10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

(Mark One)

ý Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended March 31, 2018 or

¨ 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 0-16533

ProAssurance Corporation

(Exact Name of Registrant as Specified in Its Charter)

Delaware	63-1261433
(State or Other Jurisdiction of Incorporation or Organization)	(IRS Employer Identification No.)
100 Brookwood Place, Birmingham, AL	35209
(Address of Principal Executive Offices)	(Zip Code)
(205) 877-4400
(Registrant’s Telephone Number, Including Area Code)	(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  ý    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  ý    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, smaller reporting company, or an emerging growth company. See the definitions of "large accelerated filer," "accelerated filer," "smaller reporting company," and "emerging growth company" in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	ý		Accelerated filer	¨
Non-accelerated filer	¨	(Do not check if a smaller reporting company)	Smaller reporting company	¨
Emerging growth company	¨

If an emerging growth company, indicate by check mark if the registrant has elected not to use the extended transition period for complying with any new or revised financial accounting standards provided pursuant to Section 13(a) of the Exchange Act. ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).    Yes  ¨    No  ý

As of April 30, 2018, there were 53,593,712 shares of the registrant’s common stock outstanding.

Glossary of Terms and Acronyms

When the following terms and acronyms appear in the text of this report, they have the meanings indicated below.

Term	Meaning
AOCI	Accumulated other comprehensive income (loss)
ASU	Accounting Standards Update
BEAT	Base erosion anti-abuse tax
Board	Board of Directors of ProAssurance Corporation
BOLI	Business owned life insurance
Council of Lloyd's	The governing body for Lloyd's of London
DPAC	Deferred policy acquisition costs
Eastern Re	Eastern Re, LTD, S.P.C.
EBUB	Earned but unbilled premium
FAL	Funds at Lloyd's
FASB	Financial Accounting Standards Board
FHLB	Federal Home Loan Bank
FHLMC	Federal Home Loan Mortgage Corporation
FNMA	Federal National Mortgage Association
GAAP	Generally accepted accounting principles in the United States of America
GNMA	Government National Mortgage Association
HCPL	Healthcare professional liability
IBNR	Incurred but not reported
Inova Re	Inova Re, LTD, S.P.C.
IRS	Internal Revenue Service
LIBOR	London Interbank Offered Rate
LLC	Limited liability company
Lloyd's	Lloyd's of London market
LP	Limited partnership
Medical technology liability	Medical technology and life sciences products liability
NAV	Net asset value
NOL	Net operating loss
NRSRO	Nationally recognized statistical rating organization
NYSE	New York Stock Exchange
OCI	Other comprehensive income (loss)
OTTI	Other-than-temporary impairment
PCAOB	Public Company Accounting Oversight Board
Revolving Credit Agreement	ProAssurance's $250 million revolving credit agreement
ROE	Return on equity
SEC	Securities and Exchange Commission
SPA	Special Purpose Arrangement
SPC	Segregated portfolio cell
Specialty P&C	Specialty Property and Casualty
Syndicate 1729	Lloyd's of London Syndicate 1729
Syndicate 6131	Lloyd's of London Syndicate 6131, a Special Purpose Arrangement with Lloyd's of London Syndicate 1729
Syndicate Credit Agreement	Unconditional revolving credit agreement with the Premium Trust Fund of Syndicate 1729
TCJA	Tax Cuts and Jobs Act H.R.1 of 2017

2

Term	Meaning
U.K.	United Kingdom of Great Britain and Northern Ireland
VIE	Variable interest entity

3

Caution Regarding Forward-Looking Statements

Any statements in this Form 10-Q that are not historical facts are specifically identified as forward-looking statements. These statements are based upon our estimates and anticipation of future events and are subject to significant risks, assumptions and uncertainties that could cause actual results to vary materially from the expected results described in the forward-looking statements. Forward-looking statements are identified by words such as, but not limited to, "anticipate," "believe," "estimate," "expect," "hope," "hopeful," "intend," "likely," "may," "optimistic," "possible," "potential," "preliminary," "project," "should," "will" and other analogous expressions. There are numerous factors that could cause our actual results to differ materially from those in the forward-looking statements. Thus, sentences and phrases that we use to convey our view of future events and trends are expressly designated as forward-looking statements as are sections of this Form 10-Q that are identified as giving our outlook on future business.

Forward-looking statements relating to our business include among other things: statements concerning future liquidity and capital requirements, investment valuation and performance, return on equity, financial ratios, net income, premiums, losses and loss reserve, premium rates and retention of current business, competition and market conditions, the expansion of product lines, the development or acquisition of business in new geographical areas, the availability of acceptable reinsurance, actions by regulators and rating agencies, court actions, legislative actions, payment or performance of obligations under indebtedness, payment of dividends and other matters.

These forward-looking statements are subject to significant risks, assumptions and uncertainties, including, among other things, the following factors that could affect the actual outcome of future events:

Ÿ	changes in general economic conditions, including the impact of inflation or deflation and unemployment;
Ÿ	our ability to maintain our dividend payments;
Ÿ	regulatory, legislative and judicial actions or decisions that could affect our business plans or operations;
Ÿ	the enactment or repeal of tort reforms;
Ÿ	formation or dissolution of state-sponsored insurance entities providing coverages now offered by ProAssurance which could remove or add sizable numbers of insureds from or to the private insurance market;
Ÿ	changes in the interest and tax rate environment;
Ÿ	resolution of uncertain tax matters and changes in tax laws, including the impact of the TCJA;
Ÿ	changes in U.S. laws or government regulations regarding financial markets or market activity that may affect the U.S. economy and our business;
Ÿ	changes in the ability of the U.S. government to meet its obligations that may affect the U.S. economy and our business;
Ÿ	performance of financial markets affecting the fair value of our investments or making it difficult to determine the value of our investments;
Ÿ	changes in requirements or accounting policies and practices that may be adopted by our regulatory agencies, the FASB, the SEC, the PCAOB or the NYSE that may affect our business;
Ÿ	changes in laws or government regulations affecting the financial services industry, the property and casualty insurance industry or particular insurance lines underwritten by our subsidiaries;
Ÿ	the effect on our insureds, particularly the insurance needs of our insureds, and our loss costs, of changes in the healthcare delivery system and/or changes in the U.S. political climate that may affect healthcare policy or our business;
Ÿ	consolidation of our insureds into or under larger entities which may be insured by competitors, or may not have a risk profile that meets our underwriting criteria or which may not use external providers for insuring or otherwise managing substantial portions of their liability risk;
Ÿ	uncertainties inherent in the estimate of our loss and loss adjustment expense reserve and reinsurance recoverable;
Ÿ	changes in the availability, cost, quality or collectability of insurance/reinsurance;
Ÿ	the results of litigation, including pre- or post-trial motions, trials and/or appeals we undertake;
Ÿ	effects on our claims costs from mass tort litigation that are different from that anticipated by us;
Ÿ	allegations of bad faith which may arise from our handling of any particular claim, including failure to settle;
Ÿ	loss or consolidation of independent agents, agencies, brokers or brokerage firms;
Ÿ	changes in our organization, compensation and benefit plans;
Ÿ	changes in the business or competitive environment may limit the effectiveness of our business strategy and impact our revenues;

4

Ÿ	our ability to retain and recruit senior management;
Ÿ	the availability, integrity and security of our technology infrastructure or that of our third-party providers of technology infrastructure, including any susceptibility to cyber-attacks which might result in a loss of information or operating capability;
Ÿ	the impact of a catastrophic event, as it relates to both our operations and our insured risks;
Ÿ	the impact of acts of terrorism and acts of war;
Ÿ	the effects of terrorism-related insurance legislation and laws;
Ÿ	guaranty funds and other state assessments;
Ÿ	our ability to achieve continued growth through expansion into new markets or through acquisitions or business combinations;
Ÿ	changes to the ratings assigned by rating agencies to our insurance subsidiaries, individually or as a group;
Ÿ	provisions in our charter documents, Delaware law and state insurance laws may impede attempts to replace or remove management or may impede a takeover;
Ÿ	state insurance restrictions may prohibit assets held by our insurance subsidiaries, including cash and investment securities, from being used for general corporate purposes;
Ÿ	taxing authorities can take exception to our tax positions and cause us to incur significant amounts of legal and accounting costs and, if our defense is not successful, additional tax costs, including interest and penalties; and
Ÿ	expected benefits from completed and proposed acquisitions may not be achieved or may be delayed longer than expected due to business disruption; loss of customers, employees or key agents; increased operating costs or inability to achieve cost savings; and assumption of greater than expected liabilities, among other reasons.
Additional risks, assumptions and uncertainties that could arise from our membership in the Lloyd's market and our participation in Lloyd's Syndicates include, but are not limited to, the following:
Ÿ	members of Lloyd's are subject to levies by the Council of Lloyd's based on a percentage of the member's underwriting capacity, currently a maximum of 3%, but can be increased by Lloyd's;
Ÿ	Syndicate operating results can be affected by decisions made by the Council of Lloyd's which the management of Syndicate 1729 and Syndicate 6131 have little ability to control, such as a decision to not approve the business plan of Syndicate 1729 or Syndicate 6131, or a decision to increase the capital required to continue operations, and by our obligation to pay levies to Lloyd's;
Ÿ	Lloyd's insurance and reinsurance relationships and distribution channels could be disrupted or Lloyd's trading licenses could be revoked making it more difficult for a Lloyd's Syndicate to distribute and market its products;
Ÿ	rating agencies could downgrade their ratings of Lloyd's as a whole; and
Ÿ	Syndicate 1729 and Syndicate 6131 operations are dependent on a small, specialized management team and the loss of their services could adversely affect the Syndicate’s business. The inability to identify, hire and retain other highly qualified personnel in the future, could adversely affect the quality and profitability of Syndicate 1729’s or Syndicate 6131's business.

Our results may differ materially from those we expect and discuss in any forward-looking statements. The principal risk factors that may cause these differences are described in "Item 1A, Risk Factors" in our Form 10-K and other documents we file with the SEC, such as our current reports on Form 8-K and our regular reports on Form 10-Q.

We caution readers not to place undue reliance on any such forward-looking statements, which are based upon conditions existing only as of the date made, and advise readers that these factors could affect our financial performance and could cause actual results for future periods to differ materially from any opinions or statements expressed with respect to future periods in any current statements. Except as required by law or regulations, we do not undertake and specifically decline any obligation to publicly release the result of any revisions that may be made to any forward-looking statements to reflect events or circumstances after the date of such statements or to reflect the occurrence of anticipated or unanticipated events.

5

	TABLE OF CONTENTS
PART I. FINANCIAL INFORMATION
ITEM 1.	FINANCIAL STATEMENTS
	CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) - MARCH 31, 2018 AND DECEMBER 31, 2017	7
	CONDENSED CONSOLIDATED STATEMENTS OF CHANGES IN CAPITAL (UNAUDITED) - THREE MONTHS ENDED MARCH 31, 2018 AND 2017	8
	CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (UNAUDITED) - THREE MONTHS ENDED MARCH 31, 2018 AND 2017	9
	CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (UNAUDITED) - THREE MONTHS ENDED MARCH 31, 2018 AND 2017	10
	NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS (UNAUDITED)	12
	BASIS OF PRESENTATION	12
	FAIR VALUE MEASUREMENT	16
	INVESTMENTS	25
	INCOME TAXES	30
	RESERVE FOR LOSSES AND LOSS ADJUSTMENT EXPENSES	31
	COMMITMENTS AND CONTINGENCIES	33
	DEBT	33
	DERIVATIVES	34
	SHAREHOLDERS' EQUITY	35
	VARIABLE INTEREST ENTITIES	36
	EARNINGS PER SHARE	37
	SEGMENT INFORMATION	38
ITEM 2.	MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS	41
ITEM 3.	QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK	88
ITEM 4.	CONTROLS AND PROCEDURES	91
PART II. OTHER INFORMATION
ITEM 1.	LEGAL PROCEEDINGS	91
ITEM 1A.	RISK FACTORS	91
ITEM 2.	UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS	91
ITEM 6.	EXHIBITS	92
SIGNATURE		93

6

ProAssurance Corporation and Subsidiaries

Condensed Consolidated Balance Sheets (Unaudited)

(In thousands, except share data)

	March 31, 2018			December 31, 2017
Assets
Investments
Fixed maturities, at fair value; cost or amortized cost, $2,169,546 and $2,257,188, respectively	$	2,157,831		$	2,280,242
Equity investments, at fair value; cost, $471,337 and $425,942, respectively	492,159			470,609
Short-term investments	349,119			432,126
Business owned life insurance	62,562			62,113
Investment in unconsolidated subsidiaries	401,030			330,591
Other investments, $33,042 and $52,301 at fair value, respectively, otherwise at cost or amortized cost	35,944			110,847
Total Investments	3,498,645			3,686,528
Cash and cash equivalents	43,247			134,495
Premiums receivable	247,644			238,085
Receivable from reinsurers on paid losses and loss adjustment expenses	12,935			7,317
Receivable from reinsurers on unpaid losses and loss adjustment expenses	329,540			335,585
Prepaid reinsurance premiums	39,899			39,916
Deferred policy acquisition costs	50,765			50,261
Deferred tax asset, net	16,874			9,930
Real estate, net	31,646			31,975
Intangible assets, net	81,408			82,952
Goodwill	210,725			210,725
Other assets	115,596			101,428
Total Assets	$	4,678,924		$	4,929,197
Liabilities and Shareholders' Equity
Liabilities
Policy liabilities and accruals
Reserve for losses and loss adjustment expenses	$	2,056,801		$	2,048,381
Unearned premiums	426,627			398,884
Reinsurance premiums payable	46,933			37,726
Total Policy Liabilities	2,530,361			2,484,991
Other liabilities	207,866			437,600
Debt less debt issuance costs	371,528			411,811
Total Liabilities	3,109,755			3,334,402
Shareholders' Equity
Common shares, par value $0.01 per share, 100,000,000 shares authorized, 62,960,615 and 62,824,523 shares issued, respectively	630			628
Additional paid-in capital	380,250			383,077
Accumulated other comprehensive income (loss), net of deferred tax expense (benefit) of ($1,842) and $5,218, respectively	(8,046		)	14,911
Retained earnings	1,614,344			1,614,186
Treasury shares, at cost, 9,367,545 shares and 9,367,502 shares, respectively	(418,009		)	(418,007		)
Total Shareholders' Equity	1,569,169			1,594,795
Total Liabilities and Shareholders' Equity	$	4,678,924		$	4,929,197

See accompanying notes.

7

ProAssurance Corporation and Subsidiaries

Condensed Consolidated Statements of Changes in Capital (Unaudited)

(In thousands)

	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Treasury Stock			Total
Balance at December 31, 2017	$	628	$	383,077		$	14,911		$	1,614,186		$	(418,007	)	$	1,594,795
Cumulative-effect adjustment- ASU 2016-01 adoption*	—		—			—			8,334			—			8,334
Cumulative-effect adjustment- ASU 2018-02 adoption*	—		—			3,416			(3,416		)	—			—
Common shares issued for compensation and effect of shares reissued to stock purchase plan	—		122			—			—			(2		)	120
Share-based compensation	—		902			—			—			—			902
Net effect of restricted and performance shares issued	2		(3,851		)	—			—			—			(3,849		)
Dividends to shareholders	—		—			—			(16,616		)	—			(16,616		)
Other comprehensive income (loss)	—		—			(26,373		)	—			—			(26,373		)
Net income	—		—			—			11,856			—			11,856
Balance at March 31, 2018	$	630	$	380,250		$	(8,046	)	$	1,614,344		$	(418,009	)	$	1,569,169
	Common Stock		Additional Paid-in Capital			Accumulated Other Comprehensive Income (Loss)			Retained Earnings			Treasury Stock			Total
Balance at December 31, 2016	$	627	$	376,518		$	17,399		$	1,824,088		$	(419,930	)	$	1,798,702
Cumulative-effect adjustment- ASU 2016-09 adoption	—		425			—			(276		)	—			149
Common shares issued for compensation and effect of shares reissued to stock purchase plan	—		938			—			—			2			940
Share-based compensation	—		3,346			—			—			—			3,346
Net effect of restricted and performance shares issued	1		(5,315		)	—			—			—			(5,314		)
Dividends to shareholders	—		—			—			(16,516		)	—			(16,516		)
Other comprehensive income (loss)	—		—			2,924			—			—			2,924
Net income	—		—			—			41,455			—			41,455
Balance at March 31, 2017	$	628	$	375,912		$	20,323		$	1,848,751		$	(419,928	)	$	1,825,686
* See Note 1 for discussion of accounting guidance adopted during the period.

See accompanying notes.

8

ProAssurance Corporation and Subsidiaries

Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited)

(In thousands, except per share data)

	Three Months Ended March 31
	2018			2017
Revenues
Net premiums earned	$	187,159		$	182,903
Net investment income	22,027			23,186
Equity in earnings (loss) of unconsolidated subsidiaries	1,640			1,808
Net realized investment gains (losses):
OTTI losses	—			(419		)
Portion of OTTI losses recognized in other comprehensive income before taxes	—			248
Net impairment losses recognized in earnings	—			(171		)
Other net realized investment gains (losses)	(12,517		)	13,451
Total net realized investment gains (losses)	(12,517		)	13,280
Other income	2,723			1,821
Total revenues	201,032			222,998
Expenses
Net losses and loss adjustment expenses	129,786			119,151
Underwriting, policy acquisition and operating expenses
Operating expense	32,467			34,482
DPAC amortization	24,893			22,626
Segregated portfolio cells dividend expense (income)	1,747			2,375
Interest expense	3,705			4,133
Total expenses	192,598			182,767
Income before income taxes	8,434			40,231
Provision for income taxes
Current expense (benefit)	(1,328		)	(8,278		)
Deferred expense (benefit)	(2,094		)	7,054
Total income tax expense (benefit)	(3,422		)	(1,224		)
Net income	11,856			41,455
Other comprehensive income (loss), after tax, net of reclassification adjustments	(26,373		)	2,924
Comprehensive income (loss)	$	(14,517	)	$	44,379
Earnings per share
Basic	$	0.22		$	0.78
Diluted	$	0.22		$	0.77
Weighted average number of common shares outstanding:
Basic	53,515			53,315
Diluted	53,682			53,535
Cash dividends declared per common share	$	0.31		$	0.31

See accompanying notes.

9

ProAssurance Corporation and Subsidiaries

Condensed Consolidated Statements of Cash Flows (Unaudited)

(In thousands)

	Three Months Ended March 31
	2018			2017
Operating Activities
Net income	$	11,856		$	41,455
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, net of accretion	6,079			7,803
(Increase) decrease in cash surrender value of BOLI	(449		)	(455		)
Net realized investment (gains) losses	12,517			(13,280		)
Share-based compensation	902			3,346
Deferred income taxes	(2,094		)	7,054
Policy acquisition costs, net of amortization (net deferral)	(504		)	(2,376		)
Equity in (earnings) loss of unconsolidated subsidiaries	(1,640		)	(1,808		)
Distributed earnings from unconsolidated subsidiaries	7,018			10,893
Other	752			(167		)
Other changes in assets and liabilities:
Premiums receivable	(9,559		)	(1,238		)
Reinsurance related assets and liabilities	9,651			2,428
Other assets	6,254			(5,027		)
Reserve for losses and loss adjustment expenses	8,420			3,561
Unearned premiums	27,743			24,576
Other liabilities	(3,592		)	(7,393		)
Net cash provided (used) by operating activities	73,354			69,372
Investing Activities
Purchases of:
Fixed maturities, available for sale	(367,872		)	(160,364		)
Fixed maturities, trading	(4,162		)	—
Equity investments	(67,129		)	(35,400		)
Other investments	(7,108		)	(3,930		)
Funding of qualified affordable housing project tax credit partnerships	—			(37		)
Investment in unconsolidated subsidiaries	(21,985		)	(5,613		)
Proceeds from sales or maturities of:
Fixed maturities, available for sale	459,822			171,986
Equity investments	51,085			41,584
Other investments	6,092			6,788
Return of invested capital from unconsolidated subsidiaries	11,783			6,955
Net sales or maturities (purchases) of short-term investments	82,976			160,792
Unsettled security transactions, net change	22,421			6,296
Purchases of capital assets	(1,836		)	(4,535		)
Repayments (advances) under Syndicate Credit Agreement	(17,980		)	1,159
Net cash provided (used) by investing activities	146,107			185,681
Continued on the following page.

10

	Three Months Ended March 31
	2018			2017
Continued from the previous page.
Financing Activities
Borrowings (repayments) under Revolving Credit Agreement	(40,000		)	—
Repayments of Mortgage Loans	(349		)	—
Dividends to shareholders	(266,734		)	(265,664		)
External capital contribution received for segregated portfolio cells	251			114
Other	(3,877		)	(4,932		)
Net cash provided (used) by financing activities	(310,709		)	(270,482		)
Increase (decrease) in cash and cash equivalents	(91,248		)	(15,429		)
Cash and cash equivalents at beginning of period	134,495			117,347
Cash and cash equivalents at end of period	$	43,247		$	101,918
Significant Non-Cash Transactions
Dividends declared and not yet paid	$	16,616		$	16,516

See accompanying notes.

11

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

1. Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of ProAssurance Corporation and its consolidated subsidiaries (ProAssurance, PRA or the Company). The financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation, consisting of normal recurring adjustments, have been included. ProAssurance’s results for the three months endedMarch 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes contained in ProAssurance’s December 31, 2017 report on Form 10-K. In connection with its preparation of the Condensed Consolidated Financial Statements, ProAssurance evaluated events that occurred subsequent to March 31, 2018 for recognition or disclosure in its financial statements and notes to financial statements.

ProAssurance operates in four reportable segments as follows: Specialty P&C, Workers' Compensation, Lloyd's Syndicate and Corporate. For more information on the nature of products and services provided and for financial information by segment, refer to Note 12.

Reclassifications

In the second quarter of 2017, ProAssurance began presenting separately the components of underwriting, policy acquisition and operating expense as operating expense and DPAC amortization on the Condensed Consolidated Statements of Income and Comprehensive Income in order to provide additional details for investors. The Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2017 have been reclassified to conform to the current period presentation. Total underwriting, policy acquisition and operating expense as well as net income for the three months endedMarch 31, 2017 was not affected by the change in presentation.

Certain other insignificant prior period amounts have been reclassified to conform to the current period presentation.

Other Liabilities

Other liabilities consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
SPC dividends payable	$	47,122	$	46,925
Unpaid dividends	16,616		267,292
All other	144,128		123,383
Total other liabilities	$	207,866	$	437,600

SPC dividends payable are the cumulative undistributed earnings contractually payable to the external preferred shareholders of the SPCs operated by Eastern Re and Inova Re, ProAssurance's Cayman Islands reinsurance subsidiaries.

Unpaid dividends represent common stock dividends declared by ProAssurance's Board that had not yet been paid as of March 31, 2018. Unpaid dividends at December 31, 2017 reflected a special dividend declared in the fourth quarter of 2017 that was paid in January 2018.

Accounting Changes Adopted

Restricted Cash (ASU 2016-18)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of restricted cash presented in the statement of cash flows with the objective of reducing diversity in practice. Under the new guidance, entities are required to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts as presented on the statement of cash flows. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

12

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Intra-Entity Transfers of Assets Other than Inventory (ASU 2016-16)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards related to the income tax consequences of intra-entity transfers of assets other than inventory between tax-paying components. A tax-paying component is an individual entity or group of entities that is consolidated for tax purposes. Under the new guidance, entities are required to recognize income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs instead of delaying recognition until the asset has been sold to an outside party. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Classification of Certain Cash Receipts and Cash Payments (ASU 2016-15)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of certain cash receipts and cash payments presented in the statement of cash flows with the objective of reducing diversity in practice. ProAssurance adopted the guidance as of January 1, 2018 and elected to use the cumulative earnings approach for presenting distributions from equity method investees. Adoption of the guidance had no material effect on ProAssurance’s results of operations or financial position; however, ProAssurance reclassified approximately $10.9 million in distributions from unconsolidated subsidiaries from investing activities to operating activities in the Condensed Consolidated Statement of Cash Flows for the three months endedMarch 31, 2017.

Revenue from Contracts with Customers (ASU 2014-09)

Effective for fiscal years beginning after December 15, 2017 the FASB issued guidance related to revenue from contracts with customers. The core principle of the new guidance is that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ProAssurance adopted the guidance as of January 1, 2018 under the modified retrospective method. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The new guidance also specifies that an entity use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and present financial assets and liabilities by measurement category and form of financial asset. Other provisions of the new guidance include: revised disclosure requirements related to the presentation in comprehensive income of changes in the fair value of liabilities; elimination, for public companies, of disclosure requirements relative to the methods and significant assumptions underlying fair values disclosed for financial instruments measured at amortized cost; and simplified impairment assessments for equity investments without readily determinable fair values. ProAssurance adopted the guidance as of January 1, 2018 using a modified retrospective application and recorded a cumulative-effect after-tax adjustment of approximately $8.3 million to beginning retained earnings in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Modification Accounting for Employee Share-Based Payment Awards (ASU 2017-09)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards when there is a change in the terms or conditions of a share-based payment award. The new guidance clarifies that an entity should apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Reclassification of Certain Tax Effects from AOCI (ASU 2018-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted, the FASB issued guidance which permits a reclassification from AOCI to retained earnings for stranded tax effects resulting from the newly enacted federal corporate tax rate from the TCJA. The amount of the reclassification from AOCI to retained earnings will be the difference between the historical corporate tax rate and the newly enacted 21% corporate tax rate on deferred tax items originally established through OCI and not net income. The guidance allows entities to adopt in any interim or annual period for which financial statements have not yet been issued and apply the guidance either (1) in the period of adoption or (2) retrospectively to each period in which the effect of the change in the tax rate is recognized. ProAssurance adopted this guidance as of January 1, 2018 and elected to apply this guidance in the period of adoption using the specific identification method. Using a modified retrospective application, ProAssurance recorded a cumulative-effect

13

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

adjustment which increased beginning AOCI by approximately $3.4 million and decreased beginning retained earnings by the same amount in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of this guidance had no material effect on ProAssurance's financial position, results of operations or cash flows.

Accounting Changes Not Yet Adopted

Technical Corrections and Improvements to Financial Instruments - Overall (ASU 2018-03)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years beginning after June 15, 2018, the FASB amended the new standard on recognizing and measuring financial assets and financial liabilities to clarify certain aspects of the guidance. Under the amended guidance, an entity that uses the measurement alternative for equity investments without readily determinable fair values can change its measurement approach to a fair value method through an irrevocable election that would apply to that security and all identical or similar investments of the same issuer. Also, entities are required to use the prospective transition approach only for equity investments they elect to measure using the new measurement alternative. Additionally, the guidance clarifies how to apply the measurement alternative and presentation requirements for financial liabilities measured under the fair value option. ProAssurance plans to adopt the guidance beginning July 1, 2018. As of March 31, 2018, ProAssurance does not have any equity investments without readily determinable fair values or financial liabilities measured under the fair value option; therefore, adoption of the guidance is not expected to have a material effect on ProAssurance’s financial position, results of operations or cash flows.

Leases (ASU 2016-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that requires a lessee to recognize for all leases (with the exception of short-term leases) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. ProAssurance plans to adopt the guidance beginning January 1, 2019 and is currently in the process of evaluating all of its leases. As the majority of ProAssurance's leases are real estate operating leases and are not considered to be material, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Premium Amortization on Purchased Callable Debt Securities (ASU 2017-08)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that will require the premium for certain callable debt securities to be amortized over a shorter period than is currently required. Currently amortization is permitted over the contractual life of the instrument and the guidance shortens the amortization to the earliest call date. The purpose of the guidance is to more closely align the amortization period of premiums to expectations incorporated in market pricing on the underlying securities. ProAssurance plans to adopt the guidance beginning January 1, 2019. As ProAssurance amortizes premium on callable debt securities to the earliest call date, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Derivatives and Hedging (ASU 2017-12)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance to improve financial reporting of hedging relationships to better portray the entity's risk management activities in the consolidated financial statements. The new guidance eliminates the requirement to separately measure and report hedge ineffectiveness and requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. ProAssurance plans to adopt the guidance beginning January 1, 2019. ProAssurance's derivative instrument at March 31, 2018 is not designated as a hedging instrument; therefore, adoption is not expected to have a material effect on ProAssurance's results of operations, financial position or cash flows.

Improvements to Financial Instruments - Credit Losses (ASU 2016-13)

Effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that replaces the incurred loss impairment methodology, which delays recognition of credit losses until a probable loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. Under the new guidance, credit losses are required to be recorded through an allowance for credit losses account and the income statement reflects the measurement for newly recognized financial assets, as well as increases or decreases of expected credit losses that have taken place during the period. ProAssurance is in the process of evaluating the effect the new guidance would have on its results of operations and financial position and plans to adopt the guidance beginning January 1, 2020.

14

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Simplifying the Test for Goodwill Impairment (ASU 2017-04)

Effective for the fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that simplifies the requirements to test goodwill for impairment for business entities that have goodwill reported in their financial statements. The guidance eliminates the second step of the impairment test which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount. In addition, the guidance also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. ProAssurance plans to adopt the guidance beginning January 1, 2020. Adoption is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

15

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

2. Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three level hierarchy has been established for valuing assets and liabilities based on how transparent (observable) the inputs are that are used to determine fair value, with the inputs considered most observable categorized as Level 1 and those that are the least observable categorized as Level 3. Hierarchy levels are defined as follows:

Level 1: quoted (unadjusted) market prices in active markets for identical assets and liabilities. For ProAssurance, Level 1 inputs are generally quotes for debt or equity securities actively traded in exchange or over-the-counter markets.

Level 2: market data obtained from sources independent of the reporting entity (observable inputs). For ProAssurance, Level 2 inputs generally include quoted prices in markets that are not active, quoted prices for similar assets or liabilities, and results from pricing models that use observable inputs such as interest rates and yield curves that are generally available at commonly quoted intervals.

Level 3: the reporting entity's own assumptions about market participant assumptions based on the best information available in the circumstances (non-observable inputs). For ProAssurance, Level 3 inputs are used in situations where little or no Level 1 or 2 inputs are available or are inappropriate given the particular circumstances. Level 3 inputs include results from pricing models for which some or all of the inputs are not observable, discounted cash flow methodologies, single non-binding broker quotes and adjustments to externally quoted prices that are based on management judgment or estimation.

Fair values of assets measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are shown in the following tables. Where applicable, the tables also indicate the fair value hierarchy of the valuation techniques utilized to determine those fair values. For some assets, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. When this is the case, the asset is categorized based on the level of the most significant input to the fair value measurement. Assessments of the significance of a particular input to the fair value measurement require judgment and consideration of factors specific to the assets being valued.

16

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

	March 31, 2018
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	129,751	$	—	$	129,751
U.S. Government-sponsored enterprise obligations	—		29,959		—		29,959
State and municipal bonds	—		329,995		—		329,995
Corporate debt, multiple observable inputs	2,334		1,230,832		—		1,233,166
Corporate debt, limited observable inputs	—		—		15,097		15,097
Residential mortgage-backed securities	—		215,420		—		215,420
Agency commercial mortgage-backed securities	—		14,887		—		14,887
Other commercial mortgage-backed securities	—		29,195		—		29,195
Other asset-backed securities	—		138,890		17,323		156,213
Fixed maturities, trading
Corporate debt	—		4,148		—		4,148
Equity investments
Financial	74,556		—		—		74,556
Utilities/Energy	46,637		—		—		46,637
Consumer oriented	54,789		—		—		54,789
Industrial	48,859		—		—		48,859
Bond funds	153,256		—		—		153,256
All other	93,847		—		—		93,847
Short-term investments	288,019		61,100		—		349,119
Other investments	604		32,073		365		33,042
Other assets	—		2,306		—		2,306
Total assets categorized within the fair value hierarchy	$	762,901	$	2,218,556	$	32,785	3,014,242
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Equity investments							20,215
Investment in unconsolidated subsidiaries							277,094
Total assets at fair value							$	3,311,551

17

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

	December 31, 2017
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	133,627	$	—	$	133,627
U.S. Government-sponsored enterprise obligations	—		20,956		—		20,956
State and municipal bonds	—		632,243		—		632,243
Corporate debt, multiple observable inputs	2,371		1,151,084		—		1,153,455
Corporate debt, limited observable inputs	—		—		13,703		13,703
Residential mortgage-backed securities	—		196,789		1,055		197,844
Agency commercial mortgage-backed securities	—		10,742		—		10,742
Other commercial mortgage-backed securities	—		15,961		—		15,961
Other asset-backed securities	—		97,780		3,931		101,711
Equity investments
Financial	76,051		—		—		76,051
Utilities/Energy	54,388		—		—		54,388
Consumer oriented	54,529		—		—		54,529
Industrial	53,936		—		—		53,936
Bond funds	156,563		—		—		156,563
All other	75,142		—		—		75,142
Short-term investments	404,204		27,922		—		432,126
Other investments	607		31,155		409		32,171
Other assets	—		1,731		—		1,731
Total assets categorized within the fair value hierarchy	$	877,791	$	2,319,990	$	19,098	3,216,879
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Investment in unconsolidated subsidiaries							210,759
Other investments							20,130
Total assets at fair value							$	3,447,768

The fair values for securities included in the Level 2 category, with the few exceptions described below, were developed by one of several third party, nationally recognized pricing services, including services that price only certain types of securities. Each service uses complex methodologies to determine values for securities and subject the values they develop to quality control reviews. Management selected a primary source for each type of security in the portfolio and reviewed the values provided for reasonableness by comparing data to alternate pricing services and to available market and trade data. Values that appeared inconsistent were further reviewed for appropriateness. Any value that did not appear reasonable was discussed with the service that provided the value and adjusted, if necessary. There were no material changes to the values supplied by the pricing services during the three months endedMarch 31, 2018 and 2017.

Level 2 Valuations

Below is a summary description of the valuation methodologies primarily used by the pricing services for securities in the Level 2 category, by security type:

U.S. Treasury obligations were valued based on quoted prices for identical assets, or, in markets that are not active, quotes for similar assets, taking into consideration adjustments for variations in contractual cash flows and yields to maturity.

U.S. Government-sponsored enterprise obligations were valued using pricing models that consider current and historical market data, normal trading conventions, credit ratings, and the particular structure and characteristics of the security being valued, such as yield to maturity, redemption options, and contractual cash flows. Adjustments to model inputs or model results

18

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

were included in the valuation process when necessary to reflect recent regulatory, government or corporate actions or significant economic, industry or geographic events affecting the security’s fair value.

State and municipal bonds were valued using a series of matrices that considered credit ratings, the structure of the security, the sector in which the security falls, yields, and contractual cash flows. Valuations were further adjusted, when necessary, to reflect the expected effect on fair value of recent significant economic or geographic events or ratings changes.

Corporate debt, multiple observable inputs consisted primarily of corporate bonds, but also included a small number of bank loans. The methodology used to value Level 2 corporate bonds was the same as the methodology previously described for U.S. Government-sponsored enterprise obligations. Bank loans were valued based on an average of broker quotes for the loans in question, if available. If quotes were not available, the loans were valued based on quoted prices for comparable loans or, if the loan was newly issued, by comparison to similar seasoned issues. Broker quotes were compared to actual trade prices to permit assessment of the reliability of the quotes; unreliable quotes were not considered in quoted averages.

Residential and commercial mortgage-backed securities were valued using a pricing matrix which considers the issuer type, coupon rate and longest cash flows outstanding. The matrix used was based on the most recently available market information. Agency and non-agency collateralized mortgage obligations were both valued using models that consider the structure of the security, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data.

Other asset-backed securities were valued using models that consider the structure of the security, monthly payment information, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data. Spreads and prepayment speeds consider collateral type.

Short-term investments were securities maturing within one year, carried at cost which approximated the fair value of the security due to the short term to maturity.

Other investments consisted primarily of convertible bonds valued using a pricing model that incorporated selected dealer quotes as well as current market data regarding equity prices and risk free rates. If dealer quotes were unavailable for the security being valued, quotes for securities with similar terms and credit status were used in the pricing model. Dealer quotes selected for use were those considered most accurate based on parameters such as underwriter status and historical reliability.

Other assets consisted of an interest rate cap derivative instrument valued using a model which considers the volatilities from other instruments with similar maturities, strike prices, durations and forward yield curves.

Level 3 Valuations

Below is a summary description of the valuation processes and methodologies used as well as quantitative information regarding securities in the Level 3 category.

Level 3 Valuation Processes

• Level 3 securities are priced by the Chief Investment Officer.

• Level 3 valuations are computed quarterly. Prices are evaluated quarterly against prior period prices and the expected change in prices.

• ProAssurance's Level 3 securities are primarily NRSRO rated debt instruments for which comparable market inputs are commonly available for evaluating the securities in question. Valuation of these debt instruments is not overly sensitive to changes in the unobservable inputs used.

19

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Level 3 Valuation Methodologies

Corporate debt, limited observable inputs consisted of corporate bonds valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 87% of the securities were rated and the average rating was BBB. At December 31, 2017, 84% of the securities were rated and the average rating was BBB+.

Residential mortgage-backed and other asset-backed securities consisted of securitizations of receivables valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 78% of the securities were rated and the average rating was AAA. At December 31, 2017, 21% of the securities were rated and the average rating was AAA.

Other investments consisted of convertible securities for which limited observable inputs were available at March 31, 2018 and December 31, 2017. The securities were valued internally based on expected cash flows, including the expected final recovery, discounted at a yield that considered the lack of liquidity and the financial status of the issuer.

Quantitative Information Regarding Level 3 Valuations

	Fair Value at
(In thousands)	March 31, 2018	December 31, 2017	Valuation Technique	Unobservable Input	Range (Weighted Average)
Assets:
Corporate debt, limited observable inputs	$15,097	$13,703	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Residential mortgage-backed and other asset-backed securities	$17,323	$4,986	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Other investments	$365	$409	Discounted Cash Flows	Comparability Adjustment	0% - 10% (5%)

The significant unobservable inputs used in the fair value measurement of the above listed securities were the valuations of comparable securities with similar issuers, credit quality and maturity. Changes in the availability of comparable securities could result in changes in the fair value measurements.

20

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Fair Value Measurements - Level 3 Assets

The following tables (the Level 3 Tables) present summary information regarding changes in the fair value of assets measured at fair value using Level 3 inputs.

	March 31, 2018
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments			Total
Balance December 31, 2017	$	13,703		$	4,986		$	409		$	19,098
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(38		)	—			—			(38		)
Net realized investment gains (losses)	—			—			(44		)	(44		)
Included in other comprehensive income	(38		)	(30		)	—			(68		)
Purchases	6,005			13,453			—			19,458
Sales	(2,905		)	(27		)	—			(2,932		)
Transfers in	2,069			—			—			2,069
Transfers out	(3,699		)	(1,059		)	—			(4,758		)
Balance March 31, 2018	$	15,097		$	17,323		$	365		$	32,785
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—		$	—

	March 31, 2017
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments		Total
Balance December 31, 2016	$	14,810		$	3,007		$	3	$	17,820
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(39		)	—			—		(39		)
Net realized investment gains (losses)	13			—			—		13
Included in other comprehensive income	(208		)	(5		)	2		(211		)
Purchases	7,048			—			—		7,048
Sales	(1,712		)	—			—		(1,712		)
Transfers in	—			—			898		898
Transfers out	(998		)	—			—		(998		)
Balance March 31, 2017	$	18,914		$	3,002		$	903	$	22,819
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—	$	—

21

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Transfers

There were no transfers between the Level 1 and Level 2 categories during the three months endedMarch 31, 2018. During the three months endedMarch 31, 2017, equity securities of approximately $35.4 million were transferred from Level 2 to Level 1.

Transfers shown in the preceding Level 3 tables were as of the end of the quarter in which the transfer occurred. All transfers were to or from Level 2.

All transfers during the three months endedMarch 31, 2018 and 2017 related to securities held for which the level of market activity for identical or nearly identical securities varies from period to period. The securities were valued using multiple observable inputs when those inputs were available; otherwise the securities were valued using limited observable inputs.

Fair Values Not Categorized

At March 31, 2018 and December 31, 2017, certain LPs/LLCs and investment funds measure fund assets at fair value on a recurring basis and provide a NAV for ProAssurance's interest. The carrying value of these interests is based on the NAV provided and was considered to approximate the fair value of the interests. For investment in unconsolidated subsidiaries, ProAssurance recognizes any changes in the NAV of its interests in equity in earnings (loss) of unconsolidated subsidiaries during the period of change. In accordance with GAAP, the fair value of these investments was not classified within the fair value hierarchy. The amount of ProAssurance's unfunded commitments related to these investments as of March 31, 2018 and fair values of these investments as of March 31, 2018 and December 31, 2017 was as follows:

	Unfunded Commitments	Fair Value
(In thousands)	March 31, 2018	March 31, 2018		December 31, 2017
Equity investments:
Mortgage fund (1)*	None	$	20,215	$	—
Investment in unconsolidated subsidiaries:
Private debt funds (2)	$4,976	32,064		42,206
Long equity fund (3)	None	7,957		7,847
Long/short equity funds (4)	None	32,177		31,352
Non-public equity funds (5)	$82,135	105,049		100,062
Multi-strategy fund of funds (6)	None	9,274		9,100
Credit funds (7)	None	17,789		6,561
Long/short commodities fund (8)	None	13,063		13,025
Strategy focused funds (9)	$19,241	59,721		606
		277,094		210,759
Other investments:
Mortgage fund (1)*	See above	—		20,130
Total investments carried at NAV		$	297,309	$	230,889
* In the first quarter of 2018, ProAssurance began presenting this investment previously reported as a part of other investments as a part of equity investments on the Condensed Consolidated Balance Sheet as of March 31, 2018. Prior year amounts have not been reclassified.

Below is additional information regarding each of the investments listed in the table above as of March 31, 2018.

⁽¹⁾  This investment fund is focused on the structured mortgage market. The fund will primarily invest in U.S. Agency mortgage-backed securities. Redemptions are allowed at the end of any calendar quarter with a prior notice requirement of 65 days and are paid within 45 days at the end of the redemption dealing day.

22

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

⁽²⁾  The investment is comprised of interests in two unrelated LP funds that are structured to provide interest distributions primarily through diversified portfolios of private debt instruments. One LP allows redemption by special consent; the other does not permit redemption. Income and capital are to be periodically distributed at the discretion of the LPs over an anticipated time frame that spans from three to eight years.

⁽³⁾  The fund is a LP that holds long equities of public international companies. Redemptions are allowed at the end of any calendar month with a prior notice requirement of 15 days and are paid within 10 days of the end of the calendar month of the redemption request.

⁽⁴⁾  The investment is comprised of interests in multiple unrelated LP funds. The funds hold primarily long and short North American equities and target absolute returns using strategies designed to take advantage of market opportunities. The funds generally permit quarterly or semi-annual capital redemptions subject to notice requirements of 30 to 90 days. For some funds, redemptions above specified thresholds (lowest threshold is 90%) may be only partially payable until after a fund audit is completed and are then payable within 30 days.

⁽⁵⁾  The investment is comprised of interests in multiple unrelated LP funds, each structured to provide capital appreciation through diversified investments in private equity, which can include investments in buyout, venture capital, debt including senior, second lien and mezzanine, distressed debt and other private equity-oriented LPs. Two of the LPs allow redemption by terms set forth in the LP agreements; the others do not permit redemption. Income and capital are to be periodically distributed at the discretion of the LP over time frames that are anticipated to span up to nine years.

⁽⁶⁾  This fund is a LLC structured to build and manage low volatility, multi-manager portfolios that have little or no correlation to the broader fixed income and equity security markets. Redemptions are not permitted but offers to repurchase units of the LLC may be extended periodically.

⁽⁷⁾  The investment is comprised of two unrelated LP funds. One fund seeks to obtain superior risk-adjusted absolute returns through a diversified portfolio of debt securities, including bonds, loans and other asset-backed instruments. The second fund seeks event driven opportunities across the corporate credit spectrum. For both funds, redemptions are allowed at any quarter-end with a prior notice requirement of 90 days.

⁽⁸⁾  This fund is a LLC invested across a broad range of commodities and focuses primarily on market neutral, relative value strategies, seeking to generate absolute returns with low correlation to broad commodity, equity and fixed income markets. Following an initial one-year lock-up period, redemptions are allowed with a prior notice requirement of 30 days and are payable within 30 days.

⁽⁹⁾ The investment is comprised of multiple unrelated LP funds. One fund is a LLC focused on investing in North American consumer products companies, comprised of equity and equity-related securities, as well as debt instruments. Redemptions are not permitted. Another fund is a LP focused on North American energy infrastructure assets that allows redemption with consent of the General Partner. The remaining funds are real estate focused LPs, one of which allows for redemption with prior notice.

ProAssurance may not sell, transfer or assign its interest in any of the above LPs/LLCs without special consent from the LPs/LLCs.

Nonrecurring Fair Value Measurement

At March 31, 2018, ProAssurance did not have any assets or liabilities that were measured at fair value on a nonrecurring basis. At December 31, 2017, ProAssurance held an equity method early stage business investment measured at fair value on a nonrecurring basis due to a recognized OTTI of $8.5 million. The investment was valued using significant unobservable inputs (Level 3) and had a fair value of $1.2 million at December 31, 2017. The fair value of the investment was measured as ProAssurance's ownership percentage in the projected earnings and cash flows expected to be generated by the investment.

23

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Financial Instruments - Methodologies Other Than Fair Value

The following table provides the estimated fair value of our financial instruments that, in accordance with GAAP for the type of investment, are measured using a methodology other than fair value. All fair values provided primarily fall within the Level 3 fair value category.

	March 31, 2018				December 31, 2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Financial assets:
BOLI	$	62,562	$	62,562	$	62,113	$	62,113
Other investments	$	2,902	$	2,902	$	58,546	$	69,095
Other assets	$	49,549	$	48,816	$	34,020	$	33,742
Financial liabilities:
Senior notes due 2023*	$	250,000	$	269,418	$	250,000	$	273,153
Revolving Credit Agreement*	$	83,000	$	83,000	$	123,000	$	123,000
Mortgage loans*	$	40,111	$	40,111	$	40,460	$	40,460
Other liabilities	$	21,525	$	21,525	$	21,154	$	21,154
* Carrying value excludes debt issuance costs.

The fair value of the BOLI was equal to the cash surrender value associated with the policies on the valuation date.

Other investments listed in the table above include FHLB common stock carried at cost and an annuity investment carried at amortized cost. Two of ProAssurance's insurance subsidiaries are members of an FHLB. The estimated fair value of the FHLB common stock was based on the amount the subsidiaries would receive if their memberships were canceled, as the memberships cannot be sold. The fair value of the annuity represents the present value of the expected future cash flows discounted using a rate available in active markets for similarly structured instruments.

Other assets and other liabilities primarily consisted of related investment assets and liabilities associated with funded deferred compensation agreements. The fair value of the funded deferred compensation assets was based upon quoted market prices, which is categorized as a Level 1 valuation, and had a fair value of $21.6 million and $20.2 million at March 31, 2018 and December 31, 2017, respectively. The deferred compensation liabilities are adjusted to match the fair value of the deferred compensation assets. Other assets also included a secured note receivable and unsecured note receivable under two separate line of credit agreements. Fair value of these notes receivable was based on the present value of expected cash flows from the notes receivable, discounted at market rates on the valuation date for receivables with similar credit standings and similar payment structures.

The fair value of the debt was estimated based on the present value of expected future cash outflows, discounted at rates available on the valuation date for similar debt issued by entities with a similar credit standing to ProAssurance.

24

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

3. Investments

Available-for-sale fixed maturities at March 31, 2018 and December 31, 2017 included the following:

	March 31, 2018
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	305	$	2,209	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		27		445		29,959
State and municipal bonds	324,336		6,613		954		329,995
Corporate debt	1,259,132		7,008		17,877		1,248,263
Residential mortgage-backed securities	217,891		1,502		3,973		215,420
Agency commercial mortgage-backed securities	15,078		29		220		14,887
Other commercial mortgage-backed securities	29,409		100		314		29,195
Other asset-backed securities	157,506		40		1,333		156,213
	$	2,165,384	$	15,624	$	27,325	$	2,153,683
	December 31, 2017
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	134,323	$	485	$	1,181	$	133,627
U.S. Government-sponsored enterprise obligations	21,089		73		206		20,956
State and municipal bonds	618,414		14,248		419		632,243
Corporate debt	1,157,660		15,205		5,707		1,167,158
Residential mortgage-backed securities	196,741		2,438		1,335		197,844
Agency commercial mortgage-backed securities	10,827		23		108		10,742
Other commercial mortgage-backed securities	16,004		91		134		15,961
Other asset-backed securities	102,130		47		466		101,711
	$	2,257,188	$	32,610	$	9,556	$	2,280,242

25

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

The recorded cost basis and estimated fair value of available-for-sale fixed maturities at March 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(In thousands)	Amortized Cost		Due in one year or less		Due after one year through five years		Due after five years through ten years		Due after ten years		Total Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	31,700	$	73,858	$	21,321	$	2,872	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		—		8,009		21,814		136		29,959
State and municipal bonds	324,336		29,481		111,512		140,004		48,998		329,995
Corporate debt	1,259,132		115,385		682,646		404,159		46,073		1,248,263
Residential mortgage-backed securities	217,891										215,420
Agency commercial mortgage-backed securities	15,078										14,887
Other commercial mortgage-backed securities	29,409										29,195
Other asset-backed securities	157,506										156,213
	$	2,165,384									$	2,153,683

Excluding obligations of the U.S. Government, U.S. Government-sponsored enterprises and a U.S. Government obligations money market fund, no investment in any entity or its affiliates exceeded 10% of shareholders’ equity at March 31, 2018.

Cash and securities with a carrying value of $45.8 million at March 31, 2018 were on deposit with various state insurance departments to meet regulatory requirements. ProAssurance also held securities with a carrying value of $120.1 million at March 31, 2018 that are pledged as collateral security for advances under the Revolving Credit Agreement (see Note 7 for additional detail on the Revolving Credit Agreement).

As a member of Lloyd's and a capital provider to Syndicate 1729 and Syndicate 6131, which began active operations on January 1, 2018, ProAssurance is required to maintain capital at Lloyd's, referred to as FAL. ProAssurance's FAL investments at March 31, 2018 included fixed maturities with a fair value of $123.5 million and short-term investments with a fair value of approximately $0.4 million on deposit with Lloyd's in order to satisfy these FAL requirements.

26

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Investments Held in a Loss Position

The following tables provide summarized information with respect to investments held in an unrealized loss position at March 31, 2018 and December 31, 2017, including the length of time the investment had been held in a continuous unrealized loss position.

	March 31, 2018
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	121,718	$	2,209	$	87,740	$	1,438	$	33,978	$	771
U.S. Government-sponsored enterprise obligations	29,018		445		22,252		218		6,766		227
State and municipal bonds	63,690		954		55,761		620		7,929		334
Corporate debt	848,499		17,877		733,344		13,216		115,155		4,661
Residential mortgage-backed securities	175,295		3,973		132,075		2,066		43,220		1,907
Agency commercial mortgage-backed securities	9,547		220		7,638		101		1,909		119
Other commercial mortgage-backed securities	19,145		314		15,723		256		3,422		58
Other asset-backed securities	118,780		1,333		105,370		1,134		13,410		199
	$	1,385,692	$	27,325	$	1,159,903	$	19,049	$	225,789	$	8,276

	December 31, 2017
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	110,788	$	1,181	$	67,135	$	554	$	43,653	$	627
U.S. Government-sponsored enterprise obligations	17,032		206		10,182		64		6,850		142
State and municipal bonds	23,122		419		15,168		102		7,954		317
Corporate debt	487,578		5,707		365,541		2,730		122,037		2,977
Residential mortgage-backed securities	109,659		1,335		64,121		402		45,538		933
Agency commercial mortgage-backed securities	4,423		108		2,458		34		1,965		74
Other commercial mortgage-backed securities	12,878		134		7,939		82		4,939		52
Other asset-backed securities	85,358		466		70,924		346		14,434		120
	$	850,838	$	9,556	$	603,468	$	4,314	$	247,370	$	5,242

As of March 31, 2018, excluding U.S. Government or U.S. Government-sponsored enterprise obligations, there were 943 debt securities (44.9% of all available-for-sale fixed maturity securities held) in an unrealized loss position representing 494 issuers. The greatest and second greatest unrealized loss positions among those securities were approximately $0.5 million and $0.4 million, respectively. The securities were evaluated for OTTI as of March 31, 2018.

As of December 31, 2017, excluding U.S. Government or U.S. Government-sponsored enterprise obligations, there were 629 debt securities (26.5% of all available-for-sale fixed maturity securities held) in an unrealized loss position representing 375 issuers. The greatest and second greatest unrealized loss positions among those securities were approximately $0.4 million and $0.3 million, respectively. The securities were evaluated for OTTI as of December 31, 2017.

Each quarter, ProAssurance performs a detailed analysis for the purpose of assessing whether any of the securities it holds in an unrealized loss position has suffered an OTTI. A detailed discussion of the factors considered in the assessment is

27

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

included in Note 1 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

Fixed maturity securities held in an unrealized loss position at March 31, 2018, excluding asset-backed securities, have paid all scheduled contractual payments and are expected to continue doing so. Expected future cash flows of asset-backed securities, excluding those issued by GNMA, FNMA and FHLMC, held in an unrealized loss position were estimated as part of the March 31, 2018OTTI evaluation using the most recently available six-month historical performance data for the collateral (loans) underlying the security or, if historical data was not available, sector based assumptions, and equaled or exceeded the current amortized cost basis of the security.

Other information regarding sales and purchases of fixed maturity available-for-sale securities is as follows:

	Three Months Ended March 31
(In millions)	2018		2017
Proceeds from sales (exclusive of maturities and paydowns)	$	379.2	$	79.2
Purchases	$	367.9	$	160.4

Equity Investments

ProAssurance's equity investments are carried at fair value with changes in fair value recognized in income as a component of net realized investment gains (losses) during the period of change. Equity investments on the Condensed Consolidated Balance Sheet as of March 31, 2018 primarily included stocks, bonds and investment funds.

Short-term Investments

ProAssurance's short-term investments, which have a maturity at purchase of one year or less, are primarily comprised of investments in U.S. treasury obligations, commercial paper and money market funds. Short-term investments are carried at cost, which approximates fair value.

BOLI

ProAssurance holds BOLI policies that are carried at the current cash surrender value of the policies (original cost $33 million). All insured individuals were members of ProAssurance management at the time the policies were acquired. The primary purpose of the program is to offset future employee benefit expenses through earnings on the cash value of the policies. ProAssurance is the owner and beneficiary of these policies.

Net Investment Income

Net investment income by investment category was as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Fixed maturities	$	17,080		$	20,121
Equities	4,867			3,644
Short-term investments, including Other	1,308			801
BOLI	449			455
Investment fees and expenses	(1,677		)	(1,835		)
Net investment income	$	22,027		$	23,186

28

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Investment in Unconsolidated Subsidiaries

ProAssurance's investment in unconsolidated subsidiaries were as follows:

	March 31, 2018	Carrying Value
(In thousands)	Percentage Ownership	March 31, 2018		December 31, 2017
Qualified affordable housing project tax credit partnerships	See below	$	80,507	$	84,607
Other tax credit partnerships	See below	5,735		6,118
All other investments, primarily investment fund LPs/LLCs	See below	314,788		239,866
		$	401,030	$	330,591

Qualified affordable housing project tax credit partnership interests held by ProAssurance generate investment returns by providing tax benefits to fund investors in the form of tax credits and project operating losses. The carrying value of these investments reflects ProAssurance's total commitments (both funded and unfunded) to the partnerships, less any amortization. ProAssurance's ownership percentage relative to two of the tax credit partnership interests is almost 100%; these interests had a carrying value of $30.7 million at March 31, 2018 and $32.5 million at December 31, 2017. ProAssurance's ownership percentage relative to the remaining tax credit partnership interests is less than 20%; these interests had a carrying value of $49.8 million at March 31, 2018 and $52.1 million at December 31, 2017. Since ProAssurance has the ability to exert influence over the partnerships but does not control them, all are accounted for using the equity method. See further discussion of the entities in which ProAssurance holds passive interests in Note 10.

Other tax credit partnerships are comprised entirely of historic tax credits. The historic tax credits generate investment returns by providing benefits to fund investors in the form of tax credits, tax deductible project operating losses and positive cash flows. The carrying value of these investments reflects ProAssurance's total funded commitments less any amortization. ProAssurance's ownership percentage relative to the tax credit partnerships is almost 100%. Since ProAssurance has the ability to exert influence over the partnerships but does not control them, all are accounted for using the equity method. See further discussion of the entities in which ProAssurance holds passive interests in Note 10.

ProAssurance holds interests in investment fund LPs/LLCs and other equity method investments and LPs/LLCs which are not considered to be investment funds. ProAssurance's ownership percentage relative to three of the LPs/LLCs is greater than 25%, which is expected to be reduced as the funds mature and other investors participate in the funds; these investments had a carrying value of $31.3 million at March 31, 2018 and $30.8 million at December 31, 2017. ProAssurance's ownership percentage relative to the remaining investments and LPs/LLCs is less than 25%; these interests had a carrying value of $283.5 million at March 31, 2018 and $209.1 million at December 31, 2017. ProAssurance does not have the ability to exert control over any of these funds.

Equity in Earnings (Loss) of Unconsolidated Subsidiaries

Equity in earnings (loss) of unconsolidated subsidiaries included losses from qualified affordable housing project tax credit investments and historic tax credit investments. The losses recorded reflect ProAssurance's allocable portion of partnership operating losses. Losses from qualified affordable housing project tax credit investments were $4.1 million and $3.3 million for the 2018 and 2017three-month periods, respectively, and tax credits recognized related to these investments totaled $4.6 million for both the 2018 and 2017three-month periods. Losses from historic tax credit investments were $1.9 million and $0.4 million and tax credits recognized related to these investments totaled $0.7 million and $1.8 million for the 2018 and 2017three-month periods, respectively. Tax credits recognized reduced income tax expense in the respective periods.

29

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Net Realized Investment Gains (Losses)

Realized investment gains and losses are recognized on the first-in, first-out basis. The following table provides detailed information regarding net realized investment gains (losses):

	Three Months Ended March 31
(In thousands)	2018			2017
Total OTTI losses:
Corporate debt	$	—		$	(419	)
Portion of OTTI losses recognized in other comprehensive income before taxes:
Corporate debt	—			248
Net impairment losses recognized in earnings	—			(171		)
Gross realized gains, available-for-sale fixed maturities	4,464			1,853
Gross realized (losses), available-for-sale fixed maturities	(2,047		)	(67		)
Net realized gains (losses), equity investments	9,219			6,562
Net realized gains (losses), other investments	688			1,172
Change in unrealized holding gains (losses), trading fixed maturities	(49		)	—
Change in unrealized holding gains (losses), equity investments	(23,845		)	3,616
Change in unrealized holding gains (losses), convertible securities, carried at fair value	(954		)	313
Other	7			2
Net realized investment gains (losses)	$	(12,517	)	$	13,280

ProAssurance did not recognize any OTTI during the first quarter of 2018. During the first quarter of 2017, ProAssurance recognized OTTI in earnings of $0.2 million and $0.2 million of non-credit OTTI in OCI, both of which related to corporate bonds.

The following table presents a roll forward of cumulative credit losses recorded in earnings related to impaired debt securities for which a portion of the OTTI was recorded in OCI.

	Three Months Ended March 31
(In thousands)	2018		2017
Balance beginning of period	$	1,313	$	1,158
Additional credit losses recognized during the period, related to securities for which:
No OTTI has been previously recognized	—		171
Balance March 31	$	1,313	$	1,329

4. Income Taxes

ProAssurance estimates its annual effective tax rate at the end of each quarterly reporting period and uses this estimated rate to record the provision for income taxes in the interim financial statements. The provision for income taxes is different from that which would be obtained by applying the statutory federal income tax rate to income before income taxes primarily because a portion of ProAssurance’s investment income is tax-exempt, and because ProAssurance utilizes tax credit benefits transferred from tax credit partnership investments. In addition, ProAssurance's provision for income taxes in 2018 was impacted by certain provisions of the TCJA, as discussed below.

ProAssurance had a total liability for federal and U.K. income taxes of $6.3 million at March 31, 2018 and $8.0 million at December 31, 2017, both carried as a part of other liabilities. The liability for unrecognized tax benefits, which is included in the total liability for federal and U.K. income taxes, was $5.2 million and $5.8 million at March 31, 2018 and December 31, 2017, respectively, which included an accrued liability for interest of approximately $0.6 million and $0.5 million, respectively.

30

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Tax Cuts and Jobs Act

The TCJA was signed into law on December 22, 2017 and contains several key provisions that impact the Company's business, including the reduction of the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, the reduction in the amount of executive compensation that could qualify as a tax deduction, a minimum tax on payments made to related foreign entities and a change in how property and casualty taxpayers discount loss reserves.

Effective January 1, 2018, the TCJA introduced a minimum tax on payments made to related foreign entities referred to as the BEAT. The BEAT is imposed by adding back into the U.S. tax base any base erosion payment made by the U.S. taxpayer to a related foreign entity and applying a minimum tax rate to this newly calculated modified taxable income. Base erosion payments represent any amount paid or accrued by the U.S. taxpayer to a related foreign entity for which a deduction is allowed. Premiums the Company cedes to the SPCs at its newly formed wholly owned Cayman Islands reinsurance subsidiary, Inova Re, do not fall within the scope of base erosion payments as the SPCs at Inova Re intend to elect to be taxed as U.S. taxpayers. However, premiums the Company cedes to the one active SPC at its wholly owned Cayman Islands reinsurance subsidiary, Eastern Re, fall within the scope of base erosion payments and therefore could be significantly impacted by the BEAT. See further discussion on the Company’s new subsidiary, Inova Re, and its Cayman Islands SPC operations in Note 12. Management has evaluated its exposure to the BEAT and has concluded that the Company’s outbound deductible payments to related foreign entities are below the threshold for application of the BEAT; therefore, ProAssurance has not recognized any incremental tax expense for the BEAT provision of the TCJA for the three months endedMarch 31, 2018.

ProAssurance was able to complete its accounting for all areas of the TCJA during the period of enactment except as described below.

Provisional amount

As noted in ProAssurance's December 31, 2017 Form 10-K, ProAssurance was able to make a reasonable estimate of the effects on its existing deferred tax asset balances at December 31, 2017 as it relates to the limitation on the future deductibility of certain executive compensation and recorded a provisional charge to income tax expense from continuing operations for the year ended December 31, 2017. As of March 31, 2018, ProAssurance has not made any measurement-period adjustments to this provisional amount and any future guidance from the IRS addressing the effects of the TCJA on executive compensation could result in a material change to this provisional amount.

Provisional amount not reasonably estimable

As noted in ProAssurance's December 31, 2017 Form 10-K, ProAssurance was unable to reasonably estimate the impact of the change in loss reserve discounting factors due to the TCJA; therefore, no provisional amount was recorded at December 31, 2017. As of March 31, 2018, the IRS has yet to release the 2018 discount factors; therefore, ProAssurance has not adjusted its deferred tax balances due to the enactment of the TCJA. ProAssurance continues to utilize the discount factors based on existing accounting guidance and the provisions of the tax laws that were in effect immediately prior to enactment of the TCJA. Once the IRS releases the 2018 loss reserve discount factors, ProAssurance will complete its analysis and include the effect of the difference in the reserve discount factors in the period the analysis is complete or the impact is reasonably estimable.

5. Reserve for Losses and Loss Adjustment Expenses

The reserve for losses is established based on estimates of individual claims and actuarially determined estimates of future losses based on ProAssurance’s past loss experience, available industry data and projections as to future claims frequency, severity, inflationary trends and settlement patterns. Estimating the reserve, particularly the reserve appropriate for liability exposures, is a complex process. Claims may be resolved over an extended period of time, often five years or more, and may be subject to litigation. Estimating losses requires ProAssurance to make and revise judgments and assessments regarding multiple uncertainties over an extended period of time. As a result, the reserve estimate may vary considerably from the eventual outcome. The assumptions used in establishing ProAssurance’s reserve are regularly reviewed and updated by management as new data becomes available. Changes to estimates of previously established reserves are included in earnings in the period in which the estimate is changed.

ProAssurance believes that the methods it uses to establish reserves are reasonable and appropriate. Each year, ProAssurance uses internal actuaries to review the reserve for losses of each insurance subsidiary. ProAssurance also engages consulting actuaries to review ProAssurance claims data and provide observations regarding cost trends, rate adequacy and ultimate loss costs. ProAssurance considers the views of the actuaries as well as other factors, such as known, anticipated or estimated changes in frequency and severity of claims, loss retention levels and premium rates, in establishing the amount of its

31

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

reserve for losses. The statutory filings of each insurance company with the insurance regulators must be accompanied by a consulting actuary's certification as to their respective reserves.

ProAssurance partitions its reserve by accident year, which is the year in which the claim becomes its liability. As claims are incurred (reported) and claim payments are made, they are aggregated by accident year for analysis purposes. ProAssurance also partitions its reserve by reserve type: case reserves and IBNR reserves. Case reserves are established by the claims department based upon the particular circumstances of each reported claim and represent ProAssurance’s estimate of the future loss costs (often referred to as expected losses) that will be paid on reported claims. Case reserves are decremented as claim payments are made and are periodically adjusted upward or downward as estimates regarding the amount of future losses are revised; a reported loss for an individual claim equates to the case reserve at any point in time plus the claim payments that have been made to date. IBNR reserves represent an estimate, in the aggregate, of future development on losses that have been reported to ProAssurance plus an estimate of losses that have been incurred but not reported.

Development of Prior Accident Years

In addition to setting the initial reserve for the current accident year, each period ProAssurance reassesses the amount of reserve required for prior accident years. The foundation of ProAssurance’s reserve re-estimation process is an actuarial analysis that is performed by both the internal and consulting actuaries. This detailed analysis projects ultimate losses based on partitions which include line of business, geography, coverage layer and accident year. The procedure uses the most representative data for each partition, capturing its unique patterns of development and trends. In all, there are 200 different partitions of ProAssurance's business for purposes of this analysis. ProAssurance believes that the use of consulting actuaries provides an independent view of the loss data as well as a broader perspective on industry loss trends.

Activity in the reserve for losses and loss adjustment expenses is summarized as follows:

(In thousands)	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017			Year Ended December 31, 2017
Balance, beginning of year	$	2,048,381		$	1,993,428		$	1,993,428
Less reinsurance recoverables on unpaid losses and loss adjustment expenses	335,585			273,475			273,475
Net balance, beginning of year	1,712,796			1,719,953			1,719,953
Net losses:
Current year	152,572			147,927			603,518
Favorable development of reserves established in prior years, net	(22,786		)	(28,776		)	(134,360		)
Total	129,786			119,151			469,158
Paid related to:
Current year	(14,243		)	(33,085		)	(106,633		)
Prior years	(101,078		)	(80,709		)	(369,682		)
Total paid	(115,321		)	(113,794		)	(476,315		)
Net balance, end of period	1,727,261			1,725,310			1,712,796
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses	329,540			271,679			335,585
Balance, end of period	$	2,056,801		$	1,996,989		$	2,048,381

The favorable loss development of $22.8 million recognized in the three months endedMarch 31, 2018 primarily reflected a lower than anticipated claims severity trend (i.e., the average size of a claim) for accident years 2011 through 2015. The favorable loss development of $28.8 million recognized in the three months endedMarch 31, 2017 primarily reflected a lower than anticipated claims severity trend for accident years 2009 through 2014. The favorable loss development of $134.4 million recognized in the twelve months ended December 31, 2017 primarily reflected a lower than anticipated claims severity trend for accident years 2010 through 2014.

For additional information regarding ProAssurance's reserve for losses, see Note 1 and Note 7 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

32

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

6. Commitments and Contingencies

ProAssurance is involved in various legal actions related to insurance policies and claims handling including, but not limited to, claims asserted by policyholders. These types of legal actions arise in the Company's ordinary course of business and, in accordance with GAAP for insurance entities, are considered as a part of the Company's loss reserving process, which is described in detail under the heading "Losses and Loss Adjustment Expenses" in the Accounting Policies section in Note 1 of the Notes to Consolidated Financial Statements in ProAssurance's 2017 Form 10-K.

As a member of Lloyd's, ProAssurance is required to provide capital to support its Lloyd's Syndicates through 2022 of up to $200 million, referred to as FAL. At March 31, 2018, ProAssurance is satisfying the FAL requirement with investment securities on deposit with Lloyd's with a carrying value of $123.9 million (see Note 3).

ProAssurance has issued an unconditional revolving credit agreement to the Premium Trust Fund of Syndicate 1729 for the purpose of providing working capital. Permitted borrowings were expanded from £20.0 million to £30.0 million under an amended Syndicate Credit Agreement executed in February 2018. Under the amended Syndicate Credit Agreement, advances bear interest at 3.8% annually and may be repaid at any time but are repayable upon demand after December 31, 2019. As of March 31, 2018, the unused commitment under the Syndicate Credit Agreement approximated £3.3 million (approximately $4.6 million).

7. Debt

ProAssurance’s outstanding debt consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
Senior Notes due 2023, unsecured, interest at 5.3% annually	$	250,000	$	250,000
Revolving Credit Agreement, outstanding borrowings are fully secured, see Note 3, and carried at a weighted average interest rate of 2.24% and 1.91%, respectively. Outstanding borrowings are not permitted to exceed $250 million aggregately; Revolving Credit Agreement expires in 2020. The interest rate on the borrowings is set at the time the respective borrowing is initiated or renewed. The current borrowing can be repaid or renewed in the second quarter of 2018. If renewed, the interest rate will be reset.	83,000		123,000
Mortgage Loans, outstanding borrowings are secured by first priority liens on two office buildings, and bear an interest rate of three-month LIBOR plus 1.325% (3.42% and 2.86%, respectively) determined on a quarterly basis.	40,111		40,460
Total principal	373,111		413,460
Less debt issuance costs	1,583		1,649
Debt less debt issuance costs	$	371,528	$	411,811

Covenant Compliance

There are no financial covenants associated with the Senior Notes due 2023.

The Revolving Credit Agreement contains customary representations, covenants and events constituting default, and remedies for default. The Revolving Credit Agreement also defines financial covenants regarding permitted leverage ratios. ProAssurance is currently in compliance with all covenants of the Revolving Credit Agreement.

The Mortgage Loans contain customary representations, covenants and events constituting default, and remedies for default. The Mortgage Loans also define a financial covenant regarding a permitted leverage ratio for each of the two ProAssurance subsidiaries that entered into the Mortgage Loans. ProAssurance's subsidiaries are currently in compliance with the financial covenant of the Mortgage Loans.

Additional Information

For additional information regarding ProAssurance's debt, see Note 9 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

33

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

8. Derivatives

ProAssurance is exposed to certain risks relating to its ongoing business and investment activities. ProAssurance utilizes derivative instruments as part of its risk management strategy to reduce the market risk related to fluctuations in future interest rates associated with a portion of its variable-rate debt. As of March 31, 2018, ProAssurance has not designated any derivative instruments as hedging instruments and does not use derivative instruments for trading purposes.

ProAssurance utilizes an interest rate cap agreement with the objective of reducing the Company's exposure to interest rate risk related to its variable-rate Mortgage Loans. Additional information regarding the Company's Mortgage Loans is provided in Note 7. Under the terms of the interest rate cap agreement, ProAssurance paid a premium of $2 million in the fourth quarter of 2017 for the right to receive cash payments based upon a notional amount of $35 million if and when the three-month LIBOR rises above 235 basis points. The Company's variable-rate Mortgage Loans bear an interest rate of three-month LIBOR plus 132.5 basis points. Therefore, this derivative instrument is effectively ensuring the interest rate related to the Mortgage Loans is capped at a maximum of 367.5 basis points until expiration of the interest rate cap agreement in October 2027. ProAssurance has designated the interest rate cap as an economic hedge (non-hedging instrument) of interest rate exposure and any change in fair value of the derivative is immediately recognized in earnings during the period of change.

The following table provides a summary of the volume and fair value position of the interest rate cap as well as the reporting location in the Condensed Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017.

($ in thousands)		March 31, 2018					December 31, 2017
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Balance Sheets	Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)		Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)
Interest Rate Cap	Other assets	1	$	35,000	$	2,306	1	$	35,000	$	1,731
(1) Volume is represented by the derivative instrument's notional amount.
(2) Additional information regarding the fair value of the Company's interest rate cap is provided in Note 2.

The following table presents the pre-tax impact of the change in the fair value of the interest rate cap and the reporting location in the Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2018 and 2017.

		Gains (Losses) Recognized in Income on Derivatives
(In thousands)		Three Months Ended March 31
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Statements of Income and Comprehensive Income	2018		2017
Interest Rate Cap	Interest expense	$	575	$	—

As a result of this derivative instrument, ProAssurance is exposed to risk that the counterparty will fail to meet their contractual obligations. To mitigate this counterparty credit risk, ProAssurance only enters into derivative contracts with carefully selected major financial institutions based upon their credit ratings and monitors their creditworthiness. As of March 31, 2018, the counterparty had an investment grade rating of BBB- and has performed in accordance with their contractual obligations.

34

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

9. Shareholders’ Equity

At March 31, 2018 and December 31, 2017, ProAssurance had 100 million shares of authorized common stock and 50 million shares of authorized preferred stock. The Board has the authority to determine provisions for the issuance of preferred shares, including the number of shares to be issued, the designations, powers, preferences and rights, and the qualifications, limitations or restrictions of such shares. To date, the Board has not approved the issuance of preferred stock.

ProAssurance declared cash dividends of $0.31 per share during the first quarters of both 2018 and 2017, totaling $16.6 million and $16.5 million, respectively.

At March 31, 2018, Board authorizations for the repurchase of common shares or the retirement of outstanding debt of $109.6 million remained available for use. ProAssurance did not repurchase any common shares during the three months endedMarch 31, 2018 and 2017.

Share-based compensation expense and related tax benefits were as follows:

	Three Months Ended March 31
(In thousands)	2018		2017
Share-based compensation expense	$	902	$	3,346
Related tax benefits	$	190	$	1,171

ProAssurance awarded approximately 85,800 restricted share units and 27,200 base performance share units to employees in February 2018. The fair value of each unit awarded was estimated at $44.73, equal to the market value of a ProAssurance common share on the date of grant less the estimated present value of dividends during the vesting period. All awards are charged to expense as an increase to additional paid-in capital over the service period (generally the vesting period) associated with the award. Restricted share units and performance share units vest in their entirety at the end of a three-year period following the grant date based on a continuous service requirement and, for performance share units, achievement of a performance objective. Partial vesting is permitted for retirees. A ProAssurance common share is issued for each unit once vesting requirements are met, except that units sufficient to satisfy required tax withholdings are paid in cash. The number of common shares issued for performance share units varies from 50% to 200% of base awards depending upon the degree to which stated performance objectives are achieved. ProAssurance issued approximately 52,800 and 80,600 common shares to employees in February 2018 related to restricted share units and performance share units, respectively, granted in 2015. Performance share units for the 2015 award were issued at a level of 125%.

ProAssurance issued approximately 2,500 common shares to employees in February 2018 as bonus compensation, as approved by the Compensation Committee of the Board. The shares issued were valued at fair value (the market price of a ProAssurance common share on the date of award).

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)

For the three months endedMarch 31, 2018 and 2017, OCI was almost entirely comprised of unrealized gains and losses, including non-credit impairment losses, arising during the period related to fixed maturity available-for-sale securities, less reclassification adjustments, as shown in the table that follows, net of tax. For the three months endedMarch 31, 2018 and 2017, OCI included changes related to the reestimation of the defined benefit plan liability assumed in the Eastern acquisition which were nominal in amount. The defined benefit plan is frozen as to the earnings of additional benefits and the benefit plan liability is reestimated annually.

At March 31, 2018 and December 31, 2017, AOCI was almost entirely comprised of accumulated unrealized gains and losses from fixed maturity available-for-sale securities, including accumulated non-credit impairments recognized through OCI of $0.6 million and $0.5 million, respectively, net of tax. At March 31, 2018 and December 31, 2017, accumulated changes in the defined benefit plan liability not yet recognized in earnings were nominal in amount. Due to the adoption of accounting guidance in the first quarter of 2018 related to certain impacts of the TCJA, ProAssurance increased AOCI by approximately $3.4 million with a corresponding decrease to retained earnings of the same amount as of the beginning of 2018. See Note 1 for additional information on accounting guidance adopted during the period. At March 31, 2018 and December 31, 2017, tax effects were computed using the enacted federal corporate tax rate of 21% and 35%, respectively, with the exception of unrealized gains and losses on available-for-sale securities held at our U.K. and Cayman Islands entities which in both periods were immaterial in amount.

35

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Amounts reclassified from AOCI to net income and the amounts of deferred tax expense (benefit) included in OCI were as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Reclassifications from AOCI to net income:
Realized investment gains (losses)	$	2,417		$	1,616
Tax effect*	(508		)	(566		)
Net reclassification adjustments	$	1,909		$	1,050
Deferred tax expense (benefit) included in OCI	$	(7,060	)	$	1,481
* Tax effects were computed using a 21% and 35% rate for the three months ended March 31, 2018 and 2017, respectively.

10. Variable Interest Entities

ProAssurance holds passive interests in a number of entities that are considered to be VIEs under GAAP guidance. ProAssurance's VIE interests principally consist of interests in LPs/LLCs formed for the purpose of achieving diversified equity and debt returns. At March 31, 2018, ProAssurance's VIE interests totaled $316.3 million carried as a part of investment in unconsolidated subsidiaries.

ProAssurance does not have power over the activities that most significantly impact the economic performance of these VIEs and thus is not the primary beneficiary. Therefore, ProAssurance has not consolidated these VIEs. ProAssurance’s involvement with each VIE is limited to its direct ownership interest in the VIE. Except for the funding commitments disclosed in Note 6, ProAssurance has no arrangements with any of the VIEs to provide other financial support to or on behalf of the VIE. At March 31, 2018, ProAssurance’s maximum loss exposure relative to these investments was limited to the carrying value of ProAssurance’s investment in the VIE.

36

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

11. Earnings Per Share

Diluted weighted average shares is calculated as basic weighted average shares plus the effect, calculated using the treasury stock method, of assuming that restricted share units, performance share units and purchase match units have vested. The following table provides the weighted average number of common shares outstanding used in the calculation of the Company's basic and diluted earnings per share:

(In thousands, except per share data)	Three Months Ended March 31
	2018		2017
Weighted average number of common shares outstanding, basic	53,515		53,315
Dilutive effect of securities:
Restricted Share Units	82		78
Performance Share Units	66		121
Purchase Match Units	19		21
Weighted average number of common shares outstanding, diluted	53,682		53,535
Effect of dilutive shares on earnings per share	$	—	$	(0.01	)

All dilutive common share equivalents are reflected in the earnings per share calculation while antidilutive common share equivalents are not reflected in the earnings per share calculation. There were no common share equivalents that were antidilutive for the three months endedMarch 31, 2018 or 2017.

37

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

12. Segment Information

ProAssurance operates in four segments that are organized around the nature of the products and services provided: Specialty P&C, Workers' Compensation, Lloyd's Syndicate and Corporate. A description of each segment follows.

Specialty P&C is primarily focused on professional liability insurance and medical technology liability insurance. Professional liability insurance is primarily offered to healthcare providers and institutions and to attorneys and their firms. Medical technology liability insurance is offered to medical technology and life sciences companies that manufacture or distribute products including entities conducting human clinical trials. Prior to 2018, the Specialty P&C segment ceded certain premium to the Lloyd's Syndicate segment under a quota share agreement with Syndicate 1729; however, this agreement was not renewed on January 1, 2018. As discussed below, the Lloyd's Syndicate segment results are typically reported on a quarter delay. For consistency purposes, results from this ceding arrangement, other than cash receipts or disbursements, have been reported within the Specialty P&C segment on the same one-quarter delay.

Workers' Compensation provides workers' compensation products primarily to employers with 1,000 or fewer employees. The segment also offers alternative market solutions whereby policies written are 100% ceded either to captive insurers unaffiliated with ProAssurance or to SPCs operated by wholly owned subsidiaries of ProAssurance. Each SPC is owned, fully or in part, by an agency, group or association. Operating results (underwriting profit or loss, plus investment results reported in the Corporate segment) of the SPCs are due to the owners of that cell.

During the first quarter of 2018, ProAssurance reorganized its Cayman Islands SPC operations. Beginning in 2018, all new and renewing alternative market business previously ceded to the SPCs at Eastern Re, with the exception of one program, is now ceded to SPCs operated by a newly formed wholly owned Cayman Islands subsidiary, Inova Re. As part of the reorganization, all SPCs previously operated by Eastern Re, with the exception of one program, ceased assuming new and renewing business on or after January 1, 2018. The external cell owners' cumulative undistributed earnings and the results of all SPCs for the current period due to external cell owners continue to be reported as SPC dividends payable and SPC dividend expense, respectively.

Lloyd'sSyndicate includes operating results from ProAssurance's 58% participation in Lloyd's of London Syndicate 1729. Syndicate 1729 underwrites risks over a wide range of property and casualty insurance and reinsurance lines in both the U.S. and international markets. The results of this segment are reported on a quarter delay, except when information is available that is material to the current period. Furthermore, investment results associated with the majority of investment assets solely allocated to Lloyd's Syndicate operations and certain U.S. paid administrative expenses are reported concurrently as that information is available on an earlier time frame. Beginning in 2018, ProAssurance increased its participation in the operating results of Syndicate 1729 from 58% to 62% and began its 100% participation in the operating results of Syndicate 6131 effective January 1, 2018; however, due to the quarter delay these changes will not be reflected in the Lloyd's Syndicate segment results until the second quarter of 2018. Syndicate 6131, a newly formed SPA, focuses on contingency and specialty property business.

Corporate includes ProAssurance's investment operations, interest expense and U.S. income taxes, all of which are managed at the corporate level with the exception of investment assets solely allocated to Lloyd's Syndicate operations as discussed above. The segment also includes non-premium revenues generated outside of the Company's insurance entities and corporate expenses.

The accounting policies of the segments are the same as those described in Note 1 of the Notes to Consolidated Financial Statements in ProAssurance’s December 31, 2017 report on Form 10-K and Note 1 of the Notes to Condensed Consolidated Financial Statements. ProAssurance evaluates performance of its Specialty P&C and Workers' Compensation segments based on before tax underwriting profit or loss, which excludes investment performance. Performance of the Lloyd's Syndicate segment is evaluated based on underwriting profit or loss, plus investment results of investment assets solely allocated to Lloyd's Syndicate operations, net of U.K. income tax expense. Performance of the Corporate segment is evaluated based on the contribution made to consolidated after-tax results. ProAssurance accounts for inter-segment transactions as if the transactions were to third parties at current market prices. Assets are not allocated to segments because investments and other assets are not managed at the segment level.

38

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

Financial results by segment were as follows:

	Three Months Ended March 31, 2018
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	116,276		$	58,407		$	12,476		$	—		$	—		$	187,159
Net investment income	—			—			751			21,276			—			22,027
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,640			—			1,640
Net realized gains (losses)	—			—			(54		)	(12,463		)	—			(12,517		)
Other income (expense)	1,256			366			331			943			(173		)	2,723
Net losses and loss adjustment expenses	(84,585		)	(36,715		)	(8,486		)	—			—			(129,786		)
Underwriting, policy acquisition and operating expenses	(28,276		)	(17,333		)	(7,246		)	(4,678		)	173			(57,360		)
Segregated portfolio cells dividend (expense) income	30			(1,894		)	—			117			—			(1,747		)
Interest expense	—			—			—			(3,705		)	—			(3,705		)
Income tax benefit (expense)	—			—			(6		)	3,428			—			3,422
Segment operating results	$	4,701		$	2,831		$	(2,234	)	$	6,558		$	—		$	11,856
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,867		$	956		$	(1	)	$	3,257		$	—		$	6,079

	Three Months Ended March 31, 2017
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	113,058		$	55,283		$	14,562		$	—		$	—		$	182,903
Net investment income	—			—			372			22,814			—			23,186
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,808			—			1,808
Net realized gains (losses)	—			—			27			13,253			—			13,280
Other income (expense)	1,198			145			391			173			(86		)	1,821
Net losses and loss adjustment expenses	(74,994		)	(34,650		)	(9,507		)	—			—			(119,151		)
Underwriting, policy acquisition and operating expenses	(25,977		)	(16,691		)	(6,211		)	(8,315		)	86			(57,108		)
Segregated portfolio cells dividend (expense) income	28			(1,174		)	—			(1,229		)	—			(2,375		)
Interest expense	—			—			—			(4,133		)	—			(4,133		)
Income tax benefit (expense)	—			—			7			1,217			—			1,224
Segment operating results	$	13,313		$	2,913		$	(359	)	$	25,588		$	—		$	41,455
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,911		$	837		$	(3	)	$	5,058		$	—		$	7,803

39

ProAssurance Corporation and Subsidiaries

Notes to Condensed Consolidated Financial Statements (Unaudited)

March 31, 2018

The following table provides detailed information regarding ProAssurance's gross premiums earned by product as well as a reconciliation to net premiums earned. All gross premiums earned are from external customers except as noted. ProAssurance's insured risks are primarily within the U.S.

	Three Months Ended March 31
(In thousands)	2018			2017
Specialty P&C Segment
Gross premiums earned:
Healthcare professional liability	$	118,685		$	117,051
Legal professional liability	6,391			6,317
Medical technology liability	8,512			8,312
Other	110			102
Ceded premiums earned	(17,422		)	(18,724		)
Segment net premiums earned	116,276			113,058
Workers' Compensation Segment
Gross premiums earned:
Traditional business	46,030			41,768
Alternative market business	19,381			19,446
Ceded premiums earned	(7,004		)	(5,931		)
Segment net premiums earned	58,407			55,283
Lloyd's Syndicate Segment
Gross premiums earned:
Property and casualty*	17,967			17,185
Ceded premiums earned	(5,491		)	(2,623		)
Segment net premiums earned	12,476			14,562
Consolidated net premiums earned	$	187,159		$	182,903

*Includes premium assumed from the Specialty P&C segment of $1.9 million for the three months endedMarch 31, 2018 and $3.5 million for the same respective period of 2017.

40

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

The following discussion should be read in conjunction with the Condensed Consolidated Financial Statements and Notes to those statements which accompany this report. Throughout the discussion we use certain terms and abbreviations, which can be found in the Glossary of Terms and Acronyms at the beginning of this report. In addition, a glossary of insurance terms and phrases is available on the investor section of our website. Throughout the discussion, references to "ProAssurance," "PRA," "Company," "we," "us" and "our" refer to ProAssurance Corporation and its consolidated subsidiaries. The discussion contains certain forward-looking information that involves significant risks, assumptions and uncertainties. As discussed under the heading "Caution Regarding Forward-Looking Statements," our actual financial condition and operating results could differ significantly from these forward-looking statements.

ProAssurance Overview

We report our results in four segments based on the operational focus of the segment. Our Specialty P&C segment includes our professional liability business and our medical technology liability business. Our Workers' Compensation segment includes workers' compensation insurance for employers, groups and associations. For the three months endedMarch 31, 2018 our Lloyd's Syndicate segment reflects operating results from our 58% participation in Syndicate 1729, which underwrites risks over a wide range of property and casualty insurance and reinsurance lines in both the U.S. and international markets. Information regarding Lloyd's operations derived from U.K. based entities is normally reported on a quarter delay, except when information is available that is material to the current period. Investment results associated with our FAL investments and certain U.S. paid administrative expenses are reported concurrently as that information is available on an earlier time frame. We increased our participation in the operating results of Syndicate 1729 from 58% to 62% and began our 100% participation in the operating results of Syndicate 6131 effective January 1, 2018; however, due to the quarter delay these changes will not be reflected in our Lloyd's Syndicate segment results until the second quarter of 2018. Syndicate 6131, a newly formed SPA, focuses on contingency and specialty property business. Our Corporate segment includes our investment operations, which are managed at the corporate level, except results associated with investment assets solely allocated to Lloyd's Syndicate operations, non-premium revenues generated outside of our insurance entities, corporate expenses, interest expense and U.S. income taxes. Additional information regarding our segments is included in Note 12 of the Notes to Condensed Consolidated Financial Statements and in Part I of our 2017 Form 10-K.

Critical Accounting Estimates

Our Condensed Consolidated Financial Statements are prepared in conformity with GAAP. Preparation of these financial statements requires us to make estimates and assumptions that affect the amounts we report on those statements. We evaluate these estimates and assumptions on an ongoing basis based on current and historical developments, market conditions, industry trends and other information that we believe to be reasonable under the circumstances. There can be no assurance that actual results will conform to our estimates and assumptions; reported results of operations may be materially affected by changes in these estimates and assumptions.

Management considers the following accounting estimates to be critical because they involve significant judgment by management and those judgments could result in a material effect on our financial statements.

Reserve for Losses and Loss Adjustment Expenses

The largest component of our liabilities is our reserve for losses and loss adjustment expenses ("reserve for losses" or "reserve"), and the largest component of expense for our operations is incurred losses and loss adjustment expenses (also referred to as “losses and loss adjustment expenses,” “incurred losses,” “losses incurred” and “losses”). Incurred losses reported in any period reflect our estimate of losses incurred related to the premiums earned in that period as well as any changes to our previous estimate of the reserve required for prior periods.

As of March 31, 2018, our reserve is comprised almost entirely of long-tail exposures. The estimation of long-tailed losses is inherently difficult and is subject to significant judgment on the part of management. Due to the nature of our claims, our loss costs, even for claims with similar characteristics, can vary significantly depending upon many factors, including but not limited to the specific characteristics of the claim and the manner in which the claim is resolved. Long-tailed insurance is characterized by the extended period of time typically required to assess the viability of a claim, potential damages, if any, and to then reach a resolution of the claim. The claims resolution process may extend to more than five years. The combination of continually changing conditions and the extended time required for claim resolution results in a loss cost estimation process that requires actuarial skill and the application of significant judgment, and such estimates require periodic modification.

Our reserve is established by management after taking into consideration a variety of factors including premium rates, claims frequency and severity, historical paid and incurred loss development trends, the expected effect of inflation, general

41

economic trends, the legal and political environment and the conclusions reached by our internal and consulting actuaries. We update and review the data underlying the estimation of our reserve for losses each reporting period and make adjustments to loss estimation assumptions that we believe best reflect emerging data. Both our internal and consulting actuaries perform an in-depth review of our reserve for losses on at least a semi-annual basis using the loss and exposure data of our insurance subsidiaries.

Our reserving process can be broadly grouped into three areas: the establishment of the reserve for the current accident year (the initial reserve), the re-estimation of the reserve for prior accident years (development of prior accident years) and the establishment of the initial reserve for risks assumed in business combinations, applicable only in periods in which acquisitions occur (the acquired reserve).

Current Accident Year - Initial Reserve

Considerable judgment is required in establishing our initial reserve for any current accident year period, as there is limited data available upon which to base our estimate. Our process for setting an initial reserve considers the unique characteristics of each product, but in general we rely heavily on the loss assumptions that were used to price business, as our pricing reflects our analysis of loss costs that we expect to incur relative to the insurance product being priced.

Specialty P&C Segment. Loss costs within this segment are impacted by many factors, including but not limited to the nature of the claim, including whether or not the claim is an individual or a mass tort claim, the personal situation of the claimant or the claimant's family, the outcome of jury trials, the legislative and judicial climate where any potential litigation may occur, general economic conditions and, for claims involving bodily injury, the trend of healthcare costs. Within our Specialty P&C segment, for our HCPL business (74% of our consolidated gross reserve for losses and loss adjustment expenses as of December 31, 2017), we set an initial reserve using the average loss ratio used in our pricing, plus an additional provision in consideration of the historical loss volatility we and others in the industry have experienced. For our HCPL business our target loss ratio during recent accident years has ranged from 77% to 80% and the provision for loss volatility has ranged from 8 to 10 percentage points, producing an overall average initial loss ratio for our HCPL business of approximately 90%. Changes in observed claim frequency and/or severity can result in variations from these levels. The reasons for the variability in loss provisions from period to period have included additional loss activity within our excess and surplus lines business, provisions for losses in excess of policy limits, adjustments to unallocated loss adjustment expenses, adjustment to the reserve for the death, disability and retirement provisions in our policies and additional losses recorded for particular exposures, such as mass torts. These specific adjustments are made if we believe the results for a given accident year are likely to exceed those anticipated by our pricing. We believe use of a provision for volatility appropriately considers the inherent risks and limitations of our rate development process and the historic volatility of professional liability losses (the industry has experienced accident year loss ratios as high as 138% and as low as 54% over the past 30 years) and produces a reasonable best estimate of the reserve required to cover actual ultimate unpaid losses. A similar practice is followed for our legal professional liability business (3% of our consolidated gross reserve for losses and loss adjustment expenses as of December 31, 2017).

The risks insured in our medical technology liability business (5% of our consolidated gross reserve for losses and loss adjustment expenses as of December 31, 2017) are more varied, and policies are individually priced based on the risk characteristics of the policy and the account. The insured risks range from startup operations to large multinational entities and the larger entities often have significant deductibles or self-insured retentions. Reserves are established using our most recently developed actuarial estimates of losses expected to be incurred based on factors which include results from prior analysis of similar business, industry indications, observed trends and judgment. Claims in this line of business primarily involve bodily injury to individuals and are affected by factors similar to those of our HCPL line of business. For the medical technology liability business, we also establish an initial reserve using a loss ratio approach, including a provision in consideration of historical loss volatility that this line of business has exhibited.

Workers' Compensation Segment. Many factors affect the ultimate losses incurred for our workers' compensation coverages (14% of our consolidated gross reserve for losses and loss adjustment expenses as of December 31, 2017) including but not limited to the type and severity of the injury, the age and occupation of the injured worker, the estimated length of disability, medical treatment and related costs, and the jurisdiction and workers' compensation laws of the injury occurrence. We use various actuarial methodologies in developing our workers’ compensation reserve, combined with a review of the exposure base generally based upon payroll of the insured. For the current accident year, given the lack of seasoned information, the different actuarial methodologies produce results with significant variability; therefore, more emphasis is placed on supplementing results from the actuarial methodologies with trends in exposure base, medical expense inflation, general inflation, severity, and claim counts, among other things, to select an expected loss ratio.

Lloyd's Syndicate Segment. Due to the relatively short history of Syndicate 1729 (January 1, 2014) we are influenced by historical claims experience of the Lloyd's market for similar risks in estimating the appropriate initial reserves for our Lloyd's Syndicate segment (4% of our consolidated gross reserve for losses and loss adjustment expenses as of December 31, 2017). We expect loss ratios to fluctuate from quarter to quarter as Syndicate 1729 writes more business and the book begins to

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mature. Loss ratios can also fluctuate due to the timing of earned premium adjustments. Such adjustments may be the result of premiums for certain policies and assumed reinsurance contracts being reported subsequent to the coverage period and may be subject to adjustment based on loss experience. Premium and exposure for some of Syndicate 1729's insurance policies and reinsurance contracts are initially estimated and subsequently recorded over an extended period of time as reports are received under binding authority programs. When reports are received, the premium, exposure and corresponding loss estimates are revised accordingly. Changes in loss estimates due to premium or exposure fluctuations are incurred in the accident year in which the premium is earned.

For significant property catastrophe exposures, Syndicate 1729 uses third-party catastrophe models to accumulate a listing of potentially affected policies. Each identified policy is given an estimate of loss severity based upon a combination of factors including the probable maximum loss of each policy, market share analytics, underwriting judgment, client/broker estimates and historical loss trends for similar events. These models are inherently uncertain, reliant upon key assumptions and management judgment and are not always a representation of actual events and ensuing potential loss exposure. Determination of actual losses may take an extended period of time until claims are reported and resolved, including coverage litigation.

Syndicate 6131, which began active operations effective January 1, 2018, follows a process similar to Syndicate 1729 for the establishment of initial reserves. Loss assumptions by risk category incorporated into the 2018 business plan submitted to Lloyd's were influenced by historical claims experience of the Lloyd's market for similar risks. We expect the loss ratios of Syndicate 6131 to fluctuate from quarter to quarter as Syndicate 6131 assumes more business from Syndicate 1729 and the book begins to mature.

Development of Prior Accident Years

In addition to setting the initial reserve for the current accident year, each period we reassess the amount of reserve required for prior accident years.

The foundation of our reserve re-estimation process is an actuarial analysis based on our most recently available claims data and currently available industry trend information. Changes to previously established reserve estimates are recognized in the current period if management’s best estimate of ultimate losses differs from the estimate previously established. While management considers a variety of variables in determining its best estimate, in general, as claims age, our methodologies give more weight to actual loss costs which, for the majority of our reserves, continue to indicate that ultimate loss costs will be lower than our previous estimates. The discussion in our Critical Accounting Estimates section in Item 7 of our 2017 Form 10-K includes additional information regarding the methodologies used to evaluate our reserve.

Any change in our estimate of net ultimate losses for prior years is reflected in net income in the period in which such changes are made. In recent years such changes have reduced our estimate of net ultimate losses, resulting in a reduction of reported losses for the period and a corresponding increase in pre-tax income.

Due to the size of our consolidated reserve for losses and the large number of claims outstanding at any point in time, even a small percentage adjustment to our total reserve estimate could have a material effect on our results of operations for the period in which the adjustment is made.

Use of Judgment

Even though the actuarial process is highly technical, it is also highly judgmental, both as to the selection of the data used in the various actuarial methodologies (e.g., initial expected loss ratios and loss development factors) and in the interpretation of the output of the various methods used. Each actuarial method generally returns a different value and for the more recent accident years the variations among the various methodologies can be significant. For each partition of our reserves, we evaluate the results of the various methods, along with the supplementary statistical data regarding such factors as closed with and without indemnity ratios, claim severity trends, the expected duration of such trends, changes in the legal and legislative environment and the current economic environment to develop a point estimate based upon management's judgment and past experience. The series of selected point estimates is then combined to produce an overall point estimate for ultimate losses.

Given the potential for unanticipated volatility for long-tailed lines of business, we are cautious in giving full credibility to emerging trends that, when more fully mature, may lead to the recognition of either favorable or adverse development of our losses. There may be trends, both positive and negative, reflected in the numerical data both within our own information and in the broader marketplace that mitigate or reverse as time progresses and additional data becomes available. This is particularly true for our HCPL business which has historically exhibited significant volatility as previously discussed.

HCPL. Over the past several years the most influential factor affecting the analysis of our HCPL reserves and the related development recognized has been the change, or lack thereof, in the severity of claims. The severity trend is an explicit component of our pricing models, whereas in our reserving process the severity trend's impact is implicit. Our estimate of this trend and our expectations about changes in this trend impact a variety of factors, from the selection of expected loss ratios to the ultimate point estimates established by management.

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Because of the implicit and wide-ranging nature of severity trend assumptions on the loss reserving process it is not practical to specifically isolate the impact of changing severity trends. However, because severity is an explicit component of our HCPL pricing process we can better isolate the impact that changing severity can have on our loss costs and loss ratios in regards to our pricing models for this business component. Our current HCPL pricing models assume a severity trend of 2% to 3% in most states and products. We have observed potentially higher severity trends in our case reserve estimates but these have not been confirmed by actual claim payments. If the severity trend were to be higher by 1 percentage point, the impact would be an increase in our expected loss ratio for this business of 3.2 percentage points, based on current claim disposition patterns. An increase in the severity trend of 3 percentage points would result in a 10.1 percentage point increase in our expected loss ratio. Due to the long-tailed nature of our claims and the previously discussed historical volatility of loss costs, selection of a severity trend assumption is a subjective process that is inherently likely to prove inaccurate over time. Given the long tail and volatility, we are generally cautious in making changes to the severity assumptions within our pricing models. All open claims and accident years are generally impacted by a change in the severity trend, which compounds the effect of such a change. Based on the weighted average of payments, typically 91% of our HCPL claims are resolved after eight years for a given accident year.

Although we remain uncertain regarding the ultimate severity trend to project into the future due to the long-tailed nature of our business, we have given consideration to observed loss costs in setting our rates. For our HCPL business this practice has generally resulted in rate reductions in recent years as claim frequency declined and remained at historically low levels. For example, on average, excluding our podiatry business acquired in 2009, we have gradually reduced the premium rates we charge on our standard physician renewal business (our largest HCPL line) by approximately 17% from the beginning of 2006 to December 31, 2016. During 2017, the average charged rates on our standard physician renewal business increased by 1% and we anticipate further gradual rate increases due to increasing loss severity. Loss ratios for recent accident years have thus remained fairly constant because expected loss changes have been reflected in our rates; however, we have recognized a higher current accident year net loss ratio for the three months endedMarch 31, 2018 due to those recent severity indications.

Workers' Compensation. The projection of changes in claim severity trend has not historically been an influential factor affecting our workers' compensation analysis of reserves, as claims are typically resolved more quickly than the industry norm. As previously mentioned, the determination and calculation of loss development factors, in particular, the selection of tail factors which are used to extend the projection of losses beyond historical data, requires considerable judgment.

Loss Development

We recognized net favorable reserve development of $22.8 million during the three months endedMarch 31, 2018, of which favorable development of $20.6 million related to our Specialty P&C segment, $1.9 million related to our Workers' Compensation segment and $0.3 million related to our Lloyd's Syndicate segment.

Net favorable development recognized within the Specialty P&C segment was primarily attributable to the favorable resolution of HCPL claims during the period and an evaluation of established case reserves and paid claims data that indicated that the average severity trend associated with the remaining HCPL claims is less than we had previously estimated.

Net favorable development recognized within the Workers' Compensation segment included amortization of the purchase accounting fair value adjustment within the traditional business of $0.4 million for the three months endedMarch 31, 2018; the remaining net favorable development of $1.5 million for the three months endedMarch 31, 2018 was attributable to our SPCs which are evaluated at the cell level. Because a relatively small number of claims are open per cell, the closing of claims can affect the actuarial projections for the remaining open claims in the cell to an extent that indicates development should be recognized for the cell.

Net favorable development recognized within our Lloyd's Syndicate segment for the three months endedMarch 31, 2018 was attributable to actual loss experience proving to have been better than the Lloyd's market historical averages for similar risks which were used to establish initial reserves. See further discussion in our Segment Operating Results - Lloyd's Syndicate section that follows.

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Investment Valuations

We record the majority of our investments at fair value as shown in the table below. At March 31, 2018 the distribution of our investments based on GAAP fair value hierarchies (levels) was as follows:

	Distribution by GAAP Fair Value Hierarchy
	Level 1	Level 2	Level 3	Not Categorized	Total Investments
Investments recorded at:
Fair value	22%	63%	1%	9%	95%
Other valuations					5%
Total Investments					100%

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. All of our fixed maturity and equity investments are carried at fair value. Our short-term securities are carried at amortized cost, which approximates fair value.

Because of the number of securities we own and the complexity of developing accurate fair values, we utilize multiple independent pricing services to assist us in establishing the fair value of individual securities. The pricing services provide fair values based on exchange-traded prices, if available. If an exchange-traded price is not available, the pricing services, if possible, provide a fair value that is based on multiple broker/dealer quotes or that has been developed using pricing models. Pricing models vary by asset class and utilize currently available market data for securities comparable to ours to estimate a fair value for our securities. The pricing services scrutinize market data for consistency with other relevant market information before including the data in the pricing models. The pricing services disclose the types of pricing models used and the inputs used for each asset class. Determining fair values using these pricing models requires the use of judgment to identify appropriate comparable securities and to choose a valuation methodology that is appropriate for the asset class and available data.

The pricing services provide a single value per instrument quoted. We review the values provided for reasonableness each quarter by comparing market yields generated by the supplied value versus market yields observed in the marketplace. We also compare yields indicated by the provided values to appropriate benchmark yields and review for values that are unchanged or that reflect an unanticipated variation as compared to prior period values. We utilize a primary pricing service for each security type and compare provided information for consistency with alternate pricing services, known market data and information from our own trades, considering both values and valuation trends. We also review weekly trades versus the prices supplied by the services. If a supplied value appears unreasonable, we discuss the valuation in question with the pricing service and make adjustments if deemed necessary. Historically our review has not resulted in any material changes to the values supplied by the pricing services. The pricing services do not provide a fair value unless an exchange-traded price or multiple observable inputs are available. As a result, the pricing services may provide a fair value for a security in some periods but not others, depending upon the level of recent market activity for the security or comparable securities.

Level 1 Investments

Fair values for a majority of our equity securities and portions of our corporate debt, short-term and convertible securities are determined using exchange-traded prices. There is little judgment involved when fair value is determined using an exchange-traded price. In accordance with GAAP, for disclosure purposes we classify securities valued using an exchange-traded price as Level 1 securities.

Level 2 Investments

Most fixed income securities do not trade daily; and thus, exchange-traded prices are generally not available for these securities. However, market information (often referred to as observable inputs or market data, including but not limited to, last reported trade, non-binding broker quotes, bids, benchmark yield curves, issuer spreads, two sided markets, benchmark securities, offers and recent data regarding assumed prepayment speeds, cash flow and loan performance data) is available for most of our fixed income securities. We determine fair value for a large portion of our fixed income securities using available market information. In accordance with GAAP, for disclosure purposes we classify securities valued based on multiple market observable inputs as Level 2 securities.

Level 3 Investments

When a pricing service does not provide a value for one of our fixed maturity securities, management estimates fair value using either a single non-binding broker quote or pricing models that utilize market based assumptions which have limited observable inputs. The process involves significant judgment in selecting the appropriate data and modeling techniques to use

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in the valuation process. For disclosure purposes, we classify securities valued using limited observable inputs as Level 3 securities.

Fair Values Not Categorized

We hold interests in certain investment funds, primarily LPs/LLCs, which measure fund assets at fair value on a recurring basis and provide us with a NAV for our interest. As a practical expedient, we consider the NAV provided to approximate the fair value of the interest. In accordance with GAAP, we do not categorize these investments within the fair value hierarchy.

Nonrecurring Fair Value Measurements

We measure the fair value of certain assets on a nonrecurring basis when events or changes in circumstances indicate that the carrying amount of the asset may not be recoverable. These assets include investments carried at principally cost, investments in tax credit partnerships and equity method investments that do not provide a NAV, fixed assets, goodwill and other intangible assets.

Investments - Other Valuation Methodologies

Certain of our investments, in accordance with GAAP for the type of investment, are measured using methodologies other than fair value. At March 31, 2018, these investments represented approximately 5% of total investments, and are detailed in the following table. Additional information about these investments is provided in Notes 2 and 3 of the Notes to Condensed Consolidated Financial Statements.

(In millions)	Carrying Value		GAAP Measurement Method
Other investments:
Other, principally FHLB capital stock	$	2.9	Principally Cost
Investment in unconsolidated subsidiaries:
Investments in tax credit partnerships	86.2		Equity
Equity method investments, primarily LPs/LLCs	37.7		Equity
	123.9
BOLI	62.6		Cash surrender value
Total investments - Other valuation methodologies	$	189.4

Other-than-temporary Impairments

We evaluate our available-for-sale investment securities on at least a quarterly basis for the purpose of determining whether declines in fair value below recorded cost basis represent OTTI. We consider an OTTI to have occurred:

• if there is intent to sell the security;

• if it is more likely than not that the security will be required to be sold before full recovery of its amortized cost basis; and

• if the entire amortized basis of the security is not expected to be recovered.

The assessment of whether the amortized cost basis of a security, particularly an asset-backed debt security, is expected to be recovered requires management to make assumptions regarding various matters affecting future cash flows. The choice of assumptions is subjective and requires the use of judgment. Actual credit losses experienced in future periods may differ from management’s estimates of those credit losses. Methodologies used to estimate the present value of expected cash flows are:

For non-structured fixed maturities (obligations of states, municipalities and political subdivisions and corporate debt) the estimate of expected cash flows is determined by projecting a recovery value and a recovery time frame and assessing whether further principal and interest will be received. We consider various factors in projecting recovery values and recovery time frames, including the following:

• third-party research and credit rating reports;

• the current credit standing of the issuer, including credit rating downgrades, whether before or after the balance sheet date;

• the extent to which the decline in fair value is attributable to credit risk specifically associated with the security or its issuer;

• internal assessments and the assessments of external portfolio managers regarding specific circumstances surrounding an investment, which indicate the investment is more or less likely to recover its amortized cost than other investments with a similar structure;

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• for asset-backed securities, the origination date of the underlying loans, the remaining average life, the probability that credit performance of the underlying loans will deteriorate in the future, and our assessment of the quality of the collateral underlying the loan;

• failure of the issuer of the security to make scheduled interest or principal payments;

• any changes to the rating of the security by a rating agency; and

• recoveries or additional declines in fair value subsequent to the balance sheet date.

For structured securities (primarily asset-backed securities), management estimates the present value of the security’s cash flows using the effective yield of the security at the date of acquisition (or the most recent implied rate used to accrete the security if the implied rate has changed as a result of a previous impairment or changes in expected cash flows). We consider the most recently available six month averages of the levels of delinquencies, defaults, severities, and prepayments for the collateral (loans) underlying the securitization or, if historical data is not available, sector based assumptions, to estimate expected future cash flows of these securities.

Exclusive of securities where there is an intent to sell or where it is not more likely than not that the security will be required to be sold before recovery of its amortized cost basis, OTTI for debt securities is separated into a credit component and a non-credit component. The credit component of an OTTI is the difference between the security’s amortized cost basis and the present value of its expected future cash flows, while the non-credit component is the remaining difference between the security’s fair value and the present value of expected future cash flows. The credit component of the OTTI is recognized in earnings while the non-credit component is recognized in OCI.

Investments in tax credit partnerships are evaluated for OTTI by considering both qualitative and quantitative factors which include: whether the current expected cash flows from the investment, primarily tax benefits, are less than those expected at the time the investment was acquired due to various factors, such as a change in the statutory tax rate, and our ability and intent to hold the investment until the recovery of its carrying value.

Investments which are accounted for under the equity method are evaluated for impairment whenever events or changes in circumstances indicate that the carrying value of the investment might not be recoverable. These circumstances include, but are not limited to, evidence of the inability to recover the carrying value of the investment, the inability of the investee to sustain an earnings capacity that would justify the carrying value of the investment or the current fair value of the investment that is less than the carrying value.

We recognize OTTI, exclusive of non-credit OTTI, in earnings as a part of net realized investment gains (losses). In subsequent periods, any measurement of gain, loss or impairment is based on the revised amortized basis of the security. Non-credit OTTI on debt securities and declines in fair value of available-for-sale securities not considered to be other-than-temporary are recognized in OCI.

Asset-backed debt securities that have been impaired due to credit reasons or are below investment grade quality are accounted for under the effective yield method. Under the effective yield method, estimates of cash flows expected over the life of asset-backed securities are then used to recognize income on the investment balance for subsequent accounting periods.

Deferred Policy Acquisition Costs

Policy acquisition costs (primarily commissions, premium taxes and underwriting salaries) which are directly related to the successful acquisition of new and renewal premiums are capitalized as DPAC and charged to expense, net of ceding commissions earned, as the related premium revenue is recognized. We evaluate the recoverability of our DPAC at the segment level each reporting period, and any amounts estimated to be unrecoverable are charged to expense in the current period. As of March 31, 2018 we have not determined that any amounts are unrecoverable.

Estimation of Taxes / Tax Credits

For interim periods, we determine our provision (benefit) for income taxes based on our current estimate of our annual effective tax rate. Items which are unusual, infrequent, or that cannot be reliably estimated are considered in the effective tax rate in the period in which the item is included in income, and are referred to as discrete items. In calculating our estimated annual effective tax rate, we include the estimated benefit of tax credits for the annual period based on the most recently available information provided by the tax credit partnership; the actual amounts of credits provided by the tax credit partnerships may prove to be different than our estimates. The effect of such differences is recognized in the period identified.

Deferred Taxes

Deferred federal income taxes arise from the recognition of temporary differences between the basis of assets and liabilities determined for financial reporting purposes and the basis determined for income tax purposes. Our temporary differences principally relate to our loss reserve, unearned premiums, DPAC, unrealized investment gains (losses) and basis

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differences on fixed assets and investment assets. Deferred tax assets and liabilities are measured using the enacted tax rates expected to be in effect when such benefits are realized. We review our deferred tax assets quarterly for impairment. If we determine that it is more likely than not that some or all of a deferred tax asset will not be realized, a valuation allowance is recorded to reduce the carrying value of the asset. In assessing the need for a valuation allowance, management is required to make certain judgments and assumptions about our future operations based on historical experience and information as of the measurement period regarding reversal of existing temporary differences, carryback capacity, future taxable income (including its capital and operating characteristics) and tax planning strategies.

A valuation allowance has been established against the full value of the deferred tax asset related to the NOL carryforwards for the U.K. operations as management concluded that it was more likely than not that the deferred tax asset will not be realized. See further discussion in Note 5 of the Notes to Consolidated Financial Statements in our December 31, 2017 Form 10-K.

Tax Cuts and Jobs Act

The TCJA was signed into law on December 22, 2017 and contains several key provisions that impact our business, including the reduction of the corporate tax rate to 21% effective January 1, 2018, the reduction in the amount of executive compensation that could qualify as a tax deduction, a minimum tax on payments made to related foreign entities and a change in how property and casualty taxpayers discount loss reserves. See Note 4 of the Notes to Condensed Consolidated Financial Statements for discussion of the current status of our accounting for certain provisions of the TCJA.

Effective January 1, 2018, the TCJA introduced a minimum tax on payments made to related foreign entities referred to as the BEAT. The BEAT is imposed by adding back into the U.S. tax base any base erosion payment made by the U.S. taxpayer to a related foreign entity and applying a minimum tax rate to this newly calculated modified taxable income. Base erosion payments represent any amount paid or accrued by the U.S. taxpayer to a related foreign entity for which a deduction is allowed. Premiums we cede to the SPCs at our newly formed wholly owned Cayman Islands reinsurance subsidiary, Inova Re, do not fall within the scope of base erosion payments as the SPCs at Inova Re intend to elect to be taxed as U.S. taxpayers. However, premiums that we cede to any active SPC at our other wholly owned Cayman Islands reinsurance subsidiary, Eastern Re, fall within the scope of the base erosion payments and therefore could be significantly impacted by the BEAT. See further discussion on our new subsidiary, Inova Re, and our Cayman Islands SPC operations in the Segment Operating Results - Workers' Compensation section that follows. We have evaluated our exposure to the BEAT and have concluded that our outbound deductible payments to related foreign entities are below the threshold for application of the BEAT; therefore, we have not recognized any incremental tax expense for the BEAT for the three months endedMarch 31, 2018.

Unrecognized Tax Benefits

We evaluate tax positions taken on tax returns and recognize positions in our financial statements when it is more likely than not that we will sustain the position upon resolution with a taxing authority. If recognized, the benefit is measured as the largest amount of benefit that has a greater than 50% probability of being realized. We review uncertain tax positions each period, considering changes in facts and circumstances, such as changes in tax law, interactions with taxing authorities and developments in case law, and make adjustments as we consider necessary. Adjustments to our unrecognized tax benefits may affect our income tax expense, and settlement of uncertain tax positions may require the use of cash. Other than differences related to timing, no significant adjustments were considered necessary during the three months endedMarch 31, 2018 or 2017. At March 31, 2018, our liability for unrecognized tax benefits approximated $4.6 million.

Goodwill

We evaluate goodwill for impairment annually on October 1 and upon the occurrence of certain triggering events or substantive changes in circumstances that indicate the fair value of goodwill may be impaired. Impairment of goodwill is tested at the reporting unit level, which is consistent with the reportable segments identified in Note 12 of the Notes to Condensed Consolidated Financial Statements. Of the four reporting units, two have goodwill - Specialty P&C and Workers' Compensation. As of October 1, 2017, we performed a qualitative goodwill impairment assessment for both our Specialty P&C and Workers' Compensation segments. As of the most recent evaluation date, management concluded that it was not more likely than not that the fair values of each of the Specialty P&C and Workers' Compensation reporting units was less than their respective carrying values; therefore, no further impairment testing was required. There have been no events or changes in circumstances since that evaluation date that would indicate the carrying amount of goodwill is not recoverable. Additional information regarding our goodwill assessment at the reporting unit level is included in Note 1 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

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Intangibles

Intangible assets with definite lives are amortized over the estimated useful life of the asset. Amortizable intangible assets primarily consist of agency and policyholder relationships, renewal rights and trade names. Intangible assets with an indefinite life, primarily state licenses, are not amortized. Intangible assets are evaluated for impairment on an annual basis. Additional information regarding intangible assets is included in Note 1 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

Audit Premium

Workers’ compensation premiums are determined based upon the payroll of the insured, applicable premium rates and an experience-based modification factor, where applicable. An audit of the policyholders’ records is conducted after policy expiration to make a final determination of applicable premiums. Audit premium due from or due to a policyholder as a result of an audit is reflected in net premiums written and earned when billed. We track, by policy, the amount of additional premium billed in final audit invoices as a percentage of payroll exposure and use this information to estimate the probable additional amount of EBUB premium as of the balance sheet date. We include changes to the EBUB premium estimate in net premiums written and earned in the period recognized.

Lloyd’s Premium Estimates

For certain insurance policies and reinsurance contracts written in our Lloyd’s Syndicate segment, premiums are initially recognized based upon estimates of ultimate premium. Ultimate premium represents the total expected premium to be written under binder authority and certain assumed reinsurance agreements. These estimates of ultimate premium are judgmental and are dependent upon certain assumptions, including historical premium trends for similar agreements. As reports are received from programs, ultimate premium estimates are revised, if necessary, with changes reflected in current operations.

Accounting Changes

We did not adopt any accounting changes or have any change in accounting estimate or policy that had a material effect on our results of operations or financial position during the three months ended March 31, 2018. We are not aware of any accounting changes not yet adopted as of March 31, 2018 that would have a material effect on our results of operations or financial position. Note 1 of the Notes to Condensed Consolidated Financial Statements provides additional detail regarding accounting changes.

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Liquidity and Capital Resources and Financial Condition

Overview

ProAssurance Corporation is a holding company and is a legal entity separate and distinct from its subsidiaries. As a holding company our principal source of external revenue is our investment revenues. In addition, dividends from our operating subsidiaries represent a significant source of funds for our obligations, including debt service and shareholder dividends. At March 31, 2018, we held cash and liquid investments of approximately $103 million outside our insurance subsidiaries that were available for use without regulatory approval or other restriction. As of April 30, 2018, we also have an additional $120 million in permitted borrowings under our Revolving Credit Agreement, which includes $3 million of the balance outstanding at March 31, 2018 that was repaid in April 2018. Additionally, we have available an accordion feature which, if subscribed successfully, would allow another $50 million in available funds as discussed in this section under the heading "Debt."

Our operating subsidiaries did not pay us any dividends during the three months ended March 31, 2018. However, we anticipate that our operating subsidiaries will pay dividends to us of approximately $80 million in May 2018, which will include extraordinary dividends from our insurance subsidiaries of $48 million. Dividends to be paid in May have not been included in our cash and liquid investments held outside of our insurance subsidiaries at March 31, 2018. Excluding the dividends to be paid in May 2018, our insurance subsidiaries, in the aggregate, are permitted to pay additional dividends of approximately $99 million over the remainder of 2018 without prior approval of state insurance regulators. However, the payment of any dividend requires prior notice to the insurance regulator in the state of domicile, and the regulator may reduce or prevent the dividend if, in its judgment, payment of the dividend would have an adverse effect on the surplus of the insurance subsidiary. We make the decision to pay dividends from an insurance subsidiary based on the capital needs of that subsidiary, and may pay less than the permitted dividend or may also request permission to pay an additional amount (an extraordinary dividend).

Cash Flows

Cash flows between periods compare as follows:

	Three Months Ended March 31
(In thousands)	2018 vs 2017			2017 vs 2016
Increase (decrease) in net cash provided (used) by:
Operating activities	$	3,982		$	11,400
Investing activities	(39,574		)	218,506
Financing activities	(40,227		)	(201,547		)
Increase (decrease) in cash and cash equivalents	$	(75,819	)	$	28,359

The principal components of our operating cash flows are the excess of premiums collected and net investment income over losses paid and operating costs, including income taxes. Timing delays exist between the collection of premiums and the payment of losses associated with the premiums. Premiums are generally collected within the twelve-month period after the policy is written, while our claim payments are generally paid over a more extended period of time. Likewise, timing delays exist between the payment of claims and the collection of any associated reinsurance recoveries.

During the first quarter of 2018, we retrospectively adopted accounting guidance that resulted in a change in classification of distributions received from unconsolidated subsidiaries. Additional information regarding the impact of accounting guidance adopted during the current period can be found in Note 1 to the Notes to Condensed Consolidated Financial Statements.

The increase in operating cash flows for the three months endedMarch 31, 2018 as compared to three months endedMarch 31, 2017 was primarily due to an increase in premium receipts of $10.6 million, driven by our Workers' Compensation segment, and a decrease in cash paid for operating expenses of $2.8 million, driven by a decrease in share-based compensation expenses and other compensation related costs in our Corporate segment. These increases in operating cash flows were partially offset by an increase in paid losses of $6.5 million, driven by our Lloyd's Syndicate segment primarily due to losses related to 2017 Hurricanes Harvey, Irma and Maria, and a decrease in cash received from investment income of $2.3 million due to a decline in distributed earnings from our unconsolidated subsidiaries.

The increase in operating cash flows for the three months endedMarch 31, 2017 as compared to the three months endedMarch 31, 2016 was primarily due to a decrease in loss payments of $18.3 million, driven by our Specialty P&C segment, an increase in premium receipts of $11.5 million, driven by our Specialty P&C and Workers' Compensation segments, and an increase in cash received from investment income of $3.5 million. These increases in operating cash flows were largely offset by the effect of a $15.0 million tax refund received in 2016 for the 2015 tax year and an increase in cash paid for operating expenses of $6.3 million in the three months endedMarch 31, 2017 (no individually significant variances in expense categories).

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We manage our investing cash flows to ensure that we will have sufficient liquidity to meet our obligations, taking into consideration the timing of cash flows from our investments, including interest payments, dividends and principal payments, as well as the expected cash flows to be generated by our operations as discussed in this section under the heading "Investing Activities and Related Cash Flows."

Our financing cash flows are primarily composed of dividend payments and borrowings and repayments under our Revolving Credit Agreement. See further discussion of our financing activities in this section under "Financing Activities and Related Cash Flows."

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Operating Activities and Related Cash Flows

Reinsurance

Within our Specialty P&C segment, we use insurance and reinsurance (collectively, “reinsurance”) to provide capacity to write larger limits of liability, to provide reimbursement for losses incurred under the higher limit coverages we offer and to provide protection against losses in excess of policy limits. Within our Workers' Compensation segment, we use reinsurance to reduce our net liability on individual risks, to mitigate the effect of significant loss occurrences (including catastrophic events), to stabilize underwriting results, and to increase underwriting capacity by decreasing leverage. In both the Specialty P&C and Workers' Compensation segments, we use reinsurance in risk sharing arrangements to align our objectives with those of our strategic business partners and to provide custom insurance solutions for large customer groups. Prior to 2018, we had a quota share arrangement with Syndicate 1729 which was established to provide an initial premium base for Syndicate 1729 which was not renewed on January 1, 2018. The purchase of reinsurance does not relieve us from the ultimate risk on our policies; however, it does provide reimbursement for certain losses we pay. We pay our reinsurers a premium in exchange for reinsurance of the risk. In the majority of our excess of loss arrangements, the premium due to the reinsurer is determined by the loss experience of the business reinsured, subject to certain minimum and maximum amounts. Until all loss amounts are known, we estimate the premium due to the reinsurer. Changes to the estimate of premium owed under reinsurance agreements related to prior periods are recorded in the period in which the change in estimate occurs and can have a significant effect on net premiums earned.

We generally reinsure risks under treaties (our excess of loss reinsurance arrangements) pursuant to which the reinsurers agree to assume all or a portion of all risks that we insure above our individual risk retention levels, up to the maximum individual limits offered. These arrangements are negotiated and renewed annually. Renewal dates for our healthcare professional liability, medical technology liability and workers' compensation treaties are October 1, January 1 and May 1, respectively. There were no significant changes in the cost or structure of our professional liability and medical technology liability treaties which renewed October 1, 2017 and January 1, 2018, respectively. Our workers' compensation treaty renewed May 1, 2017 at a slightly higher rate than the previous agreement. The significant coverages provided by our current excess of loss reinsurance arrangements are detailed in the following table.

Excess of Loss Reinsurance Agreements

Healthcare Professional Liability Medical Technology & Life Sciences Products Workers' Compensation - Traditional

⁽¹⁾ Historically, retention has ranged from 5% to 32.5%.

⁽²⁾ Historically, retention has been as high as $2M.

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Large professional liability risks that are above the limits of our basic reinsurance treaties are reinsured on a facultative basis, whereby the reinsurer agrees to insure a particular risk up to a designated limit. We also have in place a number of risk sharing arrangements that apply to the first $1 million of losses for certain large healthcare systems and other insurance entities and with certain insurance agencies that produce business for us.

During the three months endedMarch 31, 2018, we wrote workers' compensation and healthcare professional liability policies in our alternative market business generating premium of approximately $32.4 million. These policies are reinsured to the SPCs of our wholly owned subsidiaries, Eastern Re and Inova Re, domiciled in the Cayman Islands, net of a ceding commission. See further discussion on our SPC operations at Eastern Re and Inova Re in the Segment Operating Results - Workers' Compensation section that follows. The alternative market workers' compensation policies are ceded to the SPCs under 100% quota share reinsurance agreements and then further reinsured under an aggregate excess of loss reinsurance arrangement. The alternative market professional liability policies are ceded to the SPCs under either excess of loss or quota share reinsurance agreements, depending on the structure of the individual program, and the portion of the risk that is not ceded to an SPC may also be reinsured under our standard healthcare professional liability reinsurance program depending on the policy limits provided. The remaining premium written in our alternative market business of $3.4 million for the three months endedMarch 31, 2018 is 100% ceded to unaffiliated captive insurers.

Each SPC has preferred shareholders or participants and the underwriting profit or loss of each cell accrues fully to these preferred shareholders or participants. We participate in certain SPCs and as of March 31, 2018, our ownership interest in the SPCs in which we participate is as low as 25% and as high as 85%.

As previously discussed, for the workers' compensation business ceded to Eastern Re and Inova Re, each SPC has in place its own reinsurance arrangements; which are illustrated in the following table.

Segregated Portfolio Cell Reinsurance

Per Occurrence Coverage Aggregate Coverage

⁽¹⁾ ProAssurance assumes 100% of aggregate losses in excess of an aggregate attachment point with a

maximum loss limit of $100K.

⁽²⁾ The attachment point is based on a percentage of premium (average is 89%) and varies by cell.

Each SPC maintains a loss fund initially equal to the difference between premium assumed by the cell and the ceding commission. The external owners of each cell provide a letter of credit to us that is initially equal to the difference between the loss fund of the SPC (amount of funds available to pay losses after deduction of ceding commission) and the aggregate attachment point of the reinsurance. Over time, a SPC's retained profits are considered in the determination of the collateral amount required to be provided by the cell's external owners.

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Within our Lloyd's Syndicate segment, Syndicate 1729 utilizes reinsurance to provide capacity to write larger limits of liability on individual risks, to provide protection against catastrophic loss and to provide protection against losses in excess of policy limits. The level of reinsurance that Syndicate 1729 purchases is dependent on a number of factors, including its underwriting risk appetite for catastrophic exposure, the specific risks inherent in each line or class of business written and the pricing, coverage and terms and conditions available from the reinsurance market. Reinsurance protection by line of business is as follows:

• Reinsurance is utilized on a per risk basis for the property insurance and casualty coverages in order to mitigate risk volatility.

• Catastrophic protection is utilized on both our property insurance and casualty coverages to protect against losses in excess of policy limits as well as natural catastrophes.

• Both quota share reinsurance and excess of loss reinsurance are utilized to manage the net loss exposure on our property reinsurance coverages.

• Property umbrella excess of loss reinsurance is utilized for peak catastrophe and frequency of catastrophe exposures.

• Beginning in 2018, external excess of loss reinsurance will be utilized by Syndicate 1729 to manage the net loss exposure on the specialty property and contingency coverages ceded to Syndicate 6131 (see further discussion in Segment Operating Results - Lloyd's Syndicate section that follows).

Syndicate 1729 may still be exposed to losses that exceed the level of reinsurance purchased as well as to reinstatement premiums triggered by losses exceeding specified levels. Cash demands on Syndicate 1729 can vary significantly depending on the nature and intensity of a loss event. For significant reinsured catastrophe losses, the inability or unwillingness of the reinsurer to make timely payments under the terms of the reinsurance agreement could have an adverse effect on Syndicate 1729's liquidity.

For all of our segments, we make a determination of the amount of insurance risk we choose to retain based upon numerous factors, including our risk tolerance and the capital we have to support it, the price and availability of reinsurance, the volume of business, our level of experience with a particular set of claims and our analysis of the potential underwriting results. We purchase excess of loss reinsurance to limit the amount of risk we retain and we do so from a number of companies to mitigate concentrations of credit risk. We utilize reinsurance brokers to assist us in the placement of these reinsurance programs and in the analysis of the credit quality of our reinsurers. The determination of which reinsurers we choose to do business with is based upon an evaluation of their then current financial strength, rating and stability. However, the financial strength of our reinsurers and their corresponding ability to pay us may change in the future due to forces or events we cannot control or anticipate.

Litigation

We are involved in various legal actions related to insurance policies and claims handling including, but not limited to, claims asserted against us by policyholders. These types of legal actions arise in the ordinary course of business and, in accordance with GAAP for insurance entities, are generally considered as a part of our loss reserving process, which is described in detail in our Critical Accounting Estimates section under the heading "Reserve for Losses and Loss Adjustment Expenses." We also have other direct actions against the Company unrelated to our claims activity which we evaluate and account for as a part of our other liabilities. For these corporate legal actions, we evaluate each case separately and establish what we believe is an appropriate reserve based on GAAP guidance related to contingent liabilities. As of March 31, 2018 there were no material reserves established for corporate legal actions.

Taxes

We are subject to the tax laws and regulations of the U.S. and U.K. We file a consolidated U.S. federal income tax return that includes the holding company and its U.S. subsidiaries. Our filing obligations include a requirement to make quarterly payments of estimated taxes to the IRS using the corporate tax rate effective for the tax year. As a result of the TCJA that was signed into law at the end of 2017, the corporate tax rate effective for the 2018 tax year is 21% as compared to 35% for the 2017 tax year; however, the lower corporate tax rate had no material effect on our liquidity for the three months endedMarch 31, 2018.

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Investing Activities and Related Cash Flows

Our investments at March 31, 2018 and December 31, 2017 are comprised as follows:

	March 31, 2018				December 31, 2017
($ in thousands)	Carrying Value		% of Total Investment		Carrying Value		% of Total Investment
Fixed maturities, available for sale
U.S. Treasury obligations	$	129,751	4	%	$	133,627	4	%
U.S. Government-sponsored enterprise obligations	29,959		1	%	20,956		1	%
State and municipal bonds	329,995		9	%	632,243		17	%
Corporate debt	1,248,263		36	%	1,167,158		31	%
Residential mortgage-backed securities	215,420		6	%	197,844		5	%
Commercial mortgage-backed securities	44,082		1	%	26,703		1	%
Other asset-backed securities	156,213		5	%	101,711		3	%
Total fixed maturities, available for sale	2,153,683		62	%	2,280,242		62	%
Fixed maturities, trading	4,148		< 1%		—		—	%
Equity investments	492,159		14	%	470,609		13	%
Short-term investments	349,119		10	%	432,126		12	%
BOLI	62,562		2	%	62,113		1	%
Investment in unconsolidated subsidiaries	401,030		11	%	330,591		9	%
Other investments	35,944		1	%	110,847		3	%
Total investments	$	3,498,645	100	%	$	3,686,528	100	%

The distribution of our investments in available-for-sale fixed maturity securities by rating were as follows:

	March 31, 2018				December 31, 2017
($ in thousands)	Carrying Value		% of Total Investment		Carrying Value		% of Total Investment
Rating*
AAA	$	624,840	29	%	$	617,091	27	%
AA+	126,911		6	%	183,221		8	%
AA	102,636		5	%	173,488		8	%
AA-	145,247		7	%	195,110		9	%
A+	216,128		10	%	210,263		9	%
A	320,244		15	%	296,852		13	%
A-	205,556		10	%	202,581		9	%
BBB+	107,529		5	%	103,023		4	%
BBB	108,631		5	%	100,025		4	%
BBB-	49,475		2	%	48,207		2	%
Below investment grade	117,519		5	%	119,310		6	%
Not rated	28,967		1	%	31,071		1	%
Total	$	2,153,683	100	%	$	2,280,242	100	%
*Average of three NRSRO sources, presented as an S&P equivalent. Source: S&P, Copyright ©2017, S&P Global Market Intelligence

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A detailed listing of our investment holdings as of March 31, 2018 is located under the Financial Information heading on the Investor Relations page of our website which can be reached directly at www.proassurance.com/investmentholdings, or through links from the Investor Relations section of our website, investor.proassurance.com.

We manage our investments to ensure that we will have sufficient liquidity to meet our obligations, taking into consideration the timing of cash flows from our investments, including interest payments, dividends and principal payments, as well as the expected cash flows to be generated by our operations. In addition to the interest and dividends we will receive, we anticipate that between $50 million and $60 million of our investments will mature (or be paid down) each quarter over the next twelve months and become available, if needed, to meet our cash flow requirements. The primary outflow of cash at our insurance subsidiaries is related to paid losses and operating costs, including income taxes. The payment of individual claims cannot be predicted with certainty; therefore, we rely upon the history of paid claims in estimating the timing of future claims payments. To the extent that we may have an unanticipated shortfall in cash, we may either liquidate securities or borrow funds under existing borrowing arrangements through our Revolving Credit Agreement and the FHLB system. As of April 30, 2018, $170 million could be made available for use through our Revolving Credit Agreement, as discussed in this section under the heading "Debt." Given the duration of our investments, we do not foresee a shortfall that would require us to meet operating cash needs through additional borrowings. Additional information regarding the Revolving Credit Agreement is detailed in Note 7 of the Notes to Condensed Consolidated Financial Statements.

As discussed in Note 3 of the Notes to Condensed Consolidated Financial Statements, our fixed maturity and short-term investments include securities deposited with Lloyd's in order to meet our FAL requirement. At March 31, 2018 securities on deposit with Lloyd's included fixed maturities having a fair value of $123.5 million and short-term investments with a fair value of $0.4 million.

Our investment portfolio continues to be primarily composed of high quality fixed income securities with approximately 94% of our fixed maturities being investment grade securities as determined by national rating agencies. The weighted average effective duration of our fixed maturity securities at March 31, 2018 was 3.42 years; the weighted average effective duration of our fixed maturity securities combined with our short-term securities was 2.94 years.

The carrying value and unfunded commitments for certain of our investments were as follows:

	Carrying Value				March 31, 2018
($ in thousands, except expected funding period)	March 31, 2018		December 31, 2017		Unfunded Commitment		Expected funding period in years
Qualified affordable housing project tax credit partnerships (1)	$	80,507	$	84,607	$	1,208	6
Historic tax credit partnerships (2)	5,735		6,118		1,794		1
All other investments, primarily investment fund LPs/LLCs	314,788		294,924		151,254		6
Total	$	401,030	$	385,649	$	154,256
(1) The carrying value reflects our total commitments (both funded and unfunded) to the partnerships, less any amortization, since our initial investment. We fund these investments based on funding schedules maintained by the partnerships.
(2) The carrying value reflects our funded commitments less any amortization.

Investment fund LPs/LLCs are by nature less liquid and may involve more risk than other investments. We manage our risk through diversification of asset class and geographic location. At March 31, 2018, we had investments in 30 separate investment funds with a total carrying value, as shown in the table above, which represented approximately 9% of our total investments. We review and monitor the performance of these investments on a quarterly basis.

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Financing Activities and Related Cash Flows

Treasury Shares

During the three months endedMarch 31, 2018 and 2017, we did not repurchase any common shares and, as of April 30, 2018, our remaining Board authorization was approximately $109.6 million.

ProAssurance Shareholder Dividends

Our Board declared quarterly cash dividends of $0.31 per share during the first quarters of both 2018 and 2017, each of which was paid in the following quarter. Dividends paid in the first quarters of both 2018 and 2017 included special dividends of $4.69 per share, declared in the fourth quarter of each of the previous years. Any decision to pay future cash dividends is subject to the Board’s final determination after a comprehensive review of financial performance, future expectations and other factors deemed relevant by the Board.

Debt

At March 31, 2018 our debt included $250 million of outstanding unsecured senior notes. The notes bear interest at 5.3% annually and are due in 2023 although they may be redeemed in whole or part prior to maturity. There are no financial covenants associated with these notes.

We have a Revolving Credit Agreement which may be used for general corporate purposes, including, but not limited to, short-term working capital, share repurchases as authorized by the Board and support for other activities. Our Revolving Credit Agreement permits borrowings of up to $200 million, and has available a $50 million accordion feature, which, if successfully subscribed, would expand permitted borrowings up to $250 million. During the first quarter of 2018, we repaid $40 million of the balance outstanding on the Revolving Credit Agreement, and at March 31, 2018, our outstanding borrowing was $83 million, on a fully secured basis. In April 2018, we repaid $3 million of the balance outstanding on the Revolving Credit Agreement, and the remaining outstanding borrowing is repayable or renewable in the second quarter of 2018. Repayment can be deferred until expiration of the Revolving Credit Agreement in June 2020. We are in compliance with the financial covenants of the Revolving Credit Agreement.

During 2017, two of our subsidiaries each entered into ten-year mortgage loans collectively totaling approximately $40 million (Mortgage Loans) with one lender in connection with the recapitalization of two office buildings. The Mortgage Loans mature in December 2027 and accrue interest at three-month LIBOR plus 132.5 basis points with principal and interest payable on a quarterly basis. We are in compliance with the financial covenant of the Mortgage Loans.

Additional information regarding our debt is provided in Note 7 of the Notes to Condensed Consolidated Financial Statements.

During 2017, we entered into an interest rate cap agreement with a notional amount of $35 million to manage our exposure to increases in LIBOR on our Mortgage Loans. Per the interest rate cap agreement, we are entitled to receive cash payments if and when the three-month LIBOR exceeds 235 basis points. Additional information on our interest rate cap agreement is provided in Note 8 of the Notes to Condensed Consolidated Financial Statements.

Two of our insurance subsidiaries are members of an FHLB. Through membership, those subsidiaries have access to secured cash advances which can be used for liquidity purposes or other operational needs. In order for us to use FHLB proceeds, regulatory approvals may be required depending on the nature of the transaction. To date, those subsidiaries have not materially utilized their membership for borrowing purposes.

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Results of Operations – Three Months EndedMarch 31, 2018 Compared to Three Months EndedMarch 31, 2017

Selected consolidated financial data for each period is summarized in the table below.

	Three Months Ended March 31
($ in thousands, except per share data)	2018			2017			Change
Revenues:
Net premiums written	$	215,132		$	204,227		$	10,905
Net premiums earned	$	187,159		$	182,903		$	4,256
Net investment result	23,667			24,994			(1,327		)
Net realized investment gains (losses)	(12,517		)	13,280			(25,797		)
Other income	2,723			1,821			902
Total revenues	201,032			222,998			(21,966		)
Expenses:
Net losses and loss adjustment expenses	129,786			119,151			10,635
Underwriting, policy acquisition and operating expenses	57,360			57,108			252
Segregated portfolio cells dividend expense (income)	1,747			2,375			(628		)
Interest expense	3,705			4,133			(428		)
Total expenses	192,598			182,767			9,831
Income before income taxes	8,434			40,231			(31,797		)
Income tax expense (benefit)	(3,422		)	(1,224		)	(2,198		)
Net income	$	11,856		$	41,455		$	(29,599	)
Non-GAAP operating income	$	21,487		$	33,401		$	(11,914	)
Earnings per share:
Basic	$	0.22		$	0.78		$	(0.56	)
Diluted	$	0.22		$	0.77		$	(0.55	)
Non-GAAP operating earnings per share:
Basic	$	0.40		$	0.63		$	(0.23	)
Diluted	$	0.40		$	0.62		$	(0.22	)
Net loss ratio	69.3		%	65.1		%	4.2			pts
Underwriting expense ratio	30.6		%	31.2		%	(0.6		)	pts
Combined ratio	99.9		%	96.3		%	3.6			pts
Operating ratio	88.1		%	83.6		%	4.5			pts
Effective tax rate	(40.6		%)	(3.0		%)	(37.6		)	pts
Return on equity*	3.0		%	9.1		%	(6.1		)	pts
*Annualized
In all tables that follow, the abbreviation "nm" indicates that the information or the percentage change is not meaningful.

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Executive Summary of Operations

The following sections provide an overview of our consolidated and segment results of operations for the three months endedMarch 31, 2018 as compared to the three months endedMarch 31, 2017. See the Segment Operating Results sections that follow for additional information regarding each segment's operating results.

Revenues

The following table shows our consolidated and segment net premiums earned:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Net premiums earned
Specialty P&C	$	116,276	$	113,058	$	3,218		2.8	%
Workers' Compensation	58,407		55,283		3,124			5.7	%
Lloyd's Syndicate	12,476		14,562		(2,086		)	(14.3	%)
Consolidated total	$	187,159	$	182,903	$	4,256		2.3	%

Consolidated net premiums earned increased during the three months endedMarch 31, 2018 as compared to the same respective period of 2017 driven by increases in net premiums earned in our Specialty P&C and Workers' Compensation segments, partially offset by a decrease in net premiums earned in our Lloyd's Syndicate segment. The decrease in net premiums earned in our Lloyd's Syndicate segment was due to the effect of an increase in ceded premiums earned which reflected the impact of higher ceded premiums written during the preceding twelve months due to a revision in our reinsurance agreements at the beginning of 2017. See further discussion in our Segment Operating Results - Lloyd's Syndicate section that follows.

The following table shows our consolidated net investment result:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Net investment income	$	22,027	$	23,186	$	(1,159	)	(5.0	%)
Equity in earnings (loss) of unconsolidated subsidiaries	1,640		1,808		(168		)	(9.3	%)
Net investment result	$	23,667	$	24,994	$	(1,327	)	(5.3	%)

The decrease in our consolidated net investment result for the three months endedMarch 31, 2018 was primarily attributable to a decrease in net investment income of $1.2 million due to reduced earnings from our fixed income portfolio, which reflected lower average investment balances and, to a lesser extent, a decrease in earnings from our unconsolidated subsidiaries. The decrease in earnings from our unconsolidated subsidiaries reflected an increase in partnership operating losses related to our tax credit partnerships as compared to the same period of 2017, almost entirely offset by an increase in our allocable portion of earnings from our investments in LPs/LLCs.

The following table shows our total consolidated net realized investment gains (losses):

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Net impairment losses recognized in earnings	$	—		$	(171	)	$	171		nm
Other net realized investment gains (losses)	(12,517		)	13,451			(25,968		)	(193.1	%)
Net realized investment gains (losses)	$	(12,517	)	$	13,280		$	(25,797	)	(194.3	%)

During the 2018three-month period, we did not recognize any OTTI in earnings. During the 2017three-month period, we recognized OTTI in earnings of $0.2 million and $0.2 million of non-credit OTTI in OCI, both of which related to corporate bonds.

Other net realized investment losses during the three months endedMarch 31, 2018 primarily reflected decreases in the value of our equity trading portfolio whereas other net realized investment gains during the three months ended March 31, 2017 primarily reflected increases in the value of our equity trading portfolio. See further discussion in our Segment Operating Results - Corporate section that follows.

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Expenses

The following table shows our consolidated and segment net loss ratios and net loss development:

	Three Months Ended March 31
($ in millions)	2018			2017			Change
Current accident year net loss ratio
Consolidated ratio	81.5		%	80.9		%	0.6			pts
Specialty P&C	90.4		%	88.7		%	1.7			pts
Workers' Compensation	66.1		%	67.0		%	(0.9		)	pts
Lloyd's Syndicate	70.7		%	72.9		%	(2.2		)	pts
Calendar year net loss ratio
Consolidated ratio	69.3		%	65.1		%	4.2			pts
Specialty P&C	72.7		%	66.3		%	6.4			pts
Workers' Compensation	62.9		%	62.7		%	0.2			pts
Lloyd's Syndicate	68.0		%	65.3		%	2.7			pts
Favorable (unfavorable) net loss development, prior accident years
Consolidated	$	22.8		$	28.8		$	(6.0	)
Specialty P&C	$	20.6		$	25.3		$	(4.7	)
Workers' Compensation	$	1.9		$	2.4		$	(0.5	)
Lloyd's Syndicate	$	0.3		$	1.1		$	(0.8	)

Our consolidated current accident year net loss ratio increased 0.6 percentage points for the 2018three-month period as compared to the same period of 2017 driven by a higher current accident year net loss ratio in our Specialty P&C segment, partially offset by a lower current accident year net loss ratio in our Workers' Compensation segment. The higher current accident year net loss ratio in our Specialty P&C segment was primarily due to both higher volume of earned premium as well as an increase in expected losses in our excess and surplus lines business during the 2018three-month period. The lower current accident year net loss ratio in our Workers' Compensation segment for the 2018three-month period was primarily due to a reduction in overall claim results in the alternative market business. See further discussion in the Segment Operating Results - Specialty P&C and Workers' Compensation sections that follow.

In both the 2018 and 2017three-month periods, our consolidated calendar year net loss ratio was lower than our consolidated current accident year net loss ratio due to the recognition of net favorable loss development, as shown in the previous table.

Our consolidated and segment underwriting expense ratios were as follows:

	Three Months Ended March 31
	2018		2017		Change
Underwriting Expense Ratio
Consolidated	30.6	%	31.2	%	(0.6	)	pts
Specialty P&C	24.3	%	23.0	%	1.3		pts
Workers' Compensation	29.7	%	30.2	%	(0.5	)	pts
Lloyd's Syndicate	58.1	%	42.7	%	15.4		pts
Corporate*	2.5	%	4.5	%	(2.0	)	pts
*There are no net premiums earned associated with the Corporate segment. Ratios shown are the contribution of the Corporate segment to the consolidated ratio (Corporate operating expenses divided by consolidated net premium earned).

Our consolidated underwriting expense ratio decreased slightly for the 2018three-month period as compared to the same respective period of 2017 primarily due to a decrease in consolidated operating expenses, partially offset by an increase in consolidated DPAC amortization. The decrease in consolidated operating expenses in the 2018three-month period was driven by our Corporate segment primarily due to a decrease in share-based compensation expenses and other compensation related costs as compared to the same respective period of 2017. The impact to the consolidated underwriting expense ratio due to the

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increase in consolidated DPAC amortization in the 2018three-month period was driven by our Specialty P&C segment primarily due to higher acquisition costs.

Taxes

Our projected annual effective tax rates for 2018 and 2017 were a benefit of 2.4% and an expense of 4.8% at March 31, 2018 and 2017, respectively, before discrete items were considered. Our projected annual effective tax rates for both the 2018 and 2017three-month periods were different from the statutory federal income tax rate primarily due to a portion of our investment income being tax-exempt and the utilization of tax credits transferred to us from our tax credit partnership investments. Discrete items further reduced our projected annual effective tax rates for the 2018 and 2017three-month periods by 38.2% and 7.8%, respectively, resulting in a total effective tax rate of a benefit of 40.6% and a benefit 3.0%, respectively. Due to the TCJA, the statutory federal income tax rate used to develop the projected annual effective tax rate for 2018 was lower than the statutory federal income tax rate used to develop the projected annual effective tax rate for 2017. The effect of the lower statutory federal income tax rate and our ability to utilize tax credits in the current tax year and previous tax year through carryback provisions of the tax law resulted in our projected annual effective tax rate of a benefit of 2.4% at March 31, 2018.

Our calculation of our projected annual effective tax rate during interim periods has historically included an estimate of annual net realized investment gains and losses based on year-to-date results. Due to the recent volatility in the securities markets, we believe that projections for changes in net realized investment gains and losses during the year cannot be reliably estimated and could cause a significant distortion in the projected annual effective tax rate. Therefore, beginning in the first quarter of 2018, net realized investment gains and losses are treated as discrete items and reflected in the effective tax rate in the period in which they are included in income. This treatment of net realized investment losses of $12.5 million for the three months endedMarch 31, 2018 accounted for 34.7% of the 38.2% reduction in the projected annual effective tax rate due to discrete items.

Operating Ratio and ROE

Our operating ratio (calculated as our combined ratio, less our investment income ratio) increased by 4.5 percentage points in the three months endedMarch 31, 2018 as compared to the same respective period of 2017. The increase primarily reflected a higher net loss ratio in our Specialty P&C segment driven by a lower amount of prior year favorable development, partially offset by a decrease in the underwriting expense ratio in our Corporate segment primarily due to a decrease in share-based compensation expenses and other compensation related costs.

ROE was 3.0% for the three months endedMarch 31, 2018 as compared to 9.1% for the same period of 2017. The decrease for the 2018three-month period was primarily due to a decrease in net income driven by the change in net realized investment gains and losses in our equity trading portfolio, partially offset by a lower average equity base (the denominator of the ROE ratio) as compared to the prior year period. The lower average equity base in 2018 as compared to 2017 was primarily due the cumulative effect of dividend declarations since the prior period.

Book Value per Share

We believe the payment of dividends is currently our most effective tool for the deployment of excess capital even though, in the short-term, dividend declarations dampen growth in book value per share. In addition, our book value per share at March 31, 2018 as compared to December 31, 2017 was impacted by a decrease in AOCI as a result of unrealized losses arising during the period related to our fixed maturity available-for-sale securities which are recognized as a component of OCI. Our book value per share at March 31, 2018 as compared to December 31, 2017 is shown in the following table.

	Book Value Per Share
Book Value Per Share at December 31, 2017	$	29.83
Increase (decrease) to book value per share during the three months ended March 31, 2018 attributable to:
Dividends declared	(0.31		)
Net income	0.22
Decrease in AOCI	(0.49		)
Other	0.03
Book Value Per Share at March 31, 2018	$	29.28

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Non-GAAP Financial Measures

Non-GAAP operating income is a financial measure that is widely used to evaluate performance within the insurance sector. In calculating Non-GAAP operating income, we have excluded the after-tax effects of the items listed in the following table that do not reflect normal operating results.We believe Non-GAAP operating income presents a useful view of the performance of our insurance operations, however it should be considered in conjunction with net income computed in accordance with GAAP.

The following table is a reconciliation of net income to Non-GAAP operating income:

	Three Months Ended March 31
(In thousands, except per share data)	2018			2017
Net income	$	11,856		$	41,455
Items excluded in the calculation of Non-GAAP operating income:
Net realized investment (gains) losses	12,517			(13,280		)
Net realized gains (losses) attributable to SPCs which no profit/loss is retained (1)	(410		)	824
Guaranty fund assessments (recoupments)	84			65
Pre-tax effect of exclusions	12,191			(12,391		)
Tax effect (2)	(2,560		)	4,337
After-tax effect of exclusions	$	9,631		$	(8,054	)
Non-GAAP operating income	$	21,487		$	33,401
Per diluted common share:
Net income	$	0.22		$	0.77
Effect of exclusions	0.18			(0.15		)
Non-GAAP operating income per diluted common share	$	0.40		$	0.62

⁽¹⁾ Net realized investment gains (losses) on investments related to our SPCs are recognized in the earnings of our Corporate segment and the portion of earnings related to the gain or loss, net of our participation, is distributed back to the cells through our SPC dividend expense (income). To be consistent with our exclusion of net realized investment gains (losses) recognized in earnings, we are excluding the portion of net realized investment gains (losses) that is included in SPC dividend expense (income).

⁽²⁾ 21% and 35% are the annual expected incremental tax rates for the three months ended March 31, 2018 and 2017, respectively, associated with the taxable or tax deductible items listed above. Excluding certain discrete items, which are tax effected at the annual expected incremental tax rate in the period they are included in net income, the effective tax rate for each period was applied to these items in calculating net income. See previous discussion in this section under the heading "Taxes."

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Segment Operating Results - Specialty Property & Casualty

Our Specialty P&C segment focuses on professional liability insurance and medical technology liability insurance as discussed in Note 12 of the Notes to Condensed Consolidated Financial Statements. Our Specialty P&C segment operating results reflect pre-tax underwriting profit or loss from these insurance lines, exclusive of investment results, which are included in our Corporate segment. Segment operating results included the following:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Net premiums written	$	121,966		$	117,297		$	4,669			4.0	%
Net premiums earned	$	116,276		$	113,058		$	3,218			2.8	%
Other income	1,256			1,198			58				4.8	%
Net losses and loss adjustment expenses	(84,585		)	(74,994		)	(9,591		)		12.8	%
Underwriting, policy acquisition and operating expenses	(28,276		)	(25,977		)	(2,299		)		8.9	%
Segregated portfolio cells dividend (expense) income	30			28			2				7.1	%
Segment operating results	$	4,701		$	13,313		$	(8,612	)		(64.7	%)
Net loss ratio	72.7		%	66.3		%	6.4			pts
Underwriting expense ratio	24.3		%	23.0		%	1.3			pts

Premiums Written

Changes in our premium volume within our Specialty P&C segment are driven by four primary factors: (1) the amount of new business, (2) our retention of existing business, (3) the premium charged for business that is renewed, which is affected by rates charged and by the amount and type of coverage an insured chooses to purchase and (4) the timing of premium written through multi-period policies. In addition, premium volume may periodically be affected by shifts in the timing of renewals between periods. The healthcare professional liability market, which accounts for a majority of the revenues in this segment, remains challenging as physicians continue joining hospitals or larger group practices and are thus no longer purchasing individual or group policies in the standard market. In addition, some competitors have chosen to compete primarily on price; both factors may impact our ability to write new business and retain existing business.

Gross, ceded and net premiums written were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Gross premiums written	$	140,520	$	136,858	$	3,662		2.7	%
Less: Ceded premiums written	18,554		19,561		(1,007		)	(5.1	%)
Net premiums written	$	121,966	$	117,297	$	4,669		4.0	%

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Gross Premiums Written

Gross premiums written by component were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Professional liability
Physicians (1)
Twelve month term	$	87,845	$	89,742	$	(1,897	)	(2.1	%)
Twenty-four month term	8,249		5,860		2,389			40.8	%
Total Physicians	96,094		95,602		492			0.5	%
Healthcare facilities (2)(7)	15,083		12,170		2,913			23.9	%
Other healthcare providers (3)	8,991		8,740		251			2.9	%
Legal professionals (4)	7,799		7,892		(93		)	(1.2	%)
Tail coverages (5)	4,349		4,862		(513		)	(10.6	%)
Total professional liability	132,316		129,266		3,050			2.4	%
Medical technology liability (6)	8,098		7,537		561			7.4	%
Other	106		55		51			92.7	%
Total	$	140,520	$	136,858	$	3,662		2.7	%

⁽¹⁾  Physician policies were our greatest source of premium revenues in both 2018 and 2017. The decline in twelve month term policies during the 2018three-month period was primarily driven by retention losses and, to a lesser extent, a timing difference related to the shifting in renewal date of one large policy. The decrease was largely offset by new business written, including the addition of one large policy and an increase in premiums assumed in which we participate on a quota share basis. We offer twenty-four month term policies to our physician insureds in one selected jurisdiction. The increase in twenty-four month premium, as compared to 2017, primarily reflected the normal cycle of renewals (policies subject to renewal in 2018 were previously written in 2016 rather than in 2017).

⁽²⁾  Our healthcare facilities premium (which includes hospitals, surgery centers and other facilities) increased during the 2018three-month period primarily due to an increase in coverage pertaining to one large entity which consolidated certain policies that were not previously insured by us and, to a lesser extent, timing differences related to the renewal of certain policies, partially offset by retention losses during the current period.

⁽³⁾  Our other healthcare providers are primarily dentists, chiropractors and allied health professionals. The increase during the 2018three-month period was driven by new business written, including a large policy with a multi-state dental group.

⁽⁴⁾  Our legal professionals policies are primarily individual and small group policies in select areas of practice. The slight decline during the 2018three-month period was primarily due to retention losses, offset almost entirely by new business written and, to a lesser extent, an increase in the rate charged for certain renewed policies in select states due to rate filings. This increase in renewal pricing was the primary driver of retention losses during the period.

⁽⁵⁾  We offer extended reporting endorsement or "tail" coverage to insureds who discontinue their claims-made coverage with us, and we also periodically offer tail coverage through custom policies. The amount of tail coverage premium written can vary widely from period to period.

⁽⁶⁾  Our medical technology liability business is marketed throughout the U.S.; coverage is offered on a primary basis, within specified limits, to manufacturers and distributors of medical technology and life sciences products including entities conducting human clinical trials. In addition to the previously listed factors that affect our premium volume, our medical technology liability premium volume is impacted by the sales volume of insureds. The increase during the 2018three-month period primarily reflected new business written and, to a lesser extent, an increase in the rate charged for certain renewed policies, largely offset by retention losses. Retention losses are largely attributable to an increase in competition on terms and pricing.

⁽⁷⁾  Our alternative market solutions include writing healthcare premium in certain SPCs of our wholly owned Cayman Islands reinsurance subsidiaries, Eastern Re and Inova Re. We wrote healthcare professional liability premium in our healthcare facilities line of business of approximately $3.2 million and $2.6 million in the 2018 and 2017three-month periods, respectively. All or a portion of the premium written was ceded to the SPCs. Under the SPC structure, the operating results of each cell, net of any participation we have taken in the SPCs, accrue to the benefit of the external owners of that cell. Our Specialty P&C segment does not currently participate in the cells that write HCPL premium, and

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therefore retains no underwriting profit or loss. Additional information regarding the SPCs is included in the Underwriting, Policy Acquisition and Operating Expense section that follows under the heading "Segregated Portfolio Dividend Expense (Income)."

New business written by component on a direct basis was as follows:

	Three Months Ended March 31
(In millions)	2018		2017
Physicians	$	5.0	$	6.4
Healthcare facilities	2.1		1.0
Other healthcare providers	1.4		0.7
Legal professionals	0.8		0.9
Medical technology liability	0.9		1.2
Total	$	10.2	$	10.2

For our Specialty P&C segment, we calculate our retention rate as annualized renewed premium divided by all annualized premium subject to renewal. Retention rates are affected by a number of factors. We may lose insureds to competitors or to alternative insurance mechanisms such as risk retention groups or self-insurance entities (often when physicians join hospitals or large group practices) or due to pricing or other issues. We may choose not to renew an insured as a result of our underwriting evaluation. Insureds may also terminate coverage because they have left the practice of medicine for various reasons, principally for retirement, death or disability, but also for personal reasons.

Retention by component was as follows:

	Three Months Ended March 31
	2018		2017
Physicians*	91	%	90	%
Healthcare facilities*	86	%	90	%
Other healthcare providers*	87	%	85	%
Legal professionals	82	%	84	%
Medical technology liability	87	%	80	%
* Excludes certain policies written on an excess and surplus lines basis.

The pricing of our business includes the effects of filed rates, surcharges and discounts. Renewal pricing also reflects changes in our exposure base, deductibles, self-insurance retention limits and other policy items. We continue to base our pricing on expected losses, as indicated by our historical loss data and available industry loss data. We are committed to a rate structure that will allow us to fulfill our obligations to our insureds, while generating competitive returns for our shareholders.

Changes in renewal pricing by component was as follows:

	Three Months Ended March 31
	2018
Physicians (1)	1	%
Healthcare facilities (1)	3	%
Other healthcare providers (1)	3	%
Legal professionals (2)	6	%
Medical technology liability	5	%
(1) Excludes certain policies written on an excess and surplus lines basis.
(2) See Gross Premiums Written section for further explanation of renewal pricing increase.

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Ceded Premiums Written

Ceded premiums represent the amounts owed to our reinsurers for their assumption of a portion of our losses. Through our current excess of loss reinsurance arrangements we generally retain the first $1 million in risk insured by us and cede coverages in excess of this amount. For our medical technology liability coverages, we also retain 10% of the next $9 million of risk for coverages in excess of $1 million. We pay our reinsurers a ceding premium in exchange for their accepting the risk, the ultimate amount of which is determined by the loss experience of the business ceded, subject to certain minimum and maximum amounts.

Ceded premiums written were as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Excess of loss reinsurance arrangements (1)	$	8,923		$	8,072		$	851		10.5	%
Premium ceded to Syndicate 1729 (2)	2,105			4,263			(2,158		)	(50.6	%)
Other shared risk arrangements (3)	8,513			8,446			67			0.8	%
Other ceded premiums written	938			880			58			6.6	%
Adjustment to premiums owed under reinsurance agreements, prior accident years, net (4)	(1,925		)	(2,100		)	175			8.3	%
Total ceded premiums written	$	18,554		$	19,561		$	(1,007	)	(5.1	%)

⁽¹⁾  We generally reinsure risks under our excess of loss reinsurance arrangements pursuant to which the reinsurers agree to assume all or a portion of all risks that we insure above our individual risk retention levels, up to the maximum individual limits offered. In the majority of our excess of loss reinsurance arrangements, the premium due to the reinsurer is determined by the loss experience of that business reinsured, subject to certain minimum and maximum amounts. The increase in ceded premiums written under our excess of loss reinsurance arrangements for the 2018three-month period primarily reflected an increase in the premiums we expect to owe our reinsurers based upon an increase in our estimates of losses recoverable from our reinsurance partners.

⁽²⁾  As previously discussed, we are the majority participant in Syndicate 1729 and normally record our pro rata share of its operating results in our Lloyd's Syndicate segment on a quarter delay, except when information is available that is material to the current period. We also record the cession to the Lloyd's Syndicate segment from our Specialty P&C segment on a quarter delay as the amounts are not material and this permits the cession to be reported by both the Lloyd's Syndicate segment and the Specialty P&C segment in the same reporting period. The decrease in premiums ceded to Syndicate 1729 for the 2018three-month period reflected the revised contract terms effective January 1, 2017 which reduced the premiums ceded by essentially half. We did not renew our quota share agreement with Syndicate 1729 on January 1, 2018, however the impact will not be reflected in ceded premiums until the second quarter of 2018 due to the previously mentioned quarter delay. See the Segment Operating Results - Lloyd's Syndicate section for further discussion on the quota share agreement. As our premiums are earned, we recognize the related ceding commission income which reduces underwriting expense by offsetting DPAC amortization. For the 2018 and 2017three-month periods the related ceding commission income was approximately 27% of ceded premiums written. For our consolidated results, eliminations of the inter-segment portion (58% of the Specialty P&C cession) of the transactions are also recorded on a quarter delay.

⁽³⁾  We have entered into various shared risk arrangements, including quota share, fronting, and captive arrangements, with certain large healthcare systems and other insurance entities. These arrangements include our Ascension Health and CAPAssurance programs. While we cede a large portion of the premium written under these arrangements, they provide us an opportunity to grow net premium through strategic partnerships. The slight increase in the 2018three-month period was primarily driven by growth in our CAPAssurance program.

⁽⁴⁾  Given the length of time that it takes to resolve our claims, many years may elapse before all losses recoverable under a reinsurance arrangement are known. As a part of the process of estimating our loss reserve we also make estimates regarding the amounts recoverable under our reinsurance arrangements. As previously discussed, the premiums ultimately ceded under certain of our excess of loss reinsurance arrangements are subject to the losses ceded under the arrangements. Based upon adjustments in 2018 and 2017three-month periods to our estimate of expected losses and associated recoveries for prior year ceded losses, we reduced our estimate of ceded premiums owed to reinsurers. Changes to estimates of premiums ceded related to prior accident years are fully earned in the period the changes in estimates occur.

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Ceded Premiums Ratio

As shown in the table below, our ceded premiums ratio was affected in both 2018 and 2017 by revisions to our estimate of premiums owed to reinsurers related to coverages provided in prior accident years.

	Three Months Ended March 31
	2018		2017		Change
Ceded premiums ratio, as reported	13.2	%	14.3	%	(1.1	)	pts
Less the effect of adjustments in premiums owed under reinsurance agreements, prior accident years (as previously discussed)	(1.4	%)	(1.5	%)	0.1		pts
Ratio, current accident year	14.6	%	15.8	%	(1.2	)	pts

The decrease in the current accident year ceded premiums ratio for the 2018three-month period was primarily attributable to a decrease in premiums ceded to Syndicate 1729, partially offset by an increase in premiums ceded under our excess of loss reinsurance arrangements (see discussion under the heading "Ceded Premiums Written").

Net Premiums Earned

Net premiums earned were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Gross premiums earned	$	133,698	$	131,782	$	1,916		1.5	%
Less: Ceded premiums earned	17,422		18,724		(1,302		)	(7.0	%)
Net premiums earned	$	116,276	$	113,058	$	3,218		2.8	%

Net premiums earned consist of gross premiums earned less the portion of earned premiums that we cede to our reinsurers for their assumption of a portion of our losses. Because premiums are generally earned pro rata over the entire policy period, fluctuations in premiums earned tend to lag those of premiums written. Generally, our policies carry a term of one year, however, as discussed above, we write certain policies with a twenty-four month term, and a few of our medical technology liability policies have a multi-year term. Tail coverage premiums are generally 100% earned in the period written because the policies insure only incidents that occurred in prior periods and are not cancellable. Additionally, ceded premium changes due to changes to estimates of premiums owed under reinsurance agreements for prior accident years are fully earned in the period of change.

The increase in gross premiums earned during the 2018three-month period primarily reflected the pro rata effect of the higher premiums written during the preceding twelve months, predominantly in our physicians line of business. The decrease in ceded premiums earned during the 2018three-month period primarily reflected the pro rata effect of the decrease in premiums ceded to Syndicate 1729 during the preceding twelve months, somewhat offset by the change in prior accident year ceded premium reductions, which were $0.2 million lower for the 2018three-month period as compared to the 2017three-month period (see discussion under the heading "Ceded Premiums Written").

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Losses and Loss Adjustment Expenses

The determination of calendar year losses involves the actuarial evaluation of incurred losses for the current accident year and the actuarial re-evaluation of incurred losses for prior accident years, including an evaluation of the reserve amounts required for losses in excess of policy limits.

Accident year refers to the accounting period in which the insured event becomes a liability of the insurer. For claims-made policies, which represent over 90% of the premiums written in our Specialty P&C segment, the insured event generally becomes a liability when the event is first reported to us. For occurrence policies, the insured event becomes a liability when the event takes place. We believe that measuring losses on an accident year basis is the best measure of the underlying profitability of the premiums earned in that period, since it associates policy premiums earned with the estimate of the losses incurred related to those policy premiums.

The following table summarizes calendar year net loss ratios by separating losses between the current accident year and all prior accident years. Additionally, the table shows our current accident year net loss ratio was affected by revisions to our estimate of premiums owed to reinsurers related to coverages provided in prior accident years. Net loss ratios for the period were as follows:

	Net Loss Ratios (1)
	Three Months Ended March 31
	2018		2017		Change
Calendar year net loss ratio	72.7	%	66.3	%	6.4	pts
Less impact of prior accident years on the net loss ratio	(17.7	%)	(22.4	%)	4.7	pts
Current accident year net loss ratio	90.4	%	88.7	%	1.7	pts
Less estimated ratio increase (decrease) attributable to:
Ceded premium adjustments, prior accident years (2)	(1.5	%)	(1.7	%)	0.2	pts
Current accident year net loss ratio, excluding the effect of prior year ceded premium (3)	91.9	%	90.4	%	1.5	pts

⁽¹⁾  Net losses, as specified, divided by net premiums earned.

⁽²⁾  Reductions to premiums owed under reinsurance agreements for prior accident years increased net premiums earned (the denominator of the current accident year ratio) for the 2018 and 2017three-month periods. See the discussion in the Premiums section for our Specialty P&C segment under the heading "Ceded Premiums Written" for additional information.

⁽³⁾  The current accident year net loss ratio for the 2018three-month period increased 1.5 percentage points when compared to the same respective period of 2017. The increase was driven by both higher volume of earned premium as well as an increase in expected losses in our excess and surplus lines business, which resulted in a 1.9 percentage point increase in the current accident year net loss ratio when compared to the 2017three-month period. The increase was partially offset by the impact of the revision to our quota share reinsurance agreement with Syndicate 1729. Due to the revised contract terms, we are retaining more premium that carries a lower loss ratio as compared to the segment's total book of business which resulted in a 0.7 percentage point decrease in the current accident year net loss ratio when compared to the 2017three-month period.

We recognized net favorable loss development related to our previously established reserves of $20.6 million and $25.3 million during the three months endedMarch 31, 2018 and 2017, respectively. We re-evaluate our previously established reserve each quarter based on our most recently available claims data and currently available industry trend information. Development recognized during the three months endedMarch 31, 2018 principally related to accident years 2011 through 2015. Development recognized during the three months endedMarch 31, 2017 principally related to accident years 2009 through 2014.

A detailed discussion of factors influencing our recognition of loss development is included in our Critical Accounting Estimates section under the heading "Reserve for Losses and Loss Adjustment Expenses" and in our 2017 Form 10-K under the same heading. Assumptions used in establishing our reserve are regularly reviewed and updated by management as new data becomes available. Any adjustments necessary are reflected in the then current operations. Due to the size of our reserve, even a small percentage adjustment to the assumptions can have a material effect on our results of operations for the period in which the change is made, as was the case in both 2018 and 2017.

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Underwriting, Policy Acquisition and Operating Expenses

Our Specialty P&C segment underwriting, policy acquisition and operating expenses were comprised as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
DPAC amortization	$	13,034	$	11,185	$	1,849	16.5	%
Management fees	1,697		1,652		45		2.7	%
Other underwriting and operating expenses	13,545		13,140		405		3.1	%
Total	$	28,276	$	25,977	$	2,299	8.9	%

DPAC amortization increased for the three months endedMarch 31, 2018 as compared to the same period of 2017 driven by a decrease in ceding commission income, which is an offset to expense, primarily due to a reduction in premiums ceded to Syndicate 1729 and, to a lesser extent, an increase in commission expense.

Management fees are charged pursuant to a management agreement by the Corporate segment to the operating subsidiaries within our Specialty P&C segment for services provided, based on the extent to which services are provided to the subsidiary and the amount of premium written by the subsidiary. While the terms of the management agreement were consistent between 2017 and 2018, fluctuations in the amount of premium written by each subsidiary can result in corresponding variations in the management fee charged to each subsidiary during a particular period.

Other underwriting and operating expenses increased slightly during the 2018three-month period as compared to the same period of 2017 with no individually significant variances in expense categories.

Underwriting Expense Ratio (the Expense Ratio)

Our expense ratio for the Specialty P&C segment for the three months endedMarch 31, 2018 and 2017, respectively, was as follows:

	Three Months Ended March 31
	2018		2017		Change
Underwriting expense ratio	24.3	%	23.0	%	1.3	pts

The increase in the underwriting expense ratio for 2018three-month period was primarily due to the effect of an increase in DPAC amortization as previously discussed, partially offset by an increase in net premiums earned as compared to the same respective period of 2017.

Segregated Portfolio Cell Dividend (Expense) Income

Our alternative market solutions includes writing HCPL premium in our Cayman Islands reinsurance subsidiaries. Consistent with the SPC structure discussed in the Segment Operating Results - Workers' Compensation section that follows, the net operating results of each cell, net of any participation we have taken in the SPCs, are due to the external owners of that cell. Our Specialty P&C segment does not currently participate in the cells that write HCPL premium, and therefore retains no profit or loss. See more information on our SPCs under the heading "Underwriting, Policy Acquisition and Operating Expenses" in the Segment Operating Results - Workers' Compensation section that follows. SPC dividend (expense) income was as follows:

	Three Months Ended March 31
(In thousands)	2018		2017		Change
SPC dividend (expense) income	$	30	$	28	$	2	7.1	%

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Segment Operating Results - Workers' Compensation

Our Workers' Compensation segment provides traditional workers' compensation insurance products and alternative market solutions for workers' compensation risks to employers generally with 1,000 or fewer employees, as discussed in Note 12 of the Notes to Condensed Consolidated Financial Statements. For the three months endedMarch 31, 2018 and 2017, segment operating results reflected pre-tax underwriting profit or loss, which excludes the operating results of the SPCs, net of our participation. Investment results, which include the SPC investment results, are included in our Corporate segment. Segment operating results included the following:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Net premiums written	$	81,325		$	75,570		$	5,755		7.6	%
Net premiums earned	$	58,407		$	55,283		$	3,124		5.7	%
Other income	366			145			221			152.4	%
Net losses and loss adjustment expenses	(36,715		)	(34,650		)	(2,065		)	6.0	%
Underwriting, policy acquisition and operating expenses	(17,333		)	(16,691		)	(642		)	3.8	%
Segregated portfolio cells dividend (expense) income (1)	(1,894		)	(1,174		)	(720		)	61.3	%
Segment operating results	$	2,831		$	2,913		$	(82	)	(2.8	%)
Net loss ratio
Traditional business	65.2%			65.0%			0.2			pts
Alternative market business	56.6%			56.6%			—			pts
Segment results	62.9%			62.7%			0.2			pts
Underwriting expense ratio
Traditional business	29.3%			30.0%			(0.7		)	pts
Alternative market business	30.7%			30.6%			0.1			pts
Segment results	29.7%			30.2%			(0.5		)	pts
(1) Represents the underwriting (profit) loss attributable to the alternative market business ceded to the SPCs at our Cayman Islands reinsurance subsidiaries, Eastern Re and Inova Re, net of our participation.

During the first quarter of 2018, we reorganized our Cayman Islands SPC operations. Beginning in 2018, all new and renewing alternative market business previously ceded to the SPCs at Eastern Re, with the exception of one program, is now ceded to SPCs operated by a newly formed wholly owned Cayman Islands subsidiary, Inova Re. As part of the reorganization, all SPCs previously operated by Eastern Re, with the exception of one program, ceased assuming new and renewing business on or after January 1, 2018. The external cell owners' cumulative undistributed earnings and the results of all SPCs for the current period due to external cell owners continue to be reported as SPC dividends payable and SPC dividend expense, respectively.

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Premiums Written

Our workers’ compensation premium volume is driven by four primary factors: (1) the amount of new business written, (2) audit premium, (3) retention of our existing book of business and (4) premium rates charged on our renewal book of business.

Gross, ceded and net premiums written were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Gross premiums written
Traditional business*	$	58,744	$	53,031	$	5,713		10.8	%
Alternative market business	32,605		31,199		1,406			4.5	%
Segment results	91,349		84,230		7,119			8.5	%
Less: Ceded premiums written
Traditional business	3,581		1,955		1,626			83.2	%
Alternative market business*	6,443		6,705		(262		)	(3.9	%)
Segment results	10,024		8,660		1,364			15.8	%
Net premiums written
Traditional business	55,163		51,076		4,087			8.0	%
Alternative market business	26,162		24,494		1,668			6.8	%
Segment results	$	81,325	$	75,570	$	5,755		7.6	%
* Traditional gross premiums written and alternative market ceded premiums written are reported net of alternative market premiums assumed by our traditional business totaling $0.3 million and $0.2 million for the 2018 and 2017 three-month periods, respectively.

Our traditional workers’ compensation insurance products include guaranteed cost, dividend, deductible and retrospectively-rated policies. Our alternative market business is 100% ceded to either the SPCs at our wholly owned Cayman Islands reinsurance subsidiaries, Eastern Re or Inova Re, or to unaffiliated captive insurers. As of March 31, 2018, there were 24 (20 active) SPCs and 2 active alternative market programs with unaffiliated captive insurers.

Additional information regarding the structure of the SPCs is included under the heading "Segregated Portfolio Dividend Expense (Income)."

Gross Premiums Written

Gross premiums written in our traditional and alternative market business for the three months endedMarch 31, 2018 and 2017 are reflected in the table above. Gross premiums written increased during the three months endedMarch 31, 2018 as compared to the three months ended March 31, 2017, driven by growth in both our traditional and alternative market business. Growth in our traditional business was driven by new business written including $3.7 million of premium written related to the 2017 acquisition of Great Falls' book of business, partially offset by a decrease in renewal pricing during the period. Growth in our alternative market business was driven by new business written and an improvement in renewal pricing during the period. We retained 9 of the 10 available alternative market programs up for renewal during the three months endedMarch 31, 2018.

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New business, audit premium, retention and renewal price changes for both the traditional business and the alternative market business for 2018 and 2017 are shown in the table below:

	Three Months Ended March 31
	2018									2017
($ in millions)	Traditional Business			Alternative Market Business			Segment Results			Traditional Business			Alternative Market Business			Segment Results
New business	$	13.7		$	2.9		$	16.6		$	9.4		$	4.6		$	14.0
Audit premium (including EBUB)	$	1.2		$	0.1		$	1.3		$	1.1		$	0.2		$	1.2
Retention rate (1)	83		%	91		%	86		%	85		%	96		%	89		%
Change in renewal pricing (2)	(4		%)	(1		%)	(3		%)	(4		%)	(4		%)	(3		%)
(1) We calculate our workers' compensation retention rate as annualized expiring renewed premium divided by all annualized expiring premium subject to renewal. Our retention rate can be impacted by various factors, including price or other competitive issues, insureds being acquired, or a decision not to renew based on our underwriting evaluation.
(2) The pricing of our business includes an assessment of the underlying policy exposure and the effects of current market conditions. We continue to base our pricing on expected losses, as indicated by our historical loss data. The renewal rate decreases reflected the competitive workers’ compensation environment.

Ceded Premiums Written

Ceded premiums written reflected our external reinsurance programs and alternative market business ceded to unaffiliated captive insurance companies.

Ceded premiums written were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017			Change
Premiums ceded to external reinsurers
Traditional business	$	2,907	$	2,759		$	148		5.4	%
Alternative market business	3,060		3,008			52			1.7	%
Segment results	5,967		5,767			200			3.5	%
Change in return premium estimate under external reinsurance
Traditional business	673		(804		)	1,477			183.7	%
Alternative market business	—		—			—			nm
Segment results	673		(804		)	1,477			183.7	%
Premiums ceded to unaffiliated captive insurers
Traditional business	—		—			—			nm
Alternative market business	3,384		3,697			(313		)	(8.5	%)
Segment results	3,384		3,697			(313		)	(8.5	%)
Total ceded premiums written
Traditional business	3,580		1,955			1,625			83.1	%
Alternative market business	6,444		6,705			(261		)	(3.9	%)
Segment results	$	10,024	$	8,660		$	1,364		15.8	%

We retain the first $0.5 million in risk insured by us on our traditional business and cede losses in excess of this amount on each loss occurrence under our primary external reinsurance contract. The traditional external reinsurance contract contains a return premium provision under which we estimate return premium based on the underlying loss experience of policies covered under the contract. In our alternative market business, the risk retention for each loss occurrence ranges from $0.3 million to $0.35 million based on the alternative market program. We cede 100% of premiums written under two alternative market programs to unaffiliated captive insurers.

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Per our reinsurance agreements, we cede premiums related to our traditional business on an earned premium basis, whereas alternative market premiums are ceded on a written premium basis. The increase in traditional premiums ceded to external reinsurers during the three months endedMarch 31, 2018 primarily reflected an increase in premiums earned and an increase in reinsurance rates in the current contract year. The slight increase in alternative market premiums ceded to external reinsurers during the three months endedMarch 31, 2018 primarily reflected an increase in written premium. External reinsurance rates vary based on the alternative market program.

Changes in the return premium estimate reflected the loss experience under the reinsurance contract for the three months endedMarch 31, 2018 and 2017. The decrease in the return premium estimate for the three months endedMarch 31, 2018 primarily reflected severity-related claims activity during the first quarter of 2018.

Ceded Premiums Ratio

Ceded premiums ratio was as follows:

	Three Months Ended March 31
	2018			2017			Change
	Traditional Business	Alternative Market Business	Segment Results	Traditional Business	Alternative Market Business	Segment Results	Traditional Business	Alternative Market Business	Segment Results
Ceded premiums ratio, as reported	6.1%	19.8%	11.0%	3.7%	21.5%	10.3%	2.4	(1.7)	0.7
Less the effect of:
Return premium estimated under external reinsurance	1.1%	—%	0.7%	(1.5%)	—%	(1.0%)	2.6	—	1.7
Premiums ceded to unaffiliated captive insurers (100%)	—%	9.3%	3.4%	—%	10.6%	4.2%	—	(1.3)	(0.8)
Ceded premiums ratio, less the effects of above	5.0%	10.5%	6.9%	5.2%	10.9%	7.1%	(0.2)	(0.4)	(0.2)

The above table reflects ceded premiums as a percent of gross premiums written. As discussed above, we cede premiums related to our traditional business on an earned premium basis, whereas alternative market premiums are ceded on a written premium basis. The decrease in the traditional ceded premiums ratio reflected the increase in direct written premium for the three months endedMarch 31, 2018 as compared to 2017. Traditional ceded premiums as a percent of traditional earned premiums increased in the 2018three-month period when compared to the 2017 three-month period, which reflected an increase in reinsurance rates. The alternative markets ceded premiums ratio, less the effect of premiums ceded to the unaffiliated captive insurers, reflected premiums ceded to our external reinsurers related to the SPCs at Eastern Re. The reinsurance rates for our alternative market business vary by program.

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Net Premiums Earned

Net premiums earned were as follows:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Gross premiums earned
Traditional business*	$	46,030	$	41,768	$	4,262		10.2	%
Alternative market business	19,381		19,446		(65		)	(0.3	%)
Segment results	65,411		61,214		4,197			6.9	%
Less: Ceded premiums earned
Traditional business	3,532		1,955		1,577			80.7	%
Alternative market business*	3,472		3,976		(504		)	(12.7	%)
Segment results	7,004		5,931		1,073			18.1	%
Net premiums earned
Traditional business	42,498		39,813		2,685			6.7	%
Alternative market business	15,909		15,470		439			2.8	%
Segment results	$	58,407	$	55,283	$	3,124		5.7	%
* Traditional gross premiums earned and alternative market ceded premiums earned are reported net of alternative market premiums assumed by our traditional business totaling $0.2 million and $0.1 million for the 2018 and 2017 three-month periods, respectively.

Net premiums earned consist of gross premiums earned less the portion of earned premiums that we cede to our reinsurers for their assumption of a portion of our losses. Because premiums are generally earned pro rata over the entire policy period, fluctuations in premiums earned tend to lag those of premiums written. Our workers’ compensation policies are twelve-month policies and premiums are earned on a pro rata basis over the policy period. Net premiums earned also include premium adjustments related to the audit of our insureds' payrolls. Payroll audits are conducted subsequent to the end of the policy period and any related adjustments are recorded as fully earned in the current period. In addition, we record an estimate for EBUB and evaluate the estimate on a quarterly basis. We did not adjust the EBUB estimate during the three months endedMarch 31, 2018 or 2017. The increase in net premiums earned in our traditional business primarily reflected the pro rata effect of higher net premiums written during the preceding twelve months.

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Losses and Loss Adjustment Expenses

The following table summarizes calendar year net loss ratios by separating losses between the current accident year and all prior accident years. Calendar year and current accident year net loss ratios by component were as follows:

	Three Months Ended March 31
	2018						2017						Change
	Traditional Business		Alternative Market Business		Segment Results		Traditional Business		Alternative Market Business		Segment Results		Traditional Business	Alternative Market Business		Segment Results
Calendar year net loss ratio*	65.2	%	56.6	%	62.9	%	65.0	%	56.6	%	62.7	%	0.2	—		0.2
Less impact of prior accident years on the net loss ratio	(0.9	%)	(9.6	%)	(3.2	%)	(1.0	%)	(12.9	%)	(4.3	%)	0.1	3.3		1.1
Current accident year net loss ratio	66.1	%	66.2	%	66.1	%	66.0	%	69.5	%	67.0	%	0.1	(3.3	)	(0.9	)
Less impact of audit premium on loss ratio	—	%	(0.3	%)	(0.1	%)	—	%	(0.8	%)	(0.2	%)	—	0.5		0.1
Current accident year net loss ratio, excluding the effect of audit premium	66.1	%	66.5	%	66.2	%	66.0	%	70.3	%	67.2	%	0.1	(3.8	)	(1.0	)
* The net loss ratios for the 2018 and 2017 three-month periods in the above tables are calculated before the impact of $0.2 million and $0.1 million, respectively, of premiums earned that is assumed by and ceded from the traditional and alternative markets business.

The current accident year net loss ratio in our traditional business for the 2018three-month period was consistent as compared to the same period of 2017. We continue to experience favorable trends in claims closing results, which has offset the impact of renewal rate decreases on the current accident year net loss ratio. The current accident year net loss ratio in our alternative market business reflected the aggregate loss ratio for all programs. While there was an increase in severity related claims during the first quarter of 2018, there was a reduction in overall claim results, resulting in a decrease to the current accident year net loss ratio in the 2018three-month period. Loss reserves are estimated for each program on a quarterly basis. Due to the size of some of the programs, quarterly claims activity can cause the current accident year net loss ratio to fluctuate significantly from period to period.

Calendar year incurred losses ceded to our external reinsurers in both our traditional and alternative market business totaled $13.0 million for the three months endedMarch 31, 2018 compared to ceded incurred losses of $5.1 million for the same period of 2017. The increase in ceded incurred losses for the three months endedMarch 31, 2018 primarily reflected unfavorable development on prior year claims that resulted in losses exceeding the reinsurance retention and a large reinsurance claim related to the current accident year.

We recognized net favorable prior year development related to our previously established reserve of $1.9 million and $2.4 million for the three months endedMarch 31, 2018 and 2017, respectively. In both the three months endedMarch 31, 2018 and 2017, net favorable prior year development included $0.4 million related to amortization of the purchase accounting fair value adjustment for our traditional business. Net favorable prior year development for the three months endedMarch 31, 2018 and 2017 included $1.5 million and $2.0 million, respectively, for our alternative market business which primarily reflected better than expected claims trends in the 2016 accident year.

Within our alternative market business, audit premium from insureds results in a decrease in the net loss ratio, whereas audit premium returned to insureds results in an increase in the net loss ratio. We recognized audit premium of $0.1 million and $0.2 million in the three months endedMarch 31, 2018 and 2017, respectively, the effect of which is reflected in the previous table.

In our traditional business, we estimate our current accident year loss and loss adjustment expenses based on an expected loss ratio. Incurred losses and loss adjustment expenses are determined by applying the expected loss ratio to net premiums earned, which includes audit premium, for the respective period. In our alternative market business, we estimate our current accident year losses and loss adjustment expenses based on the underlying actuarial methodologies without consideration of audit premium. As a result, we removed the effects of audit premium in the previous table for purposes of evaluating the current accident year net loss ratio.

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Underwriting, Policy Acquisition and Operating Expenses

Underwriting, policy acquisition and operating expenses includes the amortization of commissions, premium taxes and underwriting salaries, which are capitalized and deferred over the related workers’ compensation policy period, net of external ceding commissions earned. The capitalization of underwriting salaries can vary as they are subject to the success rate of our contract acquisition efforts. These expenses also include a management fee charged by our Corporate segment, which represents intercompany charges pursuant to a management agreement, and the amortization of intangible assets, primarily related to the acquisition of Eastern by ProAssurance. The management fee is based on the extent to which services are provided to the subsidiary and the amount of premium written by the subsidiary.

The table below provides a comparison of underwriting, policy acquisition and operating expenses:

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Traditional business	$	12,514	$	11,977	$	537	4.5	%
Alternative market business	4,819		4,714		105		2.2	%
Underwriting, policy acquisition and operating expenses	$	17,333	$	16,691	$	642	3.8	%

The increase in underwriting, policy acquisition and operating expenses in our traditional business for the three months endedMarch 31, 2018 as compared to the same period of 2017 primarily reflected an increase in compensation related costs and policy acquisition costs driven by the effect of higher gross premiums earned in the 2018 three-month period.

Underwriting Expense Ratio (the Expense Ratio)

The underwriting expense ratio included the impact of the following:

	Three Months Ended March 31
	2018						2017						Change
	Traditional Business		Alternative Market Business		Segment Results		Traditional Business		Alternative Market Business		Segment Results		Traditional Business		Alternative Market Business		Segment Results
Underwriting expense ratio, as reported*	29.3	%	30.7	%	29.7	%	30.0	%	30.6	%	30.2	%	(0.7	)	0.1		(0.5	)
Less estimated ratio increase (decrease) attributable to:
Amortization of intangible assets	2.0	%	—	%	1.5	%	1.8	%	—	%	1.3	%	0.2		—		0.2
Management fee	1.6	%	—	%	1.2	%	1.6	%	—	%	1.1	%	—		—		0.1
Impact of audit premium	(0.7	%)	(0.1	%)	(0.6	%)	(0.7	%)	(0.3	%)	(0.6	%)	—		0.2		—
Impact of return premium estimate	0.4	%	—	%	0.3	%	(0.6	%)	—	%	(0.4	%)	1.0		—		0.7
Underwriting expense ratio, less listed effects	26.0	%	30.8	%	27.3	%	27.9	%	30.9	%	28.8	%	(1.9	)	(0.1	)	(1.5	)
* The underwriting expense ratios for the 2018 and 2017 three-month periods in the above tables are calculated before the impact of $0.2 million and $0.1 million, respectively, of premiums earned that is assumed by and ceded from the traditional and alternative markets business.

The decrease in the traditional expense ratio for the three months endedMarch 31, 2018, exclusive of the items noted in the table, primarily reflected the increase in net premiums earned which included the effect of net retrospective return premium adjustments. Retrospective return premium adjustments increased earned premium by $0.5 million for the three months endedMarch 31, 2018 and decreased earned premium by $0.3 million for the same period in 2017. There were no other individually significant variances by expense category that contributed to the remaining decrease in the traditional expense ratio. The slight decrease in the alternative market business expense ratio for the three months endedMarch 31, 2018 primarily reflected ceding commissions, which vary by program.

Segregated Portfolio Cell Dividend Expense (Income)

Our Workers' Compensation segment provides turn-key workers' compensation alternative market solutions that include program design, fronting, claims administration, risk management, SPC rental, asset management and SPC management services. The asset management and SPC management services are outsourced to a third party. Alternative market customers include individual companies, groups and associations.

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The SPCs are segregated pools of assets and liabilities that provide an insurance facility for a defined set of risks. Assets of each SPC are solely for the benefit of that individual cell and each SPC is solely responsible for the liabilities of that individual cell. Assets of one SPC are statutorily protected from the creditors of the others. We participate to a varying degree in the results of selected SPCs. Our ownership interest in the SPCs in which we participate is as low as 25% and as high as 85%. Under the SPC structure, the net operating results of each cell, net of our participation, are due to the external owners of that cell.

The SPC financial results are included in the following table. The SPC net operating results represent the operating results of each cell in the aggregate.

	Three Months Ended March 31
($ in thousands)	2018		2017		Change
Net premiums earned	$	15,707	$	15,417	$	290		1.9	%
Other income	30		20		10			50.0	%
Less: Net losses and loss adjustment expenses	8,890		8,727		163			1.9	%
Less: Underwriting, policy acquisition and operating expenses	4,819		4,714		105			2.2	%
SPC net operating results - profit/(loss)	2,028		1,996		32			1.6	%
Less: Eastern participation - profit/(loss)	134		822		(688		)	(83.7	%)
SPC dividend expense (income)	$	1,894	$	1,174	$	720		61.3	%

For the 2018three-month period, the slight increase in SPC net operating results, prior to our participation, primarily reflected an increase in net premiums earned and net favorable prior year development. The decrease in our participation primarily reflected the impact of our share of the SPC investment results.

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Segment Operating Results - Lloyd's Syndicate

Our Lloyd's Syndicate segment includes operating results from our participation in Lloyd's of London. We have a total capital commitment to support our Lloyd's Syndicate operations through 2022 of up to $200 million. For the 2018 underwriting year, we have satisfied our capital commitment with investment securities deposited with Lloyd's (also referred to as FAL) which at March 31, 2018 had a fair value of approximately $123.9 million, as discussed in Note 3 of the Notes to Condensed Consolidated Financial Statements.

We normally report results from our involvement in Lloyd's Syndicates on a quarter delay, except when information is available that is material to the current period. Furthermore, the investment results associated with our FAL investments and certain U.S. paid administrative expenses are reported concurrently as that information is available on an earlier time frame.

Lloyd's Syndicate 1729

We are the majority (58%) capital provider to Syndicate 1729, which covers a range of property and casualty insurance and reinsurance lines. The remaining capital for Syndicate 1729 is provided by unrelated third parties, including private names and other corporate members. Syndicate 1729 has a maximum underwriting capacity of £132.0 million for the 2018 underwriting year, of which £82.0 million ($114.9 million based on March 31, 2018 exchange rates) is our allocated underwriting capacity. For the 2018 underwriting year, we increased our participation in the operating results of Syndicate 1729 from 58% to 62% and are satisfying our capital commitment to support Syndicate 1729 with our FAL securities, as discussed above. Due to the quarter delay, our increased participation in the operating results of Syndicate 1729 will not be reflected in our Lloyd's Syndicate segment results until the second quarter of 2018.

Lloyd's Syndicate 6131

Beginning in the second quarter of 2018, our Lloyd's Syndicate segment will include the operating results of a newly formed SPA, Syndicate 6131, which began writing business effective January 1, 2018. As a SPA, Syndicate 6131 is only allowed to underwrite one quota share reinsurance contract with Syndicate 1729. We are the sole (100%) capital provider to Syndicate 6131 and are satisfying our capital commitment with our FAL securities, as previously discussed. Syndicate 6131 has a maximum underwriting capacity of £8.0 million ($11.2 million based on March 31, 2018 exchange rates) for the 2018 underwriting year and will focus on contingency and specialty property business.

For the three months endedMarch 31, 2018 and 2017, our Lloyd's Syndicate segment results include both our 58% participation in the operating results of Syndicate 1729 and 100% of the operating results of our wholly owned subsidiaries that support our Lloyd's Syndicates and were composed as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Gross premiums written	$	12,361		$	12,713		$	(352	)	(2.8	%)
Ceded premiums written	(520		)	(1,353		)	833			(61.6	%)
Net premiums written	$	11,841		$	11,360		$	481		4.2	%
Net premiums earned	$	12,476		$	14,562		$	(2,086	)	(14.3	%)
Net investment income	751			372			379			101.9	%
Net realized gains (losses)	(54		)	27			(81		)	(300.0	%)
Other income	331			391			(60		)	(15.3	%)
Net losses and loss adjustment expenses	(8,486		)	(9,507		)	1,021			(10.7	%)
Underwriting, policy acquisition and operating expenses	(7,246		)	(6,211		)	(1,035		)	16.7	%
Income tax benefit (expense)	(6		)	7			(13		)	(185.7	%)
Segment operating results	$	(2,234	)	$	(359	)	$	(1,875	)	522.3	%
Net loss ratio	68.0		%	65.3		%	2.7			pts
Underwriting expense ratio	58.1		%	42.7		%	15.4			pts

Premiums Written

Gross premiums written in 2018 consisted of casualty coverages (42% of total gross premiums written), property insurance coverages (47%), property reinsurance coverages (10%) and catastrophe reinsurance coverages (1%). Gross premiums written decreased during the 2018three-month period as compared to the same respective period of 2017 primarily due to retention losses on certain casualty insurance and reinsurance accounts, largely offset by new business written.

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As discussed in our Specialty P&C segment operating results, Syndicate 1729 serves as a reinsurer on a quota share basis for a wholly owned insurance subsidiary in our Specialty P&C segment. For premiums assumed, we include in gross premiums written an estimate of all premiums to be earned over the entire period covered by the reinsurance agreement, generally one year, in the quarter in which the reinsurance agreement becomes effective. The quota share agreement with our Specialty P&C segment renewed effective January 1, 2017 and reflected revised contract terms which reduced premiums assumed by Syndicate 1729 by essentially half. Results from this ceding arrangement are reported in the Specialty P&C segment on the same quarter delay in order to be consistent with the Lloyd's Syndicate segment as the effect of doing so is not material. Syndicate 1729 did not renew the quota share agreement with our Specialty P&C segment on January 1, 2018; however, the impact will not be reflected in either segment's operating results until the second quarter of 2018 due to the previously mentioned quarter delay.

The 2016 and 2015 calendar year quota share arrangements with our Specialty P&C segment were commuted in December 2017 and 2016, respectively. Due to the quarter delay, the effect of the 2016 and 2015 commutation was reported by both segments in results during the first quarters of 2018 and 2017, respectively, and is reflected in the three months endedMarch 31, 2018 and 2017, respectively. The commutations did not differ significantly from previously recorded amounts.

Net Premiums Earned

Net premiums earned consist of gross premiums earned less the portion of earned premiums that we cede to our reinsurers for their assumption of a portion of our losses. Policies written to date primarily carry a term of one year. Because premiums are generally earned pro rata over the entire policy period, fluctuations in premiums earned tend to lag those of premiums written. Additionally, premiums for certain policies and assumed reinsurance contracts are reported subsequent to the coverage period and/or may be subject to adjustment based on loss experience. These premium adjustments are earned when reported, which can result in further fluctuation in earned premium. The decrease in net premiums earned of $2.1 million for the three months endedMarch 31, 2018 was driven by an increase in ceded premiums earned which primarily reflected the effect of higher ceded premiums written in the preceding twelve months due to a revision in our reinsurance agreements at the beginning of 2017.

Net premiums earned for the three months endedMarch 31, 2018 and 2017 included premium assumed from our Specialty P&C segment of approximately $1.9 million and $3.5 million, respectively.

Net Losses and Loss Adjustment Expenses

Losses for the period were primarily recorded using the loss assumptions by risk category incorporated into the business plan submitted to Lloyd's for Syndicate 1729 with consideration given to loss experience incurred to date. The assumptions used in the business plan were consistent with loss results reflected in Lloyd's historical data for similar risks. We expect loss ratios to fluctuate from quarter to quarter as Syndicate 1729 writes more business and the book begins to mature. The loss ratios will also fluctuate due to the timing of earned premium adjustments (see discussion in this section under the heading "Net Premiums Earned"). Premium and exposure for some of Syndicate 1729's insurance policies and reinsurance contracts are initially estimated and subsequently adjusted over an extended period of time as underlying premium reports are received from cedants and insureds. When reports are received, the premium, exposure and corresponding loss estimates are revised accordingly. Changes in loss estimates due to premium or exposure fluctuations are incurred in the accident year in which the premium is earned.

The net loss ratio increased by 2.7% for the three months endedMarch 31, 2018 as compared to the same respective period of 2017. The increase in the net loss ratio was driven by the effect of a decrease in net premiums earned, as discussed above, and, to a lesser extent, the impact of a reduction in net favorable prior year development. The reduction in net favorable prior year development was driven by higher than expected losses and development on certain large claims in the current period related to prior year reserves which resulted in unfavorable development with respect to the previous year of account.

Underwriting, Policy Acquisition and Operating Expenses

Underwriting, policy acquisition and operating expenses increased by $1.0 million for the three months endedMarch 31, 2018 as compared to the same period in 2017 primarily due to the anticipated growth in Syndicate 1729 operations and an increase in various operational expenses associated with establishing Syndicate 6131. As operations have grown and matured, the number of employees and associated underwriting salaries have increased. The increase in the expense ratio for the 2018three-month period was primarily driven by the effect of a decrease in net premiums earned, as discussed above, and the additional operating expenses associated with Syndicate 6131.

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Net Investment Income

Net investment income for the 2018 and 2017three-month periods was primarily attributable to interest earned on our FAL investments, which primarily includes investment-grade corporate debt securities. In the fourth quarter of 2017, Syndicate 1729 expanded its fixed maturities portfolio to include certain debt securities classified as trading securities. Investment results associated with these fixed maturity trading securities are reported on the same quarter delay.

Taxes

Operating results of this segment are subject to U.K. income tax law.

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Segment Operating Results - Corporate

Our Corporate segment includes investment operations, interest expense and U.S. income taxes, all of which are managed at the corporate level with the exception of investment assets solely allocated to Lloyd's Syndicate operations as discussed in Note 12 of the Notes to Condensed Consolidated Financial Statements. Our Corporate segment operating results also reflect non-premium revenues generated outside of our insurance entities and corporate expenses. Segment operating results for our Corporate segment were net earnings of $6.6 million and $25.6 million for the three months endedMarch 31, 2018 and 2017, respectively, and included the following:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Net investment income	$	21,276		$	22,814		$	(1,538	)	(6.7	%)
Equity in earnings (loss) of unconsolidated subsidiaries	$	1,640		$	1,808		$	(168	)	(9.3	%)
Net realized gains (losses)	$	(12,463	)	$	13,253		$	(25,716	)	(194.0	%)
Operating expense	$	4,678		$	8,315		$	(3,637	)	(43.7	%)
Segregated portfolio cells dividend expense (income) (1)	$	(117	)	$	1,229		$	(1,346	)	(109.5	%)
Interest expense	$	3,705		$	4,133		$	(428	)	(10.4	%)
Income tax expense (benefit)	$	(3,428	)	$	(1,217	)	$	(2,211	)	(181.7	%)
(1) Represents the investment results attributable to the SPCs at our Cayman Islands reinsurance subsidiaries.

Net Investment Income, Equity in Earnings (Loss) of Unconsolidated Subsidiaries, Net Realized Investment Gains (Losses)

Net Investment Income

Net investment income is primarily derived from the income earned by our fixed maturity securities and also includes dividend income from equity securities, income from our short-term and cash equivalent investments, earnings from other investments and increases in the cash surrender value of BOLI contracts. Investment fees and expenses are deducted from investment income.

Net investment income by investment category was as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Fixed maturities	$	16,391		$	19,725		$	(3,334	)	(16.9	%)
Equities	4,867			3,644			1,223			33.6	%
Short-term investments, including Other	1,220			778			442			56.8	%
BOLI	449			455			(6		)	(1.3	%)
Investment fees and expenses	(1,651		)	(1,788		)	137			(7.7	%)
Net investment income	$	21,276		$	22,814		$	(1,538	)	(6.7	%)

Fixed Maturities

The decrease in our investment income from fixed maturity securities for the 2018three-month period was due to lower average investment balances. We reduced the size of our fixed maturity portfolio over the last year in order to pay dividends and invest in other asset classes. On an overall basis, our average investment in fixed maturity securities was approximately 17% lower for the 2018three-month period as compared to the same period in 2017.

Average yields for our fixed maturity portfolio were as follows:

	Three Months Ended March 31
	2018	2017
Average income yield	3.2%	3.2%
Average tax equivalent income yield	3.3%	3.6%

Equities

Income from our equity portfolio increased during the 2018three-month period as compared to the same period in 2017 which reflected an increase to our allocation to this asset category as well as a different mix of equities owned.

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Other Investments and Short-term Investments

Income from our other investments and short-term investments increased during the 2018three-month period as compared to the same period in 2017 primarily due to higher reported earnings from our short-term investment holdings. Short-term investments, which have a maturity at purchase of one year or less, are reported at cost, which approximates fair value, and are primarily composed of investments in U.S. treasury obligations, commercial paper and money market funds.

Equity in Earnings (Loss) of Unconsolidated Subsidiaries

Equity in earnings (loss) of unconsolidated subsidiaries was as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
All other investments, primarily investment fund LPs/LLCs	$	7,616		$	5,533		$	2,083		37.6	%
Tax credit partnerships	(5,976		)	(3,725		)	(2,251		)	60.4	%
Equity in earnings (loss) of unconsolidated subsidiaries	$	1,640		$	1,808		$	(168	)	(9.3	%)

We hold interests in certain LPs/LLCs that generate earnings from trading portfolios, secured debt, debt securities, multi-strategy funds and private equity investments. The performance of the LPs/LLCs is affected by the volatility of equity and credit markets. For our investments in LPs/LLCs, we record our allocable portion of the partnership operating income or loss as the results of the LPs/LLCs become available. Our investment results from our portfolio of investments in LPs/LLCs for the 2018three-month period were affected primarily by our share of higher reported earnings from one LP investment.

Our tax credit investments are designed to generate returns in the form of tax credits and tax-deductible project operating losses and are comprised of qualified affordable housing project tax credit partnership interests and historic tax credit interests. We account for our tax credit investments under the equity method and record our allocable portion of the operating losses of the underlying properties based on estimates provided by the partnerships. For our qualified affordable housing project tax credit partnership interests, we adjust our estimates of our allocable portion of operating losses periodically as actual operating results of the underlying properties become available. Our historic tax credit investments are short-term in nature and remaining operating losses are expected to be recognized primarily in 2018. The results from our tax credit partnerships for the three months endedMarch 31, 2018 reflected an increase in partnership operating losses as compared to the same period of 2017.

The tax benefits received from our tax credit partnerships, which are not reflected in our investment results above, reduced our tax expenses in 2018 and 2017 as follows:

	Three Months Ended March 31
(In millions)	2018		2017
Tax credits recognized during the period	$	5.3	$	6.4
Tax benefit of tax credit partnership operating losses	$	1.3	$	1.3

Tax credits provided by the underlying projects of the historic tax credit partnerships are typically available in the tax year in which the project is put into active service, whereas the tax credits provided by qualified affordable housing project tax credit partnerships are provided over approximately a ten year period. The decrease in tax credits recognized for the three months endedMarch 31, 2018 was primarily attributable to our historic tax credit partnership investments.

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Non-GAAP Financial Measure – Tax Equivalent Investment Result

We believe that to fully understand our investment returns it is important to consider the current tax benefits associated with certain investments as the tax benefit received represents a portion of the return provided by our tax-exempt bonds, BOLI, common and preferred stocks, and tax credit partnership investments (our tax-preferred investments). We impute a pro forma tax-equivalent result by estimating the amount of fully-taxable income needed to achieve the same after-tax result as is currently provided by our tax-preferred investments. We believe this better reflects the economics behind our decision to invest in certain asset classes that are either taxed at lower rates and/or result in reductions to our current federal income tax expense. Our pro forma tax-equivalent investment result is shown in the table that follows as well as a reconciliation of our GAAP net investment result to our tax equivalent result.

	Three Months Ended March 31
(In thousands)	2018		2017
GAAP net investment result:
Net investment income	$	21,276	$	22,814
Equity in earnings (loss) of unconsolidated subsidiaries	1,640		1,808
GAAP net investment result	$	22,916	$	24,622
Pro forma tax-equivalent investment result	$	30,749	$	37,971
Reconciliation of pro forma and GAAP tax-equivalent investment result:
GAAP net investment result	$	22,916	$	24,622
Taxable equivalent adjustments, calculated using the 21% and 35% federal statutory tax rate for 2018 and 2017, respectively:
State and municipal bonds	698		2,498
BOLI	119		245
Dividends received	339		734
Tax credit partnerships	6,677		9,872
Pro forma tax-equivalent investment result	$	30,749	$	37,971

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Net Realized Investment Gains (Losses)

The following table provides detailed information regarding our Net realized investment gains (losses).

	Three Months Ended March 31
(In thousands)	2018			2017
OTTI losses, total:
Corporate debt	$	—		$	(419	)
Portion of OTTI losses recognized in other comprehensive income before taxes:
Corporate debt	—			248
Net impairment losses recognized in earnings	—			(171		)
Gross realized gains, available-for-sale fixed maturities	4,464			1,842
Gross realized (losses), available-for-sale fixed maturities	(2,042		)	(66		)
Net realized gains (losses), equity investments	9,219			6,562
Net realized gains (losses), other investments	688			1,172
Change in unrealized holding gains (losses), equity investments	(23,845		)	3,599
Change in unrealized holding gains (losses), convertible securities, carried at fair value as a part of other investments	(954		)	313
Other	7			2
Net realized investment gains (losses)	$	(12,463	)	$	13,253

We did not recognize any OTTI during the 2018three-month period. For the 2017three-month period, we recognized OTTI in earnings of $0.2 million and $0.2 million in non-credit impairments in OCI both of which related to corporate bonds.

Operating Expenses

Corporate segment operating expenses were comprised as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017			Change
Operating expenses	$	8,637		$	12,135		$	(3,498	)	(28.8	%)
Management fee offset	(3,959		)	(3,820		)	(139		)	3.6	%
Segment Total	$	4,678		$	8,315		$	(3,637	)	(43.7	%)

The decrease in operating expenses for the three months endedMarch 31, 2018 was primarily driven by a decrease in share-based compensation expenses and other compensation related costs and, to a lesser extent, a decrease in professional fees as compared to the same respective period of 2017. The decrease in share-based compensation expense in the 2018 three-month period was attributable to fewer awards outstanding and an adjustment of the projected award value based upon the decline, in the quarter, of one of the performance metrics associated with a particular year's award.

Operating subsidiaries within our Specialty P&C and Workers' Compensation segments are charged a management fee by the Corporate segment for services provided to these subsidiaries. The management fee is based on the extent to which services are provided to the subsidiary and the amount of premium written by the subsidiary. Under the arrangement, the expenses associated with such services are reported as expenses of the Corporate segment, and the management fees charged are reported as an offset to Corporate operating expenses. While the terms of the management arrangement were consistent between 2017 and 2018, fluctuations in the amount of premium written by each subsidiary can result in corresponding variations in the management fee charged to each subsidiary during a particular period.

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Segregated Portfolio Cell Dividend Expense (Income)

We report in the Corporate segment the portion of the SPC dividend expense (income) that is attributable to the investment results of the SPCs to align the expense (income) with the related investment results of the SPCs, all of which are reported in the Corporate segment. See more information on our SPCs under the heading "Underwriting, Policy Acquisition and Operating Expenses" in the Segment Operating Results - Workers' Compensation section. The portion of the SPC dividend expense (income) reported in the Corporate segment was as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017		Change
SPC dividend expense (income)	$	(117	)	$	1,229	$	(1,346	)	(109.5	%)

Interest Expense

Interest expense for three months endedMarch 31, 2018 and 2017 was comprised as follows:

	Three Months Ended March 31
($ in thousands)	2018			2017		Change
Senior Notes due 2023	$	3,357		$	3,357	$	—		—	%
Revolving Credit Agreement (including fees and amortization)	607			767		(160		)	(20.9	%)
Mortgage Loans (including amortization)	306			—		306			nm
(Gain)/loss on interest rate cap	(575		)	—		(575		)	nm
Other	10			9		1			11.1	%
Interest expense	$	3,705		$	4,133	$	(428	)	(10.4	%)

Interest expense decreased during the three months endedMarch 31, 2018 driven by the change in the fair value of our interest rate cap. The interest rate cap was entered into during the fourth quarter of 2017 and is designated as an economic hedge of interest rate risk associated with our variable rate Mortgage Loans. Excluding the impact of the change in the fair value of our interest rate cap, interest expense increased during the three months endedMarch 31, 2018 as compared to the same three-month period of 2017. The increase was attributable to interest expense incurred on our Mortgage Loans during the three months endedMarch 31, 2018, partially offset by lower interest expense on our Revolving Credit Agreement due to a decrease in our weighted average outstanding borrowings, which were $103 million for the 2018three-month period as compared to $200 million for the 2017three-month period. See further discussion of our outstanding debt in Note 7 and further discussion of our interest rate cap agreement in Note 8 of the Notes to Condensed Consolidated Financial Statements.

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Taxes

Tax expense allocated to our Corporate segment includes U.S. tax only, which would include U.S. tax expense incurred from our corporate membership in Lloyd's of London. The U.K. tax expense incurred by the U.K. based subsidiaries of our Lloyd's Syndicate segment is allocated to that segment. Consolidated tax expense reflects tax expense of both segments, as shown in the table below:

	Three Months Ended March 31
(In thousands)	2018			2017
Corporate segment income tax expense (benefit)	$	(3,428	)	$	(1,217	)
Lloyd's Syndicate segment income tax expense (benefit)	6			(7		)
Consolidated income tax expense (benefit)	$	(3,422	)	$	(1,224	)

Factors affecting our consolidated effective tax rate include the following:

	Three Months Ended March 31
	2018		2017
Statutory rate (1)	21.0	%	35.0	%
Tax-exempt income (2)	(11.8	%)	(7.1	%)
Tax credits	(62.5	%)	(23.0	%)
Non-U.S. operating results	5.5	%	—	%
Excess tax benefit on share-based compensation	(0.5	%)	(5.8	%)
Other	7.7	%	(2.1	%)
Effective tax rate	(40.6	%)	(3.0	%)
(1) Effective January 1, 2018, the corporate statutory tax rate changed from 35% to 21% as a result of tax reform enacted by the TCJA.
(2) Includes tax-exempt interest, dividends received deduction and change in cash surrender value of BOLI.

The provision (benefit) for income taxes and the effective tax rate for the 2018 and 2017three-month periods are determined based upon our current estimate of our annual effective tax rate at the end of each quarterly reporting period (the projected annual effective tax rate) plus the impact of certain discrete items that are not included in the projected annual effective tax rate. Our projected annual effective tax rates for 2018 and 2017 were a benefit of 2.4% and an expense of 4.8% at March 31, 2018 and 2017, respectively, before those certain discrete items were considered. Our projected annual effective tax rates for both the 2018 and 2017three-month periods were different from the statutory federal income tax rate primarily due to a portion of our investment income being tax-exempt and the utilization of tax credits transferred to us from our tax credit partnership investments. Tax credits utilized were $5.3 million and $6.4 million for the three months endedMarch 31, 2018 and 2017, respectively. The effect of the lower statutory federal income tax rate as a result of the TCJA and our ability to utilize these tax credits in the current tax year and previous tax year through carryback provisions of the tax law resulted in our projected annual effective tax rate of a benefit of 2.4% at March 31, 2018. While projected tax credits for 2018 are less than 2017, they continue to have a significant impact on the effective tax rate for the 2018three-month period.

Our effective tax rates for the 2018 and 2017three-month periods was a benefit of 40.6% and 3.0%, respectively, and differs from the projected annual effective tax rates due to certain discrete items. These discrete items reduced our projected annual effective tax rates by 38.2% and 7.8% for the 2018 and 2017three-month periods, respectively.

For the 2018three-month period, the most significant discrete item that decreased our effective tax rate was the treatment of net realized investment losses. Our calculation of our projected annual effective tax rate during interim periods has historically included an estimate of annual net realized investment gains and losses based on year-to-date results. Due to the recent volatility in the securities markets, we believe that projections for changes in net realized investment gains and losses during the year cannot be reliably estimated and could cause a significant distortion in the projected annual effective tax rate. Therefore, beginning in the first quarter of 2018, net realized investment gains and losses are treated as discrete items and reflected in the effective tax rate in the period in which they are included in income. This treatment of net realized investment losses of $12.5 million for the three months endedMarch 31, 2018 accounted for 34.7% of the 38.2% reduction in the projected annual effective tax rate due to discrete items.

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For the 2017three-month period, the most significant discrete item related to the treatment of a share-based compensation windfall due to the adoption of new accounting guidance in the first quarter of 2017, which lowered the effective tax rate by 5.8%.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK.

We believe that we are principally exposed to three types of market risk related to our investment operations. These risks are interest rate risk, credit risk and equity price risk. We are also exposed to interest rate risk related to our variable rate Mortgage Loans and Revolving Credit Agreement. We have limited exposure to foreign currency risk as we issue few insurance contracts denominated in currencies other than the U.S. dollar and we have few monetary assets or obligations denominated in foreign currencies.

Interest Rate Risk

Investments

Our fixed maturities portfolio is exposed to interest rate risk. Fluctuations in interest rates have a direct impact on the market valuation of these securities. As interest rates rise, market values of fixed income portfolios fall and vice versa. Certain of the securities are held in an unrealized loss position; we do not intend to sell and believe we will not be required to sell any of the debt securities held in an unrealized loss position before its anticipated recovery.

The following tables summarize estimated changes in the fair value of our available-for-sale fixed maturity securities for specific hypothetical changes in interest rates by asset class at March 31, 2018 and December 31, 2017. There are principally two factors that determine interest rates on a given security: market interest rates and credit spreads. As different asset classes can be affected in different ways by movements in those two factors, we have separated our portfolio by asset class in the following tables.

	Interest Rate Shift in Basis Points
	March 31, 2018
($ in millions)	(200)		(100)		Current		100		200
Fair Value:
Fixed maturities, available for sale:
U.S. Treasury obligations	$	138	$	134	$	130	$	126	$	122
U.S. Government-sponsored enterprise obligations	31		31		30		29		27
State and municipal bonds	353		341		330		319		308
Corporate debt	1,359		1,313		1,248		1,225		1,184
Asset-backed securities	439		428		416		400		385
Total fixed maturities, available for sale	$	2,320	$	2,247	$	2,154	$	2,099	$	2,026
Duration:
Fixed maturities, available for sale:
U.S. Treasury obligations	3.11		3.02		2.94		2.87		2.79
U.S. Government-sponsored enterprise obligations	1.31		1.73		3.92		4.87		5.23
State and municipal bonds	3.39		3.37		3.39		3.47		3.57
Corporate debt	3.47		3.44		3.47		3.45		3.41
Asset-backed securities	2.17		2.72		3.40		3.80		3.97
Total fixed maturities, available for sale	3.16		3.24		3.42		3.50		3.53

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	Interest Rate Shift in Basis Points
	December 31, 2017
($ in millions)	(200)		(100)		Current		100		200
Fair Value:
Fixed maturities, available for sale:
U.S. Treasury obligations	$	142	$	138	$	134	$	130	$	126
U.S. Government-sponsored enterprise obligations	22		21		21		20		19
State and municipal bonds	683		657		632		609		585
Corporate debt	1,249		1,208		1,167		1,128		1,090
Asset-backed securities	341		335		326		315		302
Total fixed maturities, available for sale	$	2,437	$	2,359	$	2,280	$	2,202	$	2,122
Duration:
Fixed maturities, available for sale:
U.S. Treasury obligations	3.11		3.02		2.94		2.86		2.79
U.S. Government-sponsored enterprise obligations	1.38		1.34		3.59		4.58		4.87
State and municipal bonds	3.83		3.79		3.78		3.80		3.85
Corporate debt	3.37		3.33		3.38		3.38		3.34
Asset-backed securities	1.72		2.21		3.15		3.89		4.24
Total fixed maturities, available for sale	3.23		3.26		3.43		3.55		3.59

Computations of prospective effects of hypothetical interest rate changes are based on numerous assumptions, including the maintenance of the existing level and composition of fixed income security assets, and should not be relied on as indicative of future results.

Certain shortcomings are inherent in the method of analysis presented in the computation of the fair value of fixed rate instruments. Actual values may differ from the projections presented should market conditions vary from assumptions used in the calculation of the fair value of individual securities, including non-parallel shifts in the term structure of interest rates and changing individual issuer credit spreads.

At March 31, 2018, our fixed maturities portfolio includes an immaterial amount of fixed maturities classified as trading securities. Because these trading securities are immaterial, there is not a significant amount of exposure to market interest rates or credit spreads.

Our cash and short-term investment portfolio at March 31, 2018 was carried on a cost basis which approximates its fair value. Our cash and short-term investments portfolio lacks significant interest rate sensitivity due to its short duration.

Debt

Our variable interest rate Mortgage Loans are exposed to interest rate risk. However, a 100 basis point change in LIBOR will not materially impact our annualized interest expense. Additionally, we have economically hedged the risk of a change in interest rates in excess of 100 basis points on the Mortgage Loans through the purchase of an interest rate cap derivative instrument, which effectively caps our annual interest rate on the Mortgage Loans at a maximum of 367.5 basis points (see Note 8 of the Notes to Condensed Consolidated Financial Statements for additional information). The fair value of the interest rate cap is not materially impacted by a 100 basis point change in LIBOR, however, the carrying value of the interest rate cap is impacted by future expectations for LIBOR as well as estimations of volatility in the future yield curve.

Our Revolving Credit Agreement is exposed to interest rate risk as it is LIBOR based and a 100 basis point change in LIBOR will impact annual interest expense only to the extent that there is an outstanding balance. For every $100 million drawn on our Revolving Credit Agreement, a 100 basis point change in interest rates will change our annual interest expense by $1 million. Any outstanding balances on the Revolving Credit Agreement can be repaid on each maturity date, which has typically ranged from one to three months.

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Credit Risk

We have exposure to credit risk primarily as a holder of fixed income securities. We control this exposure by emphasizing investment grade credit quality in the fixed income securities we purchase.

As of March 31, 2018, 94% of our fixed maturity securities were rated investment grade as determined by NRSROs, such as Fitch, Moody’s and Standard & Poor’s. We believe that this concentration in investment grade securities reduces our exposure to credit risk on our fixed income investments to an acceptable level. However, investment grade securities, in spite of their rating, can rapidly deteriorate and result in significant losses. Ratings published by the NRSROs are one of the tools used to evaluate the credit worthiness of our securities. The ratings reflect the subjective opinion of the rating agencies as to the credit worthiness of the securities, and therefore, we may be subject to additional credit exposure should the rating prove to be unreliable.

We also have exposure to credit risk related to our receivables from reinsurers. Our receivables from reinsurers (with regard to both paid and unpaid losses) approximated $342 million at March 31, 2018 and $343 million at December 31, 2017. We monitor the credit risk associated with our reinsurers using publicly available financial and rating agency data.

Equity Price Risk

At March 31, 2018, the fair value of our equity investments, excluding our equity investments in bond investment funds as discussed in the following paragraph, was $319 million. These equity securities are subject to equity price risk, which is defined as the potential for loss in fair value due to a decline in equity prices. The weighted average beta of this group of securities was 0.94. Beta measures the price sensitivity of an equity security or group of equity securities to a change in the broader equity market, in this case the S&P 500 Index. If the value of the S&P 500 Index increased by 10%, the fair value of these securities would be expected to increase by 9.4% to $349 million. Conversely, a 10% decrease in the S&P 500 Index would imply a decrease of 9.4% in the fair value of these securities to $289 million. The selected hypothetical changes of plus or minus 10% do not reflect what could be considered the best or worst case scenarios and are used for illustrative purposes only.

Our equity investments include equity investments in certain bond investment funds which are not significantly subject to equity price risk, and thus we have excluded these investments from the above analysis.

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ITEM 4. CONTROLS AND PROCEDURES.

The Chief Executive Officer and Chief Financial Officer of the Company participated in management’s evaluation of our disclosure controls and procedures (as defined in SEC Rule 13a-15(e)) as of March 31, 2018. ProAssurance’s disclosure controls and procedures are designed to reasonably assure that information required to be disclosed by us in reports we file or submit under the Exchange Act is accumulated and communicated to our management as appropriate to allow timely decisions regarding disclosure and is recorded, processed, summarized and reported within the time periods specified in the Securities and Exchange Commission’s rules and forms. Based on that evaluation, the Chief Executive Officer and Chief Financial Officer have concluded that our disclosure controls and procedures are effective.

Changes in Internal Control over Financial Reporting

There have been no significant changes in our internal controls over financial reporting that have materially affected, or are reasonably likely to materially affect, those controls during the quarter.

PART II. OTHER INFORMATION

ITEM 1. LEGAL PROCEEDINGS.

See Note 6 of the Notes to Condensed Consolidated Financial Statements.

ITEM 1A. RISK FACTORS.

There are no changes to the "Risk Factors" in Part 1, Item 1A of the 2017 Form 10-K.

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

(a) Not applicable.

(b) Not applicable.

(c) Information required by Item 703 of Regulation S-K.

Period	Total Number of Shares Purchased	Average Price Paid per Share	Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs	Approximate Dollar Value of Shares that May Yet Be Purchased Under the Plans or Programs* (In thousands)
January 1 - 31, 2018	—	N/A	—	$109,643
February 1 - 28, 2018	—	N/A	—	$109,643
March 1 - 31, 2018	—	N/A	—	$109,643
Total	—	$—	—

* Under its current plan begun in November 2010, the Board has authorized $600 million for the repurchase of common shares or the retirement of outstanding debt. This is ProAssurance’s only plan for the repurchase of common shares, and the plan has no expiration date.

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ITEM 6. EXHIBITS

Exhibit Number	Description
31.1	Certification of Principal Executive Officer of ProAssurance as required under SEC rule 13a-14(a).
31.2	Certification of Principal Financial and Accounting Officer of ProAssurance as required under SEC rule 13a-14(a).
32.1	Certification of Principal Executive Officer of ProAssurance as required under SEC Rule 13a-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, as amended (18 U.S.C. 1350).
32.2	Certification of Principal Financial and Accounting Officer of ProAssurance as required under SEC Rule 13a-14(b) and Section 1350 of Chapter 63 of Title 18 of the United States Code, as amended (18 U.S.C. 1350).
101.INS	XBRL Instance Document
101.SCH	XBRL Taxonomy Extension Schema Document
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document
101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
101.LAB	XBRL Taxonomy Extension Labels Linkbase Document
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

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SIGNATURE

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.

PROASSURANCE CORPORATION

May 3, 2018

/s/    Edward L. Rand, Jr.

Edward L. Rand, Jr.

Chief Operating Officer and Chief Financial Officer

(Duly authorized officer and principal financial officer)

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EX-31.1

Exhibit 31.1

CERTIFICATION

I, W. Stancil Starnes, certify that:

1. I have reviewed this report on Form 10-Q of ProAssurance Corporation;

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 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: May 3, 2018

/s/ W. Stancil Starnes

W. Stancil Starnes

Chief Executive Officer

EX-31.2

Exhibit 31.2

CERTIFICATION

I, Edward L. Rand, Jr., certify that:

1. I have reviewed this report on Form 10-Q of ProAssurance Corporation;

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 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: May 3, 2018

/s/ Edward L. Rand, Jr.

Edward L. Rand, Jr.

Chief Operating Officer and Chief Financial Officer

EX-32.1

Exhibit 32.1

A signed original of this written statement required by Section 906 has been provided to ProAssurance Corporation and will be retained by ProAssurance Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of ProAssurance Corporation (the “Company”) on Form 10-Q for the quarter ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, W. Stancil Starnes, Chief Executive Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ W. Stancil Starnes

W. Stancil Starnes

Chief Executive Officer

May 3, 2018

EX-32.2

Exhibit 32.2

A signed original of this written statement required by Section 906 has been provided to ProAssurance Corporation and will be retained by ProAssurance Corporation and furnished to the Securities and Exchange Commission or its staff upon request.

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350,

AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of ProAssurance Corporation (the “Company”) on Form 10-Q for the quarter ending March 31, 2018 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Edward L. Rand, Jr., Chief Financial Officer of the Company, certify, pursuant to 18 U.S.C. § 1350, as adopted pursuant to § 906 of the Sarbanes-Oxley Act of 2002, that:

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

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

/s/ Edward L. Rand, Jr.

Edward L. Rand, Jr.

Chief Operating Officer and Chief Financial Officer

May 3, 2018

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Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 30, 2018
Document and Entity Information [Abstract]
Entity Registrant Name	PROASSURANCE CORP
Entity Central Index Key	0001127703
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q1
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,593,712

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Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Investments
Fixed maturities, at fair value; cost or amortized cost, $2,169,546 and $2,257,188, respectively	$ 2,157,831	$ 2,280,242
Equity investments, at fair value; cost, $471,337 and $425,942, respectively	492,159	470,609
Short-term investments	349,119	432,126
Business owned life insurance	62,562	62,113
Investment in unconsolidated subsidiaries	401,030	330,591
Other investments, $33,042 and $52,301 at fair value, respectively, otherwise at cost or amortized cost	35,944	110,847
Total Investments	3,498,645	3,686,528
Cash and cash equivalents	43,247	134,495
Premiums receivable	247,644	238,085
Receivable from reinsurers on paid losses and loss adjustment expenses	12,935	7,317
Receivable from reinsurers on unpaid losses and loss adjustment expenses	329,540	335,585
Prepaid reinsurance premiums	39,899	39,916
Deferred policy acquisition costs	50,765	50,261
Deferred tax asset, net	16,874	9,930
Real estate, net	31,646	31,975
Intangible assets, net	81,408	82,952
Goodwill	210,725	210,725
Other assets	115,596	101,428
Total Assets	4,678,924	4,929,197
Policy liabilities and accruals
Reserve for losses and loss adjustment expenses	2,056,801	2,048,381
Unearned premiums	426,627	398,884
Reinsurance premiums payable	46,933	37,726
Total Policy Liabilities	2,530,361	2,484,991
Other liabilities	207,866	437,600
Debt less debt issuance costs	371,528	411,811
Total Liabilities	3,109,755	3,334,402
Shareholders' Equity
Common shares, par value $0.01 per share, 100,000,000 shares authorized, 62,960,615 and 62,824,523 shares issued, respectively	630	628
Additional paid-in capital	380,250	383,077
Accumulated other comprehensive income (loss), net of deferred tax expense (benefit) of ($1,842) and $5,218, respectively	(8,046)	14,911
Retained earnings	1,614,344	1,614,186
Treasury shares, at cost, 9,367,545 shares and 9,367,502 shares, respectively	(418,009)	(418,007)
Total Shareholders' Equity	1,569,169	1,594,795
Total Liabilities and Shareholders' Equity	$ 4,678,924	$ 4,929,197

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Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Marketable securities, amortized cost	$ 2,169,546	$ 2,257,188
Equity Investments, fair value, cost	471,337	425,942
Other investments, portion carried at fair value	$ 33,042	$ 52,301
Common shares, par value (USD per share)	$ 0.01	$ 0.01
Common shares, shares authorized (in shares)	100,000,000	100,000,000
Common shares, shares issued (in shares)	62,960,615	62,824,523
Deferred tax expense (benefit) on accumulated other comprehensive income (loss)	$ (1,842)	$ 5,218
Treasury shares, number of shares (in shares)	9,367,545	9,367,502

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Condensed Consolidated Statements of Changes in Capital (Unaudited) - USD ($)		3 Months Ended
		Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017	Dec. 31, 2016
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		$ 1,594,795,000	$ 1,798,702,000
Common shares issued for compensation and effect of shares reissued to stock purchase plan		120,000	940,000
Share-based compensation		902,000	3,346,000
Net effect of restricted and performance shares issued		(3,849,000)	(5,314,000)
Dividends to shareholders		(16,616,000)	(16,516,000)
Other comprehensive income (loss)		(26,373,000)	2,924,000
Net income		11,856,000	41,455,000
Ending Balance		1,569,169,000	1,825,686,000
Accounting Standards Update 2016-01
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]			$ 8,334,000
Accounting Standards Update 2016-09
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]				$ 149,000
Common Stock
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		628,000	627,000
Net effect of restricted and performance shares issued		2,000	1,000
Ending Balance		630,000	628,000
Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		383,077,000	376,518,000
Common shares issued for compensation and effect of shares reissued to stock purchase plan		122,000	938,000
Share-based compensation		902,000	3,346,000
Net effect of restricted and performance shares issued		(3,851,000)	(5,315,000)
Ending Balance		380,250,000	375,912,000
Additional Paid-in Capital | Accounting Standards Update 2016-09
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]				425,000
Accumulated Other Comprehensive Income (Loss)
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		14,911,000	17,399,000
Other comprehensive income (loss)		(26,373,000)	2,924,000
Ending Balance		(8,046,000)	20,323,000
Accumulated Other Comprehensive Income (Loss) | Accounting Standards Update 2018-02
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]			3,416,000
Retained Earnings
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		1,614,186,000	1,824,088,000
Dividends to shareholders		(16,616,000)	(16,516,000)
Net income		11,856,000	41,455,000
Ending Balance		1,614,344,000	1,848,751,000
Retained Earnings | Accounting Standards Update 2016-01
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]			8,334,000
Retained Earnings | Accounting Standards Update 2018-02
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]			$ (3,416,000)
Retained Earnings | Accounting Standards Update 2016-09
Increase (Decrease) in Stockholders' Equity:
Cumulative-effect adjustment adoption of ASU	[1]				$ (276,000)
Treasury Stock
Increase (Decrease) in Stockholders' Equity:
Beginning Balance		(418,007,000)	(419,930,000)
Common shares issued for compensation and effect of shares reissued to stock purchase plan		(2,000)	2,000
Ending Balance		$ (418,009,000)	$ (419,928,000)

[1] See Note 1 for discussion of accounting guidance adopted during the period.

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Condensed Consolidated Statements of Income and Comprehensive Income (Unaudited) - USD ($) shares in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenues
Net premiums earned	$ 187,159,000	$ 182,903,000
Net investment income	22,027,000	23,186,000
Equity in earnings (loss) of unconsolidated subsidiaries	1,640,000	1,808,000
Net realized investment gains (losses):
OTTI losses	0	(419,000)
Portion of OTTI losses recognized in other comprehensive income before taxes	0	248,000
Net impairment losses recognized in earnings	0	(171,000)
Other net realized investment gains (losses)	(12,517,000)	13,451,000
Total net realized investment gains (losses)	(12,517,000)	13,280,000
Other income	2,723,000	1,821,000
Total revenues	201,032,000	222,998,000
Expenses
Net losses and loss adjustment expenses	129,786,000	119,151,000
Underwriting, policy acquisition and operating expenses
Operating expense	32,467,000	34,482,000
DPAC amortization	24,893,000	22,626,000
Segregated portfolio cells dividend expense (income)	1,747,000	2,375,000
Interest expense	3,705,000	4,133,000
Total expenses	192,598,000	182,767,000
Income before income taxes	8,434,000	40,231,000
Provision for income taxes
Current expense (benefit)	(1,328,000)	(8,278,000)
Deferred expense (benefit)	(2,094,000)	7,054,000
Total income tax expense (benefit)	(3,422,000)	(1,224,000)
Net income	11,856,000	41,455,000
Other comprehensive income (loss), after tax, net of reclassification adjustments	(26,373,000)	2,924,000
Comprehensive income (loss)	$ (14,517,000)	$ 44,379,000
Earnings per share
Basic (USD per share)	$ 0.22	$ 0.78
Diluted (USD per share)	$ 0.22	$ 0.77
Weighted average number of common shares outstanding:
Basic (in shares)	53,515	53,315
Diluted (in shares)	53,682	53,535
Cash dividends declared per common share (USD per share)	$ 0.310	$ 0.31

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Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Operating Activities
Net income	$ 11,856,000	$ 41,455,000
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization, net of accretion	6,079,000	7,803,000
(Increase) decrease in cash surrender value of BOLI	(449,000)	(455,000)
Net realized investment (gains) losses	12,517,000	(13,280,000)
Share-based compensation	902,000	3,346,000
Deferred income taxes	(2,094,000)	7,054,000
Policy acquisition costs, net of amortization (net deferral)	(504,000)	(2,376,000)
Equity in (earnings) loss of unconsolidated subsidiaries	(1,640,000)	(1,808,000)
Distributed earnings from unconsolidated subsidiaries	7,018,000	10,893,000
Other	752,000	(167,000)
Other changes in assets and liabilities:
Premiums receivable	(9,559,000)	(1,238,000)
Reinsurance related assets and liabilities	9,651,000	2,428,000
Other assets	6,254,000	(5,027,000)
Reserve for losses and loss adjustment expenses	8,420,000	3,561,000
Unearned premiums	27,743,000	24,576,000
Other liabilities	(3,592,000)	(7,393,000)
Net cash provided (used) by operating activities	73,354,000	69,372,000
Purchases of:
Fixed maturities, available for sale	(367,872,000)	(160,364,000)
Fixed maturities, trading	(4,162,000)	0
Equity investments	(67,129,000)	(35,400,000)
Other investments	(7,108,000)	(3,930,000)
Funding of qualified affordable housing project tax credit partnerships	0	(37,000)
Investment in unconsolidated subsidiaries	(21,985,000)	(5,613,000)
Proceeds from sales or maturities of:
Fixed maturities, available for sale	459,822,000	171,986,000
Equity investments	51,085,000	41,584,000
Other investments	6,092,000	6,788,000
Return of invested capital from unconsolidated subsidiaries	11,783,000	6,955,000
Net sales or maturities (purchases) of short-term investments	82,976,000	160,792,000
Unsettled security transactions, net change	22,421,000	6,296,000
Purchases of capital assets	(1,836,000)	(4,535,000)
Repayments (advances) under Syndicate Credit Agreement	(17,980,000)	1,159,000
Net cash provided (used) by investing activities	146,107,000	185,681,000
Financing Activities
Borrowings (repayments) under Revolving Credit Agreement	(40,000,000)	0
Repayments of Mortgage Loans	(349,000)	0
Dividends to shareholders	(266,734,000)	(265,664,000)
External capital contribution received for segregated portfolio cells	251,000	114,000
Other	(3,877,000)	(4,932,000)
Net cash provided (used) by financing activities	(310,709,000)	(270,482,000)
Increase (decrease) in cash and cash equivalents	(91,248,000)	(15,429,000)
Cash and cash equivalents at beginning of period	134,495,000	117,347,000
Cash and cash equivalents at end of period	43,247,000	101,918,000
Significant Non-Cash Transactions
Dividends declared and not yet paid	$ 16,616,000	$ 16,516,000

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Basis of Presentation

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of ProAssurance Corporation and its consolidated subsidiaries (ProAssurance, PRA or the Company). The financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation, consisting of normal recurring adjustments, have been included. ProAssurance’s results for the three months endedMarch 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes contained in ProAssurance’s December 31, 2017 report on Form 10-K. In connection with its preparation of the Condensed Consolidated Financial Statements, ProAssurance evaluated events that occurred subsequent to March 31, 2018 for recognition or disclosure in its financial statements and notes to financial statements.

ProAssurance operates in four reportable segments as follows: Specialty P&C, Workers' Compensation, Lloyd's Syndicate and Corporate. For more information on the nature of products and services provided and for financial information by segment, refer to Note 12.

Reclassifications

In the second quarter of 2017, ProAssurance began presenting separately the components of underwriting, policy acquisition and operating expense as operating expense and DPAC amortization on the Condensed Consolidated Statements of Income and Comprehensive Income in order to provide additional details for investors. The Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2017 have been reclassified to conform to the current period presentation. Total underwriting, policy acquisition and operating expense as well as net income for the three months endedMarch 31, 2017 was not affected by the change in presentation.

Certain other insignificant prior period amounts have been reclassified to conform to the current period presentation.

Other Liabilities

Other liabilities consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
SPC dividends payable	$	47,122	$	46,925
Unpaid dividends	16,616		267,292
All other	144,128		123,383
Total other liabilities	$	207,866	$	437,600

SPC dividends payable are the cumulative undistributed earnings contractually payable to the external preferred shareholders of the SPCs operated by Eastern Re and Inova Re, ProAssurance's Cayman Islands reinsurance subsidiaries.

Unpaid dividends represent common stock dividends declared by ProAssurance's Board that had not yet been paid as of March 31, 2018. Unpaid dividends at December 31, 2017 reflected a special dividend declared in the fourth quarter of 2017 that was paid in January 2018.

Accounting Changes Adopted

Restricted Cash (ASU 2016-18)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of restricted cash presented in the statement of cash flows with the objective of reducing diversity in practice. Under the new guidance, entities are required to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts as presented on the statement of cash flows. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Intra-Entity Transfers of Assets Other than Inventory (ASU 2016-16)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards related to the income tax consequences of intra-entity transfers of assets other than inventory between tax-paying components. A tax-paying component is an individual entity or group of entities that is consolidated for tax purposes. Under the new guidance, entities are required to recognize income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs instead of delaying recognition until the asset has been sold to an outside party. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Classification of Certain Cash Receipts and Cash Payments (ASU 2016-15)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of certain cash receipts and cash payments presented in the statement of cash flows with the objective of reducing diversity in practice. ProAssurance adopted the guidance as of January 1, 2018 and elected to use the cumulative earnings approach for presenting distributions from equity method investees. Adoption of the guidance had no material effect on ProAssurance’s results of operations or financial position; however, ProAssurance reclassified approximately $10.9 million in distributions from unconsolidated subsidiaries from investing activities to operating activities in the Condensed Consolidated Statement of Cash Flows for the three months endedMarch 31, 2017.

Revenue from Contracts with Customers (ASU 2014-09)

Effective for fiscal years beginning after December 15, 2017 the FASB issued guidance related to revenue from contracts with customers. The core principle of the new guidance is that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ProAssurance adopted the guidance as of January 1, 2018 under the modified retrospective method. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The new guidance also specifies that an entity use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and present financial assets and liabilities by measurement category and form of financial asset. Other provisions of the new guidance include: revised disclosure requirements related to the presentation in comprehensive income of changes in the fair value of liabilities; elimination, for public companies, of disclosure requirements relative to the methods and significant assumptions underlying fair values disclosed for financial instruments measured at amortized cost; and simplified impairment assessments for equity investments without readily determinable fair values. ProAssurance adopted the guidance as of January 1, 2018 using a modified retrospective application and recorded a cumulative-effect after-tax adjustment of approximately $8.3 million to beginning retained earnings in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Modification Accounting for Employee Share-Based Payment Awards (ASU 2017-09)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards when there is a change in the terms or conditions of a share-based payment award. The new guidance clarifies that an entity should apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Reclassification of Certain Tax Effects from AOCI (ASU 2018-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted, the FASB issued guidance which permits a reclassification from AOCI to retained earnings for stranded tax effects resulting from the newly enacted federal corporate tax rate from the TCJA. The amount of the reclassification from AOCI to retained earnings will be the difference between the historical corporate tax rate and the newly enacted 21% corporate tax rate on deferred tax items originally established through OCI and not net income. The guidance allows entities to adopt in any interim or annual period for which financial statements have not yet been issued and apply the guidance either (1) in the period of adoption or (2) retrospectively to each period in which the effect of the change in the tax rate is recognized. ProAssurance adopted this guidance as of January 1, 2018 and elected to apply this guidance in the period of adoption using the specific identification method. Using a modified retrospective application, ProAssurance recorded a cumulative-effect adjustment which increased beginning AOCI by approximately $3.4 million and decreased beginning retained earnings by the same amount in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of this guidance had no material effect on ProAssurance's financial position, results of operations or cash flows.

Accounting Changes Not Yet Adopted

Technical Corrections and Improvements to Financial Instruments - Overall (ASU 2018-03)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years beginning after June 15, 2018, the FASB amended the new standard on recognizing and measuring financial assets and financial liabilities to clarify certain aspects of the guidance. Under the amended guidance, an entity that uses the measurement alternative for equity investments without readily determinable fair values can change its measurement approach to a fair value method through an irrevocable election that would apply to that security and all identical or similar investments of the same issuer. Also, entities are required to use the prospective transition approach only for equity investments they elect to measure using the new measurement alternative. Additionally, the guidance clarifies how to apply the measurement alternative and presentation requirements for financial liabilities measured under the fair value option. ProAssurance plans to adopt the guidance beginning July 1, 2018. As of March 31, 2018, ProAssurance does not have any equity investments without readily determinable fair values or financial liabilities measured under the fair value option; therefore, adoption of the guidance is not expected to have a material effect on ProAssurance’s financial position, results of operations or cash flows.

Leases (ASU 2016-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that requires a lessee to recognize for all leases (with the exception of short-term leases) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. ProAssurance plans to adopt the guidance beginning January 1, 2019 and is currently in the process of evaluating all of its leases. As the majority of ProAssurance's leases are real estate operating leases and are not considered to be material, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Premium Amortization on Purchased Callable Debt Securities (ASU 2017-08)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that will require the premium for certain callable debt securities to be amortized over a shorter period than is currently required. Currently amortization is permitted over the contractual life of the instrument and the guidance shortens the amortization to the earliest call date. The purpose of the guidance is to more closely align the amortization period of premiums to expectations incorporated in market pricing on the underlying securities. ProAssurance plans to adopt the guidance beginning January 1, 2019. As ProAssurance amortizes premium on callable debt securities to the earliest call date, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Derivatives and Hedging (ASU 2017-12)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance to improve financial reporting of hedging relationships to better portray the entity's risk management activities in the consolidated financial statements. The new guidance eliminates the requirement to separately measure and report hedge ineffectiveness and requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. ProAssurance plans to adopt the guidance beginning January 1, 2019. ProAssurance's derivative instrument at March 31, 2018 is not designated as a hedging instrument; therefore, adoption is not expected to have a material effect on ProAssurance's results of operations, financial position or cash flows.

Improvements to Financial Instruments - Credit Losses (ASU 2016-13)

Effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that replaces the incurred loss impairment methodology, which delays recognition of credit losses until a probable loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. Under the new guidance, credit losses are required to be recorded through an allowance for credit losses account and the income statement reflects the measurement for newly recognized financial assets, as well as increases or decreases of expected credit losses that have taken place during the period. ProAssurance is in the process of evaluating the effect the new guidance would have on its results of operations and financial position and plans to adopt the guidance beginning January 1, 2020.

Simplifying the Test for Goodwill Impairment (ASU 2017-04)

Effective for the fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that simplifies the requirements to test goodwill for impairment for business entities that have goodwill reported in their financial statements. The guidance eliminates the second step of the impairment test which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount. In addition, the guidance also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. ProAssurance plans to adopt the guidance beginning January 1, 2020. Adoption is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

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Fair Value Measurement

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Fair Value Measurement

Fair Value Measurement

Fair value is defined as the price that would be received to sell an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. A three level hierarchy has been established for valuing assets and liabilities based on how transparent (observable) the inputs are that are used to determine fair value, with the inputs considered most observable categorized as Level 1 and those that are the least observable categorized as Level 3. Hierarchy levels are defined as follows:

Level 1: quoted (unadjusted) market prices in active markets for identical assets and liabilities. For ProAssurance, Level 1 inputs are generally quotes for debt or equity securities actively traded in exchange or over-the-counter markets.

Level 2: market data obtained from sources independent of the reporting entity (observable inputs). For ProAssurance, Level 2 inputs generally include quoted prices in markets that are not active, quoted prices for similar assets or liabilities, and results from pricing models that use observable inputs such as interest rates and yield curves that are generally available at commonly quoted intervals.

Level 3: the reporting entity's own assumptions about market participant assumptions based on the best information available in the circumstances (non-observable inputs). For ProAssurance, Level 3 inputs are used in situations where little or no Level 1 or 2 inputs are available or are inappropriate given the particular circumstances. Level 3 inputs include results from pricing models for which some or all of the inputs are not observable, discounted cash flow methodologies, single non-binding broker quotes and adjustments to externally quoted prices that are based on management judgment or estimation.

Fair values of assets measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are shown in the following tables. Where applicable, the tables also indicate the fair value hierarchy of the valuation techniques utilized to determine those fair values. For some assets, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. When this is the case, the asset is categorized based on the level of the most significant input to the fair value measurement. Assessments of the significance of a particular input to the fair value measurement require judgment and consideration of factors specific to the assets being valued.

	March 31, 2018
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	129,751	$	—	$	129,751
U.S. Government-sponsored enterprise obligations	—		29,959		—		29,959
State and municipal bonds	—		329,995		—		329,995
Corporate debt, multiple observable inputs	2,334		1,230,832		—		1,233,166
Corporate debt, limited observable inputs	—		—		15,097		15,097
Residential mortgage-backed securities	—		215,420		—		215,420
Agency commercial mortgage-backed securities	—		14,887		—		14,887
Other commercial mortgage-backed securities	—		29,195		—		29,195
Other asset-backed securities	—		138,890		17,323		156,213
Fixed maturities, trading
Corporate debt	—		4,148		—		4,148
Equity investments
Financial	74,556		—		—		74,556
Utilities/Energy	46,637		—		—		46,637
Consumer oriented	54,789		—		—		54,789
Industrial	48,859		—		—		48,859
Bond funds	153,256		—		—		153,256
All other	93,847		—		—		93,847
Short-term investments	288,019		61,100		—		349,119
Other investments	604		32,073		365		33,042
Other assets	—		2,306		—		2,306
Total assets categorized within the fair value hierarchy	$	762,901	$	2,218,556	$	32,785	3,014,242
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Equity investments							20,215
Investment in unconsolidated subsidiaries							277,094
Total assets at fair value							$	3,311,551

	December 31, 2017
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	133,627	$	—	$	133,627
U.S. Government-sponsored enterprise obligations	—		20,956		—		20,956
State and municipal bonds	—		632,243		—		632,243
Corporate debt, multiple observable inputs	2,371		1,151,084		—		1,153,455
Corporate debt, limited observable inputs	—		—		13,703		13,703
Residential mortgage-backed securities	—		196,789		1,055		197,844
Agency commercial mortgage-backed securities	—		10,742		—		10,742
Other commercial mortgage-backed securities	—		15,961		—		15,961
Other asset-backed securities	—		97,780		3,931		101,711
Equity investments
Financial	76,051		—		—		76,051
Utilities/Energy	54,388		—		—		54,388
Consumer oriented	54,529		—		—		54,529
Industrial	53,936		—		—		53,936
Bond funds	156,563		—		—		156,563
All other	75,142		—		—		75,142
Short-term investments	404,204		27,922		—		432,126
Other investments	607		31,155		409		32,171
Other assets	—		1,731		—		1,731
Total assets categorized within the fair value hierarchy	$	877,791	$	2,319,990	$	19,098	3,216,879
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Investment in unconsolidated subsidiaries							210,759
Other investments							20,130
Total assets at fair value							$	3,447,768

The fair values for securities included in the Level 2 category, with the few exceptions described below, were developed by one of several third party, nationally recognized pricing services, including services that price only certain types of securities. Each service uses complex methodologies to determine values for securities and subject the values they develop to quality control reviews. Management selected a primary source for each type of security in the portfolio and reviewed the values provided for reasonableness by comparing data to alternate pricing services and to available market and trade data. Values that appeared inconsistent were further reviewed for appropriateness. Any value that did not appear reasonable was discussed with the service that provided the value and adjusted, if necessary. There were no material changes to the values supplied by the pricing services during the three months endedMarch 31, 2018 and 2017.

Level 2 Valuations

Below is a summary description of the valuation methodologies primarily used by the pricing services for securities in the Level 2 category, by security type:

U.S. Treasury obligations were valued based on quoted prices for identical assets, or, in markets that are not active, quotes for similar assets, taking into consideration adjustments for variations in contractual cash flows and yields to maturity.

U.S. Government-sponsored enterprise obligations were valued using pricing models that consider current and historical market data, normal trading conventions, credit ratings, and the particular structure and characteristics of the security being valued, such as yield to maturity, redemption options, and contractual cash flows. Adjustments to model inputs or model results were included in the valuation process when necessary to reflect recent regulatory, government or corporate actions or significant economic, industry or geographic events affecting the security’s fair value.

State and municipal bonds were valued using a series of matrices that considered credit ratings, the structure of the security, the sector in which the security falls, yields, and contractual cash flows. Valuations were further adjusted, when necessary, to reflect the expected effect on fair value of recent significant economic or geographic events or ratings changes.

Corporate debt, multiple observable inputs consisted primarily of corporate bonds, but also included a small number of bank loans. The methodology used to value Level 2 corporate bonds was the same as the methodology previously described for U.S. Government-sponsored enterprise obligations. Bank loans were valued based on an average of broker quotes for the loans in question, if available. If quotes were not available, the loans were valued based on quoted prices for comparable loans or, if the loan was newly issued, by comparison to similar seasoned issues. Broker quotes were compared to actual trade prices to permit assessment of the reliability of the quotes; unreliable quotes were not considered in quoted averages.

Residential and commercial mortgage-backed securities were valued using a pricing matrix which considers the issuer type, coupon rate and longest cash flows outstanding. The matrix used was based on the most recently available market information. Agency and non-agency collateralized mortgage obligations were both valued using models that consider the structure of the security, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data.

Other asset-backed securities were valued using models that consider the structure of the security, monthly payment information, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data. Spreads and prepayment speeds consider collateral type.

Short-term investments were securities maturing within one year, carried at cost which approximated the fair value of the security due to the short term to maturity.

Other investments consisted primarily of convertible bonds valued using a pricing model that incorporated selected dealer quotes as well as current market data regarding equity prices and risk free rates. If dealer quotes were unavailable for the security being valued, quotes for securities with similar terms and credit status were used in the pricing model. Dealer quotes selected for use were those considered most accurate based on parameters such as underwriter status and historical reliability.

Other assets consisted of an interest rate cap derivative instrument valued using a model which considers the volatilities from other instruments with similar maturities, strike prices, durations and forward yield curves.

Level 3 Valuations

Below is a summary description of the valuation processes and methodologies used as well as quantitative information regarding securities in the Level 3 category.

Level 3 Valuation Processes

• Level 3 securities are priced by the Chief Investment Officer.

• Level 3 valuations are computed quarterly. Prices are evaluated quarterly against prior period prices and the expected change in prices.

• ProAssurance's Level 3 securities are primarily NRSRO rated debt instruments for which comparable market inputs are commonly available for evaluating the securities in question. Valuation of these debt instruments is not overly sensitive to changes in the unobservable inputs used.

Level 3 Valuation Methodologies

Corporate debt, limited observable inputs consisted of corporate bonds valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 87% of the securities were rated and the average rating was BBB. At December 31, 2017, 84% of the securities were rated and the average rating was BBB+.

Residential mortgage-backed and other asset-backed securities consisted of securitizations of receivables valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 78% of the securities were rated and the average rating was AAA. At December 31, 2017, 21% of the securities were rated and the average rating was AAA.

Other investments consisted of convertible securities for which limited observable inputs were available at March 31, 2018 and December 31, 2017. The securities were valued internally based on expected cash flows, including the expected final recovery, discounted at a yield that considered the lack of liquidity and the financial status of the issuer.

Quantitative Information Regarding Level 3 Valuations

	Fair Value at
(In thousands)	March 31, 2018	December 31, 2017	Valuation Technique	Unobservable Input	Range (Weighted Average)
Assets:
Corporate debt, limited observable inputs	$15,097	$13,703	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Residential mortgage-backed and other asset-backed securities	$17,323	$4,986	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Other investments	$365	$409	Discounted Cash Flows	Comparability Adjustment	0% - 10% (5%)

The significant unobservable inputs used in the fair value measurement of the above listed securities were the valuations of comparable securities with similar issuers, credit quality and maturity. Changes in the availability of comparable securities could result in changes in the fair value measurements.

Fair Value Measurements - Level 3 Assets

The following tables (the Level 3 Tables) present summary information regarding changes in the fair value of assets measured at fair value using Level 3 inputs.

	March 31, 2018
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments			Total
Balance December 31, 2017	$	13,703		$	4,986		$	409		$	19,098
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(38		)	—			—			(38		)
Net realized investment gains (losses)	—			—			(44		)	(44		)
Included in other comprehensive income	(38		)	(30		)	—			(68		)
Purchases	6,005			13,453			—			19,458
Sales	(2,905		)	(27		)	—			(2,932		)
Transfers in	2,069			—			—			2,069
Transfers out	(3,699		)	(1,059		)	—			(4,758		)
Balance March 31, 2018	$	15,097		$	17,323		$	365		$	32,785
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—		$	—

	March 31, 2017
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments		Total
Balance December 31, 2016	$	14,810		$	3,007		$	3	$	17,820
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(39		)	—			—		(39		)
Net realized investment gains (losses)	13			—			—		13
Included in other comprehensive income	(208		)	(5		)	2		(211		)
Purchases	7,048			—			—		7,048
Sales	(1,712		)	—			—		(1,712		)
Transfers in	—			—			898		898
Transfers out	(998		)	—			—		(998		)
Balance March 31, 2017	$	18,914		$	3,002		$	903	$	22,819
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—	$	—

Transfers

There were no transfers between the Level 1 and Level 2 categories during the three months endedMarch 31, 2018. During the three months endedMarch 31, 2017, equity securities of approximately $35.4 million were transferred from Level 2 to Level 1.

Transfers shown in the preceding Level 3 tables were as of the end of the quarter in which the transfer occurred. All transfers were to or from Level 2.

All transfers during the three months endedMarch 31, 2018 and 2017 related to securities held for which the level of market activity for identical or nearly identical securities varies from period to period. The securities were valued using multiple observable inputs when those inputs were available; otherwise the securities were valued using limited observable inputs.

Fair Values Not Categorized

At March 31, 2018 and December 31, 2017, certain LPs/LLCs and investment funds measure fund assets at fair value on a recurring basis and provide a NAV for ProAssurance's interest. The carrying value of these interests is based on the NAV provided and was considered to approximate the fair value of the interests. For investment in unconsolidated subsidiaries, ProAssurance recognizes any changes in the NAV of its interests in equity in earnings (loss) of unconsolidated subsidiaries during the period of change. In accordance with GAAP, the fair value of these investments was not classified within the fair value hierarchy. The amount of ProAssurance's unfunded commitments related to these investments as of March 31, 2018 and fair values of these investments as of March 31, 2018 and December 31, 2017 was as follows:

	Unfunded Commitments	Fair Value
(In thousands)	March 31, 2018	March 31, 2018		December 31, 2017
Equity investments:
Mortgage fund (1)*	None	$	20,215	$	—
Investment in unconsolidated subsidiaries:
Private debt funds (2)	$4,976	32,064		42,206
Long equity fund (3)	None	7,957		7,847
Long/short equity funds (4)	None	32,177		31,352
Non-public equity funds (5)	$82,135	105,049		100,062
Multi-strategy fund of funds (6)	None	9,274		9,100
Credit funds (7)	None	17,789		6,561
Long/short commodities fund (8)	None	13,063		13,025
Strategy focused funds (9)	$19,241	59,721		606
		277,094		210,759
Other investments:
Mortgage fund (1)*	See above	—		20,130
Total investments carried at NAV		$	297,309	$	230,889
* In the first quarter of 2018, ProAssurance began presenting this investment previously reported as a part of other investments as a part of equity investments on the Condensed Consolidated Balance Sheet as of March 31, 2018. Prior year amounts have not been reclassified.

Below is additional information regarding each of the investments listed in the table above as of March 31, 2018.

⁽¹⁾  This investment fund is focused on the structured mortgage market. The fund will primarily invest in U.S. Agency mortgage-backed securities. Redemptions are allowed at the end of any calendar quarter with a prior notice requirement of 65 days and are paid within 45 days at the end of the redemption dealing day.

⁽²⁾  The investment is comprised of interests in two unrelated LP funds that are structured to provide interest distributions primarily through diversified portfolios of private debt instruments. One LP allows redemption by special consent; the other does not permit redemption. Income and capital are to be periodically distributed at the discretion of the LPs over an anticipated time frame that spans from three to eight years.

⁽³⁾  The fund is a LP that holds long equities of public international companies. Redemptions are allowed at the end of any calendar month with a prior notice requirement of 15 days and are paid within 10 days of the end of the calendar month of the redemption request.

⁽⁴⁾  The investment is comprised of interests in multiple unrelated LP funds. The funds hold primarily long and short North American equities and target absolute returns using strategies designed to take advantage of market opportunities. The funds generally permit quarterly or semi-annual capital redemptions subject to notice requirements of 30 to 90 days. For some funds, redemptions above specified thresholds (lowest threshold is 90%) may be only partially payable until after a fund audit is completed and are then payable within 30 days.

⁽⁵⁾  The investment is comprised of interests in multiple unrelated LP funds, each structured to provide capital appreciation through diversified investments in private equity, which can include investments in buyout, venture capital, debt including senior, second lien and mezzanine, distressed debt and other private equity-oriented LPs. Two of the LPs allow redemption by terms set forth in the LP agreements; the others do not permit redemption. Income and capital are to be periodically distributed at the discretion of the LP over time frames that are anticipated to span up to nine years.

⁽⁶⁾  This fund is a LLC structured to build and manage low volatility, multi-manager portfolios that have little or no correlation to the broader fixed income and equity security markets. Redemptions are not permitted but offers to repurchase units of the LLC may be extended periodically.

⁽⁷⁾  The investment is comprised of two unrelated LP funds. One fund seeks to obtain superior risk-adjusted absolute returns through a diversified portfolio of debt securities, including bonds, loans and other asset-backed instruments. The second fund seeks event driven opportunities across the corporate credit spectrum. For both funds, redemptions are allowed at any quarter-end with a prior notice requirement of 90 days.

⁽⁸⁾  This fund is a LLC invested across a broad range of commodities and focuses primarily on market neutral, relative value strategies, seeking to generate absolute returns with low correlation to broad commodity, equity and fixed income markets. Following an initial one-year lock-up period, redemptions are allowed with a prior notice requirement of 30 days and are payable within 30 days.

⁽⁹⁾ The investment is comprised of multiple unrelated LP funds. One fund is a LLC focused on investing in North American consumer products companies, comprised of equity and equity-related securities, as well as debt instruments. Redemptions are not permitted. Another fund is a LP focused on North American energy infrastructure assets that allows redemption with consent of the General Partner. The remaining funds are real estate focused LPs, one of which allows for redemption with prior notice.

ProAssurance may not sell, transfer or assign its interest in any of the above LPs/LLCs without special consent from the LPs/LLCs.

Nonrecurring Fair Value Measurement

At March 31, 2018, ProAssurance did not have any assets or liabilities that were measured at fair value on a nonrecurring basis. At December 31, 2017, ProAssurance held an equity method early stage business investment measured at fair value on a nonrecurring basis due to a recognized OTTI of $8.5 million. The investment was valued using significant unobservable inputs (Level 3) and had a fair value of $1.2 million at December 31, 2017. The fair value of the investment was measured as ProAssurance's ownership percentage in the projected earnings and cash flows expected to be generated by the investment.

Financial Instruments - Methodologies Other Than Fair Value

The following table provides the estimated fair value of our financial instruments that, in accordance with GAAP for the type of investment, are measured using a methodology other than fair value. All fair values provided primarily fall within the Level 3 fair value category.

	March 31, 2018				December 31, 2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Financial assets:
BOLI	$	62,562	$	62,562	$	62,113	$	62,113
Other investments	$	2,902	$	2,902	$	58,546	$	69,095
Other assets	$	49,549	$	48,816	$	34,020	$	33,742
Financial liabilities:
Senior notes due 2023*	$	250,000	$	269,418	$	250,000	$	273,153
Revolving Credit Agreement*	$	83,000	$	83,000	$	123,000	$	123,000
Mortgage loans*	$	40,111	$	40,111	$	40,460	$	40,460
Other liabilities	$	21,525	$	21,525	$	21,154	$	21,154
* Carrying value excludes debt issuance costs.

The fair value of the BOLI was equal to the cash surrender value associated with the policies on the valuation date.

Other investments listed in the table above include FHLB common stock carried at cost and an annuity investment carried at amortized cost. Two of ProAssurance's insurance subsidiaries are members of an FHLB. The estimated fair value of the FHLB common stock was based on the amount the subsidiaries would receive if their memberships were canceled, as the memberships cannot be sold. The fair value of the annuity represents the present value of the expected future cash flows discounted using a rate available in active markets for similarly structured instruments.

Other assets and other liabilities primarily consisted of related investment assets and liabilities associated with funded deferred compensation agreements. The fair value of the funded deferred compensation assets was based upon quoted market prices, which is categorized as a Level 1 valuation, and had a fair value of $21.6 million and $20.2 million at March 31, 2018 and December 31, 2017, respectively. The deferred compensation liabilities are adjusted to match the fair value of the deferred compensation assets. Other assets also included a secured note receivable and unsecured note receivable under two separate line of credit agreements. Fair value of these notes receivable was based on the present value of expected cash flows from the notes receivable, discounted at market rates on the valuation date for receivables with similar credit standings and similar payment structures.

The fair value of the debt was estimated based on the present value of expected future cash outflows, discounted at rates available on the valuation date for similar debt issued by entities with a similar credit standing to ProAssurance.

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Investments

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Investments

Investments

Available-for-sale fixed maturities at March 31, 2018 and December 31, 2017 included the following:

	March 31, 2018
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	305	$	2,209	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		27		445		29,959
State and municipal bonds	324,336		6,613		954		329,995
Corporate debt	1,259,132		7,008		17,877		1,248,263
Residential mortgage-backed securities	217,891		1,502		3,973		215,420
Agency commercial mortgage-backed securities	15,078		29		220		14,887
Other commercial mortgage-backed securities	29,409		100		314		29,195
Other asset-backed securities	157,506		40		1,333		156,213
	$	2,165,384	$	15,624	$	27,325	$	2,153,683
	December 31, 2017
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	134,323	$	485	$	1,181	$	133,627
U.S. Government-sponsored enterprise obligations	21,089		73		206		20,956
State and municipal bonds	618,414		14,248		419		632,243
Corporate debt	1,157,660		15,205		5,707		1,167,158
Residential mortgage-backed securities	196,741		2,438		1,335		197,844
Agency commercial mortgage-backed securities	10,827		23		108		10,742
Other commercial mortgage-backed securities	16,004		91		134		15,961
Other asset-backed securities	102,130		47		466		101,711
	$	2,257,188	$	32,610	$	9,556	$	2,280,242

The recorded cost basis and estimated fair value of available-for-sale fixed maturities at March 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(In thousands)	Amortized Cost		Due in one year or less		Due after one year through five years		Due after five years through ten years		Due after ten years		Total Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	31,700	$	73,858	$	21,321	$	2,872	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		—		8,009		21,814		136		29,959
State and municipal bonds	324,336		29,481		111,512		140,004		48,998		329,995
Corporate debt	1,259,132		115,385		682,646		404,159		46,073		1,248,263
Residential mortgage-backed securities	217,891										215,420
Agency commercial mortgage-backed securities	15,078										14,887
Other commercial mortgage-backed securities	29,409										29,195
Other asset-backed securities	157,506										156,213
	$	2,165,384									$	2,153,683

Excluding obligations of the U.S. Government, U.S. Government-sponsored enterprises and a U.S. Government obligations money market fund, no investment in any entity or its affiliates exceeded 10% of shareholders’ equity at March 31, 2018.

Cash and securities with a carrying value of $45.8 million at March 31, 2018 were on deposit with various state insurance departments to meet regulatory requirements. ProAssurance also held securities with a carrying value of $120.1 million at March 31, 2018 that are pledged as collateral security for advances under the Revolving Credit Agreement (see Note 7 for additional detail on the Revolving Credit Agreement).

As a member of Lloyd's and a capital provider to Syndicate 1729 and Syndicate 6131, which began active operations on January 1, 2018, ProAssurance is required to maintain capital at Lloyd's, referred to as FAL. ProAssurance's FAL investments at March 31, 2018 included fixed maturities with a fair value of $123.5 million and short-term investments with a fair value of approximately $0.4 million on deposit with Lloyd's in order to satisfy these FAL requirements.

Investments Held in a Loss Position

The following tables provide summarized information with respect to investments held in an unrealized loss position at March 31, 2018 and December 31, 2017, including the length of time the investment had been held in a continuous unrealized loss position.

	March 31, 2018
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	121,718	$	2,209	$	87,740	$	1,438	$	33,978	$	771
U.S. Government-sponsored enterprise obligations	29,018		445		22,252		218		6,766		227
State and municipal bonds	63,690		954		55,761		620		7,929		334
Corporate debt	848,499		17,877		733,344		13,216		115,155		4,661
Residential mortgage-backed securities	175,295		3,973		132,075		2,066		43,220		1,907
Agency commercial mortgage-backed securities	9,547		220		7,638		101		1,909		119
Other commercial mortgage-backed securities	19,145		314		15,723		256		3,422		58
Other asset-backed securities	118,780		1,333		105,370		1,134		13,410		199
	$	1,385,692	$	27,325	$	1,159,903	$	19,049	$	225,789	$	8,276

	December 31, 2017
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	110,788	$	1,181	$	67,135	$	554	$	43,653	$	627
U.S. Government-sponsored enterprise obligations	17,032		206		10,182		64		6,850		142
State and municipal bonds	23,122		419		15,168		102		7,954		317
Corporate debt	487,578		5,707		365,541		2,730		122,037		2,977
Residential mortgage-backed securities	109,659		1,335		64,121		402		45,538		933
Agency commercial mortgage-backed securities	4,423		108		2,458		34		1,965		74
Other commercial mortgage-backed securities	12,878		134		7,939		82		4,939		52
Other asset-backed securities	85,358		466		70,924		346		14,434		120
	$	850,838	$	9,556	$	603,468	$	4,314	$	247,370	$	5,242

As of March 31, 2018, excluding U.S. Government or U.S. Government-sponsored enterprise obligations, there were 943 debt securities (44.9% of all available-for-sale fixed maturity securities held) in an unrealized loss position representing 494 issuers. The greatest and second greatest unrealized loss positions among those securities were approximately $0.5 million and $0.4 million, respectively. The securities were evaluated for OTTI as of March 31, 2018.

As of December 31, 2017, excluding U.S. Government or U.S. Government-sponsored enterprise obligations, there were 629 debt securities (26.5% of all available-for-sale fixed maturity securities held) in an unrealized loss position representing 375 issuers. The greatest and second greatest unrealized loss positions among those securities were approximately $0.4 million and $0.3 million, respectively. The securities were evaluated for OTTI as of December 31, 2017.

Each quarter, ProAssurance performs a detailed analysis for the purpose of assessing whether any of the securities it holds in an unrealized loss position has suffered an OTTI. A detailed discussion of the factors considered in the assessment is included in Note 1 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

Fixed maturity securities held in an unrealized loss position at March 31, 2018, excluding asset-backed securities, have paid all scheduled contractual payments and are expected to continue doing so. Expected future cash flows of asset-backed securities, excluding those issued by GNMA, FNMA and FHLMC, held in an unrealized loss position were estimated as part of the March 31, 2018OTTI evaluation using the most recently available six-month historical performance data for the collateral (loans) underlying the security or, if historical data was not available, sector based assumptions, and equaled or exceeded the current amortized cost basis of the security.

Other information regarding sales and purchases of fixed maturity available-for-sale securities is as follows:

	Three Months Ended March 31
(In millions)	2018		2017
Proceeds from sales (exclusive of maturities and paydowns)	$	379.2	$	79.2
Purchases	$	367.9	$	160.4

Equity Investments

ProAssurance's equity investments are carried at fair value with changes in fair value recognized in income as a component of net realized investment gains (losses) during the period of change. Equity investments on the Condensed Consolidated Balance Sheet as of March 31, 2018 primarily included stocks, bonds and investment funds.

Short-term Investments

ProAssurance's short-term investments, which have a maturity at purchase of one year or less, are primarily comprised of investments in U.S. treasury obligations, commercial paper and money market funds. Short-term investments are carried at cost, which approximates fair value.

BOLI

ProAssurance holds BOLI policies that are carried at the current cash surrender value of the policies (original cost $33 million). All insured individuals were members of ProAssurance management at the time the policies were acquired. The primary purpose of the program is to offset future employee benefit expenses through earnings on the cash value of the policies. ProAssurance is the owner and beneficiary of these policies.

Net Investment Income

Net investment income by investment category was as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Fixed maturities	$	17,080		$	20,121
Equities	4,867			3,644
Short-term investments, including Other	1,308			801
BOLI	449			455
Investment fees and expenses	(1,677		)	(1,835		)
Net investment income	$	22,027		$	23,186

Investment in Unconsolidated Subsidiaries

ProAssurance's investment in unconsolidated subsidiaries were as follows:

	March 31, 2018	Carrying Value
(In thousands)	Percentage Ownership	March 31, 2018		December 31, 2017
Qualified affordable housing project tax credit partnerships	See below	$	80,507	$	84,607
Other tax credit partnerships	See below	5,735		6,118
All other investments, primarily investment fund LPs/LLCs	See below	314,788		239,866
		$	401,030	$	330,591

Qualified affordable housing project tax credit partnership interests held by ProAssurance generate investment returns by providing tax benefits to fund investors in the form of tax credits and project operating losses. The carrying value of these investments reflects ProAssurance's total commitments (both funded and unfunded) to the partnerships, less any amortization. ProAssurance's ownership percentage relative to two of the tax credit partnership interests is almost 100%; these interests had a carrying value of $30.7 million at March 31, 2018 and $32.5 million at December 31, 2017. ProAssurance's ownership percentage relative to the remaining tax credit partnership interests is less than 20%; these interests had a carrying value of $49.8 million at March 31, 2018 and $52.1 million at December 31, 2017. Since ProAssurance has the ability to exert influence over the partnerships but does not control them, all are accounted for using the equity method. See further discussion of the entities in which ProAssurance holds passive interests in Note 10.

Other tax credit partnerships are comprised entirely of historic tax credits. The historic tax credits generate investment returns by providing benefits to fund investors in the form of tax credits, tax deductible project operating losses and positive cash flows. The carrying value of these investments reflects ProAssurance's total funded commitments less any amortization. ProAssurance's ownership percentage relative to the tax credit partnerships is almost 100%. Since ProAssurance has the ability to exert influence over the partnerships but does not control them, all are accounted for using the equity method. See further discussion of the entities in which ProAssurance holds passive interests in Note 10.

ProAssurance holds interests in investment fund LPs/LLCs and other equity method investments and LPs/LLCs which are not considered to be investment funds. ProAssurance's ownership percentage relative to three of the LPs/LLCs is greater than 25%, which is expected to be reduced as the funds mature and other investors participate in the funds; these investments had a carrying value of $31.3 million at March 31, 2018 and $30.8 million at December 31, 2017. ProAssurance's ownership percentage relative to the remaining investments and LPs/LLCs is less than 25%; these interests had a carrying value of $283.5 million at March 31, 2018 and $209.1 million at December 31, 2017. ProAssurance does not have the ability to exert control over any of these funds.

Equity in Earnings (Loss) of Unconsolidated Subsidiaries

Equity in earnings (loss) of unconsolidated subsidiaries included losses from qualified affordable housing project tax credit investments and historic tax credit investments. The losses recorded reflect ProAssurance's allocable portion of partnership operating losses. Losses from qualified affordable housing project tax credit investments were $4.1 million and $3.3 million for the 2018 and 2017three-month periods, respectively, and tax credits recognized related to these investments totaled $4.6 million for both the 2018 and 2017three-month periods. Losses from historic tax credit investments were $1.9 million and $0.4 million and tax credits recognized related to these investments totaled $0.7 million and $1.8 million for the 2018 and 2017three-month periods, respectively. Tax credits recognized reduced income tax expense in the respective periods.

Net Realized Investment Gains (Losses)

Realized investment gains and losses are recognized on the first-in, first-out basis. The following table provides detailed information regarding net realized investment gains (losses):

	Three Months Ended March 31
(In thousands)	2018			2017
Total OTTI losses:
Corporate debt	$	—		$	(419	)
Portion of OTTI losses recognized in other comprehensive income before taxes:
Corporate debt	—			248
Net impairment losses recognized in earnings	—			(171		)
Gross realized gains, available-for-sale fixed maturities	4,464			1,853
Gross realized (losses), available-for-sale fixed maturities	(2,047		)	(67		)
Net realized gains (losses), equity investments	9,219			6,562
Net realized gains (losses), other investments	688			1,172
Change in unrealized holding gains (losses), trading fixed maturities	(49		)	—
Change in unrealized holding gains (losses), equity investments	(23,845		)	3,616
Change in unrealized holding gains (losses), convertible securities, carried at fair value	(954		)	313
Other	7			2
Net realized investment gains (losses)	$	(12,517	)	$	13,280

ProAssurance did not recognize any OTTI during the first quarter of 2018. During the first quarter of 2017, ProAssurance recognized OTTI in earnings of $0.2 million and $0.2 million of non-credit OTTI in OCI, both of which related to corporate bonds.

The following table presents a roll forward of cumulative credit losses recorded in earnings related to impaired debt securities for which a portion of the OTTI was recorded in OCI.

	Three Months Ended March 31
(In thousands)	2018		2017
Balance beginning of period	$	1,313	$	1,158
Additional credit losses recognized during the period, related to securities for which:
No OTTI has been previously recognized	—		171
Balance March 31	$	1,313	$	1,329

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Income Taxes

3 Months Ended

Mar. 31, 2018

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

ProAssurance estimates its annual effective tax rate at the end of each quarterly reporting period and uses this estimated rate to record the provision for income taxes in the interim financial statements. The provision for income taxes is different from that which would be obtained by applying the statutory federal income tax rate to income before income taxes primarily because a portion of ProAssurance’s investment income is tax-exempt, and because ProAssurance utilizes tax credit benefits transferred from tax credit partnership investments. In addition, ProAssurance's provision for income taxes in 2018 was impacted by certain provisions of the TCJA, as discussed below.

ProAssurance had a total liability for federal and U.K. income taxes of $6.3 million at March 31, 2018 and $8.0 million at December 31, 2017, both carried as a part of other liabilities. The liability for unrecognized tax benefits, which is included in the total liability for federal and U.K. income taxes, was $5.2 million and $5.8 million at March 31, 2018 and December 31, 2017, respectively, which included an accrued liability for interest of approximately $0.6 million and $0.5 million, respectively.

Tax Cuts and Jobs Act

The TCJA was signed into law on December 22, 2017 and contains several key provisions that impact the Company's business, including the reduction of the U.S. federal corporate tax rate from 35% to 21% effective January 1, 2018, the reduction in the amount of executive compensation that could qualify as a tax deduction, a minimum tax on payments made to related foreign entities and a change in how property and casualty taxpayers discount loss reserves.

Effective January 1, 2018, the TCJA introduced a minimum tax on payments made to related foreign entities referred to as the BEAT. The BEAT is imposed by adding back into the U.S. tax base any base erosion payment made by the U.S. taxpayer to a related foreign entity and applying a minimum tax rate to this newly calculated modified taxable income. Base erosion payments represent any amount paid or accrued by the U.S. taxpayer to a related foreign entity for which a deduction is allowed. Premiums the Company cedes to the SPCs at its newly formed wholly owned Cayman Islands reinsurance subsidiary, Inova Re, do not fall within the scope of base erosion payments as the SPCs at Inova Re intend to elect to be taxed as U.S. taxpayers. However, premiums the Company cedes to the one active SPC at its wholly owned Cayman Islands reinsurance subsidiary, Eastern Re, fall within the scope of base erosion payments and therefore could be significantly impacted by the BEAT. See further discussion on the Company’s new subsidiary, Inova Re, and its Cayman Islands SPC operations in Note 12. Management has evaluated its exposure to the BEAT and has concluded that the Company’s outbound deductible payments to related foreign entities are below the threshold for application of the BEAT; therefore, ProAssurance has not recognized any incremental tax expense for the BEAT provision of the TCJA for the three months endedMarch 31, 2018.

ProAssurance was able to complete its accounting for all areas of the TCJA during the period of enactment except as described below.

Provisional amount

As noted in ProAssurance's December 31, 2017 Form 10-K, ProAssurance was able to make a reasonable estimate of the effects on its existing deferred tax asset balances at December 31, 2017 as it relates to the limitation on the future deductibility of certain executive compensation and recorded a provisional charge to income tax expense from continuing operations for the year ended December 31, 2017. As of March 31, 2018, ProAssurance has not made any measurement-period adjustments to this provisional amount and any future guidance from the IRS addressing the effects of the TCJA on executive compensation could result in a material change to this provisional amount.

Provisional amount not reasonably estimable

As noted in ProAssurance's December 31, 2017 Form 10-K, ProAssurance was unable to reasonably estimate the impact of the change in loss reserve discounting factors due to the TCJA; therefore, no provisional amount was recorded at December 31, 2017. As of March 31, 2018, the IRS has yet to release the 2018 discount factors; therefore, ProAssurance has not adjusted its deferred tax balances due to the enactment of the TCJA. ProAssurance continues to utilize the discount factors based on existing accounting guidance and the provisions of the tax laws that were in effect immediately prior to enactment of the TCJA. Once the IRS releases the 2018 loss reserve discount factors, ProAssurance will complete its analysis and include the effect of the difference in the reserve discount factors in the period the analysis is complete or the impact is reasonably estimable.

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Reserve for Losses and Loss Adjustment Expenses

3 Months Ended

Mar. 31, 2018

Insurance [Abstract]

Reserve for Losses and Loss Adjustment Expenses

Reserve for Losses and Loss Adjustment Expenses

The reserve for losses is established based on estimates of individual claims and actuarially determined estimates of future losses based on ProAssurance’s past loss experience, available industry data and projections as to future claims frequency, severity, inflationary trends and settlement patterns. Estimating the reserve, particularly the reserve appropriate for liability exposures, is a complex process. Claims may be resolved over an extended period of time, often five years or more, and may be subject to litigation. Estimating losses requires ProAssurance to make and revise judgments and assessments regarding multiple uncertainties over an extended period of time. As a result, the reserve estimate may vary considerably from the eventual outcome. The assumptions used in establishing ProAssurance’s reserve are regularly reviewed and updated by management as new data becomes available. Changes to estimates of previously established reserves are included in earnings in the period in which the estimate is changed.

ProAssurance believes that the methods it uses to establish reserves are reasonable and appropriate. Each year, ProAssurance uses internal actuaries to review the reserve for losses of each insurance subsidiary. ProAssurance also engages consulting actuaries to review ProAssurance claims data and provide observations regarding cost trends, rate adequacy and ultimate loss costs. ProAssurance considers the views of the actuaries as well as other factors, such as known, anticipated or estimated changes in frequency and severity of claims, loss retention levels and premium rates, in establishing the amount of its reserve for losses. The statutory filings of each insurance company with the insurance regulators must be accompanied by a consulting actuary's certification as to their respective reserves.

ProAssurance partitions its reserve by accident year, which is the year in which the claim becomes its liability. As claims are incurred (reported) and claim payments are made, they are aggregated by accident year for analysis purposes. ProAssurance also partitions its reserve by reserve type: case reserves and IBNR reserves. Case reserves are established by the claims department based upon the particular circumstances of each reported claim and represent ProAssurance’s estimate of the future loss costs (often referred to as expected losses) that will be paid on reported claims. Case reserves are decremented as claim payments are made and are periodically adjusted upward or downward as estimates regarding the amount of future losses are revised; a reported loss for an individual claim equates to the case reserve at any point in time plus the claim payments that have been made to date. IBNR reserves represent an estimate, in the aggregate, of future development on losses that have been reported to ProAssurance plus an estimate of losses that have been incurred but not reported.

Development of Prior Accident Years

In addition to setting the initial reserve for the current accident year, each period ProAssurance reassesses the amount of reserve required for prior accident years. The foundation of ProAssurance’s reserve re-estimation process is an actuarial analysis that is performed by both the internal and consulting actuaries. This detailed analysis projects ultimate losses based on partitions which include line of business, geography, coverage layer and accident year. The procedure uses the most representative data for each partition, capturing its unique patterns of development and trends. In all, there are 200 different partitions of ProAssurance's business for purposes of this analysis. ProAssurance believes that the use of consulting actuaries provides an independent view of the loss data as well as a broader perspective on industry loss trends.

Activity in the reserve for losses and loss adjustment expenses is summarized as follows:

(In thousands)	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017			Year Ended December 31, 2017
Balance, beginning of year	$	2,048,381		$	1,993,428		$	1,993,428
Less reinsurance recoverables on unpaid losses and loss adjustment expenses	335,585			273,475			273,475
Net balance, beginning of year	1,712,796			1,719,953			1,719,953
Net losses:
Current year	152,572			147,927			603,518
Favorable development of reserves established in prior years, net	(22,786		)	(28,776		)	(134,360		)
Total	129,786			119,151			469,158
Paid related to:
Current year	(14,243		)	(33,085		)	(106,633		)
Prior years	(101,078		)	(80,709		)	(369,682		)
Total paid	(115,321		)	(113,794		)	(476,315		)
Net balance, end of period	1,727,261			1,725,310			1,712,796
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses	329,540			271,679			335,585
Balance, end of period	$	2,056,801		$	1,996,989		$	2,048,381

The favorable loss development of $22.8 million recognized in the three months endedMarch 31, 2018 primarily reflected a lower than anticipated claims severity trend (i.e., the average size of a claim) for accident years 2011 through 2015. The favorable loss development of $28.8 million recognized in the three months endedMarch 31, 2017 primarily reflected a lower than anticipated claims severity trend for accident years 2009 through 2014. The favorable loss development of $134.4 million recognized in the twelve months ended December 31, 2017 primarily reflected a lower than anticipated claims severity trend for accident years 2010 through 2014.

For additional information regarding ProAssurance's reserve for losses, see Note 1 and Note 7 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

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Commitments and Contingencies

3 Months Ended

Mar. 31, 2018

Commitments and Contingencies Disclosure [Abstract]

Commitments and Contingencies

Commitments and Contingencies

ProAssurance is involved in various legal actions related to insurance policies and claims handling including, but not limited to, claims asserted by policyholders. These types of legal actions arise in the Company's ordinary course of business and, in accordance with GAAP for insurance entities, are considered as a part of the Company's loss reserving process, which is described in detail under the heading "Losses and Loss Adjustment Expenses" in the Accounting Policies section in Note 1 of the Notes to Consolidated Financial Statements in ProAssurance's 2017 Form 10-K.

As a member of Lloyd's, ProAssurance is required to provide capital to support its Lloyd's Syndicates through 2022 of up to $200 million, referred to as FAL. At March 31, 2018, ProAssurance is satisfying the FAL requirement with investment securities on deposit with Lloyd's with a carrying value of $123.9 million (see Note 3).

ProAssurance has issued an unconditional revolving credit agreement to the Premium Trust Fund of Syndicate 1729 for the purpose of providing working capital. Permitted borrowings were expanded from £20.0 million to £30.0 million under an amended Syndicate Credit Agreement executed in February 2018. Under the amended Syndicate Credit Agreement, advances bear interest at 3.8% annually and may be repaid at any time but are repayable upon demand after December 31, 2019. As of March 31, 2018, the unused commitment under the Syndicate Credit Agreement approximated £3.3 million (approximately $4.6 million).

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Debt

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Debt

Debt

ProAssurance’s outstanding debt consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
Senior Notes due 2023, unsecured, interest at 5.3% annually	$	250,000	$	250,000
Revolving Credit Agreement, outstanding borrowings are fully secured, see Note 3, and carried at a weighted average interest rate of 2.24% and 1.91%, respectively. Outstanding borrowings are not permitted to exceed $250 million aggregately; Revolving Credit Agreement expires in 2020. The interest rate on the borrowings is set at the time the respective borrowing is initiated or renewed. The current borrowing can be repaid or renewed in the second quarter of 2018. If renewed, the interest rate will be reset.	83,000		123,000
Mortgage Loans, outstanding borrowings are secured by first priority liens on two office buildings, and bear an interest rate of three-month LIBOR plus 1.325% (3.42% and 2.86%, respectively) determined on a quarterly basis.	40,111		40,460
Total principal	373,111		413,460
Less debt issuance costs	1,583		1,649
Debt less debt issuance costs	$	371,528	$	411,811

Covenant Compliance

There are no financial covenants associated with the Senior Notes due 2023.

The Revolving Credit Agreement contains customary representations, covenants and events constituting default, and remedies for default. The Revolving Credit Agreement also defines financial covenants regarding permitted leverage ratios. ProAssurance is currently in compliance with all covenants of the Revolving Credit Agreement.

The Mortgage Loans contain customary representations, covenants and events constituting default, and remedies for default. The Mortgage Loans also define a financial covenant regarding a permitted leverage ratio for each of the two ProAssurance subsidiaries that entered into the Mortgage Loans. ProAssurance's subsidiaries are currently in compliance with the financial covenant of the Mortgage Loans.

Additional Information

For additional information regarding ProAssurance's debt, see Note 9 of the Notes to Consolidated Financial Statements included in ProAssurance's December 31, 2017 Form 10-K.

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Derivatives

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Derivatives

Derivatives

ProAssurance is exposed to certain risks relating to its ongoing business and investment activities. ProAssurance utilizes derivative instruments as part of its risk management strategy to reduce the market risk related to fluctuations in future interest rates associated with a portion of its variable-rate debt. As of March 31, 2018, ProAssurance has not designated any derivative instruments as hedging instruments and does not use derivative instruments for trading purposes.

ProAssurance utilizes an interest rate cap agreement with the objective of reducing the Company's exposure to interest rate risk related to its variable-rate Mortgage Loans. Additional information regarding the Company's Mortgage Loans is provided in Note 7. Under the terms of the interest rate cap agreement, ProAssurance paid a premium of $2 million in the fourth quarter of 2017 for the right to receive cash payments based upon a notional amount of $35 million if and when the three-month LIBOR rises above 235 basis points. The Company's variable-rate Mortgage Loans bear an interest rate of three-month LIBOR plus 132.5 basis points. Therefore, this derivative instrument is effectively ensuring the interest rate related to the Mortgage Loans is capped at a maximum of 367.5 basis points until expiration of the interest rate cap agreement in October 2027. ProAssurance has designated the interest rate cap as an economic hedge (non-hedging instrument) of interest rate exposure and any change in fair value of the derivative is immediately recognized in earnings during the period of change.

The following table provides a summary of the volume and fair value position of the interest rate cap as well as the reporting location in the Condensed Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017.

($ in thousands)		March 31, 2018					December 31, 2017
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Balance Sheets	Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)		Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)
Interest Rate Cap	Other assets	1	$	35,000	$	2,306	1	$	35,000	$	1,731
(1) Volume is represented by the derivative instrument's notional amount.
(2) Additional information regarding the fair value of the Company's interest rate cap is provided in Note 2.

The following table presents the pre-tax impact of the change in the fair value of the interest rate cap and the reporting location in the Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2018 and 2017.

		Gains (Losses) Recognized in Income on Derivatives
(In thousands)		Three Months Ended March 31
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Statements of Income and Comprehensive Income	2018		2017
Interest Rate Cap	Interest expense	$	575	$	—

As a result of this derivative instrument, ProAssurance is exposed to risk that the counterparty will fail to meet their contractual obligations. To mitigate this counterparty credit risk, ProAssurance only enters into derivative contracts with carefully selected major financial institutions based upon their credit ratings and monitors their creditworthiness. As of March 31, 2018, the counterparty had an investment grade rating of BBB- and has performed in accordance with their contractual obligations.

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Shareholders' Equity

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Shareholders' Equity

Shareholders’ Equity

At March 31, 2018 and December 31, 2017, ProAssurance had 100 million shares of authorized common stock and 50 million shares of authorized preferred stock. The Board has the authority to determine provisions for the issuance of preferred shares, including the number of shares to be issued, the designations, powers, preferences and rights, and the qualifications, limitations or restrictions of such shares. To date, the Board has not approved the issuance of preferred stock.

ProAssurance declared cash dividends of $0.31 per share during the first quarters of both 2018 and 2017, totaling $16.6 million and $16.5 million, respectively.

At March 31, 2018, Board authorizations for the repurchase of common shares or the retirement of outstanding debt of $109.6 million remained available for use. ProAssurance did not repurchase any common shares during the three months endedMarch 31, 2018 and 2017.

Share-based compensation expense and related tax benefits were as follows:

	Three Months Ended March 31
(In thousands)	2018		2017
Share-based compensation expense	$	902	$	3,346
Related tax benefits	$	190	$	1,171

ProAssurance awarded approximately 85,800 restricted share units and 27,200 base performance share units to employees in February 2018. The fair value of each unit awarded was estimated at $44.73, equal to the market value of a ProAssurance common share on the date of grant less the estimated present value of dividends during the vesting period. All awards are charged to expense as an increase to additional paid-in capital over the service period (generally the vesting period) associated with the award. Restricted share units and performance share units vest in their entirety at the end of a three-year period following the grant date based on a continuous service requirement and, for performance share units, achievement of a performance objective. Partial vesting is permitted for retirees. A ProAssurance common share is issued for each unit once vesting requirements are met, except that units sufficient to satisfy required tax withholdings are paid in cash. The number of common shares issued for performance share units varies from 50% to 200% of base awards depending upon the degree to which stated performance objectives are achieved. ProAssurance issued approximately 52,800 and 80,600 common shares to employees in February 2018 related to restricted share units and performance share units, respectively, granted in 2015. Performance share units for the 2015 award were issued at a level of 125%.

ProAssurance issued approximately 2,500 common shares to employees in February 2018 as bonus compensation, as approved by the Compensation Committee of the Board. The shares issued were valued at fair value (the market price of a ProAssurance common share on the date of award).

Other Comprehensive Income (Loss) and Accumulated Other Comprehensive Income (Loss)

For the three months endedMarch 31, 2018 and 2017, OCI was almost entirely comprised of unrealized gains and losses, including non-credit impairment losses, arising during the period related to fixed maturity available-for-sale securities, less reclassification adjustments, as shown in the table that follows, net of tax. For the three months endedMarch 31, 2018 and 2017, OCI included changes related to the reestimation of the defined benefit plan liability assumed in the Eastern acquisition which were nominal in amount. The defined benefit plan is frozen as to the earnings of additional benefits and the benefit plan liability is reestimated annually.

At March 31, 2018 and December 31, 2017, AOCI was almost entirely comprised of accumulated unrealized gains and losses from fixed maturity available-for-sale securities, including accumulated non-credit impairments recognized through OCI of $0.6 million and $0.5 million, respectively, net of tax. At March 31, 2018 and December 31, 2017, accumulated changes in the defined benefit plan liability not yet recognized in earnings were nominal in amount. Due to the adoption of accounting guidance in the first quarter of 2018 related to certain impacts of the TCJA, ProAssurance increased AOCI by approximately $3.4 million with a corresponding decrease to retained earnings of the same amount as of the beginning of 2018. See Note 1 for additional information on accounting guidance adopted during the period. At March 31, 2018 and December 31, 2017, tax effects were computed using the enacted federal corporate tax rate of 21% and 35%, respectively, with the exception of unrealized gains and losses on available-for-sale securities held at our U.K. and Cayman Islands entities which in both periods were immaterial in amount.

Amounts reclassified from AOCI to net income and the amounts of deferred tax expense (benefit) included in OCI were as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Reclassifications from AOCI to net income:
Realized investment gains (losses)	$	2,417		$	1,616
Tax effect*	(508		)	(566		)
Net reclassification adjustments	$	1,909		$	1,050
Deferred tax expense (benefit) included in OCI	$	(7,060	)	$	1,481
* Tax effects were computed using a 21% and 35% rate for the three months ended March 31, 2018 and 2017, respectively.

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Variable Interest Entities

3 Months Ended

Mar. 31, 2018

Variable Interest Entities [Abstract]

Variable Interest Entities

Variable Interest Entities

ProAssurance holds passive interests in a number of entities that are considered to be VIEs under GAAP guidance. ProAssurance's VIE interests principally consist of interests in LPs/LLCs formed for the purpose of achieving diversified equity and debt returns. At March 31, 2018, ProAssurance's VIE interests totaled $316.3 million carried as a part of investment in unconsolidated subsidiaries.

ProAssurance does not have power over the activities that most significantly impact the economic performance of these VIEs and thus is not the primary beneficiary. Therefore, ProAssurance has not consolidated these VIEs. ProAssurance’s involvement with each VIE is limited to its direct ownership interest in the VIE. Except for the funding commitments disclosed in Note 6, ProAssurance has no arrangements with any of the VIEs to provide other financial support to or on behalf of the VIE. At March 31, 2018, ProAssurance’s maximum loss exposure relative to these investments was limited to the carrying value of ProAssurance’s investment in the VIE.

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Earnings Per Share

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Diluted weighted average shares is calculated as basic weighted average shares plus the effect, calculated using the treasury stock method, of assuming that restricted share units, performance share units and purchase match units have vested. The following table provides the weighted average number of common shares outstanding used in the calculation of the Company's basic and diluted earnings per share:

(In thousands, except per share data)	Three Months Ended March 31
	2018		2017
Weighted average number of common shares outstanding, basic	53,515		53,315
Dilutive effect of securities:
Restricted Share Units	82		78
Performance Share Units	66		121
Purchase Match Units	19		21
Weighted average number of common shares outstanding, diluted	53,682		53,535
Effect of dilutive shares on earnings per share	$	—	$	(0.01	)

All dilutive common share equivalents are reflected in the earnings per share calculation while antidilutive common share equivalents are not reflected in the earnings per share calculation. There were no common share equivalents that were antidilutive for the three months endedMarch 31, 2018 or 2017.

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Segment Information

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Segment Information

Segment Information

ProAssurance operates in four segments that are organized around the nature of the products and services provided: Specialty P&C, Workers' Compensation, Lloyd's Syndicate and Corporate. A description of each segment follows.

Specialty P&C is primarily focused on professional liability insurance and medical technology liability insurance. Professional liability insurance is primarily offered to healthcare providers and institutions and to attorneys and their firms. Medical technology liability insurance is offered to medical technology and life sciences companies that manufacture or distribute products including entities conducting human clinical trials. Prior to 2018, the Specialty P&C segment ceded certain premium to the Lloyd's Syndicate segment under a quota share agreement with Syndicate 1729; however, this agreement was not renewed on January 1, 2018. As discussed below, the Lloyd's Syndicate segment results are typically reported on a quarter delay. For consistency purposes, results from this ceding arrangement, other than cash receipts or disbursements, have been reported within the Specialty P&C segment on the same one-quarter delay.

Workers' Compensation provides workers' compensation products primarily to employers with 1,000 or fewer employees. The segment also offers alternative market solutions whereby policies written are 100% ceded either to captive insurers unaffiliated with ProAssurance or to SPCs operated by wholly owned subsidiaries of ProAssurance. Each SPC is owned, fully or in part, by an agency, group or association. Operating results (underwriting profit or loss, plus investment results reported in the Corporate segment) of the SPCs are due to the owners of that cell.

During the first quarter of 2018, ProAssurance reorganized its Cayman Islands SPC operations. Beginning in 2018, all new and renewing alternative market business previously ceded to the SPCs at Eastern Re, with the exception of one program, is now ceded to SPCs operated by a newly formed wholly owned Cayman Islands subsidiary, Inova Re. As part of the reorganization, all SPCs previously operated by Eastern Re, with the exception of one program, ceased assuming new and renewing business on or after January 1, 2018. The external cell owners' cumulative undistributed earnings and the results of all SPCs for the current period due to external cell owners continue to be reported as SPC dividends payable and SPC dividend expense, respectively.

Lloyd'sSyndicate includes operating results from ProAssurance's 58% participation in Lloyd's of London Syndicate 1729. Syndicate 1729 underwrites risks over a wide range of property and casualty insurance and reinsurance lines in both the U.S. and international markets. The results of this segment are reported on a quarter delay, except when information is available that is material to the current period. Furthermore, investment results associated with the majority of investment assets solely allocated to Lloyd's Syndicate operations and certain U.S. paid administrative expenses are reported concurrently as that information is available on an earlier time frame. Beginning in 2018, ProAssurance increased its participation in the operating results of Syndicate 1729 from 58% to 62% and began its 100% participation in the operating results of Syndicate 6131 effective January 1, 2018; however, due to the quarter delay these changes will not be reflected in the Lloyd's Syndicate segment results until the second quarter of 2018. Syndicate 6131, a newly formed SPA, focuses on contingency and specialty property business.

Corporate includes ProAssurance's investment operations, interest expense and U.S. income taxes, all of which are managed at the corporate level with the exception of investment assets solely allocated to Lloyd's Syndicate operations as discussed above. The segment also includes non-premium revenues generated outside of the Company's insurance entities and corporate expenses.

The accounting policies of the segments are the same as those described in Note 1 of the Notes to Consolidated Financial Statements in ProAssurance’s December 31, 2017 report on Form 10-K and Note 1 of the Notes to Condensed Consolidated Financial Statements. ProAssurance evaluates performance of its Specialty P&C and Workers' Compensation segments based on before tax underwriting profit or loss, which excludes investment performance. Performance of the Lloyd's Syndicate segment is evaluated based on underwriting profit or loss, plus investment results of investment assets solely allocated to Lloyd's Syndicate operations, net of U.K. income tax expense. Performance of the Corporate segment is evaluated based on the contribution made to consolidated after-tax results. ProAssurance accounts for inter-segment transactions as if the transactions were to third parties at current market prices. Assets are not allocated to segments because investments and other assets are not managed at the segment level.

Financial results by segment were as follows:

	Three Months Ended March 31, 2018
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	116,276		$	58,407		$	12,476		$	—		$	—		$	187,159
Net investment income	—			—			751			21,276			—			22,027
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,640			—			1,640
Net realized gains (losses)	—			—			(54		)	(12,463		)	—			(12,517		)
Other income (expense)	1,256			366			331			943			(173		)	2,723
Net losses and loss adjustment expenses	(84,585		)	(36,715		)	(8,486		)	—			—			(129,786		)
Underwriting, policy acquisition and operating expenses	(28,276		)	(17,333		)	(7,246		)	(4,678		)	173			(57,360		)
Segregated portfolio cells dividend (expense) income	30			(1,894		)	—			117			—			(1,747		)
Interest expense	—			—			—			(3,705		)	—			(3,705		)
Income tax benefit (expense)	—			—			(6		)	3,428			—			3,422
Segment operating results	$	4,701		$	2,831		$	(2,234	)	$	6,558		$	—		$	11,856
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,867		$	956		$	(1	)	$	3,257		$	—		$	6,079

	Three Months Ended March 31, 2017
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	113,058		$	55,283		$	14,562		$	—		$	—		$	182,903
Net investment income	—			—			372			22,814			—			23,186
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,808			—			1,808
Net realized gains (losses)	—			—			27			13,253			—			13,280
Other income (expense)	1,198			145			391			173			(86		)	1,821
Net losses and loss adjustment expenses	(74,994		)	(34,650		)	(9,507		)	—			—			(119,151		)
Underwriting, policy acquisition and operating expenses	(25,977		)	(16,691		)	(6,211		)	(8,315		)	86			(57,108		)
Segregated portfolio cells dividend (expense) income	28			(1,174		)	—			(1,229		)	—			(2,375		)
Interest expense	—			—			—			(4,133		)	—			(4,133		)
Income tax benefit (expense)	—			—			7			1,217			—			1,224
Segment operating results	$	13,313		$	2,913		$	(359	)	$	25,588		$	—		$	41,455
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,911		$	837		$	(3	)	$	5,058		$	—		$	7,803

The following table provides detailed information regarding ProAssurance's gross premiums earned by product as well as a reconciliation to net premiums earned. All gross premiums earned are from external customers except as noted. ProAssurance's insured risks are primarily within the U.S.

	Three Months Ended March 31
(In thousands)	2018			2017
Specialty P&C Segment
Gross premiums earned:
Healthcare professional liability	$	118,685		$	117,051
Legal professional liability	6,391			6,317
Medical technology liability	8,512			8,312
Other	110			102
Ceded premiums earned	(17,422		)	(18,724		)
Segment net premiums earned	116,276			113,058
Workers' Compensation Segment
Gross premiums earned:
Traditional business	46,030			41,768
Alternative market business	19,381			19,446
Ceded premiums earned	(7,004		)	(5,931		)
Segment net premiums earned	58,407			55,283
Lloyd's Syndicate Segment
Gross premiums earned:
Property and casualty*	17,967			17,185
Ceded premiums earned	(5,491		)	(2,623		)
Segment net premiums earned	12,476			14,562
Consolidated net premiums earned	$	187,159		$	182,903

*Includes premium assumed from the Specialty P&C segment of $1.9 million for the three months endedMarch 31, 2018 and $3.5 million for the same respective period of 2017.

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Basis of Presentation (Policies)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Presentation

Basis of Presentation

The accompanying unaudited Condensed Consolidated Financial Statements include the accounts of ProAssurance Corporation and its consolidated subsidiaries (ProAssurance, PRA or the Company). The financial statements have been prepared in accordance with GAAP for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and notes required by GAAP for complete financial statements. In the opinion of management, all adjustments considered necessary for a fair presentation, consisting of normal recurring adjustments, have been included. ProAssurance’s results for the three months endedMarch 31, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. The accompanying Condensed Consolidated Financial Statements should be read in conjunction with the Consolidated Financial Statements and Notes contained in ProAssurance’s December 31, 2017 report on Form 10-K. In connection with its preparation of the Condensed Consolidated Financial Statements, ProAssurance evaluated events that occurred subsequent to March 31, 2018 for recognition or disclosure in its financial statements and notes to financial statements.

ProAssurance operates in four reportable segments as follows: Specialty P&C, Workers' Compensation, Lloyd's Syndicate and Corporate. For more information on the nature of products and services provided and for financial information by segment, refer to Note 12.

Reclassifications

Reclassifications

In the second quarter of 2017, ProAssurance began presenting separately the components of underwriting, policy acquisition and operating expense as operating expense and DPAC amortization on the Condensed Consolidated Statements of Income and Comprehensive Income in order to provide additional details for investors. The Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2017 have been reclassified to conform to the current period presentation. Total underwriting, policy acquisition and operating expense as well as net income for the three months endedMarch 31, 2017 was not affected by the change in presentation.

Certain other insignificant prior period amounts have been reclassified to conform to the current period presentation.

Accounting Changes Adopted and Not Yet Adopted

Accounting Changes Adopted

Restricted Cash (ASU 2016-18)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of restricted cash presented in the statement of cash flows with the objective of reducing diversity in practice. Under the new guidance, entities are required to include restricted cash and restricted cash equivalents with cash and cash equivalents when reconciling beginning-of-period and end-of-period total amounts as presented on the statement of cash flows. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Intra-Entity Transfers of Assets Other than Inventory (ASU 2016-16)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards related to the income tax consequences of intra-entity transfers of assets other than inventory between tax-paying components. A tax-paying component is an individual entity or group of entities that is consolidated for tax purposes. Under the new guidance, entities are required to recognize income tax consequences of an intra-entity transfer of assets other than inventory when the transfer occurs instead of delaying recognition until the asset has been sold to an outside party. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Classification of Certain Cash Receipts and Cash Payments (ASU 2016-15)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance related to the classification of certain cash receipts and cash payments presented in the statement of cash flows with the objective of reducing diversity in practice. ProAssurance adopted the guidance as of January 1, 2018 and elected to use the cumulative earnings approach for presenting distributions from equity method investees. Adoption of the guidance had no material effect on ProAssurance’s results of operations or financial position; however, ProAssurance reclassified approximately $10.9 million in distributions from unconsolidated subsidiaries from investing activities to operating activities in the Condensed Consolidated Statement of Cash Flows for the three months endedMarch 31, 2017.

Revenue from Contracts with Customers (ASU 2014-09)

Effective for fiscal years beginning after December 15, 2017 the FASB issued guidance related to revenue from contracts with customers. The core principle of the new guidance is that revenue is recognized to depict the transfer of promised goods or services to customers in an amount that reflects the consideration to which the entity expects to be entitled in exchange for those goods or services. ProAssurance adopted the guidance as of January 1, 2018 under the modified retrospective method. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Recognition and Measurement of Financial Assets and Financial Liabilities (ASU 2016-01)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance that requires equity investments (except those accounted for under the equity method of accounting, or those that result in consolidation of the investee) to be measured at fair value with changes in fair value recognized in net income. The new guidance also specifies that an entity use the exit price notion when measuring the fair value of financial instruments for disclosure purposes and present financial assets and liabilities by measurement category and form of financial asset. Other provisions of the new guidance include: revised disclosure requirements related to the presentation in comprehensive income of changes in the fair value of liabilities; elimination, for public companies, of disclosure requirements relative to the methods and significant assumptions underlying fair values disclosed for financial instruments measured at amortized cost; and simplified impairment assessments for equity investments without readily determinable fair values. ProAssurance adopted the guidance as of January 1, 2018 using a modified retrospective application and recorded a cumulative-effect after-tax adjustment of approximately $8.3 million to beginning retained earnings in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Modification Accounting for Employee Share-Based Payment Awards (ASU 2017-09)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years, the FASB issued guidance which reduces the complexity in accounting standards when there is a change in the terms or conditions of a share-based payment award. The new guidance clarifies that an entity should apply the modification accounting guidance if the value, vesting conditions or classification of the award changes. ProAssurance adopted the guidance as of January 1, 2018. Adoption of the guidance had no material effect on ProAssurance’s results of operations, financial position or cash flows.

Reclassification of Certain Tax Effects from AOCI (ASU 2018-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, with early adoption permitted, the FASB issued guidance which permits a reclassification from AOCI to retained earnings for stranded tax effects resulting from the newly enacted federal corporate tax rate from the TCJA. The amount of the reclassification from AOCI to retained earnings will be the difference between the historical corporate tax rate and the newly enacted 21% corporate tax rate on deferred tax items originally established through OCI and not net income. The guidance allows entities to adopt in any interim or annual period for which financial statements have not yet been issued and apply the guidance either (1) in the period of adoption or (2) retrospectively to each period in which the effect of the change in the tax rate is recognized. ProAssurance adopted this guidance as of January 1, 2018 and elected to apply this guidance in the period of adoption using the specific identification method. Using a modified retrospective application, ProAssurance recorded a cumulative-effect adjustment which increased beginning AOCI by approximately $3.4 million and decreased beginning retained earnings by the same amount in the Condensed Consolidated Statement of Changes in Capital for the three months endedMarch 31, 2018. Adoption of this guidance had no material effect on ProAssurance's financial position, results of operations or cash flows.

Accounting Changes Not Yet Adopted

Technical Corrections and Improvements to Financial Instruments - Overall (ASU 2018-03)

Effective for fiscal years beginning after December 15, 2017 and interim periods within those fiscal years beginning after June 15, 2018, the FASB amended the new standard on recognizing and measuring financial assets and financial liabilities to clarify certain aspects of the guidance. Under the amended guidance, an entity that uses the measurement alternative for equity investments without readily determinable fair values can change its measurement approach to a fair value method through an irrevocable election that would apply to that security and all identical or similar investments of the same issuer. Also, entities are required to use the prospective transition approach only for equity investments they elect to measure using the new measurement alternative. Additionally, the guidance clarifies how to apply the measurement alternative and presentation requirements for financial liabilities measured under the fair value option. ProAssurance plans to adopt the guidance beginning July 1, 2018. As of March 31, 2018, ProAssurance does not have any equity investments without readily determinable fair values or financial liabilities measured under the fair value option; therefore, adoption of the guidance is not expected to have a material effect on ProAssurance’s financial position, results of operations or cash flows.

Leases (ASU 2016-02)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that requires a lessee to recognize for all leases (with the exception of short-term leases) a lease liability, which is a lessee's obligation to make lease payments arising from a lease, measured on a discounted basis, and a right-of-use asset, which is an asset that represents the lessee's right to use, or control the use of, a specified asset for the lease term. ProAssurance plans to adopt the guidance beginning January 1, 2019 and is currently in the process of evaluating all of its leases. As the majority of ProAssurance's leases are real estate operating leases and are not considered to be material, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Premium Amortization on Purchased Callable Debt Securities (ASU 2017-08)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance that will require the premium for certain callable debt securities to be amortized over a shorter period than is currently required. Currently amortization is permitted over the contractual life of the instrument and the guidance shortens the amortization to the earliest call date. The purpose of the guidance is to more closely align the amortization period of premiums to expectations incorporated in market pricing on the underlying securities. ProAssurance plans to adopt the guidance beginning January 1, 2019. As ProAssurance amortizes premium on callable debt securities to the earliest call date, adoption of the guidance is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Derivatives and Hedging (ASU 2017-12)

Effective for fiscal years beginning after December 15, 2018 and interim periods within those fiscal years, the FASB issued guidance to improve financial reporting of hedging relationships to better portray the entity's risk management activities in the consolidated financial statements. The new guidance eliminates the requirement to separately measure and report hedge ineffectiveness and requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. ProAssurance plans to adopt the guidance beginning January 1, 2019. ProAssurance's derivative instrument at March 31, 2018 is not designated as a hedging instrument; therefore, adoption is not expected to have a material effect on ProAssurance's results of operations, financial position or cash flows.

Improvements to Financial Instruments - Credit Losses (ASU 2016-13)

Effective for fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that replaces the incurred loss impairment methodology, which delays recognition of credit losses until a probable loss has been incurred, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to inform credit loss estimates. Under the new guidance, credit losses are required to be recorded through an allowance for credit losses account and the income statement reflects the measurement for newly recognized financial assets, as well as increases or decreases of expected credit losses that have taken place during the period. ProAssurance is in the process of evaluating the effect the new guidance would have on its results of operations and financial position and plans to adopt the guidance beginning January 1, 2020.

Simplifying the Test for Goodwill Impairment (ASU 2017-04)

Effective for the fiscal years beginning after December 15, 2019 and interim periods within those fiscal years, the FASB issued guidance that simplifies the requirements to test goodwill for impairment for business entities that have goodwill reported in their financial statements. The guidance eliminates the second step of the impairment test which measures a goodwill impairment loss by comparing the implied fair value of a reporting unit's goodwill with the carrying amount. In addition, the guidance also eliminates the requirements for any reporting unit with a zero or negative carrying amount to perform a qualitative assessment. ProAssurance plans to adopt the guidance beginning January 1, 2020. Adoption is not expected to have a material effect on ProAssurance’s results of operations, financial position or cash flows.

Fair Value Policy

The fair values for securities included in the Level 2 category, with the few exceptions described below, were developed by one of several third party, nationally recognized pricing services, including services that price only certain types of securities. Each service uses complex methodologies to determine values for securities and subject the values they develop to quality control reviews. Management selected a primary source for each type of security in the portfolio and reviewed the values provided for reasonableness by comparing data to alternate pricing services and to available market and trade data. Values that appeared inconsistent were further reviewed for appropriateness. Any value that did not appear reasonable was discussed with the service that provided the value and adjusted, if necessary. There were no material changes to the values supplied by the pricing services during the three months endedMarch 31, 2018 and 2017.

Level 2 Valuations

Below is a summary description of the valuation methodologies primarily used by the pricing services for securities in the Level 2 category, by security type:

U.S. Treasury obligations were valued based on quoted prices for identical assets, or, in markets that are not active, quotes for similar assets, taking into consideration adjustments for variations in contractual cash flows and yields to maturity.

U.S. Government-sponsored enterprise obligations were valued using pricing models that consider current and historical market data, normal trading conventions, credit ratings, and the particular structure and characteristics of the security being valued, such as yield to maturity, redemption options, and contractual cash flows. Adjustments to model inputs or model results were included in the valuation process when necessary to reflect recent regulatory, government or corporate actions or significant economic, industry or geographic events affecting the security’s fair value.

State and municipal bonds were valued using a series of matrices that considered credit ratings, the structure of the security, the sector in which the security falls, yields, and contractual cash flows. Valuations were further adjusted, when necessary, to reflect the expected effect on fair value of recent significant economic or geographic events or ratings changes.

Corporate debt, multiple observable inputs consisted primarily of corporate bonds, but also included a small number of bank loans. The methodology used to value Level 2 corporate bonds was the same as the methodology previously described for U.S. Government-sponsored enterprise obligations. Bank loans were valued based on an average of broker quotes for the loans in question, if available. If quotes were not available, the loans were valued based on quoted prices for comparable loans or, if the loan was newly issued, by comparison to similar seasoned issues. Broker quotes were compared to actual trade prices to permit assessment of the reliability of the quotes; unreliable quotes were not considered in quoted averages.

Residential and commercial mortgage-backed securities were valued using a pricing matrix which considers the issuer type, coupon rate and longest cash flows outstanding. The matrix used was based on the most recently available market information. Agency and non-agency collateralized mortgage obligations were both valued using models that consider the structure of the security, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data.

Other asset-backed securities were valued using models that consider the structure of the security, monthly payment information, current and historical information regarding prepayment speeds, ratings and ratings updates, and current and historical interest rate and interest rate spread data. Spreads and prepayment speeds consider collateral type.

Short-term investments were securities maturing within one year, carried at cost which approximated the fair value of the security due to the short term to maturity.

Other investments consisted primarily of convertible bonds valued using a pricing model that incorporated selected dealer quotes as well as current market data regarding equity prices and risk free rates. If dealer quotes were unavailable for the security being valued, quotes for securities with similar terms and credit status were used in the pricing model. Dealer quotes selected for use were those considered most accurate based on parameters such as underwriter status and historical reliability.

Other assets consisted of an interest rate cap derivative instrument valued using a model which considers the volatilities from other instruments with similar maturities, strike prices, durations and forward yield curves.

Level 3 Valuations

Below is a summary description of the valuation processes and methodologies used as well as quantitative information regarding securities in the Level 3 category.

Level 3 Valuation Processes

• Level 3 securities are priced by the Chief Investment Officer.

• Level 3 valuations are computed quarterly. Prices are evaluated quarterly against prior period prices and the expected change in prices.

• ProAssurance's Level 3 securities are primarily NRSRO rated debt instruments for which comparable market inputs are commonly available for evaluating the securities in question. Valuation of these debt instruments is not overly sensitive to changes in the unobservable inputs used.

Level 3 Valuation Methodologies

Corporate debt, limited observable inputs consisted of corporate bonds valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 87% of the securities were rated and the average rating was BBB. At December 31, 2017, 84% of the securities were rated and the average rating was BBB+.

Residential mortgage-backed and other asset-backed securities consisted of securitizations of receivables valued using dealer quotes for similar securities or discounted cash flow models using yields currently available for similar securities. Similar securities are defined as securities of comparable credit quality that have like terms and payment features. Assessments of credit quality were based on NRSRO ratings, if available, or were subjectively determined by management if not available. At March 31, 2018, 78% of the securities were rated and the average rating was AAA. At December 31, 2017, 21% of the securities were rated and the average rating was AAA.

Other investments consisted of convertible securities for which limited observable inputs were available at March 31, 2018 and December 31, 2017. The securities were valued internally based on expected cash flows, including the expected final recovery, discounted at a yield that considered the lack of liquidity and the financial status of the issuer.

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Basis of Presentation (Tables)

3 Months Ended

Mar. 31, 2018

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Other Liabilities

Other liabilities consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
SPC dividends payable	$	47,122	$	46,925
Unpaid dividends	16,616		267,292
All other	144,128		123,383
Total other liabilities	$	207,866	$	437,600

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Fair Value Measurement (Tables)

3 Months Ended

Mar. 31, 2018

Fair Value Disclosures [Abstract]

Assets and liabilities measured at fair value

Fair values of assets measured at fair value on a recurring basis as of March 31, 2018 and December 31, 2017 are shown in the following tables. Where applicable, the tables also indicate the fair value hierarchy of the valuation techniques utilized to determine those fair values. For some assets, the inputs used to measure fair value may fall into different levels of the fair value hierarchy. When this is the case, the asset is categorized based on the level of the most significant input to the fair value measurement. Assessments of the significance of a particular input to the fair value measurement require judgment and consideration of factors specific to the assets being valued.

	March 31, 2018
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	129,751	$	—	$	129,751
U.S. Government-sponsored enterprise obligations	—		29,959		—		29,959
State and municipal bonds	—		329,995		—		329,995
Corporate debt, multiple observable inputs	2,334		1,230,832		—		1,233,166
Corporate debt, limited observable inputs	—		—		15,097		15,097
Residential mortgage-backed securities	—		215,420		—		215,420
Agency commercial mortgage-backed securities	—		14,887		—		14,887
Other commercial mortgage-backed securities	—		29,195		—		29,195
Other asset-backed securities	—		138,890		17,323		156,213
Fixed maturities, trading
Corporate debt	—		4,148		—		4,148
Equity investments
Financial	74,556		—		—		74,556
Utilities/Energy	46,637		—		—		46,637
Consumer oriented	54,789		—		—		54,789
Industrial	48,859		—		—		48,859
Bond funds	153,256		—		—		153,256
All other	93,847		—		—		93,847
Short-term investments	288,019		61,100		—		349,119
Other investments	604		32,073		365		33,042
Other assets	—		2,306		—		2,306
Total assets categorized within the fair value hierarchy	$	762,901	$	2,218,556	$	32,785	3,014,242
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Equity investments							20,215
Investment in unconsolidated subsidiaries							277,094
Total assets at fair value							$	3,311,551

	December 31, 2017
	Fair Value Measurements Using						Total
(In thousands)	Level 1		Level 2		Level 3		Fair Value
Assets:
Fixed maturities, available for sale
U.S. Treasury obligations	$	—	$	133,627	$	—	$	133,627
U.S. Government-sponsored enterprise obligations	—		20,956		—		20,956
State and municipal bonds	—		632,243		—		632,243
Corporate debt, multiple observable inputs	2,371		1,151,084		—		1,153,455
Corporate debt, limited observable inputs	—		—		13,703		13,703
Residential mortgage-backed securities	—		196,789		1,055		197,844
Agency commercial mortgage-backed securities	—		10,742		—		10,742
Other commercial mortgage-backed securities	—		15,961		—		15,961
Other asset-backed securities	—		97,780		3,931		101,711
Equity investments
Financial	76,051		—		—		76,051
Utilities/Energy	54,388		—		—		54,388
Consumer oriented	54,529		—		—		54,529
Industrial	53,936		—		—		53,936
Bond funds	156,563		—		—		156,563
All other	75,142		—		—		75,142
Short-term investments	404,204		27,922		—		432,126
Other investments	607		31,155		409		32,171
Other assets	—		1,731		—		1,731
Total assets categorized within the fair value hierarchy	$	877,791	$	2,319,990	$	19,098	3,216,879
Assets carried at NAV, which approximates fair value and which are not categorized within the fair value hierarchy, reported as a part of:
Investment in unconsolidated subsidiaries							210,759
Other investments							20,130
Total assets at fair value							$	3,447,768

Summary of quantitative information about Level 3 fair value measurements

Quantitative Information Regarding Level 3 Valuations

	Fair Value at
(In thousands)	March 31, 2018	December 31, 2017	Valuation Technique	Unobservable Input	Range (Weighted Average)
Assets:
Corporate debt, limited observable inputs	$15,097	$13,703	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Residential mortgage-backed and other asset-backed securities	$17,323	$4,986	Market Comparable Securities	Comparability Adjustment	0% - 5% (2.5%)
			Discounted Cash Flows	Comparability Adjustment	0% - 5% (2.5%)
Other investments	$365	$409	Discounted Cash Flows	Comparability Adjustment	0% - 10% (5%)

Summary of changes in the fair value of assets measured at fair value

The following tables (the Level 3 Tables) present summary information regarding changes in the fair value of assets measured at fair value using Level 3 inputs.

	March 31, 2018
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments			Total
Balance December 31, 2017	$	13,703		$	4,986		$	409		$	19,098
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(38		)	—			—			(38		)
Net realized investment gains (losses)	—			—			(44		)	(44		)
Included in other comprehensive income	(38		)	(30		)	—			(68		)
Purchases	6,005			13,453			—			19,458
Sales	(2,905		)	(27		)	—			(2,932		)
Transfers in	2,069			—			—			2,069
Transfers out	(3,699		)	(1,059		)	—			(4,758		)
Balance March 31, 2018	$	15,097		$	17,323		$	365		$	32,785
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—		$	—

	March 31, 2017
	Level 3 Fair Value Measurements – Assets
(In thousands)	Corporate Debt			Asset-backed Securities			Other investments		Total
Balance December 31, 2016	$	14,810		$	3,007		$	3	$	17,820
Total gains (losses) realized and unrealized:
Included in earnings, as a part of:
Net investment income	(39		)	—			—		(39		)
Net realized investment gains (losses)	13			—			—		13
Included in other comprehensive income	(208		)	(5		)	2		(211		)
Purchases	7,048			—			—		7,048
Sales	(1,712		)	—			—		(1,712		)
Transfers in	—			—			898		898
Transfers out	(998		)	—			—		(998		)
Balance March 31, 2017	$	18,914		$	3,002		$	903	$	22,819
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	$	—		$	—		$	—	$	—

Investments in Limited liability companies and limited partnerships

At March 31, 2018 and December 31, 2017, certain LPs/LLCs and investment funds measure fund assets at fair value on a recurring basis and provide a NAV for ProAssurance's interest. The carrying value of these interests is based on the NAV provided and was considered to approximate the fair value of the interests. For investment in unconsolidated subsidiaries, ProAssurance recognizes any changes in the NAV of its interests in equity in earnings (loss) of unconsolidated subsidiaries during the period of change. In accordance with GAAP, the fair value of these investments was not classified within the fair value hierarchy. The amount of ProAssurance's unfunded commitments related to these investments as of March 31, 2018 and fair values of these investments as of March 31, 2018 and December 31, 2017 was as follows:

	Unfunded Commitments	Fair Value
(In thousands)	March 31, 2018	March 31, 2018		December 31, 2017
Equity investments:
Mortgage fund (1)*	None	$	20,215	$	—
Investment in unconsolidated subsidiaries:
Private debt funds (2)	$4,976	32,064		42,206
Long equity fund (3)	None	7,957		7,847
Long/short equity funds (4)	None	32,177		31,352
Non-public equity funds (5)	$82,135	105,049		100,062
Multi-strategy fund of funds (6)	None	9,274		9,100
Credit funds (7)	None	17,789		6,561
Long/short commodities fund (8)	None	13,063		13,025
Strategy focused funds (9)	$19,241	59,721		606
		277,094		210,759
Other investments:
Mortgage fund (1)*	See above	—		20,130
Total investments carried at NAV		$	297,309	$	230,889
* In the first quarter of 2018, ProAssurance began presenting this investment previously reported as a part of other investments as a part of equity investments on the Condensed Consolidated Balance Sheet as of March 31, 2018. Prior year amounts have not been reclassified.

Below is additional information regarding each of the investments listed in the table above as of March 31, 2018.

⁽¹⁾  This investment fund is focused on the structured mortgage market. The fund will primarily invest in U.S. Agency mortgage-backed securities. Redemptions are allowed at the end of any calendar quarter with a prior notice requirement of 65 days and are paid within 45 days at the end of the redemption dealing day.

⁽²⁾  The investment is comprised of interests in two unrelated LP funds that are structured to provide interest distributions primarily through diversified portfolios of private debt instruments. One LP allows redemption by special consent; the other does not permit redemption. Income and capital are to be periodically distributed at the discretion of the LPs over an anticipated time frame that spans from three to eight years.

⁽³⁾  The fund is a LP that holds long equities of public international companies. Redemptions are allowed at the end of any calendar month with a prior notice requirement of 15 days and are paid within 10 days of the end of the calendar month of the redemption request.

⁽⁴⁾  The investment is comprised of interests in multiple unrelated LP funds. The funds hold primarily long and short North American equities and target absolute returns using strategies designed to take advantage of market opportunities. The funds generally permit quarterly or semi-annual capital redemptions subject to notice requirements of 30 to 90 days. For some funds, redemptions above specified thresholds (lowest threshold is 90%) may be only partially payable until after a fund audit is completed and are then payable within 30 days.

⁽⁵⁾  The investment is comprised of interests in multiple unrelated LP funds, each structured to provide capital appreciation through diversified investments in private equity, which can include investments in buyout, venture capital, debt including senior, second lien and mezzanine, distressed debt and other private equity-oriented LPs. Two of the LPs allow redemption by terms set forth in the LP agreements; the others do not permit redemption. Income and capital are to be periodically distributed at the discretion of the LP over time frames that are anticipated to span up to nine years.

⁽⁶⁾  This fund is a LLC structured to build and manage low volatility, multi-manager portfolios that have little or no correlation to the broader fixed income and equity security markets. Redemptions are not permitted but offers to repurchase units of the LLC may be extended periodically.

⁽⁷⁾  The investment is comprised of two unrelated LP funds. One fund seeks to obtain superior risk-adjusted absolute returns through a diversified portfolio of debt securities, including bonds, loans and other asset-backed instruments. The second fund seeks event driven opportunities across the corporate credit spectrum. For both funds, redemptions are allowed at any quarter-end with a prior notice requirement of 90 days.

⁽⁸⁾  This fund is a LLC invested across a broad range of commodities and focuses primarily on market neutral, relative value strategies, seeking to generate absolute returns with low correlation to broad commodity, equity and fixed income markets. Following an initial one-year lock-up period, redemptions are allowed with a prior notice requirement of 30 days and are payable within 30 days.

⁽⁹⁾ The investment is comprised of multiple unrelated LP funds. One fund is a LLC focused on investing in North American consumer products companies, comprised of equity and equity-related securities, as well as debt instruments. Redemptions are not permitted. Another fund is a LP focused on North American energy infrastructure assets that allows redemption with consent of the General Partner. The remaining funds are real estate focused LPs, one of which allows for redemption with prior notice.

Financial instruments not measured at fair value

The following table provides the estimated fair value of our financial instruments that, in accordance with GAAP for the type of investment, are measured using a methodology other than fair value. All fair values provided primarily fall within the Level 3 fair value category.

	March 31, 2018				December 31, 2017
(In thousands)	Carrying Value		Fair Value		Carrying Value		Fair Value
Financial assets:
BOLI	$	62,562	$	62,562	$	62,113	$	62,113
Other investments	$	2,902	$	2,902	$	58,546	$	69,095
Other assets	$	49,549	$	48,816	$	34,020	$	33,742
Financial liabilities:
Senior notes due 2023*	$	250,000	$	269,418	$	250,000	$	273,153
Revolving Credit Agreement*	$	83,000	$	83,000	$	123,000	$	123,000
Mortgage loans*	$	40,111	$	40,111	$	40,460	$	40,460
Other liabilities	$	21,525	$	21,525	$	21,154	$	21,154
* Carrying value excludes debt issuance costs.

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Investments (Tables)

3 Months Ended

Mar. 31, 2018

Investments, Debt and Equity Securities [Abstract]

Amortized cost and estimated fair value of available-for-sale fixed maturities and equity securities

Available-for-sale fixed maturities at March 31, 2018 and December 31, 2017 included the following:

	March 31, 2018
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	305	$	2,209	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		27		445		29,959
State and municipal bonds	324,336		6,613		954		329,995
Corporate debt	1,259,132		7,008		17,877		1,248,263
Residential mortgage-backed securities	217,891		1,502		3,973		215,420
Agency commercial mortgage-backed securities	15,078		29		220		14,887
Other commercial mortgage-backed securities	29,409		100		314		29,195
Other asset-backed securities	157,506		40		1,333		156,213
	$	2,165,384	$	15,624	$	27,325	$	2,153,683
	December 31, 2017
(In thousands)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses		Estimated Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	134,323	$	485	$	1,181	$	133,627
U.S. Government-sponsored enterprise obligations	21,089		73		206		20,956
State and municipal bonds	618,414		14,248		419		632,243
Corporate debt	1,157,660		15,205		5,707		1,167,158
Residential mortgage-backed securities	196,741		2,438		1,335		197,844
Agency commercial mortgage-backed securities	10,827		23		108		10,742
Other commercial mortgage-backed securities	16,004		91		134		15,961
Other asset-backed securities	102,130		47		466		101,711
	$	2,257,188	$	32,610	$	9,556	$	2,280,242

Schedule of available for sale securities by contractual maturity

The recorded cost basis and estimated fair value of available-for-sale fixed maturities at March 31, 2018, by contractual maturity, are shown below. Actual maturities may differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.

(In thousands)	Amortized Cost		Due in one year or less		Due after one year through five years		Due after five years through ten years		Due after ten years		Total Fair Value
Fixed maturities, available for sale
U.S. Treasury obligations	$	131,655	$	31,700	$	73,858	$	21,321	$	2,872	$	129,751
U.S. Government-sponsored enterprise obligations	30,377		—		8,009		21,814		136		29,959
State and municipal bonds	324,336		29,481		111,512		140,004		48,998		329,995
Corporate debt	1,259,132		115,385		682,646		404,159		46,073		1,248,263
Residential mortgage-backed securities	217,891										215,420
Agency commercial mortgage-backed securities	15,078										14,887
Other commercial mortgage-backed securities	29,409										29,195
Other asset-backed securities	157,506										156,213
	$	2,165,384									$	2,153,683

Investments held in an unrealized loss position

The following tables provide summarized information with respect to investments held in an unrealized loss position at March 31, 2018 and December 31, 2017, including the length of time the investment had been held in a continuous unrealized loss position.

	March 31, 2018
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	121,718	$	2,209	$	87,740	$	1,438	$	33,978	$	771
U.S. Government-sponsored enterprise obligations	29,018		445		22,252		218		6,766		227
State and municipal bonds	63,690		954		55,761		620		7,929		334
Corporate debt	848,499		17,877		733,344		13,216		115,155		4,661
Residential mortgage-backed securities	175,295		3,973		132,075		2,066		43,220		1,907
Agency commercial mortgage-backed securities	9,547		220		7,638		101		1,909		119
Other commercial mortgage-backed securities	19,145		314		15,723		256		3,422		58
Other asset-backed securities	118,780		1,333		105,370		1,134		13,410		199
	$	1,385,692	$	27,325	$	1,159,903	$	19,049	$	225,789	$	8,276

	December 31, 2017
	Total				Less than 12 months				12 months or longer
	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
(In thousands)	Value		Loss		Value		Loss		Value		Loss
Fixed maturities, available for sale
U.S. Treasury obligations	$	110,788	$	1,181	$	67,135	$	554	$	43,653	$	627
U.S. Government-sponsored enterprise obligations	17,032		206		10,182		64		6,850		142
State and municipal bonds	23,122		419		15,168		102		7,954		317
Corporate debt	487,578		5,707		365,541		2,730		122,037		2,977
Residential mortgage-backed securities	109,659		1,335		64,121		402		45,538		933
Agency commercial mortgage-backed securities	4,423		108		2,458		34		1,965		74
Other commercial mortgage-backed securities	12,878		134		7,939		82		4,939		52
Other asset-backed securities	85,358		466		70,924		346		14,434		120
	$	850,838	$	9,556	$	603,468	$	4,314	$	247,370	$	5,242

Information regarding sales and purchases of available-for-sale securities

Other information regarding sales and purchases of fixed maturity available-for-sale securities is as follows:

	Three Months Ended March 31
(In millions)	2018		2017
Proceeds from sales (exclusive of maturities and paydowns)	$	379.2	$	79.2
Purchases	$	367.9	$	160.4

Net Investment Income

Net investment income by investment category was as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Fixed maturities	$	17,080		$	20,121
Equities	4,867			3,644
Short-term investments, including Other	1,308			801
BOLI	449			455
Investment fees and expenses	(1,677		)	(1,835		)
Net investment income	$	22,027		$	23,186

Investments in unconsolidated subsidiaries

ProAssurance's investment in unconsolidated subsidiaries were as follows:

	March 31, 2018	Carrying Value
(In thousands)	Percentage Ownership	March 31, 2018		December 31, 2017
Qualified affordable housing project tax credit partnerships	See below	$	80,507	$	84,607
Other tax credit partnerships	See below	5,735		6,118
All other investments, primarily investment fund LPs/LLCs	See below	314,788		239,866
		$	401,030	$	330,591

Net realized investment gains (losses)

Realized investment gains and losses are recognized on the first-in, first-out basis. The following table provides detailed information regarding net realized investment gains (losses):

	Three Months Ended March 31
(In thousands)	2018			2017
Total OTTI losses:
Corporate debt	$	—		$	(419	)
Portion of OTTI losses recognized in other comprehensive income before taxes:
Corporate debt	—			248
Net impairment losses recognized in earnings	—			(171		)
Gross realized gains, available-for-sale fixed maturities	4,464			1,853
Gross realized (losses), available-for-sale fixed maturities	(2,047		)	(67		)
Net realized gains (losses), equity investments	9,219			6,562
Net realized gains (losses), other investments	688			1,172
Change in unrealized holding gains (losses), trading fixed maturities	(49		)	—
Change in unrealized holding gains (losses), equity investments	(23,845		)	3,616
Change in unrealized holding gains (losses), convertible securities, carried at fair value	(954		)	313
Other	7			2
Net realized investment gains (losses)	$	(12,517	)	$	13,280

Other than temporary impairment, credit losses recognized in earnings

The following table presents a roll forward of cumulative credit losses recorded in earnings related to impaired debt securities for which a portion of the OTTI was recorded in OCI.

	Three Months Ended March 31
(In thousands)	2018		2017
Balance beginning of period	$	1,313	$	1,158
Additional credit losses recognized during the period, related to securities for which:
No OTTI has been previously recognized	—		171
Balance March 31	$	1,313	$	1,329

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Reserve for Losses and Loss Adjustment Expenses (Tables)

3 Months Ended

Mar. 31, 2018

Insurance [Abstract]

Summary of reserve for losses and loss adjustment expenses

Activity in the reserve for losses and loss adjustment expenses is summarized as follows:

(In thousands)	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017			Year Ended December 31, 2017
Balance, beginning of year	$	2,048,381		$	1,993,428		$	1,993,428
Less reinsurance recoverables on unpaid losses and loss adjustment expenses	335,585			273,475			273,475
Net balance, beginning of year	1,712,796			1,719,953			1,719,953
Net losses:
Current year	152,572			147,927			603,518
Favorable development of reserves established in prior years, net	(22,786		)	(28,776		)	(134,360		)
Total	129,786			119,151			469,158
Paid related to:
Current year	(14,243		)	(33,085		)	(106,633		)
Prior years	(101,078		)	(80,709		)	(369,682		)
Total paid	(115,321		)	(113,794		)	(476,315		)
Net balance, end of period	1,727,261			1,725,310			1,712,796
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses	329,540			271,679			335,585
Balance, end of period	$	2,056,801		$	1,996,989		$	2,048,381

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Debt (Tables)

3 Months Ended

Mar. 31, 2018

Debt Disclosure [Abstract]

Schedule of Long-term Debt Instruments

ProAssurance’s outstanding debt consisted of the following:

(In thousands)	March 31, 2018		December 31, 2017
Senior Notes due 2023, unsecured, interest at 5.3% annually	$	250,000	$	250,000
Revolving Credit Agreement, outstanding borrowings are fully secured, see Note 3, and carried at a weighted average interest rate of 2.24% and 1.91%, respectively. Outstanding borrowings are not permitted to exceed $250 million aggregately; Revolving Credit Agreement expires in 2020. The interest rate on the borrowings is set at the time the respective borrowing is initiated or renewed. The current borrowing can be repaid or renewed in the second quarter of 2018. If renewed, the interest rate will be reset.	83,000		123,000
Mortgage Loans, outstanding borrowings are secured by first priority liens on two office buildings, and bear an interest rate of three-month LIBOR plus 1.325% (3.42% and 2.86%, respectively) determined on a quarterly basis.	40,111		40,460
Total principal	373,111		413,460
Less debt issuance costs	1,583		1,649
Debt less debt issuance costs	$	371,528	$	411,811

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Derivatives (Tables)

3 Months Ended

Mar. 31, 2018

Derivative Instruments and Hedging Activities Disclosure [Abstract]

Schedule of interest rate caps

The following table provides a summary of the volume and fair value position of the interest rate cap as well as the reporting location in the Condensed Consolidated Balance Sheets as of March 31, 2018 and December 31, 2017.

($ in thousands)		March 31, 2018					December 31, 2017
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Balance Sheets	Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)		Number of Instruments	Notional Amount (1)		Estimated Fair Value (2)
Interest Rate Cap	Other assets	1	$	35,000	$	2,306	1	$	35,000	$	1,731
(1) Volume is represented by the derivative instrument's notional amount.
(2) Additional information regarding the fair value of the Company's interest rate cap is provided in Note 2.

The following table presents the pre-tax impact of the change in the fair value of the interest rate cap and the reporting location in the Condensed Consolidated Statements of Income and Comprehensive Income for the three months endedMarch 31, 2018 and 2017.

		Gains (Losses) Recognized in Income on Derivatives
(In thousands)		Three Months Ended March 31
Derivatives Not Designated as Hedging Instruments	Location in the Condensed Consolidated Statements of Income and Comprehensive Income	2018		2017
Interest Rate Cap	Interest expense	$	575	$	—

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Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2018

Equity [Abstract]

Schedule of Share-based compensation expense and related tax benefits

Share-based compensation expense and related tax benefits were as follows:

	Three Months Ended March 31
(In thousands)	2018		2017
Share-based compensation expense	$	902	$	3,346
Related tax benefits	$	190	$	1,171

Reclassification adjustments related to available-for-sale securities

Amounts reclassified from AOCI to net income and the amounts of deferred tax expense (benefit) included in OCI were as follows:

	Three Months Ended March 31
(In thousands)	2018			2017
Reclassifications from AOCI to net income:
Realized investment gains (losses)	$	2,417		$	1,616
Tax effect*	(508		)	(566		)
Net reclassification adjustments	$	1,909		$	1,050
Deferred tax expense (benefit) included in OCI	$	(7,060	)	$	1,481
* Tax effects were computed using a 21% and 35% rate for the three months ended March 31, 2018 and 2017, respectively.

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2018

Earnings Per Share [Abstract]

Schedule of Earnings Per Share, Basic and Diluted

The following table provides the weighted average number of common shares outstanding used in the calculation of the Company's basic and diluted earnings per share:

(In thousands, except per share data)	Three Months Ended March 31
	2018		2017
Weighted average number of common shares outstanding, basic	53,515		53,315
Dilutive effect of securities:
Restricted Share Units	82		78
Performance Share Units	66		121
Purchase Match Units	19		21
Weighted average number of common shares outstanding, diluted	53,682		53,535
Effect of dilutive shares on earnings per share	$	—	$	(0.01	)

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Segment Information (Tables)

3 Months Ended

Mar. 31, 2018

Segment Reporting [Abstract]

Schedule of Segment Reporting Information, by Segment

Financial results by segment were as follows:

	Three Months Ended March 31, 2018
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	116,276		$	58,407		$	12,476		$	—		$	—		$	187,159
Net investment income	—			—			751			21,276			—			22,027
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,640			—			1,640
Net realized gains (losses)	—			—			(54		)	(12,463		)	—			(12,517		)
Other income (expense)	1,256			366			331			943			(173		)	2,723
Net losses and loss adjustment expenses	(84,585		)	(36,715		)	(8,486		)	—			—			(129,786		)
Underwriting, policy acquisition and operating expenses	(28,276		)	(17,333		)	(7,246		)	(4,678		)	173			(57,360		)
Segregated portfolio cells dividend (expense) income	30			(1,894		)	—			117			—			(1,747		)
Interest expense	—			—			—			(3,705		)	—			(3,705		)
Income tax benefit (expense)	—			—			(6		)	3,428			—			3,422
Segment operating results	$	4,701		$	2,831		$	(2,234	)	$	6,558		$	—		$	11,856
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,867		$	956		$	(1	)	$	3,257		$	—		$	6,079

	Three Months Ended March 31, 2017
(In thousands)	Specialty P&C			Workers' Compensation			Lloyd's Syndicate			Corporate			Inter-segment Eliminations			Consolidated
Net premiums earned	$	113,058		$	55,283		$	14,562		$	—		$	—		$	182,903
Net investment income	—			—			372			22,814			—			23,186
Equity in earnings (loss) of unconsolidated subsidiaries	—			—			—			1,808			—			1,808
Net realized gains (losses)	—			—			27			13,253			—			13,280
Other income (expense)	1,198			145			391			173			(86		)	1,821
Net losses and loss adjustment expenses	(74,994		)	(34,650		)	(9,507		)	—			—			(119,151		)
Underwriting, policy acquisition and operating expenses	(25,977		)	(16,691		)	(6,211		)	(8,315		)	86			(57,108		)
Segregated portfolio cells dividend (expense) income	28			(1,174		)	—			(1,229		)	—			(2,375		)
Interest expense	—			—			—			(4,133		)	—			(4,133		)
Income tax benefit (expense)	—			—			7			1,217			—			1,224
Segment operating results	$	13,313		$	2,913		$	(359	)	$	25,588		$	—		$	41,455
Significant non-cash items:
Depreciation and amortization, net of accretion	$	1,911		$	837		$	(3	)	$	5,058		$	—		$	7,803

Schedule of Gross Premiums by Product

The following table provides detailed information regarding ProAssurance's gross premiums earned by product as well as a reconciliation to net premiums earned. All gross premiums earned are from external customers except as noted. ProAssurance's insured risks are primarily within the U.S.

	Three Months Ended March 31
(In thousands)	2018			2017
Specialty P&C Segment
Gross premiums earned:
Healthcare professional liability	$	118,685		$	117,051
Legal professional liability	6,391			6,317
Medical technology liability	8,512			8,312
Other	110			102
Ceded premiums earned	(17,422		)	(18,724		)
Segment net premiums earned	116,276			113,058
Workers' Compensation Segment
Gross premiums earned:
Traditional business	46,030			41,768
Alternative market business	19,381			19,446
Ceded premiums earned	(7,004		)	(5,931		)
Segment net premiums earned	58,407			55,283
Lloyd's Syndicate Segment
Gross premiums earned:
Property and casualty*	17,967			17,185
Ceded premiums earned	(5,491		)	(2,623		)
Segment net premiums earned	12,476			14,562
Consolidated net premiums earned	$	187,159		$	182,903

*Includes premium assumed from the Specialty P&C segment of $1.9 million for the three months endedMarch 31, 2018 and $3.5 million for the same respective period of 2017.

XML

Basis of Presentation (Narrative) (Details) $ in Thousands		3 Months Ended
		Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of reportable segments | segment		4
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Other liabilities		$ 207,866		$ 437,600
Distributed earnings from unconsolidated subsidiaries		7,018	$ 10,893
Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI to retained earnings for stranded tax effects		(3,400)
Accumulated Other Comprehensive Income (Loss)
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification from AOCI to retained earnings for stranded tax effects		$ 3,400
Accounting Standards Update 2016-15
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Distributions from unconsolidated subsidiaries, investing activities			(10,900)
Distributed earnings from unconsolidated subsidiaries			$ 10,900
Accounting Standards Update 2016-01
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment adoption of ASU	[1]			8,334
Accounting Standards Update 2016-01 | Retained Earnings
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Cumulative-effect adjustment adoption of ASU	[1]			$ 8,334

[1] See Note 1 for discussion of accounting guidance adopted during the period.

XML

Basis of Presentation (Other Liabilities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
SPC dividends payable	$ 47,122	$ 46,925
Unpaid dividends	16,616	267,292	$ 16,516
All other	144,128	123,383
Total other liabilities	$ 207,866	$ 437,600

XML

Fair Value Measurement (Assets and Liabilities Measured at Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets:
Fixed maturities, available for sale	$ 2,153,683	$ 2,280,242
Equity investments	492,159	470,609
Fair Value	297,309	230,889
Investment in unconsolidated subsidiaries
Assets:
Fair Value	277,094	210,759
Level 3 | Corporate debt, limited observable inputs
Assets:
Total assets categorized within the fair value hierarchy	15,097	13,703
Level 3 | Other investments
Assets:
Total assets categorized within the fair value hierarchy	365	409
Recurring
Assets:
Other assets	2,306	1,731
Total assets categorized within the fair value hierarchy	3,014,242	3,216,879
Total assets at fair value	3,311,551	3,447,768
Recurring | U.S. Treasury obligations
Assets:
Fixed maturities, available for sale	129,751	133,627
Recurring | U.S. Government-sponsored enterprise obligations
Assets:
Fixed maturities, available for sale	29,959	20,956
Recurring | State and municipal bonds
Assets:
Fixed maturities, available for sale	329,995	632,243
Recurring | Corporate debt, multiple observable inputs
Assets:
Fixed maturities, available for sale	1,233,166	1,153,455
Recurring | Corporate debt, limited observable inputs
Assets:
Fixed maturities, available for sale	15,097	13,703
Recurring | Residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	215,420	197,844
Recurring | Agency commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	14,887	10,742
Recurring | Other commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	29,195	15,961
Recurring | Other asset-backed securities
Assets:
Fixed maturities, available for sale	156,213	101,711
Recurring | Corporate Debt
Assets:
Fixed maturities, available for sale	4,148
Recurring | Financial
Assets:
Equity investments	74,556	76,051
Recurring | Utilities/Energy
Assets:
Equity investments	46,637	54,388
Recurring | Consumer oriented
Assets:
Equity investments	54,789	54,529
Recurring | Industrial
Assets:
Equity investments	48,859	53,936
Recurring | Bond funds
Assets:
Equity investments	153,256	156,563
Recurring | All other
Assets:
Equity investments	93,847	75,142
Recurring | Short-term investments
Assets:
Short-term and other investments	349,119	432,126
Recurring | Other investments
Assets:
Short-term and other investments	33,042	32,171
Fair Value		20,130
Recurring | Investment in unconsolidated subsidiaries
Assets:
Fair Value		210,759
Recurring | Level 1
Assets:
Other assets	0	0
Total assets categorized within the fair value hierarchy	762,901	877,791
Recurring | Level 1 | U.S. Treasury obligations
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | U.S. Government-sponsored enterprise obligations
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | State and municipal bonds
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Corporate debt, multiple observable inputs
Assets:
Fixed maturities, available for sale	2,334	2,371
Recurring | Level 1 | Corporate debt, limited observable inputs
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Agency commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Other commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Other asset-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 1 | Corporate Debt
Assets:
Fixed maturities, available for sale	0
Recurring | Level 1 | Financial
Assets:
Equity investments	74,556	76,051
Recurring | Level 1 | Utilities/Energy
Assets:
Equity investments	46,637	54,388
Recurring | Level 1 | Consumer oriented
Assets:
Equity investments	54,789	54,529
Recurring | Level 1 | Industrial
Assets:
Equity investments	48,859	53,936
Recurring | Level 1 | Bond funds
Assets:
Equity investments	153,256	156,563
Recurring | Level 1 | All other
Assets:
Equity investments	93,847	75,142
Recurring | Level 1 | Short-term investments
Assets:
Short-term and other investments	288,019	404,204
Recurring | Level 1 | Other investments
Assets:
Short-term and other investments	604	607
Recurring | Level 2
Assets:
Other assets	2,306	1,731
Total assets categorized within the fair value hierarchy	2,218,556	2,319,990
Recurring | Level 2 | U.S. Treasury obligations
Assets:
Fixed maturities, available for sale	129,751	133,627
Recurring | Level 2 | U.S. Government-sponsored enterprise obligations
Assets:
Fixed maturities, available for sale	29,959	20,956
Recurring | Level 2 | State and municipal bonds
Assets:
Fixed maturities, available for sale	329,995	632,243
Recurring | Level 2 | Corporate debt, multiple observable inputs
Assets:
Fixed maturities, available for sale	1,230,832	1,151,084
Recurring | Level 2 | Corporate debt, limited observable inputs
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 2 | Residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	215,420	196,789
Recurring | Level 2 | Agency commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	14,887	10,742
Recurring | Level 2 | Other commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	29,195	15,961
Recurring | Level 2 | Other asset-backed securities
Assets:
Fixed maturities, available for sale	138,890	97,780
Recurring | Level 2 | Corporate Debt
Assets:
Fixed maturities, available for sale	4,148
Recurring | Level 2 | Financial
Assets:
Equity investments	0	0
Recurring | Level 2 | Utilities/Energy
Assets:
Equity investments	0	0
Recurring | Level 2 | Consumer oriented
Assets:
Equity investments	0	0
Recurring | Level 2 | Industrial
Assets:
Equity investments	0	0
Recurring | Level 2 | Bond funds
Assets:
Equity investments	0	0
Recurring | Level 2 | All other
Assets:
Equity investments	0	0
Recurring | Level 2 | Short-term investments
Assets:
Short-term and other investments	61,100	27,922
Recurring | Level 2 | Other investments
Assets:
Short-term and other investments	32,073	31,155
Recurring | Level 3
Assets:
Other assets	0	0
Total assets categorized within the fair value hierarchy	32,785	19,098
Recurring | Level 3 | U.S. Treasury obligations
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | U.S. Government-sponsored enterprise obligations
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | State and municipal bonds
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | Corporate debt, multiple observable inputs
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | Corporate debt, limited observable inputs
Assets:
Fixed maturities, available for sale	15,097	13,703
Recurring | Level 3 | Residential mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	1,055
Recurring | Level 3 | Agency commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | Other commercial mortgage-backed securities
Assets:
Fixed maturities, available for sale	0	0
Recurring | Level 3 | Other asset-backed securities
Assets:
Fixed maturities, available for sale	17,323	3,931
Recurring | Level 3 | Corporate Debt
Assets:
Fixed maturities, available for sale	0
Recurring | Level 3 | Financial
Assets:
Equity investments	0	0
Recurring | Level 3 | Utilities/Energy
Assets:
Equity investments	0	0
Recurring | Level 3 | Consumer oriented
Assets:
Equity investments	0	0
Recurring | Level 3 | Industrial
Assets:
Equity investments	0	0
Recurring | Level 3 | Bond funds
Assets:
Equity investments	0	0
Recurring | Level 3 | All other
Assets:
Equity investments	0	0
Recurring | Level 3 | Short-term investments
Assets:
Short-term and other investments	0	0
Recurring | Level 3 | Other investments
Assets:
Short-term and other investments	365	409
Mortgage fund | Other investments
Assets:
Fair Value	0	20,130
Mortgage fund | Equities
Assets:
Fair Value	$ 20,215	$ 0

XML

Fair Value Measurement (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) Agreement	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Credit Derivatives [Line Items]
Transfer of equity securities from Level 2 to Level 1		$ 35,400
Net impairment losses recognized in earnings	$ 0	$ 171
Fair value of funded deferred compensation assets	$ 21,600		$ 20,200
Number of line of credit agreement | Agreement	2
Assets, Fair Value Disclosure, Nonrecurring			$ 1,200
Corporate debt, limited observable inputs | NRSRO | NRSRO, Rating BBB
Credit Derivatives [Line Items]
Credit rating	87.00%
Corporate debt, limited observable inputs | NRSRO | NRSRO, Rating BBBplus
Credit Derivatives [Line Items]
Credit rating			84.00%
Residential mortgage-backed and other asset-backed securities | NRSRO | NRSRO, Rating AAA
Credit Derivatives [Line Items]
Credit rating	78.00%		21.00%
Equities
Credit Derivatives [Line Items]
Transfer of equity securities from Level 2 to Level 1	$ 0
Early Stage Business Development | Investment in unconsolidated subsidiaries
Credit Derivatives [Line Items]
Net impairment losses recognized in earnings			$ 8,500

XML

Fair Value Measurement (Quantitative Information Regarding Level 3 Valuations) (Details) - Level 3 - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Corporate debt, limited observable inputs
Assets:
Fair Value at	$ 15,097	$ 13,703
Corporate debt, limited observable inputs | Market Comparable Securities | Minimum
Assets:
Comparability Adjustment	0.00%
Corporate debt, limited observable inputs | Market Comparable Securities | Maximum
Assets:
Comparability Adjustment	5.00%
Corporate debt, limited observable inputs | Market Comparable Securities | Weighted Average
Assets:
Comparability Adjustment	2.50%
Corporate debt, limited observable inputs | Discounted Cash Flows | Minimum
Assets:
Comparability Adjustment	0.00%
Corporate debt, limited observable inputs | Discounted Cash Flows | Maximum
Assets:
Comparability Adjustment	5.00%
Corporate debt, limited observable inputs | Discounted Cash Flows | Weighted Average
Assets:
Comparability Adjustment	2.50%
Residential mortgage-backed and other asset-backed securities
Assets:
Fair Value at	$ 17,323	4,986
Residential mortgage-backed and other asset-backed securities | Market Comparable Securities | Minimum
Assets:
Comparability Adjustment	0.00%
Residential mortgage-backed and other asset-backed securities | Market Comparable Securities | Maximum
Assets:
Comparability Adjustment	5.00%
Residential mortgage-backed and other asset-backed securities | Market Comparable Securities | Weighted Average
Assets:
Comparability Adjustment	2.50%
Residential mortgage-backed and other asset-backed securities | Discounted Cash Flows | Minimum
Assets:
Comparability Adjustment	0.00%
Residential mortgage-backed and other asset-backed securities | Discounted Cash Flows | Maximum
Assets:
Comparability Adjustment	5.00%
Residential mortgage-backed and other asset-backed securities | Discounted Cash Flows | Weighted Average
Assets:
Comparability Adjustment	2.50%
Other investments
Assets:
Fair Value at	$ 365	$ 409
Other investments | Discounted Cash Flows | Minimum
Assets:
Comparability Adjustment	0.00%
Other investments | Discounted Cash Flows | Maximum
Assets:
Comparability Adjustment	10.00%
Other investments | Discounted Cash Flows | Weighted Average
Assets:
Comparability Adjustment	5.00%

XML

Fair Value Measurement (Level 3 Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:
Beginning Balance	$ 19,098	$ 17,820
Included in earnings, as a part of:
Included in other comprehensive income	(68)	(211)
Purchases	19,458	7,048
Sales	(2,932)	(1,712)
Transfers in	2,069	898
Transfers out	(4,758)	(998)
Ending Balance	32,785	22,819
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	0	0
Net investment income
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	(38)	(39)
Net realized investment gains (losses)
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	(44)	13
Corporate Debt
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:
Beginning Balance	13,703	14,810
Included in earnings, as a part of:
Included in other comprehensive income	(38)	(208)
Purchases	6,005	7,048
Sales	(2,905)	(1,712)
Transfers in	2,069	0
Transfers out	(3,699)	(998)
Ending Balance	15,097	18,914
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	0	0
Corporate Debt | Net investment income
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	(38)	(39)
Corporate Debt | Net realized investment gains (losses)
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	0	13
Asset-backed Securities
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:
Beginning Balance	4,986	3,007
Included in earnings, as a part of:
Included in other comprehensive income	(30)	(5)
Purchases	13,453	0
Sales	(27)	0
Transfers in	0	0
Transfers out	(1,059)	0
Ending Balance	17,323	3,002
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	0	0
Asset-backed Securities | Net investment income
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	0	0
Asset-backed Securities | Net realized investment gains (losses)
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	0	0
Other investments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation:
Beginning Balance	409	3
Included in earnings, as a part of:
Included in other comprehensive income	0	2
Purchases	0	0
Sales	0	0
Transfers in	0	898
Transfers out	0	0
Ending Balance	365	903
Change in unrealized gains (losses) included in earnings for the above period for Level 3 assets held at period-end	0	0
Other investments | Net investment income
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	0	0
Other investments | Net realized investment gains (losses)
Included in earnings, as a part of:
Total gains (losses) realized and unrealized, included in earnings	$ (44)	$ 0

XML

Fair Value Measurement (Investments in LLCs and Limited Partnerships) (Details) - USD ($)	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 297,309,000	$ 230,889,000
Equities | Mortgage fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	20,215,000	0
Investment in unconsolidated subsidiaries
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	277,094,000	210,759,000
Investment in unconsolidated subsidiaries | Private debt funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	4,976,000
Fair Value	32,064,000	42,206,000
Investment in unconsolidated subsidiaries | Long equity fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	7,957,000	7,847,000
Investment in unconsolidated subsidiaries | Long/short equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	32,177,000	31,352,000
Investment in unconsolidated subsidiaries | Non-public equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	82,135,000
Fair Value	105,049,000	100,062,000
Investment in unconsolidated subsidiaries | Multi-strategy fund of funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	9,274,000	9,100,000
Investment in unconsolidated subsidiaries | Credit fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	17,789,000	6,561,000
Investment in unconsolidated subsidiaries | Long/short commodities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	0
Fair Value	13,063,000	13,025,000
Investment in unconsolidated subsidiaries | Strategy focused fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Unfunded Commitments	19,241,000
Fair Value	59,721,000	606,000
Other investments | Mortgage fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Fair Value	$ 0	$ 20,130,000

XML

Fair Value Measurement (Investments in LLCs and Limited Partnerships Footnote) (Details)	3 Months Ended
	Mar. 31, 2018
Mortgage fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	65 days
Payment period for redemption of LP valued at NAV	45 days
Long equity fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	15 days
Payment period for redemption of LP valued at NAV	10 days
Long/short equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Payment period for redemption of LP valued at NAV	30 days
Redemption percentage of LP at NAV for which initial payment is limited	90.00%
Non-public equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidating investments remaining period	9 years
Credit fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	90 days
Long/short commodities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	30 days
Minimum | Secured debt fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidating investments remaining period	3 years
Minimum | Long/short equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	30 days
Maximum | Secured debt fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Liquidating investments remaining period	8 years
Maximum | Long/short equity funds
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Investment redemption notice period	90 days
Maximum | Long/short commodities fund
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]
Payment period for redemption of LP valued at NAV	30 days

XML

Fair Value Measurement (Methodologies Other Than Fair Value) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Financial assets:
BOLI	$ 62,562	$ 62,113
Other investments	35,944	110,847
Other assets	115,596	101,428
Financial liabilities:
Other liabilities	207,866	437,600
Not Measured At Fair Value | Carrying Value
Financial assets:
BOLI	62,562	62,113
Other investments	2,902	58,546
Other assets	49,549	34,020
Financial liabilities:
Other liabilities	21,525	21,154
Not Measured At Fair Value | Carrying Value | Senior Notes
Financial liabilities:
Debt	250,000	250,000
Not Measured At Fair Value | Carrying Value | Mortgage Loans
Financial liabilities:
Debt	40,111	40,460
Not Measured At Fair Value | Carrying Value | Line of Credit
Financial liabilities:
Debt	83,000	123,000
Not Measured At Fair Value | Level 3 | Fair Value
Financial assets:
BOLI	62,562	62,113
Other investments	2,902	69,095
Other assets	48,816	33,742
Financial liabilities:
Other liabilities	21,525	21,154
Not Measured At Fair Value | Level 3 | Fair Value | Senior Notes
Financial liabilities:
Debt	269,418	273,153
Not Measured At Fair Value | Level 3 | Fair Value | Mortgage Loans
Financial liabilities:
Debt	40,111	40,460
Not Measured At Fair Value | Level 3 | Fair Value | Line of Credit
Financial liabilities:
Debt	$ 83,000	$ 123,000

XML

Investments (Available-For-Sale Securities) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fixed maturities, available for sale
Amortized Cost	$ 2,165,384	$ 2,257,188
Gross Unrealized Gains	15,624	32,610
Gross Unrealized Losses	27,325	9,556
Estimated Fair Value	2,153,683	2,280,242
U.S. Treasury obligations
Fixed maturities, available for sale
Amortized Cost	131,655	134,323
Gross Unrealized Gains	305	485
Gross Unrealized Losses	2,209	1,181
Estimated Fair Value	129,751	133,627
U.S. Government-sponsored enterprise obligations
Fixed maturities, available for sale
Amortized Cost	30,377	21,089
Gross Unrealized Gains	27	73
Gross Unrealized Losses	445	206
Estimated Fair Value	29,959	20,956
State and municipal bonds
Fixed maturities, available for sale
Amortized Cost	324,336	618,414
Gross Unrealized Gains	6,613	14,248
Gross Unrealized Losses	954	419
Estimated Fair Value	329,995	632,243
Corporate debt
Fixed maturities, available for sale
Amortized Cost	1,259,132	1,157,660
Gross Unrealized Gains	7,008	15,205
Gross Unrealized Losses	17,877	5,707
Estimated Fair Value	1,248,263	1,167,158
Residential mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	217,891	196,741
Gross Unrealized Gains	1,502	2,438
Gross Unrealized Losses	3,973	1,335
Estimated Fair Value	215,420	197,844
Agency commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	15,078	10,827
Gross Unrealized Gains	29	23
Gross Unrealized Losses	220	108
Estimated Fair Value	14,887	10,742
Other commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	29,409	16,004
Gross Unrealized Gains	100	91
Gross Unrealized Losses	314	134
Estimated Fair Value	29,195	15,961
Other asset-backed securities
Fixed maturities, available for sale
Amortized Cost	157,506	102,130
Gross Unrealized Gains	40	47
Gross Unrealized Losses	1,333	466
Estimated Fair Value	$ 156,213	$ 101,711

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Investments (Available For Sale Securities by Contractual Maturity) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fixed maturities, available for sale
Amortized Cost	$ 2,165,384	$ 2,257,188
Estimated Fair Value	2,153,683	2,280,242
U.S. Treasury obligations
Fixed maturities, available for sale
Amortized Cost	131,655	134,323
Due in one year or less	31,700
Due after one year through five years	73,858
Due after five years through ten years	21,321
Due after ten years	2,872
Estimated Fair Value	129,751	133,627
U.S. Government-sponsored enterprise obligations
Fixed maturities, available for sale
Amortized Cost	30,377	21,089
Due in one year or less	0
Due after one year through five years	8,009
Due after five years through ten years	21,814
Due after ten years	136
Estimated Fair Value	29,959	20,956
State and municipal bonds
Fixed maturities, available for sale
Amortized Cost	324,336	618,414
Due in one year or less	29,481
Due after one year through five years	111,512
Due after five years through ten years	140,004
Due after ten years	48,998
Estimated Fair Value	329,995	632,243
Corporate debt
Fixed maturities, available for sale
Amortized Cost	1,259,132	1,157,660
Due in one year or less	115,385
Due after one year through five years	682,646
Due after five years through ten years	404,159
Due after ten years	46,073
Estimated Fair Value	1,248,263	1,167,158
Residential mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	217,891	196,741
Estimated Fair Value	215,420	197,844
Agency commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	15,078	10,827
Estimated Fair Value	14,887	10,742
Other commercial mortgage-backed securities
Fixed maturities, available for sale
Amortized Cost	29,409	16,004
Estimated Fair Value	29,195	15,961
Other asset-backed securities
Fixed maturities, available for sale
Amortized Cost	157,506	102,130
Estimated Fair Value	$ 156,213	$ 101,711

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Investments (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) Security Business investment_interest Issuer	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($) Security Issuer	Dec. 31, 2016 USD ($)
Schedule of Available-for-sale Securities [Line Items]
Number of investment affiliates exceeding shareholder's equity ten percent threshold limit | investment_interest	0
Threshold limit of investments based on shareholders' equity (percent)	10.00%
Securities on deposit with state insurance departments	$ 45,800
Business owned life insurance cost	33,000
Fair Value	$ 297,309		$ 230,889
Number of LPs / LLCs with investment ownership percent over 25% | Business	3
Investment in unconsolidated subsidiaries	$ 401,030		330,591
Equity in earnings, losses from affordable housing projects	(4,100)	$ (3,300)
Affordable housing tax credits	4,600	4,600
Losses from historic tax credit investments	(1,900)	(400)
Tax credits recognized related to historic tax credit investments	700	1,800
Net impairment losses recognized in earnings	0	171
Portion of noncredit OTTI losses recognized in OCI	0	248
Credit-related other-than-temporary impairment recognized in earnings	$ 1,313	$ 1,329	1,313	$ 1,158
Tax Credit Partnerships Almost 100% Ownership
Schedule of Available-for-sale Securities [Line Items]
Number of tax credit partnerships almost 100% ownership percentage | investment_interest	2
Investment in unconsolidated subsidiaries	$ 30,700		32,500
Tax Credit Partnerships Less Than 20% Ownership
Schedule of Available-for-sale Securities [Line Items]
Investment in unconsolidated subsidiaries	49,800		52,100
Other Limited Partnerships and Limited Liability Company, Greater Than 25% Ownership
Schedule of Available-for-sale Securities [Line Items]
Investment in unconsolidated subsidiaries	31,300		30,800
Other Limited Partnerships and Limited Liability Company Less than 25% Ownership
Schedule of Available-for-sale Securities [Line Items]
Investment in unconsolidated subsidiaries	$ 283,500		$ 209,100
Maximum | Tax Credit Partnerships Almost 100% Ownership
Schedule of Available-for-sale Securities [Line Items]
Investment ownership percentage	100.00%
Maximum | Tax Credit Partnerships Less Than 20% Ownership
Schedule of Available-for-sale Securities [Line Items]
Investment ownership percentage	20.00%
Fixed maturities
Schedule of Available-for-sale Securities [Line Items]
Required FAL Deposit	$ 123,500
Short-term investments
Schedule of Available-for-sale Securities [Line Items]
Required FAL Deposit	$ 400
Non Government-Backed
Schedule of Available-for-sale Securities [Line Items]
Number of debt securities in unrealized loss position | Security	943		629
Debt securities in unrealized loss position as percentage of total debt securities held	44.90%		26.50%
Number of issuers in unrealized loss position | Issuer	494		375
Single greatest unrealized loss position	$ 500		$ 400
Second greatest unrealized loss position	400		$ 300
Revolving Credit Agreement
Schedule of Available-for-sale Securities [Line Items]
Securities pledged as collateral	$ 120,100

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Investments (Investments Held in a Loss Position) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Fair Value
Fair Value	$ 1,385,692	$ 850,838
Less than 12 months, Fair Value	1,159,903	603,468
More than 12 months, Fair Value	225,789	247,370
Unrealized Loss
Unrealized Loss	27,325	9,556
Less than 12 months, Unrealized Loss	19,049	4,314
More than 12 months, Unrealized Loss	8,276	5,242
U.S. Treasury obligations
Fair Value
Fair Value	121,718	110,788
Less than 12 months, Fair Value	87,740	67,135
More than 12 months, Fair Value	33,978	43,653
Unrealized Loss
Unrealized Loss	2,209	1,181
Less than 12 months, Unrealized Loss	1,438	554
More than 12 months, Unrealized Loss	771	627
U.S. Government-sponsored enterprise obligations
Fair Value
Fair Value	29,018	17,032
Less than 12 months, Fair Value	22,252	10,182
More than 12 months, Fair Value	6,766	6,850
Unrealized Loss
Unrealized Loss	445	206
Less than 12 months, Unrealized Loss	218	64
More than 12 months, Unrealized Loss	227	142
State and municipal bonds
Fair Value
Fair Value	63,690	23,122
Less than 12 months, Fair Value	55,761	15,168
More than 12 months, Fair Value	7,929	7,954
Unrealized Loss
Unrealized Loss	954	419
Less than 12 months, Unrealized Loss	620	102
More than 12 months, Unrealized Loss	334	317
Corporate debt
Fair Value
Fair Value	848,499	487,578
Less than 12 months, Fair Value	733,344	365,541
More than 12 months, Fair Value	115,155	122,037
Unrealized Loss
Unrealized Loss	17,877	5,707
Less than 12 months, Unrealized Loss	13,216	2,730
More than 12 months, Unrealized Loss	4,661	2,977
Residential mortgage-backed securities
Fair Value
Fair Value	175,295	109,659
Less than 12 months, Fair Value	132,075	64,121
More than 12 months, Fair Value	43,220	45,538
Unrealized Loss
Unrealized Loss	3,973	1,335
Less than 12 months, Unrealized Loss	2,066	402
More than 12 months, Unrealized Loss	1,907	933
Agency commercial mortgage-backed securities
Fair Value
Fair Value	9,547	4,423
Less than 12 months, Fair Value	7,638	2,458
More than 12 months, Fair Value	1,909	1,965
Unrealized Loss
Unrealized Loss	220	108
Less than 12 months, Unrealized Loss	101	34
More than 12 months, Unrealized Loss	119	74
Other commercial mortgage-backed securities
Fair Value
Fair Value	19,145	12,878
Less than 12 months, Fair Value	15,723	7,939
More than 12 months, Fair Value	3,422	4,939
Unrealized Loss
Unrealized Loss	314	134
Less than 12 months, Unrealized Loss	256	82
More than 12 months, Unrealized Loss	58	52
Other asset-backed securities
Fair Value
Fair Value	118,780	85,358
Less than 12 months, Fair Value	105,370	70,924
More than 12 months, Fair Value	13,410	14,434
Unrealized Loss
Unrealized Loss	1,333	466
Less than 12 months, Unrealized Loss	1,134	346
More than 12 months, Unrealized Loss	$ 199	$ 120

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Investments (Sales and Purchases of Available-for-Sale Securities) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Information regarding sales and purchases of available-for-sale securities
Proceeds from sales (exclusive of maturities and paydowns)	$ 379,200	$ 79,200
Purchases	$ 367,872	$ 160,364

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Investments (Net Investment Income) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Net Investment Income
Investment fees and expenses	$ (1,677)	$ (1,835)
Net investment income	22,027	23,186
Fixed maturities
Net Investment Income
Investment Income	17,080	20,121
Equities
Net Investment Income
Investment Income	4,867	3,644
Short-term investments, including Other
Net Investment Income
Investment Income	1,308	801
BOLI
Net Investment Income
Investment Income	$ 449	$ 455

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Investments (Unconsolidated Subsidiaries) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	$ 401,030	$ 330,591
Qualified affordable housing project tax credit partnerships
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	80,507	84,607
Other tax credit partnerships
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	5,735	6,118
All other investments, primarily investment fund LPs/LLCs
Unconsolidated Subsidiaries
Investment in unconsolidated subsidiaries	$ 314,788	$ 239,866

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Investments (Net Realized Investment Gains (Losses)) (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Investments, Debt and Equity Securities [Abstract]
OTTI losses	$ 0	$ (419,000)
Portion of OTTI losses recognized in other comprehensive income before taxes	0	248,000
Net impairment losses recognized in earnings	0	(171,000)
Gross realized gains, available-for-sale fixed maturities	4,464,000	1,853,000
Gross realized (losses), available-for-sale fixed maturities	(2,047,000)	(67,000)
Net realized gains (losses), equity investments	9,219,000	6,562,000
Net realized gains (losses), other investments	688,000	1,172,000
Change in unrealized holding gains (losses), trading fixed maturities	(49,000)	0
Change in unrealized holding gains (losses), equity investments	(23,845,000)	3,616,000
Change in unrealized holding gains (losses), convertible securities, carried at fair value	(954,000)	313,000
Other	7,000	2,000
Total net realized investment gains (losses)	$ (12,517,000)	$ 13,280,000

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Investments (Credit Losses Recorded in Earnings) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Other than Temporary Impairment, Credit Losses Recognized in Earnings:
Balance beginning of period	$ 1,313	$ 1,158
Additional credit losses recognized during the period, related to securities for which:
No OTTI has been previously recognized	0	171
Accumulated credit losses related to impaired debt securities, Ending Balance	$ 1,313	$ 1,329

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Income Taxes (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Income Tax Disclosure [Abstract]
Income taxes liabilities	$ 6.3	$ 8.0
Unrecognized tax benefits	5.2	5.8
Accrued liability for interest related to unrecognized tax benefits	$ 0.6	$ 0.5

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Reserve for Losses and Loss Adjustment Expenses (Details) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018 USD ($) partition	Mar. 31, 2017 USD ($)	Dec. 31, 2017 USD ($)
Liability for Unpaid Claims and Claims Adjustment Expense, Period Increase (Decrease) [Abstract]
Minimum period for claims resolution (years)	5 years
Number of business partitions | partition	200
Summary of reserve for losses and loss adjustment expenses
Balance, beginning of year	$ 2,048,381	$ 1,993,428	$ 1,993,428
Less reinsurance recoverables on unpaid losses and loss adjustment expenses	335,585	273,475	273,475
Net balance, beginning of year	1,712,796	1,719,953	1,719,953
Net losses:
Current year	152,572	147,927	603,518
Favorable development of reserves established in prior years, net	(22,786)	(28,776)	(134,360)
Total	129,786	119,151	469,158
Paid related to:
Current year	(14,243)	(33,085)	(106,633)
Prior years	(101,078)	(80,709)	(369,682)
Total paid	(115,321)	(113,794)	(476,315)
Net balance, end of period	1,727,261	1,725,310	1,712,796
Plus reinsurance recoverables on unpaid losses and loss adjustment expenses	329,540	271,679	335,585
Balance, end of period	$ 2,056,801	$ 1,996,989	$ 2,048,381

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Commitments and Contingencies (Details) - Lloyd's Syndicate $ in Millions	Mar. 31, 2018 USD ($)	Mar. 31, 2018 GBP (£)	Feb. 28, 2018 GBP (£)	Jan. 31, 2018 GBP (£)
Other Commitments [Line Items]
Required FAL Deposit	$ 123.9
Current lending capacity under revolving credit agreement | £			£ 30,000,000	£ 20,000,000
Interest rate on revolving credit agreement	3.80%	3.80%
Unused commitments to extend credit	$ 4.6	£ 3,300,000
Commitment to Provide Capital
Other Commitments [Line Items]
Commitments Total	$ 200.0

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Debt (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Gross debt	$ 373,111,000	$ 413,460,000
Less debt issuance costs	1,583,000	1,649,000
Debt less debt issuance costs	371,528,000	411,811,000
Senior Notes | Senior notes due 2023
Debt Instrument [Line Items]
Gross debt	$ 250,000,000	$ 250,000,000
Stated interest rate on debt	5.30%	5.30%
Line of Credit | Revolving Credit Agreement
Debt Instrument [Line Items]
Gross debt	$ 83,000,000	$ 123,000,000
Weighted average interest rate on debt	2.24%	1.91%
Line of credit maximum borrowing capacity	$ 250,000,000	$ 250,000,000
Mortgage Loans
Debt Instrument [Line Items]
Gross debt	$ 40,111,000	$ 40,460,000
Stated interest rate on debt	3.42%	2.86%
Mortgage Loans | LIBOR
Debt Instrument [Line Items]
Basis spread on variable rate for debt	1.325%	1.325%

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Derivatives - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Mortgage Loans | LIBOR
Derivative [Line Items]
Basis spread on variable rate for debt	1.325%	1.325%
Interest Rate Cap
Derivative [Line Items]
Premium paid on derivative for right to receive cash payments	$ 2,000
Floor interest rate on derivative	2.35%
Cap interest rate on derivative	3.675%
Interest Rate Cap | Other assets
Derivative [Line Items]
Derivative asset, notional amount	$ 35,000	$ 35,000

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Derivatives - Volume and Fair Value (Details) - Interest Rate Cap - Other assets $ in Thousands	Mar. 31, 2018 USD ($) derivative_instrument	Dec. 31, 2017 USD ($) derivative_instrument
Derivative [Line Items]
Number of Instruments | derivative_instrument	1	1
Notional Amount	$ 35,000	$ 35,000
Estimated Fair Value	$ 2,306	$ 1,731

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Derivatives - Pre-tax Impact of Change in Fair Value (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Interest Rate Cap | Interest expense
Derivative [Line Items]
Gains (Losses) Recognized in Income on Derivatives	$ 575	$ 0

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Shareholders' Equity (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended	3 Months Ended		12 Months Ended
	Feb. 28, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2015	Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Authorized common stock (in shares)		100,000,000			100,000,000
Authorized preferred stock (in shares)		50,000,000			50,000,000
Quarterly dividend declared, per share (USD per share)		$ 0.310	$ 0.31
Dividend declared		$ 16.6	$ 16.5
Total authorizations which remain available for use		$ 109.6
Common shares acquired (in shares)		0	0
Bonus compensation shares issued (in shares)	2,500
Non-credit loss, net of tax		$ 0.6			$ 0.5
Statutory income tax rate		35.00%	35.00%
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards in period (in shares)	85,800
Fair value of each unit awarded (USD per share)	$ 44.73
Award vesting period		3 years
Shares issued in period for share-based compensation (in shares)	52,800
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Awards in period (in shares)	27,200
Shares issued in period for share-based compensation (in shares)	80,600
Performance Share Units | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award payout rate		50.00%
Performance Share Units | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award payout rate		200.00%
Performance Shares Granted in 2015 | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award payout rate				125.00%
Accumulated Other Comprehensive Income (Loss)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reclassification from AOCI to retained earnings for stranded tax effects		$ 3.4
Retained Earnings
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Reclassification from AOCI to retained earnings for stranded tax effects		$ (3.4)

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Shareholders' Equity (Share-based Compensation Expense and Related Tax Benefits) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Equity [Abstract]
Share-based compensation expense	$ 902	$ 3,346
Related tax benefits	$ 190	$ 1,171

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Shareholders' Equity (AOCI Reclassification) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reclassifications from AOCI to net income:
Realized investment gains (losses)	$ 2,417	$ 1,616
Tax effect	(508)	(566)
Net reclassification adjustments	1,909	1,050
Deferred tax expense (benefit) included in OCI	$ (7,060)	$ 1,481
Tax rate used to compute the tax effect of amounts reclassified out of OCI	35.00%	35.00%

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Variable Interest Entities (Details) $ in Millions	Mar. 31, 2018 USD ($)
Variable Interest Entity, Not Primary Beneficiary | Investment in unconsolidated subsidiaries
Variable Interest Entity [Line Items]
VIE interests carrying value	$ 316.3

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Earnings Per Share (Details) - $ / shares	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Earnings Per Share [Abstract]
Weighted average number of common shares outstanding, basic (in shares)	53,515,000	53,315,000
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Weighted average number of common shares outstanding, diluted (in shares)	53,682,000	53,535,000
Effect of dilutive shares on earnings per share (usd per share)	$ 0.00	$ (0.01)
Antidilutive shares excluded from computation of earnings per share (in shares)	0	0
Restricted Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive securities (in shares)	82,000	78,000
Performance Share Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive securities (in shares)	66,000	121,000
Purchase Match Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Dilutive securities (in shares)	19,000	21,000

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Segment Information (Narrative) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2018 USD ($) segment	Mar. 31, 2017 USD ($)	Jan. 01, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Number of operating segments | segment	4
Segregated portfolio cells dividend expense (income)	$ 1,747	$ 2,375
Income tax benefit (expense)	$ 3,422	1,224
Workers' Compensation
Segment Reporting Information [Line Items]
Worker's compensation SPC percentage ceded	100.00%
Lloyd's Syndicate
Segment Reporting Information [Line Items]
Proportion of Capital Provided to support Lloyd's Syndicate 1729			62.00%	58.00%
Specialty Property and Casualty [Member]
Segment Reporting Information [Line Items]
Premiums ceded under quota share agreement	$ 1,900	3,500
Operating Segments | Workers' Compensation
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	1,894	1,174
Income tax benefit (expense)	0	0
Operating Segments | Lloyd's Syndicate
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	0	0
Income tax benefit (expense)	(6)	7
Operating Segments | Specialty Property and Casualty [Member]
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	(30)	(28)
Income tax benefit (expense)	0	0
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Segregated portfolio cells dividend expense (income)	(117)	1,229
Income tax benefit (expense)	$ 3,428	$ 1,217

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Segment Information (Financial Data by Segment) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net premiums earned	$ 187,159	$ 182,903
Net investment income	22,027	23,186
Equity in earnings (loss) of unconsolidated subsidiaries	1,640	1,808
Net realized gains (losses)	(12,517)	13,280
Other income (expense)	2,723	1,821
Net losses and loss adjustment expenses	(129,786)	(119,151)
Underwriting, policy acquisition and operating expenses	(57,360)	(57,108)
Segregated portfolio cells dividend (expense) income	(1,747)	(2,375)
Interest expense	(3,705)	(4,133)
Income tax benefit (expense)	3,422	1,224
Segment operating results	11,856	41,455
Depreciation and amortization, net of accretion	6,079	7,803
Specialty P&C
Segment Reporting Information [Line Items]
Net premiums earned	116,276	113,058
Workers' Compensation
Segment Reporting Information [Line Items]
Net premiums earned	58,407	55,283
Lloyd's Syndicate
Segment Reporting Information [Line Items]
Net premiums earned	12,476	14,562
Operating Segments | Specialty P&C
Segment Reporting Information [Line Items]
Net premiums earned	116,276	113,058
Net investment income	0	0
Equity in earnings (loss) of unconsolidated subsidiaries	0	0
Net realized gains (losses)	0	0
Other income (expense)	1,256	1,198
Net losses and loss adjustment expenses	(84,585)	(74,994)
Underwriting, policy acquisition and operating expenses	(28,276)	(25,977)
Segregated portfolio cells dividend (expense) income	30	28
Interest expense	0	0
Income tax benefit (expense)	0	0
Segment operating results	4,701	13,313
Depreciation and amortization, net of accretion	1,867	1,911
Operating Segments | Workers' Compensation
Segment Reporting Information [Line Items]
Net premiums earned	58,407	55,283
Net investment income	0	0
Equity in earnings (loss) of unconsolidated subsidiaries	0	0
Net realized gains (losses)	0	0
Other income (expense)	366	145
Net losses and loss adjustment expenses	(36,715)	(34,650)
Underwriting, policy acquisition and operating expenses	(17,333)	(16,691)
Segregated portfolio cells dividend (expense) income	(1,894)	(1,174)
Interest expense	0	0
Income tax benefit (expense)	0	0
Segment operating results	2,831	2,913
Depreciation and amortization, net of accretion	956	837
Operating Segments | Lloyd's Syndicate
Segment Reporting Information [Line Items]
Net premiums earned	12,476	14,562
Net investment income	751	372
Equity in earnings (loss) of unconsolidated subsidiaries	0	0
Net realized gains (losses)	(54)	27
Other income (expense)	331	391
Net losses and loss adjustment expenses	(8,486)	(9,507)
Underwriting, policy acquisition and operating expenses	(7,246)	(6,211)
Segregated portfolio cells dividend (expense) income	0	0
Interest expense	0	0
Income tax benefit (expense)	(6)	7
Segment operating results	(2,234)	(359)
Depreciation and amortization, net of accretion	(1)	(3)
Operating Segments | Corporate
Segment Reporting Information [Line Items]
Net premiums earned	0	0
Net investment income	21,276	22,814
Equity in earnings (loss) of unconsolidated subsidiaries	1,640	1,808
Net realized gains (losses)	(12,463)	13,253
Other income (expense)	943	173
Net losses and loss adjustment expenses	0	0
Underwriting, policy acquisition and operating expenses	(4,678)	(8,315)
Segregated portfolio cells dividend (expense) income	117	(1,229)
Interest expense	(3,705)	(4,133)
Income tax benefit (expense)	3,428	1,217
Segment operating results	6,558	25,588
Depreciation and amortization, net of accretion	3,257	5,058
Inter-segment Eliminations
Segment Reporting Information [Line Items]
Net premiums earned	0	0
Net investment income	0	0
Equity in earnings (loss) of unconsolidated subsidiaries	0	0
Net realized gains (losses)	0	0
Other income (expense)	(173)	(86)
Net losses and loss adjustment expenses	0	0
Underwriting, policy acquisition and operating expenses	173	86
Segregated portfolio cells dividend (expense) income	0	0
Interest expense	0	0
Income tax benefit (expense)	0	0
Segment operating results	0	0
Depreciation and amortization, net of accretion	$ 0	$ 0

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Segment Information (Gross Premiums Earned by Product and Reconciliation to Net Premiums) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Segment Reporting Information [Line Items]
Net premiums earned	$ 187,159	$ 182,903
Specialty P&C
Segment Reporting Information [Line Items]
Ceded premiums earned	(17,422)	(18,724)
Net premiums earned	116,276	113,058
Specialty P&C | Healthcare professional liability
Segment Reporting Information [Line Items]
Gross premiums earned	118,685	117,051
Specialty P&C | Legal professional liability
Segment Reporting Information [Line Items]
Gross premiums earned	6,391	6,317
Specialty P&C | Medical technology liability
Segment Reporting Information [Line Items]
Gross premiums earned	8,512	8,312
Specialty P&C | Other
Segment Reporting Information [Line Items]
Gross premiums earned	110	102
Workers' Compensation
Segment Reporting Information [Line Items]
Ceded premiums earned	(7,004)	(5,931)
Net premiums earned	58,407	55,283
Workers' Compensation | Traditional business
Segment Reporting Information [Line Items]
Gross premiums earned	46,030	41,768
Workers' Compensation | Alternative market business
Segment Reporting Information [Line Items]
Gross premiums earned	19,381	19,446
Lloyd's Syndicate
Segment Reporting Information [Line Items]
Ceded premiums earned	(5,491)	(2,623)
Net premiums earned	12,476	14,562
Lloyd's Syndicate | Property and casualty
Segment Reporting Information [Line Items]
Gross premiums earned	$ 17,967	$ 17,185