalents, accrued investment income and net balances due to and from brokers and had a duration of 3.1 and 3.6 years as of June 30, 2012 and December 31, 2011, respectively.

As part of our investment strategy, we seek to establish a level of cash and liquid short-term and intermediate-term securities which, combined with expected cash flows from our operating activities, we believe to be adequate to meet our foreseeable payment obligations.  The ultimate amount and timing of claim payments could differ materially from our estimates and create significant variations in cash flows from operations between periods, which may require us to make payments from other sources of liquidity, such as sales of investments, borrowings from credit facilities or proceeds from capital market transactions.  If we need to sell investments to meet liquidity requirements, the sale of such investments may be at a material loss.

Our investment portfolio consists primarily of diversified, high quality, predominantly investment grade fixed maturity securities.  See Note 3 to the “Consolidated Financial Statements” in this Form 10-Q for additional discussion of fair values.  The following table sets forth the fair values, net unrealized gains and losses and credit quality of our investments as of June 30, 2012 ($ in thousands):

	Fair Value		Net Unrealized Gain (Loss)			Credit Quality
Fixed maturity available-for-sale securities:
U.S. Government	$	5,011	$	344		Aaa
U.S. Government agencies		10,164		161		Aaa
Municipal bonds:
State general obligation bonds		756,621		83,273		Aa2
Essential service bonds		315,760		31,738		Aa3
State income tax and sales tax bonds		138,844		20,758		Aa1
Other municipal bonds		108,470		10,075		Aa2
Pre-refunded bonds		33,142		2,167		Aa3
Subtotal		1,352,837		148,011		Aa2
Non-U.S. governments		94,295		1,347		Aa1
Corporate bonds:
Industrial		209,989		10,142		Baa1
Utilities		84,267		5,491			A3
Insurance		48,555		3,212		Baa1
Finance		7,591		694		Baa1
Subtotal		350,402		19,539		Baa1
Commercial mortgage-backed securities		201,356		12,567		Aa2
Residential mortgage-backed securities:
U.S. Government agency residential mortgage-backed securities		229,079		1,957		Aaa
Non-agency residential mortgage-backed securities		42,399		(8,648	)	Caa2
Alt-A residential mortgage-backed securities		4,804		(274	)	Caa2
Subtotal		276,282		(6,965	)	Aa3
Asset-backed securities:
Asset-backed securities		13,237		(363	)	Aaa
Sub-prime asset-backed securities		6,403		(2,320	)		C
Subtotal		19,640		(2,683	)		A3
Total fixed maturity available-for-sale securities		2,309,987		172,321		Aa3
Fixed maturity trading securities:
Non-U.S. governments		113,847		n/a		Aaa
Total fixed maturity trading securities		113,847		n/a		Aaa
Short-term investments:
Available-for-sale		62,352		(173	)	Aaa
Trading		105,426		n/a		Aaa
Total short-term investments		167,778		(173	)	Aaa
Total investments	$	2,591,612	$	172,148		Aa3

As of June 30, 2012, our investments had a dollar weighted average rating of Aa3, primarily measured by Moody’s Investor Services ("Moody's").  If a particular security did not have a Moody’s rating then a rating from S&P was generally converted to a Moody’s equivalent rating.

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Our non-U.S. government bond portfolio consists of securities issued by governments, provinces, agencies and supranationals as well as debt issued by financial institutions that is guaranteed by non-U.S. governments.  The following table provides additional detail on the fair value and amortized cost of our portfolio of non-U.S. government fixed maturity available-for-sale securities, fixed maturity trading securities and short-term investments converted to U.S. dollars as of June 30, 2012 ($ in thousands):

	Fair Value
Non-U.S. government portfolio	Basic Monetary Unit		Other Non-U.S. Dollar		U.S. Dollar		Total		Amortized Cost
Germany	$	43,304	$	-	$	-	$	43,304	$	40,119
Ireland		-		-		4,814		4,814		4,999
Netherlands		-		1,512		-		1,512		1,376
Eurozone governments		43,304		1,512		4,814		49,630		46,494
New Zealand		109,020		-		-		109,020		109,009
United Kingdom		55,431		-		-		55,431		50,112
Australia		6,847		-		30,784		37,631		36,373
Norway		-		-		33,355		33,355		32,993
Sweden		-		1,294		20,076		21,370		21,163
Japan		-		-		5,266		5,266		5,000
Supranational		-		1,865		-		1,865		1,679
Other non-U.S. governments		171,298		3,159		89,481		263,938		256,329
Total non-U.S. governments	$	214,602	$	4,671	$	94,295	$	313,568	$	302,823

We invest in non-U.S. dollar denominated securities for purposes of hedging our non-U.S. dollar denominated reinsurance liabilities.  Our investments in debt issued by Eurozone financial institutions are guaranteed by their respective governments and are included in the table above.

In addition to the investments noted above, we hold non-U.S. dollar denominated cash and cash equivalents of $250.9 million that are also held for the purpose of hedging our net foreign currency reinsurance liabilities.

The net unrealized gain position of our municipal bond and corporate bond portfolios was $148.0 million and $19.5 million, respectively, as of June 30, 2012 as compared with an unrealized gain position of our municipal bond and corporate bond portfolios of $150.1 million and $20.3 million, respectively, as of December 31, 2011.  The decrease in the net unrealized gain position in our municipal bond portfolio was the result of sales activities partially offset by the positive impact of the narrowing of interest rate spreads and lower U.S. Government treasury yields.  We analyze the creditworthiness of our municipal bond and corporate bond portfolios by reviewing various performance metrics of the issuer, including financial condition, credit ratings and other public information. 

The net unrealized gain position of our portfolio of CMBS was $12.6 million as of June 30, 2012 as compared with $9.3 million as of December 31, 2011.  The net unrealized gain position was positively impacted by a narrowing of interest rate spreads and lower U.S. Government treasury yields, partially offset by sales activities. We analyze our CMBS on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include delinquencies, defaults, foreclosures, debt-service-coverage ratios and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.  Our portfolio consists primarily of senior tranches of CMBS with high credit ratings and strong credit support.

The net unrealized loss position of our RMBS portfolio was $7.0 million, with non-agency RMBS representing $8.6 million, as of June 30, 2012 as compared with $9.6 million, with non-agency RMBS representing $11.3 million, as of December 31, 2011.  Approximately 83% of the RMBS in our investment portfolio were issued or are guaranteed by the Government National Mortgage Association, the Federal National Mortgage Association, Federal Home Loan Mortgage Corporation, or the Federal Deposit Insurance Corporation and are referred to as U.S. Government agency RMBS.  The remaining 17% of our RMBS were issued by non-agency institutions and included securities with underlying Alt-A mortgages.  Securities with underlying sub-prime mortgages as collateral are included in ABS. The net unrealized loss position of our portfolio of sub-prime ABS was $2.7 million as of June 30, 2012 as compared with $2.3 million as of December 31, 2011.  We analyze our non-agency RMBS and sub-prime ABS on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include, but are not limited to, delinquencies, defaults, foreclosures, prepayment speeds and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.

We believe that the gross unrealized losses in our available-for-sale portfolio represent temporary declines in fair value.  We believe that the unrealized losses are not necessarily predictive of ultimate performance and that the provisions we have made for net impairment losses are adequate.  However, economic conditions may deteriorate more than expected and may adversely affect the expected cash flows of our securities, which in turn may lead to impairment losses recorded in future periods.  Conversely, economic conditions may improve more than expected and favorably increase the cash flows expected from these impaired securities, which would be earned through net investment income over the remaining life of the security.

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Credit Facilities

Syndicated Credit Facility

On June 24, 2011, we entered into an amended and restated three-year $300.0 million credit facility (the "Syndicated Credit Facility") that consists of a $100.0 million unsecured senior credit facility available for revolving borrowings and letters of credit and a $200.0 million secured senior credit facility available for letters of credit.  The Syndicated Credit Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the Syndicated Credit Facility.

Letter of Credit Facility

On June 30, 2011, our reinsurance subsidiaries entered into a letter of credit facility in the maximum aggregate amount of $100.0 million (the “LOC Facility”) that expires on December 31, 2013.  Under the terms of the LOC Facility, up to $100.0 million is available for the issuance of letters of credit to support reinsurance obligations of our reinsurance subsidiaries.  The LOC Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the LOC Facility.

We had no cash borrowings under the Syndicated Credit Facility during the six months ended June 30, 2012.  The following table summarizes the outstanding letters of credit and the cash and cash equivalents and investments held in trust to collateralize the letters of credit issued as of June 30, 2012 ($ in thousands):

	Letters of Credit				Collateral
	Capacity		Issued		Cash and Cash Equivalents		Investments		Total
Syndicated Credit Facility:
Secured	$	200,000	$	101,399	$	118,287	$	-	$	118,287
Unsecured		100,000		-		-		-		-
Total Syndicated Credit Facility		300,000		101,399		118,287		-		118,287
LOC Facility		100,000		36,273		32,010		13,268		45,278
Total	$	400,000	$	137,672	$	150,297	$	13,268	$	163,565

Capital Resources

At June 30, 2012, our capital resources of $1.97 billion consisted of $1.72 billion of common shareholders’ equity and $250.0 million of debt obligations.  At December 31, 2011, our capital resources of $1.94 billion consisted of $1.69 billion of common shareholders’ equity and $250.0 million of debt obligations.  The increase in capital during the six months ended June 30, 2012 was primarily attributable to our net income of $120.8 million, partially offset by repurchases of common shares of $89.9 million.

Share and Debt Repurchases

Our Board of Directors has authorized the repurchase of our common shares through a share repurchase program.  Since the program was established, our Board of Directors has approved increases in the repurchase program from time to time, most recently on July 23, 2012, to result in authority as of such date to repurchase up to a total of $250.0 million of our common shares.

During the six months ended June 30, 2012, in accordance with the share repurchase program, we repurchased 2,464,471 of our common shares in the open market for an aggregate cost of $89.9 million at a weighted average cost including commissions of $36.49 per share.  The shares we repurchased were canceled.

Our Board of Directors has also authorized the repurchase of up to $250.0 million of our outstanding debt obligations issued by Platinum Finance in open market purchases, privately negotiated transactions or otherwise.  We have not repurchased any of our debt obligations.

The timing and amount of the repurchase transactions under our repurchase programs depends on a variety of factors, including market conditions, our liquidity requirements, contractual restrictions, corporate and regulatory considerations and other factors.

Off-Balance Sheet Arrangements

We do not have any off-balance sheet arrangements, as defined for purposes of the U.S. Securities and Exchange Commission (“SEC”) rules, which are not accounted for or disclosed in the “Consolidated Financial Statements” contained elsewhere in this Form 10-Q as of June 30, 2012.

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Contractual Obligations

There have been no material changes outside of the ordinary course of business to our contractual obligations as disclosed under Item 7, “Management’s Discussion and Analysis of Financial Condition and Results of Operations – Financial Condition - Contractual Obligations,” in our 2011 Form 10-K.

Recently Issued Accounting Standards

See Note 1 to the “Consolidated Financial Statements” contained elsewhere in this Form 10-Q for a discussion of recently issued accounting standards.

Note On Forward-Looking Statements

This Form 10-Q contains forward-looking statements within the meaning of Section 27A of the Securities Act of 1933 and Section 21E of the Securities Exchange Act of 1934 (the “Exchange Act”).  Forward-looking statements are based on our current plans or expectations that are inherently subject to significant business, economic and competitive uncertainties and contingencies.  These uncertainties and contingencies can affect actual results and could cause actual results to differ materially from those expressed in any forward-looking statements made by, or on behalf of, us.  In particular, statements using words such as “may,” “should,” “estimate,” “expect,” “anticipate,” “intend,” “believe,” “predict,” “potential,” or words of similar import generally involve forward-looking statements.

The inclusion of forward-looking statements in this Form 10-Q should not be considered as a representation by us or any other person that our current plans or expectations will be achieved.  Numerous factors could cause our actual results to differ materially from those in forward-looking statements, including the following:

·   the occurrence of severe natural or man-made catastrophic events;

·   the effectiveness of our loss limitation methods and pricing models;

·   the adequacy of our ceding companies’ ability to assess the risks they underwrite;

·   the adequacy of our liability for unpaid losses and loss adjustment expenses;

·   the effects of emerging claim and coverage issues on our business;

·   our ability to maintain our A.M. Best and S&P ratings;

·   our ability to raise capital on acceptable terms if necessary;

·   our exposure to credit loss from counterparties in the normal course of business;

·   our ability to provide reinsurance from Bermuda to insurers domiciled in the United States;

·   the effect on our business of the cyclicality of the property and casualty reinsurance business;

·   the effect on our business of the highly competitive nature of the property and casualty reinsurance industry;

·   losses that we could face from terrorism, political unrest and war;

·   our dependence on the business provided to us by reinsurance brokers and our exposure to credit risk associated with our brokers during the premium and loss settlement process;

·   the availability of catastrophic loss protection on acceptable terms;

·   foreign currency exchange rate fluctuation;

·   our ability to maintain and enhance effective operating procedures and internal controls over financial reporting;

·   our need to make many estimates and judgments in the preparation of our financial statements;

- 40 -

·   the limitations placed on our financial and operational flexibility by the representations, warranties and covenants in our debt and credit facilities;

·   our ability to retain key executives and attract and retain additional qualified personnel in the future;

·   the performance of our investment portfolio;

·   fluctuations in the mortgage-backed and asset-backed securities markets;

·   the effects of changes in market interest rates on our investment portfolio;

·   the concentration of our investment portfolio in any particular industry, asset class or geographic region;

·   the effects that the imposition of U.S. corporate income tax would have on Platinum Holdings and its non-U.S. subsidiaries;

·   the risk that U.S. persons who hold our shares will be subject to adverse U.S. federal income tax consequences under certain circumstances;

·   the risk that U.S. persons who dispose of our shares may be subject to U.S. federal income taxation at the rates applicable to dividends on all or a portion of their gains, if any;

·   the risk that holders of 10% or more of our shares may be subject to U.S. income taxation under the “controlled foreign corporation” rules;

·   the effect of changes in U.S. federal income tax law on an investment in our shares;

·   the possibility that we may become subject to taxes in Bermuda;

·   the effect on our business of potential changes in the regulatory system under which we operate;

·   the impact of regulatory regimes and changes to accounting rules on our financial results, irrespective of business operations;

·   the uncertain impact on our business of the Dodd–Frank Wall Street Reform and Consumer Protection Act of 2010;

·   the dependence of the cash flows of Platinum Holdings, a holding company, on dividends, interest and other permissible payments from its subsidiaries to meet its obligations;

·   the risk that our shareholders may have greater difficulty in protecting their interests than would shareholders of a U.S. corporation; and

·   limitations on the ownership, transfer and voting rights of our common shares.

As a consequence, our future financial condition and results may differ from those expressed in any forward-looking statements made by or on behalf of us.  The foregoing factors should not be construed as exhaustive.  Additionally, forward-looking statements speak only as of the date they are made, and we undertake no obligation to revise or update forward-looking statements to reflect new information or circumstances after the date hereof or to reflect the occurrence of future events.  For a detailed discussion of our risk factors, refer to Item 1A, "Risk Factors," in our 2011 Form 10-K.

ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

We believe that we are principally exposed to the following types of market risk:  interest rate risk, credit risk, liquidity risk and foreign currency exchange rate risk. The following discussion focuses only on material changes to these types of market risks since December 31, 2011.  See Item 7A, “Quantitative and Qualitative Disclosures About Market Risk,” in our 2011 Form 10-K for a complete discussion of these risks.

Interest Rate Risk

The following table shows the aggregate hypothetical impact on the market value of our fixed maturity securities portfolio as of June 30, 2012, resulting from an immediate parallel shift in interest rates ($ in thousands):

	Interest Rate Shift in Basis Points
		- 100bp			- 50bp		Current				+ 50bp			+ 100bp
Total market value	$	2,553,619		$	2,487,590		$	2,423,834		$	2,362,948		$	2,304,960
Percent change in market value		5.4	%		2.6	%		0.0	%		(2.5	%)		(4.9	%)
Resulting net appreciation (depreciation)	$	129,785		$	63,756		$	-		$	(60,886	)	$	(118,874	)

Actual shifts in interest rates may not change by the same magnitude across the maturity spectrum and, as a result, the impact on the fair value of our fixed maturity securities portfolio may be materially different from the resulting net appreciation or depreciation indicated in the table above.

- 41 -

ITEM 4. CONTROLS AND PROCEDURES

Disclosure Controls and Procedures

Our management, including the Chief Executive Officer and Chief Financial Officer, carried out an evaluation of the effectiveness of the design and operation of our disclosure controls and procedures (as such term is defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act) as of the end of the period covered by this Form 10-Q.  Based on that evaluation, our management, including the Chief Executive Officer and Chief Financial Officer, concluded that our disclosure controls and procedures are effective to provide reasonable assurance that information required to be disclosed by us in reports that we file or submit under the Exchange Act is recorded, processed, summarized and timely reported as specified in the SEC’s rules and forms, and is accumulated and communicated to our management, including the Chief Executive Officer and Chief Financial Officer, as appropriate, to allow timely decisions regarding required disclosure.

Changes in Internal Control over Financial Reporting

No changes occurred during the three months ended June 30, 2012 in our internal control over financial reporting that have materially affected, or are reasonably likely to materially affect, our internal control over financial reporting.

PART II – OTHER INFORMATION

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

The following table summarizes our purchases of our common shares during the three months ended June 30, 2012:

Period	Total Number of Shares Purchased		Average Price Paid per Share (1)		Total Number of Shares Purchased as Part of a Publicly Announced Program (2)		Maximum Dollar Value of Shares that May Yet Be Purchased Under the Program
April 1, 2012 – April 30, 2012		411,800	$	35.98		411,800	$	132,305,268
May 1, 2012 – May 31, 2012		998,391		36.66		998,391		95,705,431
June 1, 2012 - June 30, 2012		245,584		36.78		245,584		86,671,790
Total		1,655,775	$	36.51		1,655,775	$	86,671,790

(1) Including commissions.

(2) Our Board of Directors established a program authorizing the repurchase of our common shares.  Since the program was established, our Board of Directors has approved increases in the repurchase program from time to time, most recently on July 23, 2012, to result in authority as of such date to repurchase up to a total of $250.0 million of our common shares.

ITEM 6. EXHIBITS

Exhibit Number	Description
31.1	Certification of Michael D. Price, Chief Executive Officer of Platinum Holdings, pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
31.2	Certification of Allan C. Decleir, Chief Financial Officer of Platinum Holdings, pursuant to Rule 13a-14(a) or Rule 15d-14(a) of the Securities Exchange Act of 1934, as amended.
32.1	Certification of Michael D. Price, Chief Executive Officer of Platinum Holdings, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Allan C. Decleir, Chief Financial Officer of Platinum Holdings, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to section 906 of the Sarbanes-Oxley Act of 2002.
101	Interactive data files pursuant to Rule 405 of Regulation S-T: (i) the Consolidated Balance Sheets as of June 30, 2012 (unaudited) and December 31, 2011, (ii) the Consolidated Statements of Operations for the three and six months ended June 30, 2012 and 2011 (unaudited), (iii) the Consolidated Statements of Comprehensive Income (Loss) for the three and six months ended June 30, 2012 and 2011 (unaudited), (iv) the Consolidated Statements of Shareholders’ Equity for the six months ended June 30, 2012 and 2011 (unaudited), (v) the Consolidated Statements of Cash Flows for the six months ended June 30, 2012 and 2011 (unaudited), and (vi) the Notes to the Consolidated Financial Statements for the three and six months ended June 30, 2012 and 2011 (unaudited).

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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.

	Platinum Underwriters Holdings, Ltd.
Date: July 26, 2012	By:	/s/ Michael D. Price
		Michael D. Price
		President and Chief Executive Officer (Principal Executive Officer)

Date: July 26, 2012	By:	/s/ Allan C. Decleir
		Allan C. Decleir
		Executive Vice President and Chief Financial Officer (Principal Financial Officer and Principal Accounting Officer)

- 43 -

EX-31.1

Exhibit 31.1

CERTIFICATION OF PRESIDENT AND CHIEF EXECUTIVE OFFICER

I, Michael D. Price, certify that:

1. I have reviewed this report on Form 10-Q (the "Report") of Platinum Underwriters Holdings, Ltd. (the "Registrant");

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 this 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 (the Registrant’s fourth fiscal quarter in the case of an annual report) 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 the audit committee of the 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: July 26, 2012	By:	/s/ Michael D. Price
		Michael D. Price
		President and Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION OF CHIEF FINANCIAL OFFICER

I, Allan C. Decleir, certify that:

1. I have reviewed this report on Form 10-Q (the "Report") of Platinum Underwriters Holdings, Ltd. (the "Registrant");

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 this 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 (the Registrant’s fourth fiscal quarter in the case of an annual report) 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 the audit committee of the 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: July 26, 2012	By:	/s/ Allan C. Decleir
		Allan C. Decleir
		Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Michael D. Price, President and Chief Executive Officer of Platinum Underwriters Holdings, Ltd., hereby certify to the best of my knowledge and belief that this Quarterly Report on Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)) and that the information contained in this Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Platinum Underwriters Holdings, Ltd.

Date: July 26, 2012	By:	/s/ Michael D. Price
		Michael D. Price
		President and Chief Executive Officer

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

I, Allan C. Decleir, Executive Vice President and Chief Financial Officer of Platinum Underwriters Holdings, Ltd., hereby certify to the best of my knowledge and belief that this Quarterly Report on Form 10-Q fully complies with the requirements of Section 13(a) or 15(d) of the Securities Exchange Act of 1934 (15 U.S.C. 78m(a) or 78o(d)) and that the information contained in this Quarterly Report on Form 10-Q fairly presents, in all material respects, the financial condition and results of operations of Platinum Underwriters Holdings, Ltd.

Date: July 26, 2012	By:	/s/ Allan C. Decleir
		Allan C. Decleir
		Executive Vice President and Chief Financial Officer

XML

Statutory Regulations and Dividend Capacity (Details) (USD $)	6 Months Ended		1 Months Ended	6 Months Ended		1 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jul. 24, 2012 Platinum Bermuda [Member]	Jun. 30, 2012 Platinum Bermuda [Member]	Jun. 30, 2012 Platinum United States [Member]	Jul. 24, 2012 Platinum Holdings [Member]	Jun. 30, 2012 Platinum Holdings [Member]
Statutory Accounting Practices [Line Items]
Dividends received during period	$ 0	$ 0				$ 50,000,000	$ 70,000,000
Maximum amount available for payment of dividends without prior regulatory approval	339,566,000			286,574,000	52,992,000
Remaining amount available for payment of dividends or other distributions by reinsurance subsidiaries without regulatory approval	269,600,000
Dividends paid during period			$ 50,000,000	$ 70,000,000

XML

Earnings (Loss) per Common Share (Tables)

6 Months Ended

Jun. 30, 2012

Earnings (Loss) per Common Share:

Reconciliation of basic and diluted earnings or loss per common share

The following is a reconciliation of basic and diluted earnings or loss per common share for the three and six months ended June 30, 2012 and 2011 ($ and amounts in thousands, except per share data):

	Three Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2012			2011			2012			2011
Earnings (Loss)
Basic and Diluted
Net income (loss) attributable to common shareholders	$	67,532		$	(20,401	)	$	120,819		$	(177,593	)
Portion allocated to participating common shareholders (1)		(278	)		137			(485	)		1,069
Net income (loss) allocated to common shareholders	$	67,254		$	(20,264	)	$	120,334		$	(176,524	)
Common Shares
Basic
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Diluted
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Effect of dilutive securities:
Common share options		142			127			139			268
Restricted share units		48			159			64			269
Adjusted weighted average common shares outstanding		34,104			37,399			34,805			37,692
Earnings (Loss) Per Common Share
Basic earnings (loss) per common share	$	1.98		$	(0.55	)	$	3.48		$	(4.75	)
Diluted earnings (loss) per common share (2)	$	1.97		$	(0.55	)	$	3.46		$	(4.75	)

(1) Represents earnings attributable to holders of unvested restricted shares issued under the Company's share incentive plans that are considered to be participating securities.

(2) During a period of loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation as the effect of including potential dilutive shares would be anti-dilutive.

XML

Investments

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Investments

2. Investments

Fixed Maturity Available-for-sale Securities

The following table sets forth our fixed maturity available-for-sale securities as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Included in Accumulated Other Comprehensive Income
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Non-credit portion of OTTI(1)
June 30, 2012:
U.S. Government	$	4,667	$	344	$	-	$	5,011	$	-
U.S. Government agencies		10,003		161		-		10,164		-
Municipal bonds		1,204,826		148,029		18		1,352,837		-
Non-U.S. governments		92,948		1,532		185		94,295		-
Corporate bonds		330,863		20,255		716		350,402		-
Commercial mortgage-backed securities		188,789		13,941		1,374		201,356		171
Residential mortgage-backed securities		283,247		2,355		9,320		276,282		6,068
Asset-backed securities		22,323		775		3,458		19,640		3,096
Total fixed maturity available-for-sale securities	$	2,137,666	$	187,392	$	15,071	$	2,309,987	$	9,335
December 31, 2011:
U.S. Government	$	4,702	$	381	$	-	$	5,083	$	-
U.S. Government agencies		100,000		259		-		100,259		-
Municipal bonds		1,510,658		150,280		178		1,660,760		-
Non-U.S. governments		69,992		1,929		655		71,266		-
Corporate bonds		329,218		21,093		763		349,548		-
Commercial mortgage-backed securities		195,309		11,884		2,584		204,609		196
Residential mortgage-backed securities		261,187		2,866		12,426		251,627		8,397
Asset-backed securities		23,644		489		3,711		20,422		2,821
Total fixed maturity available-for-sale securities	$	2,494,710	$	189,181	$	20,317	$	2,663,574	$	11,414

(1) The non-credit portion of other than temporary impairments ("OTTI") represents the amount of unrealized losses on impaired securities that were not realized in earnings as of the reporting date.  These unrealized losses are included in gross unrealized losses as of June 30, 2012 and December 31, 2011.

Our fixed maturity available-for-sale securities are U.S. dollar denominated securities.  Non-U.S. governments consist primarily of securities issued by governments and financial institutions that are explicitly guaranteed by the respective government.  At December 31, 2011, U.S. Government agencies consist of securities issued by financial institutions under the Temporary Liquidity Guarantee Program guaranteed by the Federal Deposit Insurance Corporation.

Fixed Maturity Trading Securities

The following table sets forth the fair value of our fixed maturity trading securities as of June 30, 2012 and December 31, 2011($ in thousands):

	June 30, 2012		December 31, 2011
Non-U.S. dollar denominated securities:
Non-U.S. governments	$	113,847	$	125,126
Total fixed maturity trading securities	$	113,847	$	125,126

Our non-U.S. government fixed maturity trading securities are non-U.S. dollar denominated investments held for the purposes of hedging our non-U.S. dollar foreign currency reinsurance liabilities.  

In prior periods, we have used insurance-linked securities to actively manage our exposure to catastrophe loss. We elected to record our investments in insurance-linked securities using the fair value option attributes of FASB Accounting Standards Codification ("ASC") 825, "Financial Instruments" ("ASC 825"), and recorded these in fixed maturity trading securities.  There were mark-to-market adjustments recorded under ASC 825 of less than $0.1 million of net realized losses for the three months ended June 30, 2011 and $1.3 million of net realized losses on investments for the six months ended June 30, 2011.  At acquisition, we determine our trading intent in the near term of our fixed maturity trading securities accounted for in accordance with ASC 825. If we do not intend to sell these securities in the near term, the purchases and sales are included in investing activities in our consolidated statements of cash flows, otherwise they are included in operating activities.  For the six months ended June 30, 2011, there were proceeds from sales of $20.4 million and no purchases of trading securities accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.

Short-term Investments

The following table sets forth the fair value of our short-term investments as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012		December 31, 2011
Available-for-sale:
U.S. Government	$	62,352	$	322,320
U.S. Government agencies		-		85,389
Trading:
Non-U.S. governments		105,426		181,125
Total short-term investments	$	167,778	$	588,834

Our U.S. dollar denominated short-term investments are accounted for as available-for-sale and our non-U.S. dollar denominated short-term investments are accounted for in accordance with the fair value option attributes of ASC 825.  The mark-to-market adjustments on short-term investments recognized under ASC 825 contributed no net realized gains or losses in the three months ended June 30, 2012 and less than $0.1 million of net realized losses on investments in the six months ended June 30, 2012.   The mark-to-market adjustments on short-term investments contributed less than $0.1 million of net realized losses for the three months ended June 30, 2011 and less than $0.1million of net realized gains on investments for the six months ended June 30, 2011.

For the six months ended June 30, 2012, we had purchases of $106.1 million, proceeds from sales of $20.6 million and proceeds from maturities of $169.6 million from non-U.S. dollar denominated short-term investments accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.  For the six months ended June 30, 2011, we had purchases of $132.4 million, proceeds from maturities of $30.6 million and no proceeds from sales from non-U.S. dollar denominated short-term investments accounted for in accordance with ASC 825 that were included in investing activities in the statements of cash flows.

Other-Than-Temporary Impairments

We analyze the creditworthiness of our investment portfolio by reviewing various performance metrics of the issuer, including financial condition, credit ratings and other public information.  We determined that none of our government bonds, municipal bonds or corporate bonds were other-than-temporarily impaired for the three and six months ended June 30, 2012 and 2011.

We analyze our commercial mortgage-backed securities ("CMBS") on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include delinquencies, defaults, foreclosures, debt-service-coverage ratios and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.  We recorded no net impairment losses related to CMBS for the three months ended June 30, 2012 and 2011, respectively, and less than $0.1 million of net impairment losses and no net impairment losses for the six months ended June 30, 2012 and 2011, respectively.  As of June 30, 2012, the single largest unrealized loss within our CMBS portfolio was $0.7 million related to a security with an amortized cost of $4.8 million.

Residential mortgage-backed securities ("RMBS") include U.S. Government agency RMBS and non-agency RMBS.  Securities with underlying sub-prime mortgages as collateral are included in asset-backed securities ("ABS").  We analyze our non-agency RMBS and sub-prime ABS on a periodic basis using default loss models based on the performance of the underlying loans.  Performance metrics include delinquencies, defaults, foreclosures, prepayment speeds and cumulative losses incurred.  The expected losses for a mortgage pool are compared with the current level of credit support, which generally represents the point at which our security would experience losses.  We evaluate projected cash flows as well as other factors in order to determine if a credit impairment has occurred.  We recorded net impairment losses related to non-agency RMBS of $1.1 million and $1.5 million for the three months ended June 30, 2012 and 2011, respectively, and $2.1 million and $2.4 million for the six months ended June 30, 2012 and 2011, respectively.  As of June 30, 2012, the single largest unrealized loss within our RMBS portfolio was $2.0 million related to a non-agency RMBS security with an amortized cost of $2.4 million.

We had no net impairment losses related to sub-prime ABS for the three months ended June 30, 2012 and $0.2million of net impairment losses for the three months ended June 30, 2011.  We had no net impairment losses related to sub-prime ABS for the six months ended June 30, 2012 and $0.8 million of net impairment losses for the six months ended June 30, 2011.  As of June 30, 2012, the single largest unrealized loss within our sub-prime ABS portfolio was $2.2 million related to a security with an amortized cost of $4.4 million.

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the three months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, April 1	$	60,444		$	48,138
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		1,113			1,646
Reduction for paydowns and securities sold		(3,464	)		(1,786	)
Reduction for increases in cash flows expected to be collected		(219	)		(146	)
Ending balance, June 30	$	57,874		$	47,872

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the six months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, January 1	$	61,841		$	48,845
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		2,183			3,153
Reduction for paydowns and securities sold		(5,721	)		(3,901	)
Reduction for increases in cash flows expected to be collected		(429	)		(245	)
Ending balance, June 30	$	57,874		$	47,872

As of June 30, 2012, total cumulative credit losses were related to CMBS, non-agency RMBS and sub-prime ABS.  The cumulative credit losses we recorded on CMBS of $4.1 million were on four securities issued from 2006 to 2007.  As of June 30, 2012, 6.4% of the mortgages backing these securities were 90 days or more past due and 0.9% of the mortgages had incurred cumulative losses.  For these securities, the expected losses for the underlying mortgages were greater than the remaining average credit support of 20.3%.   The cumulative credit losses we recorded on non-agency RMBS and sub-prime ABS of $53.8 million were on twenty-eight securities issued from 2004 to 2007.  As of June 30, 2012, 16.6% of the mortgages backing these securities were 90 days or more past due and 5.5% of the mortgages had incurred cumulative losses.  For these securities, the expected losses for the underlying mortgages were greater than the remaining average credit support of 6.8%.   

Unrealized Losses

The following table sets forth our gross unrealized losses on securities classified as fixed maturity available-for-sale aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.  The amounts only relate to securities in an unrealized loss position as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012				December 31, 2011
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Less than twelve months:
Municipal bonds	$	5,801	$	1	$	4,751	$	131
Non-U.S. governments		-		-		9,988		29
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		11,398		175		19,797		1,047
Residential mortgage-backed securities		96,128		371		131,574		2,112
Asset-backed securities		703		258		580		84
Total	$	151,449	$	1,521	$	179,216	$	4,166
Twelve months or more:
Municipal bonds	$	3,014	$	17	$	3,002	$	47
Non-U.S. governments		4,814		185		4,373		626
Corporate bonds		-		-		-		-
Commercial mortgage-backed securities		16,529		1,199		6,171		1,537
Residential mortgage-backed securities		46,116		8,949		43,704		10,314
Asset-backed securities		16,614		3,200		16,854		3,627
Total	$	87,087	$	13,550	$	74,104	$	16,151
Total unrealized losses:
Municipal bonds	$	8,815	$	18	$	7,753	$	178
Non-U.S. governments		4,814		185		14,361		655
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		27,927		1,374		25,968		2,584
Residential mortgage-backed securities		142,244		9,320		175,278		12,426
Asset-backed securities		17,317		3,458		17,434		3,711
Total	$	238,536	$	15,071	$	253,320	$	20,317

We believe that the gross unrealized losses in our fixed maturity available-for-sale securities portfolio represent temporary declines in fair value.  We believe that the unrealized losses are not necessarily predictive of ultimate performance and that the provisions we have made for net impairment losses are adequate.  However, economic conditions may deteriorate more than expected and may adversely affect the expected cash flows of our securities, which in turn may lead to impairment losses being recorded in future periods.  Conversely, economic conditions may improve more than expected and favorably increase the expected cash flows of our impaired securities, which would be earned through net investment income over the remaining life of the security.

Net Investment Income

The following table sets forth our net investment income for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Fixed maturity securities	$	24,583		$	32,561		$	51,870		$	64,412
Short-term investments and cash and cash equivalents		1,989			2,091			3,811			3,590
Funds held		600			395			1,254			613
Subtotal		27,172			35,047			56,935			68,615
Investment expenses		(1,017	)		(1,082	)		(2,228	)		(2,272	)
Net investment income	$	26,155		$	33,965		$	54,707		$	66,343

Net Realized Gains (Losses) on Investments

The following table sets forth our net realized gains (losses) on investments for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Gross realized gains on the sale of investments	$	25,263		$	477		$	47,941		$	4,421
Gross realized losses on the sale of investments		-			(6,894	)		(1	)		(6,897	)
Net realized gains (losses) on the sale of investments		25,263			(6,417	)		47,940			(2,476	)
Mark-to-market adjustments on trading securities		(285	)		1,728			(623	)		(1,806	)
Net realized gains (losses) on investments	$	24,978		$	(4,689	)	$	47,317		$	(4,282	)

Maturities

The actual maturities of our fixed maturity available-for-sale and trading securities could differ from stated maturities due to call or prepayment provisions.  The following table sets forth the amortized cost and fair value of our fixed maturity available-for-sale and trading securities by stated maturity as of June 30, 2012 ($ in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	93,049	$	93,926
Due from one to five years		430,712		456,377
Due from five to ten years		570,958		626,049
Due in ten or more years		653,038		750,204
Mortgage-backed and asset-backed securities		494,359		497,278
Total	$	2,242,116	$	2,423,834

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Derivative Instruments (Details) (USD $)	3 Months Ended		6 Months Ended		12 Months Ended	3 Months Ended	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011 Other Contract [Member]	Jun. 30, 2011 Other Contract [Member] Not Designated as Hedging Instrument [Member]	Jun. 30, 2011 Other Contract [Member] Not Designated as Hedging Instrument [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Inception date of derivative					Aug. 01, 2008
Amount of potential recovery from derivative					$ 200,000,000
Number of catastrophic events covered by derivative					2
Number of annual periods covered by derivative					3
Maturity date of derivative					Jul. 31, 2011
Net changes in fair value of derivatives	$ 0	$ (4,474,000)	$ 0	$ (748,000)		$ (4,474,000)	$ (748,000)

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Fair Value Measurements (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Investments:
Short-term investments	$ 167,778,000		$ 167,778,000		$ 588,834,000
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning balance	7,287,000	5,471,000	10,013,000	(1,353,000)
Purchases	0	0	0	4,829,000
Issuances	0	0	0	0
Settlements	0	2,427,000	0	0
Sales, maturities and paydowns	(641,000)	(89,000)	(734,000)	(165,000)
Total net realized gains included in earnings	0	0	0	0
Total increase (decrease) in fair value of the derivative instrument included in earnings	0	(4,474,000)	0	(748,000)
Total net unrealized gains (losses) included in comprehensive income (loss)	128,000	118,000	(251,000)	890,000
Transfers in to Level 3	2,253,000	0	2,253,000	0
Transfers out of Level 3	0	(1,434,000)	(2,254,000)	(1,434,000)
Ending balance	9,027,000	2,019,000	9,027,000	2,019,000
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	0	(4,474,000)	0	(748,000)
Series B Notes, interest rate, stated percentage (in hundredths)	7.50%		7.50%		7.50%
Debt obligations at carrying value	250,000,000		250,000,000		250,000,000
Debt obligations at fair value	273,200,000		273,200,000		269,000,000
Residential mortgage-backed securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning balance	5,564,000	3,305,000	8,146,000	2,449,000
Purchases	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Sales, maturities and paydowns	(641,000)	(89,000)	(734,000)	(165,000)
Total net realized gains included in earnings	0	0	0	0
Total increase (decrease) in fair value of the derivative instrument included in earnings	0	0	0	0
Total net unrealized gains (losses) included in comprehensive income (loss)	285,000	(407,000)	50,000	525,000
Transfers in to Level 3	2,253,000	0	2,253,000	0
Transfers out of Level 3	0	0	(2,254,000)	0
Ending balance	7,461,000	2,809,000	7,461,000	2,809,000
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	0	0	0	0
Asset-backed Securities [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning balance	1,723,000	909,000	1,867,000	1,069,000
Purchases	0	0	0	0
Issuances	0	0	0	0
Settlements	0	0	0	0
Sales, maturities and paydowns	0	0	0	0
Total net realized gains included in earnings	0	0	0	0
Total increase (decrease) in fair value of the derivative instrument included in earnings	0	0	0	0
Total net unrealized gains (losses) included in comprehensive income (loss)	(157,000)	525,000	(301,000)	365,000
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	(1,434,000)	0	(1,434,000)
Ending balance	1,566,000	0	1,566,000	0
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	0	0	0	0
Derivatives [Member]
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Abstract]
Beginning balance	0	1,257,000	0	(4,871,000)
Purchases	0	0	0	4,829,000
Issuances	0	0	0	0
Settlements	0	2,427,000	0	0
Sales, maturities and paydowns	0	0	0	0
Total net realized gains included in earnings	0	0	0	0
Total increase (decrease) in fair value of the derivative instrument included in earnings	0	(4,474,000)	0	(748,000)
Total net unrealized gains (losses) included in comprehensive income (loss)	0	0	0	0
Transfers in to Level 3	0	0	0	0
Transfers out of Level 3	0	0	0	0
Ending balance	0	(790,000)	0	(790,000)
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	0	(4,474,000)	0	(748,000)
Fair Value, Measurements, Recurring [Member]
Investments:
U.S. Government	5,011,000		5,011,000		5,083,000
U.S. Government agencies	10,164,000		10,164,000		100,259,000
Municipal bonds	1,352,837,000		1,352,837,000		1,660,760,000
Non-U.S. governments	208,142,000		208,142,000		196,392,000
Corporate bonds	350,402,000		350,402,000		349,548,000
Commercial mortgage-backed securities	201,356,000		201,356,000		204,609,000
Residential mortgage-backed securities	276,282,000		276,282,000		251,627,000
Asset-backed securities	19,640,000		19,640,000		20,422,000
Short-term investments	167,778,000		167,778,000		588,834,000
Total	2,591,612,000		2,591,612,000		3,377,534,000
Fair Value, Measurements, Recurring [Member] | Fair Value Measurement Using Level 1 [Member]
Investments:
U.S. Government	5,011,000		5,011,000		5,083,000
U.S. Government agencies	0		0		0
Municipal bonds	0		0		0
Non-U.S. governments	55,431,000		55,431,000		55,561,000
Corporate bonds	0		0		0
Commercial mortgage-backed securities	0		0		0
Residential mortgage-backed securities	0		0		0
Asset-backed securities	0		0		0
Short-term investments	0		0		34,894,000
Total	60,442,000		60,442,000		95,538,000
Fair Value, Measurements, Recurring [Member] | Fair Value Measurement Using Level 2 [Member]
Investments:
U.S. Government	0		0		0
U.S. Government agencies	10,164,000		10,164,000		100,259,000
Municipal bonds	1,352,837,000		1,352,837,000		1,660,760,000
Non-U.S. governments	152,711,000		152,711,000		140,831,000
Corporate bonds	350,402,000		350,402,000		349,548,000
Commercial mortgage-backed securities	201,356,000		201,356,000		204,609,000
Residential mortgage-backed securities	268,821,000		268,821,000		243,481,000
Asset-backed securities	18,074,000		18,074,000		18,555,000
Short-term investments	167,778,000		167,778,000		553,940,000
Total	2,522,143,000		2,522,143,000		3,271,983,000
Fair Value, Measurements, Recurring [Member] | Fair Value Measurement Using Level 3 [Member]
Investments:
U.S. Government	0		0		0
U.S. Government agencies	0		0		0
Municipal bonds	0		0		0
Non-U.S. governments	0		0		0
Corporate bonds	0		0		0
Commercial mortgage-backed securities	0		0		0
Residential mortgage-backed securities	7,461,000		7,461,000		8,146,000
Asset-backed securities	1,566,000		1,566,000		1,867,000
Short-term investments	0		0		0
Total	$ 9,027,000		$ 9,027,000		$ 10,013,000

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Credit Facilities (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012
Line of Credit Facility [Line Items]
Letters of Credit, capacity	$ 400,000
Letters of Credit, issued	137,672
Collateral, cash and cash equivalents	150,297
Collateral, investments	13,268
Collateral, Total	163,565
Letter of Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, affiliated borrower	Reinsurance subsidiaries
Line of credit facility, covenant terms	The LOC Facility contains customary representations, warranties and covenants.
Line of credit facility, covenant compliance	We are in compliance with the covenants under the LOC Facility.
Credit facility, initiation date	2011-06-30
Line of credit facility, expiration date	2013-12-31
Letters of Credit, capacity	100,000
Letters of Credit, issued	36,273
Collateral, cash and cash equivalents	32,010
Collateral, investments	13,268
Collateral, Total	45,278
Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Line of credit facility, covenant terms	The Syndicated Credit Facility contains customary representations, warranties and covenants.
Line of credit facility, covenant compliance	We are in compliance with the covenants under the Syndicated Credit Facility.
Credit facility, initiation date	2011-06-24
Syndicated Credit Facility [Member] | Secured Credit Facility [Member]
Line of Credit Facility [Line Items]
Letters of Credit, capacity	200,000
Letters of Credit, issued	101,399
Collateral, cash and cash equivalents	118,287
Collateral, investments	0
Collateral, Total	118,287
Syndicated Credit Facility [Member] | Unsecured Credit Facility [Member]
Line of Credit Facility [Line Items]
Letters of Credit, capacity	100,000
Letters of Credit, issued	0
Collateral, cash and cash equivalents	0
Collateral, investments	0
Collateral, Total	0
Total Syndicated Credit Facility [Member]
Line of Credit Facility [Line Items]
Letters of Credit, capacity	300,000
Letters of Credit, issued	101,399
Collateral, cash and cash equivalents	118,287
Collateral, investments	0
Collateral, Total	$ 118,287

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Income Taxes (Details) (United States [Member])	6 Months Ended
	Jun. 30, 2012
United States [Member]
Income Taxes [Line Items]
Income tax return currently under examination by Internal Revenue Service	2003
Income tax returns that remain open to examination	2008 and forward

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Basis of Presentation and Significant Accounting Policies

6 Months Ended

Jun. 30, 2012

Basis of Presentation and Significant Accounting Policies [Abstract]

Basis of Presentation and Significant Accounting Policies

1.           Basis of Presentation and Significant Accounting Policies

Basis of Presentation and Consolidation

Platinum Underwriters Holdings, Ltd. ("Platinum Holdings") is a holding company domiciled in Bermuda.  Through our reinsurance subsidiaries, we provide property and marine, casualty and finite risk reinsurance coverages to a diverse clientele of insurers and select reinsurers on a worldwide basis.

Platinum Holdings and its consolidated subsidiaries (collectively, the "Company") include Platinum Holdings, Platinum Underwriters Bermuda, Ltd. ("Platinum Bermuda"), Platinum Underwriters Reinsurance, Inc. ("Platinum US"), Platinum Underwriters Finance, Inc. ("Platinum Finance"), Platinum Regency Holdings ("Platinum Regency") and Platinum Administrative Services, Inc.  The terms "we," "us," and "our" refer to the Company, unless the context otherwise indicates.

Platinum Regency is an intermediate holding company based in Ireland and a wholly owned subsidiary of Platinum Holdings.  Platinum Finance is an intermediate holding company based in the U.S. and a wholly owned subsidiary of Platinum Regency.  We operate through two licensed reinsurance subsidiaries, Platinum Bermuda, a Bermuda reinsurance company, and Platinum US, a U.S. reinsurance company.   Platinum Bermuda is a wholly owned subsidiary of Platinum Holdings and Platinum US is a wholly owned subsidiary of Platinum Finance.  Platinum Administrative Services, Inc. is a subsidiary that provides administrative support services to the Company.

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information.  Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements.  All material inter-company transactions and accounts have been eliminated in preparing these consolidated financial statements.  The consolidated financial statements included in this report as of  June 30, 2012 and for the three and six months ended June 30, 2012 and 2011 are unaudited and include all adjustments consisting of normal recurring items that management considers necessary for a fair presentation under U.S. GAAP.  These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2011.

The preparation of financial statements requires us 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 may differ materially from these estimates.  The major estimates used in the preparation of the Company's consolidated financial statements, and therefore considered to be critical accounting estimates, include, but are not limited to, premiums written and earned, unpaid losses and loss adjustment expenses ("LAE"), reinsurance recoverable, valuation of investments and income taxes.  In addition, estimates are used to evaluate risk transfer for assumed and ceded reinsurance transactions.  Results of changes in estimates are reflected in results of operations in the period in which the change is made.  The results of operations for any interim period are not necessarily indicative of results for the full year.

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2011-12, "Comprehensive Income: Deferral of the Effective Date for Amendments to the Presentation of Reclassification of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05" ("ASU 2011-12").  ASU 2011-12 defers the presentation on the face of the financial statements of the effects of reclassifications of the components of net income and other comprehensive income out of accumulated other comprehensive income for all periods.  None of the other requirements of ASU 2011-05, "Presentation of Comprehensive Income" ("ASU 2011-05") issued in June 2011 are affected by ASU 2011-12.  ASU 2011-05 requires entities to report components of comprehensive income in either a continuous statement of comprehensive income or two separate but consecutive statements.  Under the continuous statement approach, the statement would include the components and total of net income, the components and total of other comprehensive income and the total of comprehensive income.  Under the two statement approach, the first statement would include the components and total of net income and the second statement would include the components and total of other comprehensive income and the total of comprehensive income.  ASU 2011-05 does not change the items that must be reported in other comprehensive income.  ASU 2011-05 is effective retrospectively for interim and annual periods beginning after December 15, 2011, with early adoption permitted.  We adopted the guidance as of January 1, 2012 and included a separate statement of comprehensive income (loss) in our financial statements.  The separate statement of comprehensive income (loss) incorporated the effects of reclassification adjustments recognized in our statement of operations.

In May 2011, the FASB issued ASU No. 2011-04, "Amendments to Achieve Common Fair Value Measurement and Disclosure Requirement in U.S. GAAP and IFRSs" ("ASU 2011-04").  ASU 2011-04 does not extend the use of fair value but, rather, provides guidance about how fair value should be applied where it already is required and permitted under U.S. GAAP or International Financial Reporting Standards ("IFRS").  For U.S. GAAP, most of the changes are clarifications of existing guidance or wording changes to align with IFRS.   ASU 2011-04 is effective on a prospective basis for interim and annual periods beginning after December 15, 2011, with early adoption not permitted.  In the period of adoption, a reporting entity is required to disclose a change, if any, in valuation technique and related inputs that result from applying ASU 2011-04 and to quantify the total effect, if practicable.  We adopted the guidance as of January 1, 2012 and there were no changes in valuation technique or inputs. Additional disclosures required under ASU 2011-04 have been reflected in Note 3.

In October 2010, the FASB issued ASU No. 2010-26, "Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts" ("ASU 2010-26").  ASU 2010-26 modifies the types of costs that may be deferred, allowing insurance companies to only defer costs directly related to successful acquisition of new or renewal contracts.  These costs include incremental direct costs of successful contracts, the portion of employees' salaries and benefits related to time spent on acquisition activities for successful contracts and other costs incurred in the acquisition of contracts.  Additional disclosure of the type of acquisition costs capitalized is also required.  ASU 2010-26 is effective on a prospective basis for interim and annual reporting periods beginning after December 15, 2011, with early adoption permitted as of the beginning of a company's annual period.  We adopted the guidance as of January 1, 2012 and there was no impact on our financial statements.

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Share Repurchases (Details) (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Share Repurchases [Abstract]
Share repurchase authorization description	Our Board of Directors has authorized the repurchase of our common shares through a share repurchase program. Since the program was established, our Board of Directors has approved increases in the repurchase program from time to time, most recently on July 23, 2012, to result in authority as of such date to repurchase up to a total of $250.0 million of our common shares
Amount authorized to repurchase common stock shares	$ 250,000,000
Number of common shares repurchased and retired during the period (in shares)	2,464,471
Aggregate amount paid for common shares repurchased and retired during the period	$ 89,935,000	$ 33,907,000
Weighted average cost per share for shares repurchased and retired (in dollars per share)	$ 36.49

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Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments:
Fixed maturity available-for-sale securities at fair value (amortized cost - $2,137,666 and $2,494,710, respectively)	$ 2,309,987	$ 2,663,574
Fixed maturity trading securities at fair value (amortized cost - $104,450 and $115,156, respectively)	113,847	125,126
Short-term investments	167,778	588,834
Total investments	2,591,612	3,377,534
Cash and cash equivalents	1,465,983	792,510
Accrued investment income	24,541	29,440
Reinsurance premiums receivable	145,132	159,387
Reinsurance recoverable on unpaid and paid losses and loss adjustment expenses	4,222	6,302
Prepaid reinsurance premiums	316	8,360
Funds held by ceding companies	111,408	94,546
Deferred acquisition costs	27,620	28,779
Deferred tax assets	25,038	31,613
Other assets	29,065	23,140
Total assets	4,424,937	4,551,611
Liabilities
Unpaid losses and loss adjustment expenses	2,229,603	2,389,614
Unearned premiums	114,759	121,164
Debt obligations	250,000	250,000
Commissions payable	64,304	62,773
Other liabilities	44,444	37,201
Total liabilities	2,703,110	2,860,752
Shareholders' Equity
Common shares, $0.01 par value, 200,000,000 shares authorized, 33,212,487 and 35,526,400 shares issued and outstanding, respectively	332	355
Additional paid-in capital	227,482	313,730
Accumulated other comprehensive income	148,562	146,635
Retained earnings	1,345,451	1,230,139
Total shareholders' equity	1,721,827	1,690,859
Total liabilities and shareholders' equity	$ 4,424,937	$ 4,551,611

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Consolidated Statements of Shareholders' Equity (Unaudited) (USD $) In Thousands, unless otherwise specified	Common shares [Member]	Additional paid-in capital [Member]	Accumulated other comprehensive income (loss) [Member]	Retained earnings [Member]	Total
Balances at Dec. 31, 2010	$ 377	$ 453,619	$ (24,488)	$ 1,465,947
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common share options	0	1,132
Issuance of common shares	0	2
Settlement of equity awards	4	(2,726)
Repurchase of common shares	(8)	(33,899)
Purchase of common share options		(47,900)			(47,900)
Share based compensation		2,275
Income tax benefit from share based compensation		379
Net change in unrealized gains and losses on available-for-sale securities, net of deferred taxes:
Change in unrealized gains and losses			60,987
Non-credit component of impairment losses			3,535
Net income (loss)				(177,593)	(177,593)
Common share dividends				(5,933)	(5,933)
Balances at Jun. 30, 2011	373	372,882	40,034	1,282,421	1,695,710
Balances at Dec. 31, 2011	355	313,730	146,635	1,230,139	1,690,859
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of common share options	0	1,014
Issuance of common shares	0	0
Settlement of equity awards	2	(1,109)
Repurchase of common shares	(25)	(89,910)
Purchase of common share options		0			0
Share based compensation		3,694
Income tax benefit from share based compensation		63
Net change in unrealized gains and losses on available-for-sale securities, net of deferred taxes:
Change in unrealized gains and losses			7
Non-credit component of impairment losses			1,920
Net income (loss)				120,819	120,819
Common share dividends				(5,507)	(5,507)
Balances at Jun. 30, 2012	$ 332	$ 227,482	$ 148,562	$ 1,345,451	$ 1,721,827

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Earnings (Loss) per Common Share (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Earnings (Loss) [Abstract]
Net income (loss) attributable to common shareholders	$ 67,532		$ (20,401)		$ 120,819		$ (177,593)
Portion allocated to participating common shareholders	(278)	[1]	137	[1]	(485)	[1]	1,069	[1]
Net income (loss) allocated to common shareholders	$ 67,254		$ (20,264)		$ 120,334		$ (176,524)
Common Shares - Basic [Abstract]
Weighted average common shares outstanding (in shares)	33,914		37,113		34,602		37,155
Common Shares - Diluted [Abstract]
Weighted average common shares outstanding (in shares)	33,914		37,113		34,602		37,155
Effect of dilutive securities: [Abstract]
Common share options (in shares)	142		127		139		268
Restricted share units (in shares)	48		159		64		269
Adjusted weighted average common shares outstanding (in shares)	34,104		37,399		34,805		37,692
Earnings (Loss) Per Common Share [Abstract]
Basic earnings (loss) per common share (in dollars per share)	$ 1.98		$ (0.55)		$ 3.48		$ (4.75)
Diluted earnings (loss) per common share (in dollars per share)	$ 1.97	[2]	$ (0.55)	[2]	$ 3.46	[2]	$ (4.75)	[2]

[1] Represents earnings attributable to holders of unvested restricted shares issued under the Company's share incentive plans that are considered to be participating securities.

[2] During a period of loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation as the effect of including potential dilutive shares would be anti-dilutive.

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Credit Facilities (Tables)

6 Months Ended

Jun. 30, 2012

Credit Facilities [Abstract]

Schedule of line of credit facilities

We had no cash borrowings under the Syndicated Credit Facility during the six months ended June 30, 2012.  The following table summarizes the outstanding letters of credit and the cash and cash equivalents and investments held in trust to collateralize the letters of credit issued as of June 30, 2012 ($ in thousands):

	Letters of Credit				Collateral
	Capacity		Issued		Cash and Cash Equivalents		Investments		Total
Syndicated Credit Facility:
Secured	$	200,000	$	101,399	$	118,287	$	-	$	118,287
Unsecured		100,000		-		-		-		-
Total Syndicated Credit Facility		300,000		101,399		118,287		-		118,287
LOC Facility		100,000		36,273		32,010		13,268		45,278
Total	$	400,000	$	137,672	$	150,297	$	13,268	$	163,565

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Condensed Consolidating Financial Information (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
ASSETS
Total investments	$ 2,591,612,000		$ 2,591,612,000		$ 3,377,534,000
Investment in subsidiaries	0		0		0
Cash and cash equivalents	1,465,983,000	1,318,773,000	1,465,983,000	1,318,773,000
Reinsurance assets	288,698,000		288,698,000		297,374,000
Other assets	78,644,000		78,644,000		84,193,000
Total assets	4,424,937,000		4,424,937,000		4,551,611,000
Liabilities
Reinsurance liabilities	2,408,816,000		2,408,816,000		2,573,701,000
Debt obligations	250,000,000		250,000,000		250,000,000
Other liabilities	44,294,000		44,294,000		37,051,000
Total liabilities	2,703,110,000		2,703,110,000		2,860,752,000
Shareholders' Equity
Common shares	332,000		332,000		355,000
Additional paid-in capital	227,482,000		227,482,000		313,730,000
Accumulated other comprehensive income	148,562,000		148,562,000		146,635,000
Retained earnings	1,345,451,000		1,345,451,000		1,230,139,000
Total shareholders' equity	1,721,827,000	1,695,710,000	1,721,827,000	1,695,710,000	1,690,859,000
Total liabilities and shareholders' equity	4,424,937,000		4,424,937,000		4,551,611,000
Revenue:
Net premiums earned	145,075,000	172,436,000	283,287,000	355,317,000
Net investment income	26,155,000	33,965,000	54,707,000	66,343,000
Net realized gains (losses) on investments	24,978,000	(4,689,000)	47,317,000	(4,282,000)
Net impairment losses on investments	(1,113,000)	(1,666,000)	(2,183,000)	(3,173,000)
Other income (expense)	(191,000)	(60,000)	(670,000)	1,036,000
Total revenue	194,904,000	199,986,000	382,458,000	415,241,000
Expenses:
Net losses and loss adjustment expenses	67,117,000	159,357,000	146,313,000	478,952,000
Net acquisition expenses	30,200,000	34,115,000	60,857,000	68,065,000
Net changes in fair value of derivatives	0	4,474,000	0	748,000
Operating expenses	19,696,000	17,105,000	36,679,000	34,256,000
Net foreign currency exchange losses (gains)	(310,000)	614,000	222,000	803,000
Interest expense	4,774,000	4,767,000	9,546,000	9,533,000
Total expenses	121,477,000	220,432,000	253,617,000	592,357,000
Income (loss) before income taxes	73,427,000	(20,446,000)	128,841,000	(177,116,000)
Income tax expense (benefit)	5,895,000	(45,000)	8,022,000	477,000
Income (loss) before equity in earnings of subsidiaries	67,532,000	(20,401,000)	120,819,000	(177,593,000)
Equity in earnings of subsidiaries	0	0	0	0
Net income (loss)	67,532,000	(20,401,000)	120,819,000	(177,593,000)
Other comprehensive income, net of deferred taxes	8,104,000	52,518,000	1,927,000	64,522,000
Comprehensive income (loss)	75,636,000	32,117,000	122,746,000	(113,071,000)
Net cash provided by (used in) operating activities			(59,185,000)	33,288,000
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities			395,269,000	353,402,000
Proceeds from sale of fixed maturity trading securities			0	20,413,000
Proceeds from sale of short-term investments			20,597,000	27,995,000
Proceeds from maturity or paydown of fixed maturity available-for-sale securities			179,768,000	72,694,000
Proceeds from maturity of short-term investments			577,296,000	140,014,000
Acquisition of fixed maturity available-for-sale securities			(172,110,000)	(34,499,000)
Acquisition of short-term investments			(168,542,000)	(211,527,000)
Dividends from subsidiaries			0	0
Investment in subsidiary				0
Inter-company loans				0
Net cash provided by (used in) investing activities			832,278,000	368,492,000
Financing Activities:
Dividends paid to common shareholders			(5,507,000)	(5,933,000)
Repurchase of common shares			(89,935,000)	(33,907,000)
Purchase of common share options			0	(47,900,000)
Proceeds from exercise of common share options			1,014,000	1,132,000
Capital contribution from parent				0
Inter-company loans				0
Net cash provided by (used in) financing activities			(94,428,000)	(86,608,000)
Effect of foreign currency exchange rate changes on cash			(5,192,000)	15,724,000
Net increase (decrease) in cash and cash equivalents			673,473,000	330,896,000
Cash and cash equivalents at beginning of period			792,510,000	987,877,000
Cash and cash equivalents at end of period	1,465,983,000	1,318,773,000	1,465,983,000	1,318,773,000
Platinum Holdings [Member]
Condensed Financial Statements, Captions [Line Items]
Amount guaranteed by Platinum Holdings	250,000,000		250,000,000
ASSETS
Total investments	0		0		0
Investment in subsidiaries	1,700,293,000		1,700,293,000		1,638,898,000
Cash and cash equivalents	17,665,000	42,152,000	17,665,000	42,152,000
Reinsurance assets	0		0		0
Other assets	8,379,000		8,379,000		6,229,000
Total assets	1,726,337,000		1,726,337,000		1,692,918,000
Liabilities
Reinsurance liabilities	0		0		0
Debt obligations	0		0		0
Other liabilities	4,510,000		4,510,000		2,059,000
Total liabilities	4,510,000		4,510,000		2,059,000
Shareholders' Equity
Common shares	332,000		332,000		355,000
Additional paid-in capital	227,482,000		227,482,000		313,730,000
Accumulated other comprehensive income	148,562,000		148,562,000		146,635,000
Retained earnings	1,345,451,000		1,345,451,000		1,230,139,000
Total shareholders' equity	1,721,827,000		1,721,827,000		1,690,859,000
Total liabilities and shareholders' equity	1,726,337,000		1,726,337,000		1,692,918,000
Revenue:
Net premiums earned	0	0	0	0
Net investment income	2,000	1,000	3,000	3,000
Net realized gains (losses) on investments	0	0	0	0
Net impairment losses on investments	0	0	0	0
Other income (expense)	991,000	(967,000)	2,187,000	(1,692,000)
Total revenue	993,000	(966,000)	2,190,000	(1,689,000)
Expenses:
Net losses and loss adjustment expenses	0	0	0	0
Net acquisition expenses	0	0	0	0
Net changes in fair value of derivatives	0	0	0	0
Operating expenses	5,834,000	5,826,000	10,775,000	10,049,000
Net foreign currency exchange losses (gains)	0	0	0	1,000
Interest expense	0	0	0	53,000
Total expenses	5,834,000	5,826,000	10,775,000	10,103,000
Income (loss) before income taxes	(4,841,000)	(6,792,000)	(8,585,000)	(11,792,000)
Income tax expense (benefit)	0	0	0	(600,000)
Income (loss) before equity in earnings of subsidiaries	(4,841,000)	(6,792,000)	(8,585,000)	(11,192,000)
Equity in earnings of subsidiaries	72,373,000	(13,609,000)	129,404,000	(166,401,000)
Net income (loss)	67,532,000	(20,401,000)	120,819,000	(177,593,000)
Other comprehensive income, net of deferred taxes	8,104,000	52,518,000	1,927,000	64,522,000
Comprehensive income (loss)	75,636,000	32,117,000	122,746,000	(113,071,000)
Net cash provided by (used in) operating activities			(5,698,000)	(1,275,000)
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities			0	0
Proceeds from sale of fixed maturity trading securities				0
Proceeds from sale of short-term investments			0	0
Proceeds from maturity or paydown of fixed maturity available-for-sale securities			0	0
Proceeds from maturity of short-term investments			0	0
Acquisition of fixed maturity available-for-sale securities			0	0
Acquisition of short-term investments			0	0
Dividends from subsidiaries			70,000,000	280,000,000
Investment in subsidiary				(120,000,000)
Inter-company loans				0
Net cash provided by (used in) investing activities			70,000,000	160,000,000
Financing Activities:
Dividends paid to common shareholders			(5,507,000)	(5,933,000)
Repurchase of common shares			(89,935,000)	(33,907,000)
Purchase of common share options				(47,900,000)
Proceeds from exercise of common share options			1,014,000	1,132,000
Capital contribution from parent				0
Inter-company loans				(75,000,000)
Net cash provided by (used in) financing activities			(94,428,000)	(161,608,000)
Effect of foreign currency exchange rate changes on cash			0	0
Net increase (decrease) in cash and cash equivalents			(30,126,000)	(2,883,000)
Cash and cash equivalents at beginning of period			47,791,000	45,035,000
Cash and cash equivalents at end of period	17,665,000	42,152,000	17,665,000	42,152,000
Platinum Finance [Member]
ASSETS
Total investments	232,000		232,000		274,000
Investment in subsidiaries	655,570,000		655,570,000		621,041,000
Cash and cash equivalents	103,139,000	72,928,000	103,139,000	72,928,000
Reinsurance assets	0		0		0
Other assets	5,362,000		5,362,000		6,620,000
Total assets	764,303,000		764,303,000		736,195,000
Liabilities
Reinsurance liabilities	0		0		0
Debt obligations	250,000,000		250,000,000		250,000,000
Other liabilities	1,632,000		1,632,000		1,634,000
Total liabilities	251,632,000		251,632,000		251,634,000
Shareholders' Equity
Common shares	0		0		0
Additional paid-in capital	213,405,000		213,405,000		213,342,000
Accumulated other comprehensive income	43,804,000		43,804,000		41,277,000
Retained earnings	255,462,000		255,462,000		229,942,000
Total shareholders' equity	512,671,000		512,671,000		484,561,000
Total liabilities and shareholders' equity	764,303,000		764,303,000		736,195,000
Revenue:
Net premiums earned	0	0	0	0
Net investment income	12,000	(7,000)	(7,000)	46,000
Net realized gains (losses) on investments	0	0	0	0
Net impairment losses on investments	0	0	0	0
Other income (expense)	0	3,000	1,000	118,000
Total revenue	12,000	(4,000)	(6,000)	164,000
Expenses:
Net losses and loss adjustment expenses	0	0	0	0
Net acquisition expenses	0	0	0	0
Net changes in fair value of derivatives	0	0	0	0
Operating expenses	67,000	143,000	133,000	202,000
Net foreign currency exchange losses (gains)	0	0	0	0
Interest expense	4,774,000	4,767,000	9,546,000	9,533,000
Total expenses	4,841,000	4,910,000	9,679,000	9,735,000
Income (loss) before income taxes	(4,829,000)	(4,914,000)	(9,685,000)	(9,571,000)
Income tax expense (benefit)	(1,627,000)	(1,679,000)	(3,265,000)	(3,263,000)
Income (loss) before equity in earnings of subsidiaries	(3,202,000)	(3,235,000)	(6,420,000)	(6,308,000)
Equity in earnings of subsidiaries	15,004,000	5,047,000	31,941,000	13,834,000
Net income (loss)	11,802,000	1,812,000	25,521,000	7,526,000
Other comprehensive income, net of deferred taxes	3,221,000	22,054,000	2,527,000	23,103,000
Comprehensive income (loss)	15,023,000	23,866,000	28,048,000	30,629,000
Net cash provided by (used in) operating activities			(5,161,000)	(6,482,000)
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities			0	0
Proceeds from sale of fixed maturity trading securities				0
Proceeds from sale of short-term investments			0	0
Proceeds from maturity or paydown of fixed maturity available-for-sale securities			40,000	63,000
Proceeds from maturity of short-term investments			0	0
Acquisition of fixed maturity available-for-sale securities			0	0
Acquisition of short-term investments			0	0
Dividends from subsidiaries			0	0
Investment in subsidiary				(3,000,000)
Inter-company loans				75,000,000
Net cash provided by (used in) investing activities			40,000	72,063,000
Financing Activities:
Dividends paid to common shareholders			0	0
Repurchase of common shares			0	0
Purchase of common share options				0
Proceeds from exercise of common share options			0	0
Capital contribution from parent				0
Inter-company loans				0
Net cash provided by (used in) financing activities			0	0
Effect of foreign currency exchange rate changes on cash			0	0
Net increase (decrease) in cash and cash equivalents			(5,121,000)	65,581,000
Cash and cash equivalents at beginning of period			108,260,000	7,347,000
Cash and cash equivalents at end of period	103,139,000	72,928,000	103,139,000	72,928,000
Non-guarantor Subsidiaries [Member]
ASSETS
Total investments	2,591,380,000		2,591,380,000		3,377,260,000
Investment in subsidiaries	512,671,000		512,671,000		484,561,000
Cash and cash equivalents	1,345,179,000	1,203,693,000	1,345,179,000	1,203,693,000
Reinsurance assets	288,698,000		288,698,000		297,374,000
Other assets	64,903,000		64,903,000		71,344,000
Total assets	4,802,831,000		4,802,831,000		4,866,998,000
Liabilities
Reinsurance liabilities	2,408,816,000		2,408,816,000		2,573,701,000
Debt obligations	0		0		0
Other liabilities	38,152,000		38,152,000		33,358,000
Total liabilities	2,446,968,000		2,446,968,000		2,607,059,000
Shareholders' Equity
Common shares	8,000,000		8,000,000		8,000,000
Additional paid-in capital	2,020,382,000		2,020,382,000		2,000,335,000
Accumulated other comprehensive income	192,357,000		192,357,000		187,903,000
Retained earnings	135,124,000		135,124,000		63,701,000
Total shareholders' equity	2,355,863,000		2,355,863,000		2,259,939,000
Total liabilities and shareholders' equity	4,802,831,000		4,802,831,000		4,866,998,000
Revenue:
Net premiums earned	145,075,000	172,436,000	283,287,000	355,317,000
Net investment income	26,141,000	33,971,000	54,711,000	66,347,000
Net realized gains (losses) on investments	24,978,000	(4,689,000)	47,317,000	(4,282,000)
Net impairment losses on investments	(1,113,000)	(1,666,000)	(2,183,000)	(3,173,000)
Other income (expense)	(1,182,000)	904,000	(2,858,000)	2,610,000
Total revenue	193,899,000	200,956,000	380,274,000	416,819,000
Expenses:
Net losses and loss adjustment expenses	67,117,000	159,357,000	146,313,000	478,952,000
Net acquisition expenses	30,200,000	34,115,000	60,857,000	68,065,000
Net changes in fair value of derivatives	0	4,474,000	0	748,000
Operating expenses	13,795,000	11,136,000	25,771,000	24,005,000
Net foreign currency exchange losses (gains)	(310,000)	614,000	222,000	802,000
Interest expense	0	0	0	0
Total expenses	110,802,000	209,696,000	233,163,000	572,572,000
Income (loss) before income taxes	83,097,000	(8,740,000)	147,111,000	(155,753,000)
Income tax expense (benefit)	7,522,000	1,634,000	11,287,000	4,340,000
Income (loss) before equity in earnings of subsidiaries	75,575,000	(10,374,000)	135,824,000	(160,093,000)
Equity in earnings of subsidiaries	11,802,000	1,835,000	25,521,000	7,573,000
Net income (loss)	87,377,000	(8,539,000)	161,345,000	(152,520,000)
Other comprehensive income, net of deferred taxes	11,326,000	74,574,000	4,454,000	87,625,000
Comprehensive income (loss)	98,703,000	66,035,000	165,799,000	(64,895,000)
Net cash provided by (used in) operating activities			(48,326,000)	41,045,000
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities			395,269,000	353,402,000
Proceeds from sale of fixed maturity trading securities				20,413,000
Proceeds from sale of short-term investments			20,597,000	27,995,000
Proceeds from maturity or paydown of fixed maturity available-for-sale securities			179,728,000	72,631,000
Proceeds from maturity of short-term investments			577,296,000	140,014,000
Acquisition of fixed maturity available-for-sale securities			(172,110,000)	(34,499,000)
Acquisition of short-term investments			(168,542,000)	(211,527,000)
Dividends from subsidiaries			0	0
Investment in subsidiary				0
Inter-company loans				100,000,000
Net cash provided by (used in) investing activities			832,238,000	468,429,000
Financing Activities:
Dividends paid to common shareholders			(70,000,000)	(280,000,000)
Repurchase of common shares			0	0
Purchase of common share options				0
Proceeds from exercise of common share options			0	0
Capital contribution from parent				123,000,000
Inter-company loans				(100,000,000)
Net cash provided by (used in) financing activities			(70,000,000)	(257,000,000)
Effect of foreign currency exchange rate changes on cash			(5,192,000)	15,724,000
Net increase (decrease) in cash and cash equivalents			708,720,000	268,198,000
Cash and cash equivalents at beginning of period			636,459,000	935,495,000
Cash and cash equivalents at end of period	1,345,179,000	1,203,693,000	1,345,179,000	1,203,693,000
Consolidating Adjustments [Member]
ASSETS
Total investments	0		0		0
Investment in subsidiaries	(2,868,534,000)		(2,868,534,000)		(2,744,500,000)
Cash and cash equivalents	0	0	0	0
Reinsurance assets	0		0		0
Other assets	0		0		0
Total assets	(2,868,534,000)		(2,868,534,000)		(2,744,500,000)
Liabilities
Reinsurance liabilities	0		0		0
Debt obligations	0		0		0
Other liabilities	0		0		0
Total liabilities	0		0		0
Shareholders' Equity
Common shares	(8,000,000)		(8,000,000)		(8,000,000)
Additional paid-in capital	(2,233,787,000)		(2,233,787,000)		(2,213,677,000)
Accumulated other comprehensive income	(236,161,000)		(236,161,000)		(229,180,000)
Retained earnings	(390,586,000)		(390,586,000)		(293,643,000)
Total shareholders' equity	(2,868,534,000)		(2,868,534,000)		(2,744,500,000)
Total liabilities and shareholders' equity	(2,868,534,000)		(2,868,534,000)		(2,744,500,000)
Revenue:
Net premiums earned	0	0	0	0
Net investment income	0	0	0	(53,000)
Net realized gains (losses) on investments	0	0	0	0
Net impairment losses on investments	0	0	0	0
Other income (expense)	0	0	0	0
Total revenue	0	0	0	(53,000)
Expenses:
Net losses and loss adjustment expenses	0	0	0	0
Net acquisition expenses	0	0	0	0
Net changes in fair value of derivatives	0	0	0	0
Operating expenses	0	0	0	0
Net foreign currency exchange losses (gains)	0	0	0	0
Interest expense	0	0	0	(53,000)
Total expenses	0	0	0	(53,000)
Income (loss) before income taxes	0	0	0	0
Income tax expense (benefit)	0	0	0	0
Income (loss) before equity in earnings of subsidiaries	0	0	0	0
Equity in earnings of subsidiaries	(99,179,000)	6,727,000	(186,866,000)	144,994,000
Net income (loss)	(99,179,000)	6,727,000	(186,866,000)	144,994,000
Other comprehensive income, net of deferred taxes	(14,547,000)	(96,628,000)	(6,981,000)	(110,728,000)
Comprehensive income (loss)	(113,726,000)	(89,901,000)	(193,847,000)	34,266,000
Net cash provided by (used in) operating activities			0	0
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities			0	0
Proceeds from sale of fixed maturity trading securities				0
Proceeds from sale of short-term investments			0	0
Proceeds from maturity or paydown of fixed maturity available-for-sale securities			0	0
Proceeds from maturity of short-term investments			0	0
Acquisition of fixed maturity available-for-sale securities			0	0
Acquisition of short-term investments			0	0
Dividends from subsidiaries			(70,000,000)	(280,000,000)
Investment in subsidiary				123,000,000
Inter-company loans				(175,000,000)
Net cash provided by (used in) investing activities			(70,000,000)	(332,000,000)
Financing Activities:
Dividends paid to common shareholders			70,000,000	280,000,000
Repurchase of common shares			0	0
Purchase of common share options				0
Proceeds from exercise of common share options			0	0
Capital contribution from parent				(123,000,000)
Inter-company loans				175,000,000
Net cash provided by (used in) financing activities			70,000,000	332,000,000
Effect of foreign currency exchange rate changes on cash			0	0
Net increase (decrease) in cash and cash equivalents			0	0
Cash and cash equivalents at beginning of period			0	0
Cash and cash equivalents at end of period	$ 0	$ 0	$ 0	$ 0

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Operating Segment Information (Tables)

6 Months Ended

Jun. 30, 2012

Operating Segment Information [Abstract]

Operating Segment Reporting of Underwriting Activity, Ratios and Income Reconciliation

In managing our operating segments, we use measures such as net underwriting income and underwriting ratios to evaluate segment performance.  We do not allocate assets or certain income and expenses such as net investment income, net realized gains and losses on investments, net impairment losses on investments, net changes in fair value of derivatives, net foreign currency exchange gains and losses, interest expense and certain corporate expenses by segment.  The measures we use in evaluating our operating segments should not be used as a substitute for measures determined under U.S. GAAP.  Underwriting ratios are considered to be non-GAAP measures and are calculated for net losses and LAE, net acquisition expense and net underwriting expense.  The ratios are calculated by dividing the related expense by net earned premiums.  The following table summarizes underwriting activity and ratios for the three operating segments, together with a reconciliation of segment underwriting income (loss) to income (loss) before income taxes for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	61,695		$	72,678		$	7,086		$	141,459
Net premiums earned		62,838			75,746			6,491			145,075
Net losses and loss adjustment expenses		17,653			45,851			3,613			67,117
Net acquisition expenses		8,721			18,487			2,992			30,200
Other underwriting expenses		7,454			5,625			267			13,346
Segment underwriting income (loss)	$	29,010		$	5,783		$	(381	)		34,412
Net investment income											26,155
Net realized gains (losses) on investments											24,978
Net impairment losses on investments											(1,113	)
Other income (expense)											(191	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(6,350	)
Net foreign currency exchange (losses) gains											310
Interest expense											(4,774	)
Income (loss) before income taxes										$	73,427
Underwriting ratios:
Net loss and loss adjustment expense		28.1	%		60.5	%		55.7	%		46.3	%
Net acquisition expense		13.9	%		24.4	%		46.1	%		20.8	%
Other underwriting expense		11.9	%		7.4	%		4.1	%		9.2	%
Combined		53.9	%		92.3	%		105.9	%		76.3	%
	Three Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	54,411		$	69,234		$	2,242		$	125,887
Net premiums earned		91,852			77,104			3,480			172,436
Net losses and loss adjustment expenses		116,543			43,868			(1,054	)		159,357
Net acquisition expenses		12,009			18,144			3,962			34,115
Other underwriting expenses		7,274			4,829			264			12,367
Segment underwriting income (loss)	$	(43,974	)	$	10,263		$	308			(33,403	)
Net investment income											33,965
Net realized gains (losses) on investments											(4,689	)
Net impairment losses on investments											(1,666	)
Other income (expense)											(60	)
Net changes in fair value of derivatives											(4,474	)
Corporate expenses not allocated to segments											(4,738	)
Net foreign currency exchange (losses) gains											(614	)
Interest expense											(4,767	)
Income (loss) before income taxes										$	(20,446	)
Underwriting ratios:
Net loss and loss adjustment expense		126.9	%		56.9	%		(30.3	%)		92.4	%
Net acquisition expense		13.1	%		23.5	%		113.9	%		19.8	%
Other underwriting expense		7.9	%		6.3	%		7.6	%		7.2	%
Combined		147.9	%		86.7	%		91.2	%		119.4	%

	Six Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	129,848		$	147,078		$	8,194		$	285,120
Net premiums earned		124,166			151,512			7,609			283,287
Net losses and loss adjustment expenses		58,590			86,887			836			146,313
Net acquisition expenses		17,956			35,862			7,039			60,857
Other underwriting expenses		14,289			10,661			458			25,408
Segment underwriting income (loss)	$	33,331		$	18,102		$	(724	)		50,709
Net investment income											54,707
Net realized gains (losses) on investments											47,317
Net impairment losses on investments											(2,183	)
Other income (expense)											(670	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(11,271	)
Net foreign currency exchange (losses) gains											(222	)
Interest expense											(9,546	)
Income (loss) before income taxes										$	128,841
Underwriting ratios:
Net loss and loss adjustment expense		47.2	%		57.3	%		11.0	%		51.6	%
Net acquisition expense		14.5	%		23.7	%		92.5	%		21.5	%
Other underwriting expense		11.5	%		7.0	%		6.0	%		9.0	%
Combined		73.2	%		88.0	%		109.5	%		82.1	%
	Six Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	166,213		$	149,753		$	4,706		$	320,672
Net premiums earned		189,757			157,928			7,632			355,317
Net losses and loss adjustment expenses		394,873			83,487			592			478,952
Net acquisition expenses		25,635			36,707			5,723			68,065
Other underwriting expenses		14,595			10,161			499			25,255
Segment underwriting income (loss)	$	(245,346	)	$	27,573		$	818			(216,955	)
Net investment income											66,343
Net realized gains (losses) on investments											(4,282	)
Net impairment losses on investments											(3,173	)
Other income (expense)											1,036
Net changes in fair value of derivatives											(748	)
Corporate expenses not allocated to segments											(9,001	)
Net foreign currency exchange (losses) gains											(803	)
Interest expense											(9,533	)
Income (loss) before income taxes										$	(177,116	)
Underwriting ratios:
Net loss and loss adjustment expense		208.1	%		52.9	%		7.8	%		134.8	%
Net acquisition expense		13.5	%		23.2	%		75.0	%		19.2	%
Other underwriting expense		7.7	%		6.4	%		6.5	%		7.1	%
Combined		229.3	%		82.5	%		89.3	%		161.1	%

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Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities:
Net income (loss)	$ 120,819	$ (177,593)
Adjustments to reconcile net income (loss) to cash provided by (used in) operations:
Depreciation and amortization	2,518	1,829
Net realized (gains) losses on investments	(47,317)	4,282
Net impairment losses on investments	2,183	3,173
Net foreign currency exchange losses	222	803
Share-based compensation	4,046	2,275
Deferred income tax expense	5,215	759
Net fixed maturity trading securities activities	9,877	142
Changes in assets and liabilities:
Decrease (increase) in accrued investment income	4,817	(276)
Decrease in reinsurance premiums receivable	13,778	15,896
Increase in funds held by ceding companies	(17,140)	(5,946)
Decrease in deferred acquisition costs	1,134	4,560
Increase (decrease) in net unpaid and paid losses and loss adjustment expenses	(158,720)	194,976
Increase (decrease) in net unearned premiums	1,833	(34,645)
Increase (decrease) in commissions payable	1,624	(5,531)
Changes in other assets and liabilities	(4,074)	28,584
Net cash provided by (used in) operating activities	(59,185)	33,288
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities	395,269	353,402
Proceeds from sale of fixed maturity trading securities	0	20,413
Proceeds from sale of short-term investments	20,597	27,995
Proceeds from maturity or paydown of fixed maturity available-for-sale securities	179,768	72,694
Proceeds from maturity of short-term investments	577,296	140,014
Acquisition of fixed maturity available-for-sale securities	(172,110)	(34,499)
Acquisition of short-term investments	(168,542)	(211,527)
Net cash provided by (used in) investing activities	832,278	368,492
Financing Activities:
Dividends paid to common shareholders	(5,507)	(5,933)
Repurchase of common shares	(89,935)	(33,907)
Purchase of common share options	0	(47,900)
Proceeds from exercise of common share options	1,014	1,132
Net cash provided by (used in) financing activities	(94,428)	(86,608)
Effect of foreign currency exchange rate changes on cash	(5,192)	15,724
Net increase (decrease) in cash and cash equivalents	673,473	330,896
Cash and cash equivalents at beginning of period	792,510	987,877
Cash and cash equivalents at end of period	1,465,983	1,318,773
Supplemental disclosures of cash flow information:
Income taxes paid	9,012	417
Interest paid	$ 9,375	$ 9,375

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Consolidated Balance Sheets (Unaudited) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Investments:
Fixed maturity available-for-sale securities, amortized cost	$ 2,137,666	$ 2,494,710
Fixed maturity trading securities, amortized cost	$ 104,450	$ 115,156
Shareholders' Equity
Common shares, par value (in dollars per share)	$ 0.01	$ 0.01
Common shares, authorized (in shares)	200,000,000	200,000,000
Common shares, issued (in shares)	33,212,487	35,526,400
Common shares, outstanding (in shares)	33,212,487	35,526,400

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Earnings (Loss) per Common Share

6 Months Ended

Jun. 30, 2012

Earnings (Loss) per Common Share:

Earnings (Loss) per Common Share

10.           Earnings (Loss) per Common Share

The following is a reconciliation of basic and diluted earnings or loss per common share for the three and six months ended June 30, 2012 and 2011 ($ and amounts in thousands, except per share data):

	Three Months Ended						Six Months Ended
	June 30,			June 30,			June 30,			June 30,
	2012			2011			2012			2011
Earnings (Loss)
Basic and Diluted
Net income (loss) attributable to common shareholders	$	67,532		$	(20,401	)	$	120,819		$	(177,593	)
Portion allocated to participating common shareholders (1)		(278	)		137			(485	)		1,069
Net income (loss) allocated to common shareholders	$	67,254		$	(20,264	)	$	120,334		$	(176,524	)
Common Shares
Basic
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Diluted
Weighted average common shares outstanding		33,914			37,113			34,602			37,155
Effect of dilutive securities:
Common share options		142			127			139			268
Restricted share units		48			159			64			269
Adjusted weighted average common shares outstanding		34,104			37,399			34,805			37,692
Earnings (Loss) Per Common Share
Basic earnings (loss) per common share	$	1.98		$	(0.55	)	$	3.48		$	(4.75	)
Diluted earnings (loss) per common share (2)	$	1.97		$	(0.55	)	$	3.46		$	(4.75	)

(1) Represents earnings attributable to holders of unvested restricted shares issued under the Company's share incentive plans that are considered to be participating securities.

(2) During a period of loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation as the effect of including potential dilutive shares would be anti-dilutive.

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Document and Entity Information	6 Months Ended
	Jun. 30, 2012	Jul. 19, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	PLATINUM UNDERWRITERS HOLDINGS LTD
Entity Central Index Key	0001171500
Current Fiscal Year End Date	--12-31
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		33,212,487
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q2
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2012

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Condensed Consolidating Financial Information

6 Months Ended

Jun. 30, 2012

Condensed Consolidating Financial Information [Abstract]

Condensed Consolidating Financial Information

11. Condensed Consolidating Financial Information

Platinum Holdings fully and unconditionally guarantees the $250.0 million of debt obligations issued by Platinum Finance.

The following tables present the condensed consolidating financial information for Platinum Holdings, Platinum Finance and the non-guarantor subsidiaries of Platinum Holdings as of June 30, 2012 and December 31, 2011 and for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

Condensed Consolidating Balance Sheet

June 30, 2012

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	232	$	2,591,380	$	-		$	2,591,612
Investment in subsidiaries		1,700,293		655,570		512,671		(2,868,534	)		-
Cash and cash equivalents		17,665		103,139		1,345,179		-			1,465,983
Reinsurance assets		-		-		288,698		-			288,698
Other assets		8,379		5,362		64,903		-			78,644
Total assets	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,408,816	$	-		$	2,408,816
Debt obligations		-		250,000		-		-			250,000
Other liabilities		4,510		1,632		38,152		-			44,294
Total liabilities	$	4,510	$	251,632	$	2,446,968	$	-		$	2,703,110
Shareholders' Equity
Common shares	$	332	$	-	$	8,000	$	(8,000	)	$	332
Additional paid-in capital		227,482		213,405		2,020,382		(2,233,787	)		227,482
Accumulated other comprehensive income		148,562		43,804		192,357		(236,161	)		148,562
Retained earnings		1,345,451		255,462		135,124		(390,586	)		1,345,451
Total shareholders' equity	$	1,721,827	$	512,671	$	2,355,863	$	(2,868,534	)	$	1,721,827
Total liabilities and shareholders' equity	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937

Condensed Consolidating Balance Sheet

December 31, 2011

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	274	$	3,377,260	$	-		$	3,377,534
Investment in subsidiaries		1,638,898		621,041		484,561		(2,744,500	)		-
Cash and cash equivalents		47,791		108,260		636,459		-			792,510
Reinsurance assets		-		-		297,374		-			297,374
Other assets		6,229		6,620		71,344		-			84,193
Total assets	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,573,701	$	-		$	2,573,701
Debt obligations		-		250,000		-		-			250,000
Other liabilities		2,059		1,634		33,358		-			37,051
Total liabilities	$	2,059	$	251,634	$	2,607,059	$	-		$	2,860,752
Shareholders' Equity
Common shares	$	355	$	-	$	8,000	$	(8,000	)	$	355
Additional paid-in capital		313,730		213,342		2,000,335		(2,213,677	)		313,730
Accumulated other comprehensive income		146,635		41,277		187,903		(229,180	)		146,635
Retained earnings		1,230,139		229,942		63,701		(293,643	)		1,230,139
Total shareholders' equity	$	1,690,859	$	484,561	$	2,259,939	$	(2,744,500	)	$	1,690,859
Total liabilities and shareholders' equity	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	145,075		$	-		$	145,075
Net investment income		2			12			26,141			-			26,155
Net realized gains (losses) on investments		-			-			24,978			-			24,978
Net impairment losses on investments		-			-			(1,113	)		-			(1,113	)
Other income (expense)		991			-			(1,182	)		-			(191	)
Total revenue		993			12			193,899			-			194,904
Expenses:
Net losses and loss adjustment expenses		-			-			67,117			-			67,117
Net acquisition expenses		-			-			30,200			-			30,200
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		5,834			67			13,795			-			19,696
Net foreign currency exchange losses (gains)		-			-			(310	)		-			(310	)
Interest expense		-			4,774			-			-			4,774
Total expenses		5,834			4,841			110,802			-			121,477
Income (loss) before income taxes		(4,841	)		(4,829	)		83,097			-			73,427
Income tax expense (benefit)		-			(1,627	)		7,522			-			5,895
Income (loss) before equity in earnings of subsidiaries		(4,841	)		(3,202	)		75,575			-			67,532
Equity in earnings of subsidiaries		72,373			15,004			11,802			(99,179	)		-
Net income (loss)	$	67,532		$	11,802		$	87,377		$	(99,179	)	$	67,532
Other comprehensive income, net of deferred taxes		8,104			3,221			11,326			(14,547	)		8,104
Comprehensive income (loss)	$	75,636		$	15,023		$	98,703		$	(113,726	)	$	75,636

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	172,436		$	-		$	172,436
Net investment income		1			(7	)		33,971			-			33,965
Net realized gains (losses) on investments		-			-			(4,689	)		-			(4,689	)
Net impairment losses on investments		-			-			(1,666	)		-			(1,666	)
Other income (expense)		(967	)		3			904			-			(60	)
Total revenue		(966	)		(4	)		200,956			-			199,986
Expenses:
Net losses and loss adjustment expenses		-			-			159,357			-			159,357
Net acquisition expenses		-			-			34,115			-			34,115
Net changes in fair value of derivatives		-			-			4,474			-			4,474
Operating expenses		5,826			143			11,136			-			17,105
Net foreign currency exchange losses (gains)		-			-			614			-			614
Interest expense		-			4,767			-			-			4,767
Total expenses		5,826			4,910			209,696			-			220,432
Income (loss) before income taxes		(6,792	)		(4,914	)		(8,740	)		-			(20,446	)
Income tax expense (benefit)		-			(1,679	)		1,634			-			(45	)
Income (loss) before equity in earnings of subsidiaries		(6,792	)		(3,235	)		(10,374	)		-			(20,401	)
Equity in earnings of subsidiaries		(13,609	)		5,047			1,835			6,727			-
Net income (loss)	$	(20,401	)	$	1,812		$	(8,539	)	$	6,727		$	(20,401	)
Other comprehensive income, net of deferred taxes		52,518			22,054			74,574			(96,628	)		52,518
Comprehensive income (loss)	$	32,117		$	23,866		$	66,035		$	(89,901	)	$	32,117

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	283,287		$	-		$	283,287
Net investment income		3			(7	)		54,711			-			54,707
Net realized gains (losses) on investments		-			-			47,317			-			47,317
Net impairment losses on investments		-			-			(2,183	)		-			(2,183	)
Other income (expense)		2,187			1			(2,858	)		-			(670	)
Total revenue		2,190			(6	)		380,274			-			382,458
Expenses:
Net losses and loss adjustment expenses		-			-			146,313			-			146,313
Net acquisition expenses		-			-			60,857			-			60,857
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		10,775			133			25,771			-			36,679
Net foreign currency exchange losses (gains)		-			-			222			-			222
Interest expense		-			9,546			-			-			9,546
Total expenses		10,775			9,679			233,163			-			253,617
Income (loss) before income taxes		(8,585	)		(9,685	)		147,111			-			128,841
Income tax expense (benefit)		-			(3,265	)		11,287			-			8,022
Income (loss) before equity in earnings of subsidiaries		(8,585	)		(6,420	)		135,824			-			120,819
Equity in earnings of subsidiaries		129,404			31,941			25,521			(186,866	)		-
Net income (loss)	$	120,819		$	25,521		$	161,345		$	(186,866	)	$	120,819
Other comprehensive income, net of deferred taxes		1,927			2,527			4,454			(6,981	)		1,927
Comprehensive income (loss)	$	122,746		$	28,048		$	165,799		$	(193,847	)	$	122,746

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	355,317		$	-		$	355,317
Net investment income		3			46			66,347			(53	)		66,343
Net realized gains (losses) on investments		-			-			(4,282	)		-			(4,282	)
Net impairment losses on investments		-			-			(3,173	)		-			(3,173	)
Other income (expense)		(1,692	)		118			2,610			-			1,036
Total revenue		(1,689	)		164			416,819			(53	)		415,241
Expenses:
Net losses and loss adjustment expenses		-			-			478,952			-			478,952
Net acquisition expenses		-			-			68,065			-			68,065
Net changes in fair value of derivatives		-			-			748			-			748
Operating expenses		10,049			202			24,005			-			34,256
Net foreign currency exchange losses (gains)		1			-			802			-			803
Interest expense		53			9,533			-			(53	)		9,533
Total expenses		10,103			9,735			572,572			(53	)		592,357
Income (loss) before income taxes		(11,792	)		(9,571	)		(155,753	)		-			(177,116	)
Income tax expense (benefit)		(600	)		(3,263	)		4,340			-			477
Income (loss) before equity in earnings of subsidiaries		(11,192	)		(6,308	)		(160,093	)		-			(177,593	)
Equity in earnings of subsidiaries		(166,401	)		13,834			7,573			144,994			-
Net income (loss)	$	(177,593	)	$	7,526		$	(152,520	)	$	144,994		$	(177,593	)
Other comprehensive income, net of deferred taxes		64,522			23,103			87,625			(110,728	)		64,522
Comprehensive income (loss)	$	(113,071	)	$	30,629		$	(64,895	)	$	34,266		$	(113,071	)

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(5,698	)	$	(5,161	)	$	(48,326	)	$	-			$	(59,185	)
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			395,269			-				395,269
Proceeds from sale of short-term investments		-			-			20,597			-				20,597
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			40			179,728			-				179,768
Proceeds from maturity of short-term investments		-			-			577,296			-				577,296
Acquisition of fixed maturity available-for-sale securities		-			-			(172,110	)		-				(172,110	)
Acquisition of short-term investments		-			-			(168,542	)		-				(168,542	)
Dividends from subsidiaries		70,000			-			-			(70,000	)			-
Net cash provided by (used in) investing activities		70,000			40			832,238			(70,000	)			832,278
Financing Activities:
Dividends paid to common shareholders		(5,507	)		-			(70,000	)		70,000				(5,507	)
Repurchase of common shares		(89,935	)		-			-			-				(89,935	)
Proceeds from exercise of common share options		1,014			-			-			-				1,014
Net cash provided by (used in) financing activities		(94,428	)		-			(70,000	)		70,000				(94,428	)
Effect of foreign currency exchange rate changes on cash		-			-			(5,192	)		-				(5,192	)
Net increase (decrease) in cash and cash equivalents		(30,126	)		(5,121	)		708,720			-				673,473
Cash and cash equivalents at beginning of period		47,791			108,260			636,459			-				792,510
Cash and cash equivalents at end of period	$	17,665		$	103,139		$	1,345,179		$	-			$	1,465,983

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(1,275	)	$	(6,482	)	$	41,045		$	-		$	33,288
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			353,402			-			353,402
Proceeds from sale of fixed maturity trading securities		-			-			20,413			-			20,413
Proceeds from sale of short-term investments		-			-			27,995			-			27,995
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			63			72,631			-			72,694
Proceeds from maturity of short-term investments		-			-			140,014			-			140,014
Acquisition of fixed maturity available-for-sale securities		-			-			(34,499	)		-			(34,499	)
Acquisition of short-term investments		-			-			(211,527	)		-			(211,527	)
Dividends from subsidiaries		280,000			-			-			(280,000	)		-
Investment in subsidiary		(120,000	)		(3,000	)		-			123,000			-
Inter-company loans		-			75,000			100,000			(175,000	)		-
Net cash provided by (used in) investing activities		160,000			72,063			468,429			(332,000	)		368,492
Financing Activities:
Dividends paid to common shareholders		(5,933	)		-			(280,000	)		280,000			(5,933	)
Repurchase of common shares		(33,907	)		-			-			-			(33,907	)
Purchase of common share options		(47,900	)		-			-			-			(47,900	)
Proceeds from exercise of common share options		1,132			-			-			-			1,132
Capital contribution from parent		-			-			123,000			(123,000	)		-
Inter-company loans		(75,000	)		-			(100,000	)		175,000			-
Net cash provided by (used in) financing activities		(161,608	)		-			(257,000	)		332,000			(86,608	)
Effect of foreign currency exchange rate changes on cash		-			-			15,724			-			15,724
Net increase (decrease) in cash and cash equivalents		(2,883	)		65,581			268,198			-			330,896
Cash and cash equivalents at beginning of period		45,035			7,347			935,495			-			987,877
Cash and cash equivalents at end of period	$	42,152		$	72,928		$	1,203,693		$	-		$	1,318,773

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Consolidated Statements of Operations (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011		Jun. 30, 2012		Jun. 30, 2011
Revenue:
Net premiums earned	$ 145,075		$ 172,436		$ 283,287		$ 355,317
Net investment income	26,155		33,965		54,707		66,343
Net realized gains (losses) on investments	24,978		(4,689)		47,317		(4,282)
Total other-than-temporary impairments	(335)		(548)		(91)		500
Portion of impairment losses recognized in accumulated other comprehensive income	(778)		(1,118)		(2,092)		(3,673)
Net impairment losses on investments	(1,113)		(1,666)		(2,183)		(3,173)
Other income (expense)	(191)		(60)		(670)		1,036
Total revenue	194,904		199,986		382,458		415,241
Expenses:
Net losses and loss adjustment expenses	67,117		159,357		146,313		478,952
Net acquisition expenses	30,200		34,115		60,857		68,065
Net changes in fair value of derivatives	0		4,474		0		748
Operating expenses	19,696		17,105		36,679		34,256
Net foreign currency exchange losses (gains)	(310)		614		222		803
Interest expense	4,774		4,767		9,546		9,533
Total expenses	121,477		220,432		253,617		592,357
Income (loss) before income taxes	73,427		(20,446)		128,841		(177,116)
Income tax expense (benefit)	5,895		(45)		8,022		477
Net income (loss)	67,532		(20,401)		120,819		(177,593)
Earnings (loss) per common share:
Basic earnings (loss) per common share (in dollars per share)	$ 1.98		$ (0.55)		$ 3.48		$ (4.75)
Diluted earnings (loss) per common share (in dollars per share)	$ 1.97	[1]	$ (0.55)	[1]	$ 3.46	[1]	$ (4.75)	[1]
Shareholder dividends:
Common shareholder dividends declared	$ 2,667		$ 2,969		$ 5,507		$ 5,933
Dividends declared per common share (in dollars per share)	$ 0.08		$ 0.08		$ 0.16		$ 0.16

[1] During a period of loss, the basic weighted average common shares outstanding is used in the denominator of the diluted loss per common share computation as the effect of including potential dilutive shares would be anti-dilutive.

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Credit Facilities

6 Months Ended

Jun. 30, 2012

Credit Facilities [Abstract]

Credit Facilities

5.           Credit Facilities

Syndicated Credit Facility

On June 24, 2011, we entered into an amended and restated three-year $300.0 million credit facility (the "Syndicated Credit Facility") that consists of a $100.0 million unsecured senior credit facility available for revolving borrowings and letters of credit and a $200.0 million secured senior credit facility available for letters of credit.  The Syndicated Credit Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the Syndicated Credit Facility.

Letter of Credit Facility

On June 30, 2011, our reinsurance subsidiaries entered into a letter of credit facility in the maximum aggregate amount of $100.0 million (the "LOC Facility") that expires on December 31, 2013.  Under the terms of the LOC Facility, up to $100.0 million is available for the issuance of letters of credit to support reinsurance obligations of our reinsurance subsidiaries.  The LOC Facility contains customary representations, warranties and covenants.  We are in compliance with the covenants under the LOC Facility.

We had no cash borrowings under the Syndicated Credit Facility during the six months ended June 30, 2012.  The following table summarizes the outstanding letters of credit and the cash and cash equivalents and investments held in trust to collateralize the letters of credit issued as of June 30, 2012 ($ in thousands):

	Letters of Credit				Collateral
	Capacity		Issued		Cash and Cash Equivalents		Investments		Total
Syndicated Credit Facility:
Secured	$	200,000	$	101,399	$	118,287	$	-	$	118,287
Unsecured		100,000		-		-		-		-
Total Syndicated Credit Facility		300,000		101,399		118,287		-		118,287
LOC Facility		100,000		36,273		32,010		13,268		45,278
Total	$	400,000	$	137,672	$	150,297	$	13,268	$	163,565

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Derivative Instruments

6 Months Ended

Jun. 30, 2012

Derivative Instruments [Abstract]

Derivative Instruments

4.           Derivative Instruments

At December 31, 2011 and during the period January 1, 2012 through June 30, 2012, we held no derivative instruments.  In prior periods, including the six months ended June 30, 2011, we held derivative instruments.  Our derivative instruments are recorded in the consolidated balance sheets at fair value as other assets or other liabilities, with changes in fair values and realized gains and losses recognized in net changes in fair value of derivatives in the consolidated statements of operations.  None of our derivatives were designated as hedges under current accounting guidance.  Our objectives for entering into derivative agreements are as follows:

Interest Rate Options

We use interest rate options within our portfolio of fixed maturity investments to manage our exposure to interest rate risk.

Commodity Options

We use commodity options to hedge certain underwriting risks.

Other Derivative Instrument

We use other derivative instruments to hedge certain underwriting risks.

In August 2008, we entered into a derivative agreement with Topiary Capital Limited ("Topiary"), a Cayman Islands special purpose vehicle, that provided us with the ability to recover up to $200.0 million if two catastrophic events involving U.S. wind, U.S. earthquake, European wind or Japanese earthquake occurred that met specified loss criteria during any of three annual periods commencing August 1, 2008.  The derivative agreement with Topiary expired on July 31, 2011 and no recovery was made.

Expense related to our other derivative instrument recorded in net changes in fair value of derivatives was $4.5 million and $0.7 million for the three and six months ended June 30, 2011.

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Statutory Regulations and Dividend Capacity (Tables)

6 Months Ended

Jun. 30, 2012

Statutory Regulations And Dividend Capacity [Abstract]

Maximum Dividends Payable

The laws and regulations of Bermuda and the United States include certain restrictions on the amount of dividends that can be paid by Platinum Bermuda and Platinum US to their respective parent companies, Platinum Holdings and Platinum Finance, without the prior approval of the relevant regulatory authorities.  Based on regulatory restrictions, the maximum amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval is as follows ($ in thousands):

Platinum Bermuda	$286,574
Platinum US	52,992
Total	$339,566

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Basis of Presentation and Significant Accounting Policies (Policies)

6 Months Ended

Jun. 30, 2012

Basis of Presentation and Significant Accounting Policies [Abstract]

Nature of Operations

Platinum Underwriters Holdings, Ltd. ("Platinum Holdings") is a holding company domiciled in Bermuda.  Through our reinsurance subsidiaries, we provide property and marine, casualty and finite risk reinsurance coverages to a diverse clientele of insurers and select reinsurers on a worldwide basis.

Consolidation Policy

Platinum Holdings and its consolidated subsidiaries (collectively, the "Company") include Platinum Holdings, Platinum Underwriters Bermuda, Ltd. ("Platinum Bermuda"), Platinum Underwriters Reinsurance, Inc. ("Platinum US"), Platinum Underwriters Finance, Inc. ("Platinum Finance"), Platinum Regency Holdings ("Platinum Regency") and Platinum Administrative Services, Inc.  The terms "we," "us," and "our" refer to the Company, unless the context otherwise indicates.

Platinum Regency is an intermediate holding company based in Ireland and a wholly owned subsidiary of Platinum Holdings.  Platinum Finance is an intermediate holding company based in the U.S. and a wholly owned subsidiary of Platinum Regency.  We operate through two licensed reinsurance subsidiaries, Platinum Bermuda, a Bermuda reinsurance company, and Platinum US, a U.S. reinsurance company.   Platinum Bermuda is a wholly owned subsidiary of Platinum Holdings and Platinum US is a wholly owned subsidiary of Platinum Finance.  Platinum Administrative Services, Inc. is a subsidiary that provides administrative support services to the Company.

The consolidated financial statements have been prepared in conformity with accounting principles generally accepted in the United States of America ("U.S. GAAP") for interim financial information.  Accordingly, they do not include all the information and footnotes required by U.S. GAAP for complete financial statements.  All material inter-company transactions and accounts have been eliminated in preparing these consolidated financial statements.  The consolidated financial statements included in this report as of  June 30, 2012 and for the three and six months ended June 30, 2012 and 2011 are unaudited and include all adjustments consisting of normal recurring items that management considers necessary for a fair presentation under U.S. GAAP.  These consolidated financial statements should be read in conjunction with the consolidated financial statements and related notes included in our Annual Report on Form 10-K for the year ended December 31, 2011.

Use of Estimates

The preparation of financial statements requires us 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 may differ materially from these estimates.  The major estimates used in the preparation of the Company's consolidated financial statements, and therefore considered to be critical accounting estimates, include, but are not limited to, premiums written and earned, unpaid losses and loss adjustment expenses ("LAE"), reinsurance recoverable, valuation of investments and income taxes.  In addition, estimates are used to evaluate risk transfer for assumed and ceded reinsurance transactions.  Results of changes in estimates are reflected in results of operations in the period in which the change is made.  The results of operations for any interim period are not necessarily indicative of results for the full year.

Recently Issued Accounting Standards

In December 2011, the Financial Accounting Standards Board (the "FASB") issued Accounting Standards Update ("ASU") No. 2011-12, "Comprehensive Income: Deferral of the Effective Date for Amendments to the Presentation of Reclassification of Items Out of Accumulated Other Comprehensive Income in Accounting Standards Update No. 2011-05" ("ASU 2011-12").  ASU 2011-12 defers the presentation on the face of the financial statements of the effects of reclassifications of the components of net income and other comprehensive income out of accumulated other comprehensive income for all periods.  None of the other requirements of ASU 2011-05, "Presentation of Comprehensive Income" ("ASU 2011-05") issued in June 2011 are affected by ASU 2011-12.  ASU 2011-05 requires entities to report components of comprehensive income in either a continuous statement of comprehensive income or two separate but consecutive statements.  Under the continuous statement approach, the statement would include the components and total of net income, the components and total of other comprehensive income and the total of comprehensive income.  Under the two statement approach, the first statement would include the components and total of net income and the second statement would include the components and total of other comprehensive income and the total of comprehensive income.  ASU 2011-05 does not change the items that must be reported in other comprehensive income.  ASU 2011-05 is effective retrospectively for interim and annual periods beginning after December 15, 2011, with early adoption permitted.  We adopted the guidance as of January 1, 2012 and included a separate statement of comprehensive income (loss) in our financial statements.  The separate statement of comprehensive income (loss) incorporated the effects of reclassification adjustments recognized in our statement of operations.

In May 2011, the FASB issued ASU No. 2011-04, "Amendments to Achieve Common Fair Value Measurement and Disclosure Requirement in U.S. GAAP and IFRSs" ("ASU 2011-04").  ASU 2011-04 does not extend the use of fair value but, rather, provides guidance about how fair value should be applied where it already is required and permitted under U.S. GAAP or International Financial Reporting Standards ("IFRS").  For U.S. GAAP, most of the changes are clarifications of existing guidance or wording changes to align with IFRS.   ASU 2011-04 is effective on a prospective basis for interim and annual periods beginning after December 15, 2011, with early adoption not permitted.  In the period of adoption, a reporting entity is required to disclose a change, if any, in valuation technique and related inputs that result from applying ASU 2011-04 and to quantify the total effect, if practicable.  We adopted the guidance as of January 1, 2012 and there were no changes in valuation technique or inputs. Additional disclosures required under ASU 2011-04 have been reflected in Note 3.

In October 2010, the FASB issued ASU No. 2010-26, "Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts" ("ASU 2010-26").  ASU 2010-26 modifies the types of costs that may be deferred, allowing insurance companies to only defer costs directly related to successful acquisition of new or renewal contracts.  These costs include incremental direct costs of successful contracts, the portion of employees' salaries and benefits related to time spent on acquisition activities for successful contracts and other costs incurred in the acquisition of contracts.  Additional disclosure of the type of acquisition costs capitalized is also required.  ASU 2010-26 is effective on a prospective basis for interim and annual reporting periods beginning after December 15, 2011, with early adoption permitted as of the beginning of a company's annual period.  We adopted the guidance as of January 1, 2012 and there was no impact on our financial statements.

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Statutory Regulations and Dividend Capacity

6 Months Ended

Jun. 30, 2012

Statutory Regulations And Dividend Capacity [Abstract]

Statutory Regulations and Dividend Capacity

8.           Statutory Regulations and Dividend Capacity

The laws and regulations of Bermuda and the United States include certain restrictions on the amount of dividends that can be paid by Platinum Bermuda and Platinum US to their respective parent companies, Platinum Holdings and Platinum Finance, without the prior approval of the relevant regulatory authorities.  Based on regulatory restrictions, the maximum amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval is as follows ($ in thousands):

Platinum Bermuda	$286,574
Platinum US	52,992
Total	$339,566

During the six months ended June 30, 2012, dividends of $70.0 million were paid by Platinum Bermuda to Platinum Holdings.  Therefore, as of June 30, 2012, the remaining amount available for payment of dividends by our reinsurance subsidiaries during 2012 without prior regulatory approval was $269.6 million.  Subsequent to June 30, 2012, Platinum Bermuda declared and paid a dividend of $50.0 million to Platinum Holdings.

There are no regulatory restrictions on the amount of dividends that Platinum Finance can pay to Platinum Regency. Irish law prohibits Platinum Regency from declaring a dividend to Platinum Holdings unless it has "profits available for distribution."  The determination of whether a company has profits available for distribution is based on its accumulated realized profits less its accumulated realized losses.

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Income Taxes

6 Months Ended

Jun. 30, 2012

Income Taxes [Abstract]

Income Taxes

6.           Income Taxes

We provide for income tax expense or benefit based upon income reported in the consolidated financial statements and the provisions of currently enacted tax laws.  Platinum Holdings and Platinum Bermuda are incorporated under the laws of Bermuda and are subject to Bermuda law with respect to taxation.  Under current Bermuda law, Platinum Holdings and Platinum Bermuda are not taxed on any Bermuda income or capital gains and they have received an assurance from the Bermuda Minister of Finance that if any legislation is enacted in Bermuda that would impose tax computed on profits or income, or computed on any capital asset, gain or appreciation, or any tax in the nature of estate duty or inheritance tax, then the imposition of any such tax will not be applicable to Platinum Holdings or Platinum Bermuda or any of their respective operations, shares, debentures or other obligations until March 31, 2035.  Platinum Holdings has subsidiaries based in the United States and Ireland that are subject to the tax laws thereof.

The 2003 income tax return of our U.S.-based subsidiaries is currently under examination by the U.S. Internal Revenue Service. The income tax returns that remain open to examination are for calendar years 2008 and forward.

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Share Repurchases

6 Months Ended

Jun. 30, 2012

Share Repurchases [Abstract]

Share Repurchases

7.           Share Repurchases

Our Board of Directors has authorized the repurchase of our common shares through a share repurchase program.  Since the program was established, our Board of Directors has approved increases in the repurchase program from time to time, most recently on July 23, 2012, to result in authority as of such date to repurchase up to a total of $250.0 million of our common shares.

During the six months ended June 30, 2012, in accordance with the share repurchase program, we repurchased 2,464,471 of our common shares in the open market for an aggregate cost of $89.9 million at a weighted average cost including commissions of $36.49 per share.  The shares we repurchased were canceled.

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Operating Segment Information

6 Months Ended

Jun. 30, 2012

Operating Segment Information [Abstract]

Operating Segment Information

9.           Operating Segment Information

We have organized our worldwide reinsurance business into the following three operating segments: Property and Marine, Casualty and Finite Risk.  The Property and Marine segment includes principally property and marine reinsurance coverages that are written in the United States and international markets.  This operating segment includes property reinsurance, crop reinsurance and marine and aviation reinsurance.  The Property and Marine segment includes property catastrophe and marine excess-of-loss reinsurance contracts, property and marine per-risk excess-of-loss reinsurance contracts and property proportional reinsurance contracts.  The Casualty segment includes reinsurance contracts that cover general and product liability, professional liability, accident and health, umbrella liability, workers' compensation, casualty clash, automobile liability, surety, trade credit, and political risk.  We generally seek to write casualty reinsurance on an excess-of-loss basis.  The Finite Risk operating segment includes principally structured reinsurance contracts with ceding companies whose needs may not be met efficiently through traditional reinsurance products.  In exchange for contractual features that limit our risk, reinsurance contracts that we include in our Finite Risk segment typically provide the potential for significant profit commission to the ceding company.  The classes of risks underwritten through our finite risk contracts are generally consistent with the classes covered by our traditional products.  The finite risk reinsurance contracts that we underwrite generally provide prospective protection, meaning coverage is provided for losses that are incurred after inception of the contract, as contrasted with retrospective coverage, which covers losses that are incurred prior to inception of the contract.  The three main categories of finite risk contracts are quota share, multi-year excess-of-loss and whole account aggregate stop loss.

In managing our operating segments, we use measures such as net underwriting income and underwriting ratios to evaluate segment performance.  We do not allocate assets or certain income and expenses such as net investment income, net realized gains and losses on investments, net impairment losses on investments, net changes in fair value of derivatives, net foreign currency exchange gains and losses, interest expense and certain corporate expenses by segment.  The measures we use in evaluating our operating segments should not be used as a substitute for measures determined under U.S. GAAP.  Underwriting ratios are considered to be non-GAAP measures and are calculated for net losses and LAE, net acquisition expense and net underwriting expense.  The ratios are calculated by dividing the related expense by net earned premiums.  The following table summarizes underwriting activity and ratios for the three operating segments, together with a reconciliation of segment underwriting income (loss) to income (loss) before income taxes for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	61,695		$	72,678		$	7,086		$	141,459
Net premiums earned		62,838			75,746			6,491			145,075
Net losses and loss adjustment expenses		17,653			45,851			3,613			67,117
Net acquisition expenses		8,721			18,487			2,992			30,200
Other underwriting expenses		7,454			5,625			267			13,346
Segment underwriting income (loss)	$	29,010		$	5,783		$	(381	)		34,412
Net investment income											26,155
Net realized gains (losses) on investments											24,978
Net impairment losses on investments											(1,113	)
Other income (expense)											(191	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(6,350	)
Net foreign currency exchange (losses) gains											310
Interest expense											(4,774	)
Income (loss) before income taxes										$	73,427
Underwriting ratios:
Net loss and loss adjustment expense		28.1	%		60.5	%		55.7	%		46.3	%
Net acquisition expense		13.9	%		24.4	%		46.1	%		20.8	%
Other underwriting expense		11.9	%		7.4	%		4.1	%		9.2	%
Combined		53.9	%		92.3	%		105.9	%		76.3	%
	Three Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	54,411		$	69,234		$	2,242		$	125,887
Net premiums earned		91,852			77,104			3,480			172,436
Net losses and loss adjustment expenses		116,543			43,868			(1,054	)		159,357
Net acquisition expenses		12,009			18,144			3,962			34,115
Other underwriting expenses		7,274			4,829			264			12,367
Segment underwriting income (loss)	$	(43,974	)	$	10,263		$	308			(33,403	)
Net investment income											33,965
Net realized gains (losses) on investments											(4,689	)
Net impairment losses on investments											(1,666	)
Other income (expense)											(60	)
Net changes in fair value of derivatives											(4,474	)
Corporate expenses not allocated to segments											(4,738	)
Net foreign currency exchange (losses) gains											(614	)
Interest expense											(4,767	)
Income (loss) before income taxes										$	(20,446	)
Underwriting ratios:
Net loss and loss adjustment expense		126.9	%		56.9	%		(30.3	%)		92.4	%
Net acquisition expense		13.1	%		23.5	%		113.9	%		19.8	%
Other underwriting expense		7.9	%		6.3	%		7.6	%		7.2	%
Combined		147.9	%		86.7	%		91.2	%		119.4	%

	Six Months Ended June 30, 2012
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	129,848		$	147,078		$	8,194		$	285,120
Net premiums earned		124,166			151,512			7,609			283,287
Net losses and loss adjustment expenses		58,590			86,887			836			146,313
Net acquisition expenses		17,956			35,862			7,039			60,857
Other underwriting expenses		14,289			10,661			458			25,408
Segment underwriting income (loss)	$	33,331		$	18,102		$	(724	)		50,709
Net investment income											54,707
Net realized gains (losses) on investments											47,317
Net impairment losses on investments											(2,183	)
Other income (expense)											(670	)
Net changes in fair value of derivatives											-
Corporate expenses not allocated to segments											(11,271	)
Net foreign currency exchange (losses) gains											(222	)
Interest expense											(9,546	)
Income (loss) before income taxes										$	128,841
Underwriting ratios:
Net loss and loss adjustment expense		47.2	%		57.3	%		11.0	%		51.6	%
Net acquisition expense		14.5	%		23.7	%		92.5	%		21.5	%
Other underwriting expense		11.5	%		7.0	%		6.0	%		9.0	%
Combined		73.2	%		88.0	%		109.5	%		82.1	%
	Six Months Ended June 30, 2011
	Property and Marine			Casualty			Finite Risk			Total
Net premiums written	$	166,213		$	149,753		$	4,706		$	320,672
Net premiums earned		189,757			157,928			7,632			355,317
Net losses and loss adjustment expenses		394,873			83,487			592			478,952
Net acquisition expenses		25,635			36,707			5,723			68,065
Other underwriting expenses		14,595			10,161			499			25,255
Segment underwriting income (loss)	$	(245,346	)	$	27,573		$	818			(216,955	)
Net investment income											66,343
Net realized gains (losses) on investments											(4,282	)
Net impairment losses on investments											(3,173	)
Other income (expense)											1,036
Net changes in fair value of derivatives											(748	)
Corporate expenses not allocated to segments											(9,001	)
Net foreign currency exchange (losses) gains											(803	)
Interest expense											(9,533	)
Income (loss) before income taxes										$	(177,116	)
Underwriting ratios:
Net loss and loss adjustment expense		208.1	%		52.9	%		7.8	%		134.8	%
Net acquisition expense		13.5	%		23.2	%		75.0	%		19.2	%
Other underwriting expense		7.7	%		6.4	%		6.5	%		7.1	%
Combined		229.3	%		82.5	%		89.3	%		161.1	%

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Operating Segment Information (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Segment Reporting Information [Line Items]
Net premiums written	$ 141,459	$ 125,887	$ 285,120	$ 320,672
Net premiums earned	145,075	172,436	283,287	355,317
Net losses and loss adjustment expenses	67,117	159,357	146,313	478,952
Net acquisition expenses	30,200	34,115	60,857	68,065
Other underwriting expenses	13,346	12,367	25,408	25,255
Segment underwriting income (loss)	34,412	(33,403)	50,709	(216,955)
Underwriting Ratios: [Abstract]
Net loss and loss adjustment expense	46.30%	92.40%	51.60%	134.80%
Net acquisition expense	20.80%	19.80%	21.50%	19.20%
Other underwriting expense	9.20%	7.20%	9.00%	7.10%
Combined	76.30%	119.40%	82.10%	161.10%
Reconciliation of Operating Profit (Loss) From Segments to Consolidated: [Abstract]
Net investment income	26,155	33,965	54,707	66,343
Net realized gains (losses) on investments	24,978	(4,689)	47,317	(4,282)
Net impairment losses on investments	(1,113)	(1,666)	(2,183)	(3,173)
Other income (expense)	(191)	(60)	(670)	1,036
Net changes in fair value of derivatives	0	(4,474)	0	(748)
Corporate expenses not allocated to segments	(6,350)	(4,738)	(11,271)	(9,001)
Net foreign currency exchange (losses) gains	310	(614)	(222)	(803)
Interest expense	(4,774)	(4,767)	(9,546)	(9,533)
Income (loss) before income taxes	73,427	(20,446)	128,841	(177,116)
Property and Marine [Member]
Segment Reporting Information [Line Items]
Net premiums written	61,695	54,411	129,848	166,213
Net premiums earned	62,838	91,852	124,166	189,757
Net losses and loss adjustment expenses	17,653	116,543	58,590	394,873
Net acquisition expenses	8,721	12,009	17,956	25,635
Other underwriting expenses	7,454	7,274	14,289	14,595
Segment underwriting income (loss)	29,010	(43,974)	33,331	(245,346)
Underwriting Ratios: [Abstract]
Net loss and loss adjustment expense	28.10%	126.90%	47.20%	208.10%
Net acquisition expense	13.90%	13.10%	14.50%	13.50%
Other underwriting expense	11.90%	7.90%	11.50%	7.70%
Combined	53.90%	147.90%	73.20%	229.30%
Casualty [Member]
Segment Reporting Information [Line Items]
Net premiums written	72,678	69,234	147,078	149,753
Net premiums earned	75,746	77,104	151,512	157,928
Net losses and loss adjustment expenses	45,851	43,868	86,887	83,487
Net acquisition expenses	18,487	18,144	35,862	36,707
Other underwriting expenses	5,625	4,829	10,661	10,161
Segment underwriting income (loss)	5,783	10,263	18,102	27,573
Underwriting Ratios: [Abstract]
Net loss and loss adjustment expense	60.50%	56.90%	57.30%	52.90%
Net acquisition expense	24.40%	23.50%	23.70%	23.20%
Other underwriting expense	7.40%	6.30%	7.00%	6.40%
Combined	92.30%	86.70%	88.00%	82.50%
Finite Risk [Member]
Segment Reporting Information [Line Items]
Net premiums written	7,086	2,242	8,194	4,706
Net premiums earned	6,491	3,480	7,609	7,632
Net losses and loss adjustment expenses	3,613	(1,054)	836	592
Net acquisition expenses	2,992	3,962	7,039	5,723
Other underwriting expenses	267	264	458	499
Segment underwriting income (loss)	$ (381)	$ 308	$ (724)	$ 818
Underwriting Ratios: [Abstract]
Net loss and loss adjustment expense	55.70%	(30.30%)	11.00%	7.80%
Net acquisition expense	46.10%	113.90%	92.50%	75.00%
Other underwriting expense	4.10%	7.60%	6.00%	6.50%
Combined	105.90%	91.20%	109.50%	89.30%

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Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurement of Assets and Liabilities

The following table presents the fair value hierarchy for those financial assets and liabilities measured at fair value on a recurring basis by the Company as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Fair Value Measurement Using:
	Total		Level 1		Level 2		Level 3
June 30, 2012:
Investments:
U.S. Government	$	5,011	$	5,011	$	-	$	-
U.S. Government agencies		10,164		-		10,164		-
Municipal bonds		1,352,837		-		1,352,837		-
Non-U.S. governments		208,142		55,431		152,711		-
Corporate bonds		350,402		-		350,402		-
Commercial mortgage-backed securities		201,356		-		201,356		-
Residential mortgage-backed securities		276,282		-		268,821		7,461
Asset-backed securities		19,640		-		18,074		1,566
Short-term investments		167,778		-		167,778		-
Total	$	2,591,612	$	60,442	$	2,522,143	$	9,027
December 31, 2011:
Investments:
U.S. Government	$	5,083	$	5,083	$	-	$	-
U.S. Government agencies		100,259		-		100,259		-
Municipal bonds		1,660,760		-		1,660,760		-
Non-U.S. governments		196,392		55,561		140,831		-
Corporate bonds		349,548		-		349,548		-
Commercial mortgage-backed securities		204,609		-		204,609		-
Residential mortgage-backed securities		251,627		-		243,481		8,146
Asset-backed securities		20,422		-		18,555		1,867
Short-term investments		588,834		34,894		553,940		-
Total	$	3,377,534	$	95,538	$	3,271,983	$	10,013

Fair Value Assets Measured on Recurring Basis Unobservable Input Reconciliation

	Three Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, April 1	$	5,564		$	1,723		$	-	$	7,287
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(641	)		-			-		(641	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		285			(157	)		-		128
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		-			-			-		-
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

	Three Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, April 1	$	3,305		$	909		$	1,257		$	5,471
Purchases		-			-			-			-
Issuances		-			-			-			-
Settlements		-			-			2,427			2,427
Sales, maturities and paydowns		(89	)		-			-			(89	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(4,474	)		(4,474	)
Total net unrealized gains (losses) included in comprehensive income (loss)		(407	)		525			-			118
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(4,474	)	$	(4,474	)

The following tables reconcile the beginning and ending balance for our Level 3 financial assets and liabilities measured at fair value on a recurring basis for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, January 1	$	8,146		$	1,867		$	-	$	10,013
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(734	)		-			-		(734	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		50			(301	)		-		(251	)
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		(2,254	)		-			-		(2,254	)
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

	Six Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, January 1	$	2,449		$	1,069		$	(4,871	)	$	(1,353	)
Purchases		-			-			4,829			4,829
Issuances		-			-			-			-
Settlements		-			-			-			-
Sales, maturities and paydowns		(165	)		-			-			(165	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(748	)		(748	)
Total net unrealized gains (losses) included in comprehensive income (loss)		525			365			-			890
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(748	)	$	(748	)

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Condensed Consolidating Financial Information (Tables)

6 Months Ended

Jun. 30, 2012

Condensed Consolidating Financial Information [Abstract]

Schedule of Condensed Financial Statements

The following tables present the condensed consolidating financial information for Platinum Holdings, Platinum Finance and the non-guarantor subsidiaries of Platinum Holdings as of June 30, 2012 and December 31, 2011 and for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

Condensed Consolidating Balance Sheet

June 30, 2012

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	232	$	2,591,380	$	-		$	2,591,612
Investment in subsidiaries		1,700,293		655,570		512,671		(2,868,534	)		-
Cash and cash equivalents		17,665		103,139		1,345,179		-			1,465,983
Reinsurance assets		-		-		288,698		-			288,698
Other assets		8,379		5,362		64,903		-			78,644
Total assets	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,408,816	$	-		$	2,408,816
Debt obligations		-		250,000		-		-			250,000
Other liabilities		4,510		1,632		38,152		-			44,294
Total liabilities	$	4,510	$	251,632	$	2,446,968	$	-		$	2,703,110
Shareholders' Equity
Common shares	$	332	$	-	$	8,000	$	(8,000	)	$	332
Additional paid-in capital		227,482		213,405		2,020,382		(2,233,787	)		227,482
Accumulated other comprehensive income		148,562		43,804		192,357		(236,161	)		148,562
Retained earnings		1,345,451		255,462		135,124		(390,586	)		1,345,451
Total shareholders' equity	$	1,721,827	$	512,671	$	2,355,863	$	(2,868,534	)	$	1,721,827
Total liabilities and shareholders' equity	$	1,726,337	$	764,303	$	4,802,831	$	(2,868,534	)	$	4,424,937

Condensed Consolidating Balance Sheet

December 31, 2011

	Platinum Holdings		Platinum Finance		Non-guarantor Subsidiaries		Consolidating Adjustments			Consolidated
ASSETS
Total investments	$	-	$	274	$	3,377,260	$	-		$	3,377,534
Investment in subsidiaries		1,638,898		621,041		484,561		(2,744,500	)		-
Cash and cash equivalents		47,791		108,260		636,459		-			792,510
Reinsurance assets		-		-		297,374		-			297,374
Other assets		6,229		6,620		71,344		-			84,193
Total assets	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611
LIABILITIES AND SHAREHOLDERS' EQUITY
Liabilities
Reinsurance liabilities	$	-	$	-	$	2,573,701	$	-		$	2,573,701
Debt obligations		-		250,000		-		-			250,000
Other liabilities		2,059		1,634		33,358		-			37,051
Total liabilities	$	2,059	$	251,634	$	2,607,059	$	-		$	2,860,752
Shareholders' Equity
Common shares	$	355	$	-	$	8,000	$	(8,000	)	$	355
Additional paid-in capital		313,730		213,342		2,000,335		(2,213,677	)		313,730
Accumulated other comprehensive income		146,635		41,277		187,903		(229,180	)		146,635
Retained earnings		1,230,139		229,942		63,701		(293,643	)		1,230,139
Total shareholders' equity	$	1,690,859	$	484,561	$	2,259,939	$	(2,744,500	)	$	1,690,859
Total liabilities and shareholders' equity	$	1,692,918	$	736,195	$	4,866,998	$	(2,744,500	)	$	4,551,611

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	145,075		$	-		$	145,075
Net investment income		2			12			26,141			-			26,155
Net realized gains (losses) on investments		-			-			24,978			-			24,978
Net impairment losses on investments		-			-			(1,113	)		-			(1,113	)
Other income (expense)		991			-			(1,182	)		-			(191	)
Total revenue		993			12			193,899			-			194,904
Expenses:
Net losses and loss adjustment expenses		-			-			67,117			-			67,117
Net acquisition expenses		-			-			30,200			-			30,200
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		5,834			67			13,795			-			19,696
Net foreign currency exchange losses (gains)		-			-			(310	)		-			(310	)
Interest expense		-			4,774			-			-			4,774
Total expenses		5,834			4,841			110,802			-			121,477
Income (loss) before income taxes		(4,841	)		(4,829	)		83,097			-			73,427
Income tax expense (benefit)		-			(1,627	)		7,522			-			5,895
Income (loss) before equity in earnings of subsidiaries		(4,841	)		(3,202	)		75,575			-			67,532
Equity in earnings of subsidiaries		72,373			15,004			11,802			(99,179	)		-
Net income (loss)	$	67,532		$	11,802		$	87,377		$	(99,179	)	$	67,532
Other comprehensive income, net of deferred taxes		8,104			3,221			11,326			(14,547	)		8,104
Comprehensive income (loss)	$	75,636		$	15,023		$	98,703		$	(113,726	)	$	75,636

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Three Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	172,436		$	-		$	172,436
Net investment income		1			(7	)		33,971			-			33,965
Net realized gains (losses) on investments		-			-			(4,689	)		-			(4,689	)
Net impairment losses on investments		-			-			(1,666	)		-			(1,666	)
Other income (expense)		(967	)		3			904			-			(60	)
Total revenue		(966	)		(4	)		200,956			-			199,986
Expenses:
Net losses and loss adjustment expenses		-			-			159,357			-			159,357
Net acquisition expenses		-			-			34,115			-			34,115
Net changes in fair value of derivatives		-			-			4,474			-			4,474
Operating expenses		5,826			143			11,136			-			17,105
Net foreign currency exchange losses (gains)		-			-			614			-			614
Interest expense		-			4,767			-			-			4,767
Total expenses		5,826			4,910			209,696			-			220,432
Income (loss) before income taxes		(6,792	)		(4,914	)		(8,740	)		-			(20,446	)
Income tax expense (benefit)		-			(1,679	)		1,634			-			(45	)
Income (loss) before equity in earnings of subsidiaries		(6,792	)		(3,235	)		(10,374	)		-			(20,401	)
Equity in earnings of subsidiaries		(13,609	)		5,047			1,835			6,727			-
Net income (loss)	$	(20,401	)	$	1,812		$	(8,539	)	$	6,727		$	(20,401	)
Other comprehensive income, net of deferred taxes		52,518			22,054			74,574			(96,628	)		52,518
Comprehensive income (loss)	$	32,117		$	23,866		$	66,035		$	(89,901	)	$	32,117

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	283,287		$	-		$	283,287
Net investment income		3			(7	)		54,711			-			54,707
Net realized gains (losses) on investments		-			-			47,317			-			47,317
Net impairment losses on investments		-			-			(2,183	)		-			(2,183	)
Other income (expense)		2,187			1			(2,858	)		-			(670	)
Total revenue		2,190			(6	)		380,274			-			382,458
Expenses:
Net losses and loss adjustment expenses		-			-			146,313			-			146,313
Net acquisition expenses		-			-			60,857			-			60,857
Net changes in fair value of derivatives		-			-			-			-			-
Operating expenses		10,775			133			25,771			-			36,679
Net foreign currency exchange losses (gains)		-			-			222			-			222
Interest expense		-			9,546			-			-			9,546
Total expenses		10,775			9,679			233,163			-			253,617
Income (loss) before income taxes		(8,585	)		(9,685	)		147,111			-			128,841
Income tax expense (benefit)		-			(3,265	)		11,287			-			8,022
Income (loss) before equity in earnings of subsidiaries		(8,585	)		(6,420	)		135,824			-			120,819
Equity in earnings of subsidiaries		129,404			31,941			25,521			(186,866	)		-
Net income (loss)	$	120,819		$	25,521		$	161,345		$	(186,866	)	$	120,819
Other comprehensive income, net of deferred taxes		1,927			2,527			4,454			(6,981	)		1,927
Comprehensive income (loss)	$	122,746		$	28,048		$	165,799		$	(193,847	)	$	122,746

Condensed Consolidating Statement of Operations and Comprehensive Income (Loss)

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Revenue:
Net premiums earned	$	-		$	-		$	355,317		$	-		$	355,317
Net investment income		3			46			66,347			(53	)		66,343
Net realized gains (losses) on investments		-			-			(4,282	)		-			(4,282	)
Net impairment losses on investments		-			-			(3,173	)		-			(3,173	)
Other income (expense)		(1,692	)		118			2,610			-			1,036
Total revenue		(1,689	)		164			416,819			(53	)		415,241
Expenses:
Net losses and loss adjustment expenses		-			-			478,952			-			478,952
Net acquisition expenses		-			-			68,065			-			68,065
Net changes in fair value of derivatives		-			-			748			-			748
Operating expenses		10,049			202			24,005			-			34,256
Net foreign currency exchange losses (gains)		1			-			802			-			803
Interest expense		53			9,533			-			(53	)		9,533
Total expenses		10,103			9,735			572,572			(53	)		592,357
Income (loss) before income taxes		(11,792	)		(9,571	)		(155,753	)		-			(177,116	)
Income tax expense (benefit)		(600	)		(3,263	)		4,340			-			477
Income (loss) before equity in earnings of subsidiaries		(11,192	)		(6,308	)		(160,093	)		-			(177,593	)
Equity in earnings of subsidiaries		(166,401	)		13,834			7,573			144,994			-
Net income (loss)	$	(177,593	)	$	7,526		$	(152,520	)	$	144,994		$	(177,593	)
Other comprehensive income, net of deferred taxes		64,522			23,103			87,625			(110,728	)		64,522
Comprehensive income (loss)	$	(113,071	)	$	30,629		$	(64,895	)	$	34,266		$	(113,071	)

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2012

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(5,698	)	$	(5,161	)	$	(48,326	)	$	-			$	(59,185	)
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			395,269			-				395,269
Proceeds from sale of short-term investments		-			-			20,597			-				20,597
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			40			179,728			-				179,768
Proceeds from maturity of short-term investments		-			-			577,296			-				577,296
Acquisition of fixed maturity available-for-sale securities		-			-			(172,110	)		-				(172,110	)
Acquisition of short-term investments		-			-			(168,542	)		-				(168,542	)
Dividends from subsidiaries		70,000			-			-			(70,000	)			-
Net cash provided by (used in) investing activities		70,000			40			832,238			(70,000	)			832,278
Financing Activities:
Dividends paid to common shareholders		(5,507	)		-			(70,000	)		70,000				(5,507	)
Repurchase of common shares		(89,935	)		-			-			-				(89,935	)
Proceeds from exercise of common share options		1,014			-			-			-				1,014
Net cash provided by (used in) financing activities		(94,428	)		-			(70,000	)		70,000				(94,428	)
Effect of foreign currency exchange rate changes on cash		-			-			(5,192	)		-				(5,192	)
Net increase (decrease) in cash and cash equivalents		(30,126	)		(5,121	)		708,720			-				673,473
Cash and cash equivalents at beginning of period		47,791			108,260			636,459			-				792,510
Cash and cash equivalents at end of period	$	17,665		$	103,139		$	1,345,179		$	-			$	1,465,983

Condensed Consolidating Statement of Cash Flows

For the Six Months Ended June 30, 2011

	Platinum Holdings			Platinum Finance			Non-guarantor Subsidiaries			Consolidating Adjustments			Consolidated
Net cash provided by (used in) operating activities	$	(1,275	)	$	(6,482	)	$	41,045		$	-		$	33,288
Investing Activities:
Proceeds from sale of fixed maturity available-for-sale securities		-			-			353,402			-			353,402
Proceeds from sale of fixed maturity trading securities		-			-			20,413			-			20,413
Proceeds from sale of short-term investments		-			-			27,995			-			27,995
Proceeds from maturity or paydown of fixed maturity available-for-sale securities		-			63			72,631			-			72,694
Proceeds from maturity of short-term investments		-			-			140,014			-			140,014
Acquisition of fixed maturity available-for-sale securities		-			-			(34,499	)		-			(34,499	)
Acquisition of short-term investments		-			-			(211,527	)		-			(211,527	)
Dividends from subsidiaries		280,000			-			-			(280,000	)		-
Investment in subsidiary		(120,000	)		(3,000	)		-			123,000			-
Inter-company loans		-			75,000			100,000			(175,000	)		-
Net cash provided by (used in) investing activities		160,000			72,063			468,429			(332,000	)		368,492
Financing Activities:
Dividends paid to common shareholders		(5,933	)		-			(280,000	)		280,000			(5,933	)
Repurchase of common shares		(33,907	)		-			-			-			(33,907	)
Purchase of common share options		(47,900	)		-			-			-			(47,900	)
Proceeds from exercise of common share options		1,132			-			-			-			1,132
Capital contribution from parent		-			-			123,000			(123,000	)		-
Inter-company loans		(75,000	)		-			(100,000	)		175,000			-
Net cash provided by (used in) financing activities		(161,608	)		-			(257,000	)		332,000			(86,608	)
Effect of foreign currency exchange rate changes on cash		-			-			15,724			-			15,724
Net increase (decrease) in cash and cash equivalents		(2,883	)		65,581			268,198			-			330,896
Cash and cash equivalents at beginning of period		45,035			7,347			935,495			-			987,877
Cash and cash equivalents at end of period	$	42,152		$	72,928		$	1,203,693		$	-		$	1,318,773

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Consolidated Statements of Comprehensive Income (Loss) (Unaudited) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011
Consolidated Statements of Comprehensive Income (Loss) (Unaudited) [Abstract]
Net income (loss)	$ 67,532	$ (20,401)	$ 120,819	$ (177,593)
Other comprehensive income, before deferred tax:
Net change in unrealized gains and losses on available-for-sale securities arising during the period	33,945	55,984	49,002	70,753
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments	(25,219)	6,744	(47,897)	3,036
Net impairment losses on investments	1,113	1,666	2,183	3,173
Other comprehensive income, before deferred tax	9,839	64,394	3,288	76,962
Deferred tax on components of other comprehensive income:
Net change in unrealized gains and losses on available-for-sale securities arising during the period	(2,823)	(9,680)	(2,883)	(10,443)
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments	1,194	(2,162)	1,754	(1,918)
Net impairment losses on investments	(106)	(34)	(232)	(79)
Deferred income tax expense	(1,735)	(11,876)	(1,361)	(12,440)
Other comprehensive income, net of deferred tax:
Net change in unrealized gains and losses on available-for-sale securities arising during the period	31,122	46,304	46,119	60,310
Reclassification adjustments:
Net realized (gains) losses on available-for-sale investments	(24,025)	4,582	(46,143)	1,118
Net impairment losses on investments	1,007	1,632	1,951	3,094
Other comprehensive income, net of deferred tax	8,104	52,518	1,927	64,522
Comprehensive income (loss)	$ 75,636	$ 32,117	$ 122,746	$ (113,071)

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Fair Value Measurements

6 Months Ended

Jun. 30, 2012

Fair Value Measurements [Abstract]

Fair Value Measurements

3.           Fair Value Measurements

The accounting guidance relating to fair value measurements addresses how a company should measure fair value when required to use a fair value measure for recognition or disclosure purposes.  The fair values of our financial assets and liabilities addressed by this guidance are determined primarily through the use of observable inputs.  Observable inputs reflect the assumptions market participants would use in pricing the asset or liability based on market data obtained from external independent sources.   Unobservable inputs reflect management's assumptions about what market participants' assumptions would be in pricing the asset or liability based on the best information available.   We classify our financial assets and liabilities in the fair value hierarchy based on the lowest level input that is significant to the fair value measurement.  This classification requires judgment in assessing the market and pricing methodologies for a particular security.  The fair value hierarchy is comprised of the following three levels:

Level 1: Valuations are based on unadjusted quoted prices in active markets for identical financial assets or liabilities;

Level 2: Valuations are based on prices obtained from independent index providers, pricing vendors or broker-dealers using observable inputs for financial assets and liabilities; and

Level 3: Valuations are based on unobservable inputs for assets and liabilities where there is little or no market activity.  Management's assumptions and/or internal valuation pricing models may be used to determine the fair value of financial assets or liabilities.

The following table presents the fair value hierarchy for those financial assets and liabilities measured at fair value on a recurring basis by the Company as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Fair Value Measurement Using:
	Total		Level 1		Level 2		Level 3
June 30, 2012:
Investments:
U.S. Government	$	5,011	$	5,011	$	-	$	-
U.S. Government agencies		10,164		-		10,164		-
Municipal bonds		1,352,837		-		1,352,837		-
Non-U.S. governments		208,142		55,431		152,711		-
Corporate bonds		350,402		-		350,402		-
Commercial mortgage-backed securities		201,356		-		201,356		-
Residential mortgage-backed securities		276,282		-		268,821		7,461
Asset-backed securities		19,640		-		18,074		1,566
Short-term investments		167,778		-		167,778		-
Total	$	2,591,612	$	60,442	$	2,522,143	$	9,027
December 31, 2011:
Investments:
U.S. Government	$	5,083	$	5,083	$	-	$	-
U.S. Government agencies		100,259		-		100,259		-
Municipal bonds		1,660,760		-		1,660,760		-
Non-U.S. governments		196,392		55,561		140,831		-
Corporate bonds		349,548		-		349,548		-
Commercial mortgage-backed securities		204,609		-		204,609		-
Residential mortgage-backed securities		251,627		-		243,481		8,146
Asset-backed securities		20,422		-		18,555		1,867
Short-term investments		588,834		34,894		553,940		-
Total	$	3,377,534	$	95,538	$	3,271,983	$	10,013

The fair values of our fixed maturity securities and short-term investments are generally based on prices obtained from independent index providers, pricing vendors or broker-dealers using observable inputs.  Fixed maturity securities and short-term investments are generally valued using the market approach.  The following table describes the valuation techniques, assumptions, and significant inputs used to determine the fair value of our financial assets and liabilities as well as their classification pursuant to the fair value hierarchy:

U.S. Government	The fair values of U.S. Government securities were based on quoted prices in active markets for identical assets.  The fair value measurements were classified as Level 1.
U.S Government agencies	Our U.S. Government agencies portfolio consisted of securities issued by financial institutions guaranteed by the Federal Deposit Insurance Corporation.  The observable inputs used to price these securities may include the spread above the risk-free yield curve, reported trades and broker-dealer quotes.  The fair value measurements were classified as Level 2.
Municipal bonds	The fair values of municipal bonds were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, benchmark securities, bids, credit risks and economic indicators.  The fair value measurements were classified as Level 2.
Non-U.S. governments	Our non-U.S. government bond portfolio consisted of securities issued primarily by governments, provinces, agencies and supranationals as well as debt issued by financial institutions that is guaranteed by non-U.S. governments.  The fair values of non-U.S. government securities were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades and broker-dealer quotes.  The fair value measurements were classified as Level 1 or Level 2.
Corporate bonds	The observable inputs used to price corporate issues may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, benchmark securities, bids, credit risks and industry and economic indicators.  The fair value measurements were classified as Level 2.
Commercial mortgage-backed securities	The fair values of CMBS were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2.
Residential mortgage-backed securities	Our RMBS portfolio was comprised of securities issued by U.S. Government agencies and by non-agency institutions.  The observable inputs used to price U.S. Government agency RMBS may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, loan level information and prepayment speeds.  The observable inputs used to price non-agency RMBS may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, prepayment speeds, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2 or Level 3.
Asset-backed securities	The fair values of ABS were determined based on observable inputs that may include the spread above the risk-free yield curve, reported trades, broker-dealer quotes, bids, security cash flows and structures, type of collateral, prepayment speeds, delinquencies, loss severities and default rates.  The fair value measurements were classified as Level 2 or Level 3.
Short-term investments	Short-term investments were carried at fair value based on observable inputs or carried at amortized cost, which approximates fair value.  The fair value measurements were classified as Level 1 or Level 2.
Derivative instruments	Our derivative instruments may include interest rate options, commodity options and other derivative instruments.  See Note 4 for additional disclosure on our derivative instruments.  Our interest rate and commodity options were exchange traded and the fair values were based on quoted prices in active markets for identical assets.  The fair values were classified as Level 1.  The fair value of our other derivative instrument was determined by management primarily using unobservable inputs through the application of our own assumptions and internal valuation pricing models.  The fair value was classified as Level 3.

The fair value measurements of our non-agency RMBS and sub-prime ABS classified as Level 3 used significant unobservable inputs that include prepayment rates, probability of default, and loss severity in the event of default.  These measurements were based upon unadjusted third party pricing sources. The fair value measurement of our other derivative instrument classified as Level 3 used significant unobservable inputs through the application of our own assumptions and internal valuation pricing models.  Unobservable inputs used in the internal valuation pricing model included the unpaid contract premiums, probability of losses triggered under the covered perils for first and second events, the remaining time to the end of the annual contract period and the seasonality of risks.  Significant increases or decreases in any of these inputs in isolation may result in a significantly lower or higher fair value measurement.

Level 3 Financial Assets and Liabilities

The following tables reconcile the beginning and ending balance for our Level 3 financial assets and liabilities measured at fair value on a recurring basis for the three months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, April 1	$	5,564		$	1,723		$	-	$	7,287
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(641	)		-			-		(641	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		285			(157	)		-		128
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		-			-			-		-
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

	Three Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, April 1	$	3,305		$	909		$	1,257		$	5,471
Purchases		-			-			-			-
Issuances		-			-			-			-
Settlements		-			-			2,427			2,427
Sales, maturities and paydowns		(89	)		-			-			(89	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(4,474	)		(4,474	)
Total net unrealized gains (losses) included in comprehensive income (loss)		(407	)		525			-			118
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(4,474	)	$	(4,474	)

The following tables reconcile the beginning and ending balance for our Level 3 financial assets and liabilities measured at fair value on a recurring basis for the six months ended June 30, 2012 and 2011 ($ in thousands):

	Six Months Ended June 30, 2012
	Residential mortgage-backed securities			Asset-backed securities			Derivatives		Total
Beginning balance, January 1	$	8,146		$	1,867		$	-	$	10,013
Purchases		-			-			-		-
Issuances		-			-			-		-
Settlements		-			-			-		-
Sales, maturities and paydowns		(734	)		-			-		(734	)
Total net realized gains included in earnings		-			-			-		-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			-		-
Total net unrealized gains (losses) included in comprehensive income (loss)		50			(301	)		-		(251	)
Transfers into Level 3		2,253			-			-		2,253
Transfers out of Level 3		(2,254	)		-			-		(2,254	)
Ending balance, June 30	$	7,461		$	1,566		$	-	$	9,027
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	-	$	-

	Six Months Ended June 30, 2011
	Residential mortgage-backed securities			Asset-backed securities			Derivatives			Total
Beginning balance, January 1	$	2,449		$	1,069		$	(4,871	)	$	(1,353	)
Purchases		-			-			4,829			4,829
Issuances		-			-			-			-
Settlements		-			-			-			-
Sales, maturities and paydowns		(165	)		-			-			(165	)
Total net realized gains included in earnings		-			-			-			-
Total increase (decrease) in fair value of the derivative instrument included in earnings		-			-			(748	)		(748	)
Total net unrealized gains (losses) included in comprehensive income (loss)		525			365			-			890
Transfers into Level 3		-			-			-			-
Transfers out of Level 3		-			(1,434	)		-			(1,434	)
Ending balance, June 30	$	2,809		$	-		$	(790	)	$	2,019
Total increase (decrease) in fair value of the financial assets and liabilities included in earnings for the period	$	-		$	-		$	(748	)	$	(748	)

Transfers of assets and liabilities into or out of Level 3 are recorded at their fair values as of the end of each reporting period, consistent with the date of the determination of fair value.  The transfers into and out of  Level 3 were due to the sufficiency of evidence available to corroborate significant observable inputs with market observable information.  There were no transfers between Levels 1 and 2 during the three and six months ended June 30, 2012 and 2011.

Other Financial Assets and Liabilities Not Carried at Fair Value

Accounting guidance requires disclosures of the fair value of other financial assets and liabilities, however insurance contracts are excluded.

The Series B 7.5% Notes due June 1, 2017 (the "debt obligations") on our consolidated balance sheets were recorded at cost with a carrying value of $250.0 million at June 30, 2012 and December 31, 2011, and had a fair value of $273.2 million and $269.0 million at June 30, 2012 and December 31, 2011, respectively.  The fair value measurements were based on observable inputs and therefore would be considered to be Level 2.

Our other financial assets and liabilities not referred to above were carried at cost or amortized cost, which generally approximates fair value, June 30, 2012 and December 31, 2011.  The fair value measurements were based on observable inputs and therefore would be considered to be Level 1 or Level 2.

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Investments (Details) (USD $)	3 Months Ended			6 Months Ended
	Jun. 30, 2012		Jun. 30, 2011	Jun. 30, 2012		Jun. 30, 2011	Dec. 31, 2011
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	$ 151,449,000			$ 151,449,000			$ 179,216,000
Twelve months or more	87,087,000			87,087,000			74,104,000
Total unrealized losses	238,536,000			238,536,000			253,320,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	1,521,000			1,521,000			4,166,000
Twelve months or more	13,550,000			13,550,000			16,151,000
Total unrealized losses	15,071,000			15,071,000			20,317,000
Fixed Maturity Trading Securities, Fair Value [Abstract]
Fair Value	113,847,000			113,847,000			125,126,000
Trading Securities [Abstract]
Trading securities, net realized gain (loss)			(100,000)			(1,300,000)
Proceeds from sale of fixed maturity trading securities				0		20,413,000
Acquisition of fixed maturity trading securities				0		0
Schedule Of Short Term Investments [Line Items]
Short-term investment fair value	167,778,000			167,778,000			588,834,000
Short-term Investments [Abstract]
Short-term investments trading, net realized gain (loss)	0		(100,000)	(100,000)		100,000
Acquisition of non-USD short-term investments				106,100,000		132,400,000
Proceeds from maturities of non-USD short-term investments				169,600,000		30,600,000
Proceeds from sales of non-USD short-term investments				20,600,000		0
Other-Than-Temporary Impairments [Abstract]
Other-than-temporary impairment loss on corporate bonds	0		0	0		0
Other than temporary impairment loss on government bonds	0		0	0		0
Other than temporary impairment loss on municipal bonds	0		0	0		0
Other-than-temporary impairment loss on commercial mortgage-backed securities	0		0	100,000		0
Largest unrealized loss on single commercial mortgage-backed securities				700,000
Amortized cost of single commercial mortgage-backed security with largest unrealized loss	4,800,000			4,800,000
Other-than-temporary impairment loss on non-agency residential mortgage-backed securities	1,100,000		1,500,000	2,100,000		2,400,000
Largest unrealized loss on single non-agency residential mortgage-backed securities				2,000,000
Amortized cost of single non-agency residential mortgage-backed security with largest unrealized loss	2,400,000			2,400,000
Other-than-temporary impairment loss on sub-prime asset-backed securities	0		200,000	0		800,000
Largest unrealized loss on single sub-prime asset-backed securities				2,200,000
Amortized cost of single sub-prime asset-backed security with largest unrealized loss	4,400,000			4,400,000
Other than Temporary Impairment, Credit Losses Recognized in Earnings [Roll Forward]
Beginning balance	60,444,000		48,138,000	61,841,000		48,845,000
Credit losses on securities not previously impaired	0		20,000	0		20,000
Additional credit losses on securities previously impaired	1,113,000		1,646,000	2,183,000		3,153,000
Reduction for paydowns and securities sold	(3,464,000)		(1,786,000)	(5,721,000)		(3,901,000)
Reduction for increases in cash flows expected to be collected	(219,000)		(146,000)	(429,000)		(245,000)
Ending balance	57,874,000		47,872,000	57,874,000		47,872,000
Cumulative Credit Losses [Abstract]
Cumulative credit losses recorded on commercial mortgage-backed securities	4,100,000			4,100,000
Number of commercial mortgage-backed securities comprising cumulative credit losses	4			4
Percentage of mortgage pools backing CMBS that were past due (in hundredths)	6.40%			6.40%
Number of days without payment for mortgage to be considered past due	90 days			90 days
Percentage of CMBS mortgage pools included in cumulative losses (in hundredths)	0.90%			0.90%
Percentage of remaining credit support allocated for CMBS mortgage pools with incurred losses (in hundredths)	20.30%			20.30%
Cumulative credit losses recorded on non-agency residential mortgage-backed securities and sub-prime asset-backed securities	53,800,000			53,800,000
Number of non-agency RMBS and sub-prime ABS securities comprising cumulative credit losses	28			28
Percentage of mortgage pools backing non-agency RMBS and sub-prime ABS securities that were past due (in hundredths)	16.60%			16.60%
Percentage of non-agency RMBS and sub-prime ABS mortgage pools included in cumulative losses (in hundredths)	5.50%			5.50%
Percentage of remaining credit support for non-agency RMBS and sub-prime ABS mortgage pools which incurred losses (in hundredths)	6.80%			6.80%
Investment Income, Net [Abstract]
Investment Income	27,172,000		35,047,000	56,935,000		68,615,000
Investment expenses	(1,017,000)		(1,082,000)	(2,228,000)		(2,272,000)
Net investment income	26,155,000		33,965,000	54,707,000		66,343,000
Available-for-sale Securities, Gross Realized Gain (Loss) [Abstract]
Gross realized gains on the sale of investments	25,263,000		477,000	47,941,000		4,421,000
Gross realized losses on the sale of investments	0		(6,894,000)	(1,000)		(6,897,000)
Net realized gains (losses) on the sale of investments	25,263,000		(6,417,000)	47,940,000		(2,476,000)
Mark-to-market adjustments on trading securities	(285,000)		1,728,000	(623,000)		(1,806,000)
Net realized gains (losses) on investments	24,978,000		(4,689,000)	47,317,000		(4,282,000)
Amortized Cost: [Abstract]
Due in one year or less	93,049,000			93,049,000
Due from one to five years	430,712,000			430,712,000
Due from five to ten years	570,958,000			570,958,000
Due in ten or more years	653,038,000			653,038,000
Mortgage-backed and asset-backed securities	494,359,000			494,359,000
Total	2,242,116,000			2,242,116,000
Fair Value: [Abstract]
Due in one year or less	93,926,000			93,926,000
Due from one to five years	456,377,000			456,377,000
Due from five to ten years	626,049,000			626,049,000
Due in ten or more years	750,204,000			750,204,000
Mortgage-backed and asset-backed securities	497,278,000			497,278,000
Total	2,423,834,000			2,423,834,000
Fixed Maturity Securities [Member]
Investment Income, Net [Abstract]
Investment Income	24,583,000		32,561,000	51,870,000		64,412,000
Short-Term Investment And Cash And Cash Equivalents [Member]
Investment Income, Net [Abstract]
Investment Income	1,989,000		2,091,000	3,811,000		3,590,000
Funds Held By Ceding Companies [Member]
Investment Income, Net [Abstract]
Investment Income	600,000		395,000	1,254,000		613,000
U.S. Government [Member]
Schedule Of Short Term Investments [Line Items]
Short-term investment fair value	62,352,000			62,352,000			322,320,000
U.S. Government agencies [Member]
Schedule Of Short Term Investments [Line Items]
Short-term investment fair value	0			0			85,389,000
Non-U.S. governments [Member]
Schedule Of Short Term Investments [Line Items]
Short-term investment fair value	105,426,000			105,426,000			181,125,000
Non-U.S. governments [Member]
Fixed Maturity Trading Securities, Fair Value [Abstract]
Fair Value	113,847,000			113,847,000			125,126,000
U.S. Government [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	4,667,000			4,667,000			4,702,000
Gross Unrealized Gains	344,000			344,000			381,000
Gross Unrealized Losses	0			0			0
Fair Value	5,011,000			5,011,000			5,083,000
Non-credit portion of OTTI	0	[1]		0	[1]		0	[1]
U.S. Government agencies [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	10,003,000			10,003,000			100,000,000
Gross Unrealized Gains	161,000			161,000			259,000
Gross Unrealized Losses	0			0			0
Fair Value	10,164,000			10,164,000			100,259,000
Non-credit portion of OTTI	0	[1]		0	[1]		0	[1]
Municipal bonds [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	1,204,826,000			1,204,826,000			1,510,658,000
Gross Unrealized Gains	148,029,000			148,029,000			150,280,000
Gross Unrealized Losses	18,000			18,000			178,000
Fair Value	1,352,837,000			1,352,837,000			1,660,760,000
Non-credit portion of OTTI	0	[1]		0	[1]		0	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	5,801,000			5,801,000			4,751,000
Twelve months or more	3,014,000			3,014,000			3,002,000
Total unrealized losses	8,815,000			8,815,000			7,753,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	1,000			1,000			131,000
Twelve months or more	17,000			17,000			47,000
Total unrealized losses	18,000			18,000			178,000
Non-U.S. governments [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	92,948,000			92,948,000			69,992,000
Gross Unrealized Gains	1,532,000			1,532,000			1,929,000
Gross Unrealized Losses	185,000			185,000			655,000
Fair Value	94,295,000			94,295,000			71,266,000
Non-credit portion of OTTI	0	[1]		0	[1]		0	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	0			0			9,988,000
Twelve months or more	4,814,000			4,814,000			4,373,000
Total unrealized losses	4,814,000			4,814,000			14,361,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	0			0			29,000
Twelve months or more	185,000			185,000			626,000
Total unrealized losses	185,000			185,000			655,000
Corporate bonds [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	330,863,000			330,863,000			329,218,000
Gross Unrealized Gains	20,255,000			20,255,000			21,093,000
Gross Unrealized Losses	716,000			716,000			763,000
Fair Value	350,402,000			350,402,000			349,548,000
Non-credit portion of OTTI	0	[1]		0	[1]		0	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	37,419,000			37,419,000			12,526,000
Twelve months or more	0			0			0
Total unrealized losses	37,419,000			37,419,000			12,526,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	716,000			716,000			763,000
Twelve months or more	0			0			0
Total unrealized losses	716,000			716,000			763,000
Commercial mortgage-backed securities [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	188,789,000			188,789,000			195,309,000
Gross Unrealized Gains	13,941,000			13,941,000			11,884,000
Gross Unrealized Losses	1,374,000			1,374,000			2,584,000
Fair Value	201,356,000			201,356,000			204,609,000
Non-credit portion of OTTI	171,000	[1]		171,000	[1]		196,000	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	11,398,000			11,398,000			19,797,000
Twelve months or more	16,529,000			16,529,000			6,171,000
Total unrealized losses	27,927,000			27,927,000			25,968,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	175,000			175,000			1,047,000
Twelve months or more	1,199,000			1,199,000			1,537,000
Total unrealized losses	1,374,000			1,374,000			2,584,000
Residential mortgage-backed securities [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	283,247,000			283,247,000			261,187,000
Gross Unrealized Gains	2,355,000			2,355,000			2,866,000
Gross Unrealized Losses	9,320,000			9,320,000			12,426,000
Fair Value	276,282,000			276,282,000			251,627,000
Non-credit portion of OTTI	6,068,000	[1]		6,068,000	[1]		8,397,000	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	96,128,000			96,128,000			131,574,000
Twelve months or more	46,116,000			46,116,000			43,704,000
Total unrealized losses	142,244,000			142,244,000			175,278,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	371,000			371,000			2,112,000
Twelve months or more	8,949,000			8,949,000			10,314,000
Total unrealized losses	9,320,000			9,320,000			12,426,000
Asset-backed Securities [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	22,323,000			22,323,000			23,644,000
Gross Unrealized Gains	775,000			775,000			489,000
Gross Unrealized Losses	3,458,000			3,458,000			3,711,000
Fair Value	19,640,000			19,640,000			20,422,000
Non-credit portion of OTTI	3,096,000	[1]		3,096,000	[1]		2,821,000	[1]
Continuous Unrealized Loss Position, Fair Value [Abstract]
Less than twelve months	703,000			703,000			580,000
Twelve months or more	16,614,000			16,614,000			16,854,000
Total unrealized losses	17,317,000			17,317,000			17,434,000
Continuous Unrealized Loss Position, Unrealized Loss [Abstract]
Less than twelve months	258,000			258,000			84,000
Twelve months or more	3,200,000			3,200,000			3,627,000
Total unrealized losses	3,458,000			3,458,000			3,711,000
Total fixed maturity available-for-sale securities [Member]
Amortized cost, gross unrealized gains, losses, fair value and OTTI of AFS securities [Abstract]
Amortized Cost	2,137,666,000			2,137,666,000			2,494,710,000
Gross Unrealized Gains	187,392,000			187,392,000			189,181,000
Gross Unrealized Losses	15,071,000			15,071,000			20,317,000
Fair Value	2,309,987,000			2,309,987,000			2,663,574,000
Non-credit portion of OTTI	$ 9,335,000	[1]		$ 9,335,000	[1]		$ 11,414,000	[1]

[1] The non-credit portion of other than temporary impairments ("OTTI") represents the amount of unrealized losses on impaired securities that were not realized in earnings as of the reporting date. These unrealized losses are included in gross unrealized losses as of June 30, 2012 and December 31, 2011.

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Investments (Tables)

6 Months Ended

Jun. 30, 2012

Investments [Abstract]

Fixed Maturity Available-for-sale Securities

The following table sets forth our fixed maturity available-for-sale securities as of June 30, 2012 and December 31, 2011 ($ in thousands):

			Included in Accumulated Other Comprehensive Income
	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Fair Value		Non-credit portion of OTTI(1)
June 30, 2012:
U.S. Government	$	4,667	$	344	$	-	$	5,011	$	-
U.S. Government agencies		10,003		161		-		10,164		-
Municipal bonds		1,204,826		148,029		18		1,352,837		-
Non-U.S. governments		92,948		1,532		185		94,295		-
Corporate bonds		330,863		20,255		716		350,402		-
Commercial mortgage-backed securities		188,789		13,941		1,374		201,356		171
Residential mortgage-backed securities		283,247		2,355		9,320		276,282		6,068
Asset-backed securities		22,323		775		3,458		19,640		3,096
Total fixed maturity available-for-sale securities	$	2,137,666	$	187,392	$	15,071	$	2,309,987	$	9,335
December 31, 2011:
U.S. Government	$	4,702	$	381	$	-	$	5,083	$	-
U.S. Government agencies		100,000		259		-		100,259		-
Municipal bonds		1,510,658		150,280		178		1,660,760		-
Non-U.S. governments		69,992		1,929		655		71,266		-
Corporate bonds		329,218		21,093		763		349,548		-
Commercial mortgage-backed securities		195,309		11,884		2,584		204,609		196
Residential mortgage-backed securities		261,187		2,866		12,426		251,627		8,397
Asset-backed securities		23,644		489		3,711		20,422		2,821
Total fixed maturity available-for-sale securities	$	2,494,710	$	189,181	$	20,317	$	2,663,574	$	11,414

(1) The non-credit portion of other than temporary impairments ("OTTI") represents the amount of unrealized losses on impaired securities that were not realized in earnings as of the reporting date.  These unrealized losses are included in gross unrealized losses as of June 30, 2012 and December 31, 2011.

Fair Value of Fixed Maturity Trading Securities

The following table sets forth the fair value of our fixed maturity trading securities as of June 30, 2012 and December 31, 2011($ in thousands):

	June 30, 2012		December 31, 2011
Non-U.S. dollar denominated securities:
Non-U.S. governments	$	113,847	$	125,126
Total fixed maturity trading securities	$	113,847	$	125,126

Fair Value of Short-term Investments

The following table sets forth the fair value of our short-term investments as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012		December 31, 2011
Available-for-sale:
U.S. Government	$	62,352	$	322,320
U.S. Government agencies		-		85,389
Trading:
Non-U.S. governments		105,426		181,125
Total short-term investments	$	167,778	$	588,834

Summary of Cumulative Credit Losses Recognized on Fixed Maturity Available-for-sale Securities

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the three months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, April 1	$	60,444		$	48,138
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		1,113			1,646
Reduction for paydowns and securities sold		(3,464	)		(1,786	)
Reduction for increases in cash flows expected to be collected		(219	)		(146	)
Ending balance, June 30	$	57,874		$	47,872

The following table sets forth a summary of the cumulative credit losses recognized on our fixed maturity available-for-sale securities for the six months ended June 30, 2012 and 2011 ($ in thousands):

	2012			2011
Beginning balance, January 1	$	61,841		$	48,845
Credit losses on securities not previously impaired		-			20
Additional credit losses on securities previously impaired		2,183			3,153
Reduction for paydowns and securities sold		(5,721	)		(3,901	)
Reduction for increases in cash flows expected to be collected		(429	)		(245	)
Ending balance, June 30	$	57,874		$	47,872

Gross Unrealized Losses on Fixed Maturity Securities Classified as Available-for-sale

The following table sets forth our gross unrealized losses on securities classified as fixed maturity available-for-sale aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position.  The amounts only relate to securities in an unrealized loss position as of June 30, 2012 and December 31, 2011 ($ in thousands):

	June 30, 2012				December 31, 2011
	Fair Value		Unrealized Loss		Fair Value		Unrealized Loss
Less than twelve months:
Municipal bonds	$	5,801	$	1	$	4,751	$	131
Non-U.S. governments		-		-		9,988		29
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		11,398		175		19,797		1,047
Residential mortgage-backed securities		96,128		371		131,574		2,112
Asset-backed securities		703		258		580		84
Total	$	151,449	$	1,521	$	179,216	$	4,166
Twelve months or more:
Municipal bonds	$	3,014	$	17	$	3,002	$	47
Non-U.S. governments		4,814		185		4,373		626
Corporate bonds		-		-		-		-
Commercial mortgage-backed securities		16,529		1,199		6,171		1,537
Residential mortgage-backed securities		46,116		8,949		43,704		10,314
Asset-backed securities		16,614		3,200		16,854		3,627
Total	$	87,087	$	13,550	$	74,104	$	16,151
Total unrealized losses:
Municipal bonds	$	8,815	$	18	$	7,753	$	178
Non-U.S. governments		4,814		185		14,361		655
Corporate bonds		37,419		716		12,526		763
Commercial mortgage-backed securities		27,927		1,374		25,968		2,584
Residential mortgage-backed securities		142,244		9,320		175,278		12,426
Asset-backed securities		17,317		3,458		17,434		3,711
Total	$	238,536	$	15,071	$	253,320	$	20,317

Net Investment Income

The following table sets forth our net investment income for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Fixed maturity securities	$	24,583		$	32,561		$	51,870		$	64,412
Short-term investments and cash and cash equivalents		1,989			2,091			3,811			3,590
Funds held		600			395			1,254			613
Subtotal		27,172			35,047			56,935			68,615
Investment expenses		(1,017	)		(1,082	)		(2,228	)		(2,272	)
Net investment income	$	26,155		$	33,965		$	54,707		$	66,343

Net Realized Gains (Losses) on Investments

The following table sets forth our net realized gains (losses) on investments for the three and six months ended June 30, 2012 and 2011 ($ in thousands):

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2012			2011			2012			2011
Gross realized gains on the sale of investments	$	25,263		$	477		$	47,941		$	4,421
Gross realized losses on the sale of investments		-			(6,894	)		(1	)		(6,897	)
Net realized gains (losses) on the sale of investments		25,263			(6,417	)		47,940			(2,476	)
Mark-to-market adjustments on trading securities		(285	)		1,728			(623	)		(1,806	)
Net realized gains (losses) on investments	$	24,978		$	(4,689	)	$	47,317		$	(4,282	)

Contractual Maturities of Fixed Maturity Available-for-sale Securities and Trading Securities

The actual maturities of our fixed maturity available-for-sale and trading securities could differ from stated maturities due to call or prepayment provisions.  The following table sets forth the amortized cost and fair value of our fixed maturity available-for-sale and trading securities by stated maturity as of June 30, 2012 ($ in thousands):

	Amortized Cost		Fair Value
Due in one year or less	$	93,049	$	93,926
Due from one to five years		430,712		456,377
Due from five to ten years		570,958		626,049
Due in ten or more years		653,038		750,204
Mortgage-backed and asset-backed securities		494,359		497,278
Total	$	2,242,116	$	2,423,834