Employers (EIG) 10-Q 30 Oct 14 2014 Q3 Quarterly report Financial data

Document_and_Entity_Informatio

Document and Entity Information	9 Months Ended
	Sep. 30, 2014	Oct. 23, 2014
Document and Entity Information [Abstract]	'	'
Document Type	'10-Q	'
Amendment Flag	'false	'
Document Period End Date	30-Sep-14	'
Entity Registrant Name	'Employers Holdings, Inc.	'
Entity Central Index Key	'0001379041	'
Current Fiscal Year End Date	'--12-31	'
Entity Well Know Seasoned Issuer	'Yes	'
Entity Voluntary Filers	'No	'
Entity Current Reporting Status	'Yes	'
Entity Filer Category	'Large Accelerated Filer	'
Entity Common Stock Shares Outstanding	'	31,489,468
Document Fiscal Year Focus	'2014	'
Document Fiscal Period Focus	'Q3	'

Consolidated_Balance_Sheets

Consolidated Balance Sheets (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Available for sale:	'	'
Fixed maturity securities at fair value (amortized cost $2,202,822 at September 30, 2014 and $2,116,064 at December 31, 2013)	$2,290,718	$2,182,546
Equity securities at fair value (cost $95,984 at September 30, 2014 and $89,689 at December 31, 2013)	164,548	162,312
Total investments	2,455,266	2,344,858
Cash and cash equivalents	59,006	34,503
Restricted cash and cash equivalents	20,786	6,564
Accrued investment income	19,485	20,255
Premiums receivable (less bad debt allowance of $7,819 at September 30, 2014 and $7,064 at December 31, 2013)	315,115	279,080
Reinsurance recoverable for:	'	'
Paid losses	7,954	8,412
Unpaid losses, including bad debt allowance of $389 at December 31, 2013	690,471	742,666
Deferred policy acquisition costs	47,935	43,532
Deferred income taxes, net	51,333	58,062
Property and equipment, net	19,902	16,616
Intangible assets, net	9,180	9,685
Goodwill	36,192	36,192
Contingent commission receivable—LPT Agreement	23,078	25,104
Other assets	23,479	17,920
Total assets	3,779,182	3,643,449
Claims and policy liabilities:	'	'
Unpaid losses and loss adjustment expenses	2,370,268	2,330,491
Unearned premiums	335,826	303,967
Total claims and policy liabilities	2,706,094	2,634,458
Commissions and premium taxes payable	47,287	45,314
Accounts payable and accrued expenses	20,069	18,711
Deferred reinsurance gain—LPT Agreement	218,654	249,072
Notes payable	102,000	102,000
Other liabilities	32,485	25,191
Total liabilities	3,126,589	3,074,746
Commitments and contingencies	'	'
Stockholders’ equity:	'	'
Common stock, $0.01 par value; 150,000,000 shares authorized; 54,862,442 and 54,672,904 shares issued and 31,489,468 and 31,299,930 shares outstanding at September 30, 2014 and December 31, 2013, respectively	549	547
Preferred stock, $0.01 par value; 25,000,000 shares authorized; none issued	0	0
Additional paid-in capital	344,814	338,090
Retained earnings	568,080	502,198
Accumulated other comprehensive income, net	101,700	90,418
Treasury stock, at cost (23,372,974 shares at September 30, 2014 and December 31, 2013)	-362,550	-362,550
Total stockholders’ equity	652,593	568,703
Total liabilities and stockholders’ equity	$3,779,182	$3,643,449

Consolidated_Balance_Sheets_Pa

Consolidated Balance Sheets (Parentheticals) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, except Share data, unless otherwise specified
Available for sale:	'	'
Fixed maturity securities, amortized cost	$2,298,806	$2,205,753
Premiums receivable, bad debt allowance	7,819	7,064
Reinsurance Recoverables on Unpaid Losses, Allowance	0	389
Stockholders' equity	'	'
Common stock, par value (in dollars per share)	$0.01	$0.01
Common stock, shares authorized (in shares)	150,000,000	150,000,000
Common stock, shares issued (in shares)	54,862,442	54,672,904
Common stock, shares outstanding (in shares)	31,489,468	31,299,930
Preferred stock, par value (in dollars per share)	$0.01	$0.01
Preferred stock, shares authorized (in shares)	25,000,000	25,000,000
Preferred stock, shares issued (in shares)	0	0
Treasury stock, at cost (in shares)	23,372,974	23,372,974
Debt Securities [Member]	'	'
Available for sale:	'	'
Fixed maturity securities, amortized cost	2,202,822	2,116,064
Equity Securities [Member]	'	'
Available for sale:	'	'
Fixed maturity securities, amortized cost	$95,984	$89,689

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues	'	'	'	'
Net premiums earned	$172,053	$164,429	$511,866	$472,357
Net investment income	18,179	17,799	54,477	52,849
Net realized gains on investments	1,776	1,075	14,202	5,735
Other income	48	29	274	276
Total revenues	192,056	183,332	580,819	531,217
Expenses	'	'	'	'
Losses and loss adjustment expenses	122,357	105,767	343,137	326,677
Commission expense	20,607	19,946	60,983	58,466
Underwriting and other operating expenses	31,854	32,493	98,311	96,282
Interest expense	743	815	2,274	2,420
Total expenses	175,561	159,021	504,705	483,845
Net income before income taxes	16,495	24,311	76,114	47,372
Income tax expense (benefit)	1,295	-3,274	4,564	-2,291
Net income	15,200	27,585	71,550	49,663
Earnings per common share (Note 10):	'	'	'	'
Basic	$0.48	$0.88	$2.27	$1.60
Diluted	$0.47	$0.86	$2.23	$1.56
Cash dividends declared per common share	$0.06	$0.06	$0.18	$0.18
Comprehensive income	'	'	'	'
Unrealized gains (losses) during the period (net of tax expense (benefit) of $(3,099) and $2,236 for the three months ended September 30, 2014 and 2013, respectively, and $11,045 and $(18,635) for the nine months ended September 30, 2014 and 2013, respectively)	-5,755	4,154	20,513	-34,607
Reclassification adjustment for realized gains in net income (net of taxes of $622 and $376 for the three months ended September 30, 2014 and 2013, respectively, and $4,971 and $2,007 for the nine months ended September 30, 2014 and 2013, respectively)	-1,154	-699	-9,231	-3,728
Other comprehensive income (loss), net of tax	-6,909	3,455	11,282	-38,335
Total comprehensive income	8,291	31,040	82,832	11,328
Net realized gains on investments	'	'	'	'
Net realized gains on investments before credit related impairments on fixed maturity securities	1,917	1,075	14,343	5,803
Other than temporary impairment, credit losses recognized in earnings	-141	0	-141	-68
Net realized gains on investments	$1,776	$1,075	$14,202	$5,735

Conolidated_Statements_of_Comp

Conolidated Statements of Comprehensive Income (Parentheticals) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Income Statement Parenthetical [Abstract]	'	'	'	'
Other comprehensive income (loss), unrealized holding gain (loss) on securities arising during period, tax	($3,099)	$2,236	$11,045	($18,635)
Other comprehensive income (loss), reclassification adjustment for sale of securities included in net income, tax	$622	$376	$4,971	$2,007

Consolidated_Statements_of_Cas

Consolidated Statements of Cash Flows (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Operating activities	'	'
Net income	$71,550	$49,663
Adjustments to reconcile net income to net cash provided by operating activities:	'	'
Depreciation and amortization	5,240	4,324
Stock-based compensation	4,310	5,815
Amortization of premium on investments, net	7,809	6,574
Deferred income tax expense	655	-5,482
Net realized gains on investments	-14,202	-5,735
Excess tax benefits from stock-based compensation	-1,154	-386
Other	352	1,007
Change in operating assets and liabilities:	'	'
Premiums receivable	-36,790	-61,368
Reinsurance recoverable for paid and unpaid losses	53,042	26,065
Federal income taxes	4,424	-925
Unpaid losses and loss adjustment expenses	39,777	73,767
Unearned premiums	31,859	53,834
Accounts payable, accrued expenses and other liabilities	8,652	6,201
Deferred reinsurance gain—LPT Agreement	-30,418	-20,441
Contingent commission receivable—LPT Agreement	2,026	-2,247
Other	-10,736	-6,622
Net cash provided by operating activities	136,396	124,044
Investing activities	'	'
Purchase of fixed maturity securities	-293,689	-340,343
Purchase of equity securities	-20,565	-22,058
Proceeds from sale of fixed maturity securities	42,232	32,706
Proceeds from sale of equity securities	27,614	22,266
Proceeds from maturities and redemptions of investments	158,252	148,418
Proceeds from sale of fixed assets	0	285
Capital expenditures	-8,510	-5,552
Restricted cash and cash equivalents used in investing activities	-14,222	-725
Net cash used in investing activities	-108,888	-165,003
Financing activities	'	'
Cash transactions related to stock-based compensation	1,492	5,315
Dividends paid to stockholders	-5,651	-5,580
Excess tax benefits from stock-based compensation, financing activities	1,154	386
Net cash (used in) provided by financing activities	-3,005	121
Net increase (decrease) in cash and cash equivalents	24,503	-40,838
Cash and cash equivalents at the beginning of the period	34,503	140,661
Cash and cash equivalents at the end of the period	$59,006	$99,823

Basis_of_Presentation

Basis of Presentation	9 Months Ended
	Sep. 30, 2014
Basis of Presentation [Abstract]	'
Basis of Presentation	'
	Basis of Presentation and Summary of Operations
	Employers Holdings, Inc. (EHI) is a Nevada holding company. Through its wholly owned insurance subsidiaries, Employers Insurance Company of Nevada (EICN), Employers Compensation Insurance Company (ECIC), Employers Preferred Insurance Company (EPIC), and Employers Assurance Company (EAC), EHI is engaged in the commercial property and casualty insurance industry, specializing in workers' compensation products and services. Unless otherwise indicated, all references to the “Company” refer to EHI, together with its subsidiaries.
	The accompanying consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles (GAAP) for interim financial information and with the instructions to Form 10-Q and Article 10 of Regulation S-X of the Securities Exchange Act of 1934, as amended. 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 (consisting of normal, recurring adjustments) necessary for a fair presentation of the Company’s consolidated financial position and results of operations for the periods presented have been included. The results of operations for an interim period are not necessarily indicative of the results for an entire year. These financial statements have been prepared consistent with the accounting policies described in the Company’s Annual Report on Form 10-K for the year ended December 31, 2013.
	The Company considers an operating segment to be any component of its business whose operating results are regularly reviewed by the Company’s chief operating decision maker to make decisions about resources to be allocated to the segment and assess its performance based on discrete financial information. Currently, the Company has one operating segment, workers’ compensation insurance and related services.
	Use of Estimates
	The preparation of the consolidated financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, and disclosure of contingent assets and liabilities, at the date of the consolidated financial statements, as well as the reported amounts of revenues and expenses during the reporting period. As a result, actual results could differ from these estimates. The most significant areas that require management judgment are the estimate of unpaid losses and loss adjustment expenses (LAE), evaluation of reinsurance recoverables, recognition of premium revenue, deferred income taxes, valuation of investments, and the valuation of goodwill and intangible assets.

Change_in_Estimate_Level_1_Not

Change in Estimate Level 1 (Notes)	9 Months Ended
	Sep. 30, 2014
Accounting Changes and Error Corrections [Abstract]	'
Accounting Changes and Error Corrections	'
	Changes in Estimates
	During the nine months ended September 30, 2014, the Company reduced its estimated reserves ceded under the Loss Portfolio Transfer Agreement (LPT Agreement) by $33.3 million. This change in estimate resulted in a $22.3 million cumulative adjustment to the deferred reinsurance gain–LPT Agreement (Deferred Gain), which was also recognized in losses and LAE in the consolidated statement of comprehensive income, so that the Deferred Gain reflects the balance that would have existed had the revised reserves been recognized at the inception of the LPT Agreement (LPT Reserve Adjustment). This change in estimate was the result of the determination that an adjustment was necessary to reflect observed favorable paid loss trends. This change in estimate increased net income by $22.3 million, or $0.71 and $0.70 per basic and diluted share, respectively, for the nine months ended September 30, 2014.
	During the nine months ended September 30, 2014, the Company increased its estimate of contingent commission receivable – LPT Agreement as a result of the determination that an adjustment was necessary to reflect observed favorable paid loss trends. This change in estimate resulted in a $7.9 million cumulative adjustment to the Deferred Gain, which was also recognized in losses and LAE incurred in the consolidated statement of comprehensive income, so that the Deferred Gain reflects the balance that would have existed had the revised reserves been recognized at the inception of the LPT Agreement (LPT Contingent Commission Adjustment). This change in estimate increased net income by $7.9 million, or $0.25 per basic and diluted share, for the nine months ended September 30, 2014.
	During the nine months ended September 30, 2014, the Company reallocated $12.0 million in reserves from non-taxable periods prior to January 1, 2000 to taxable years, which reduced our effective tax rate by 3.5 percentage points for the nine months ended September 30, 2014. This change in estimate was the result of the determination that a reallocation of reserves among accident years was appropriate to address a continuation of observed loss trends. The income tax impact of this change in estimate increased net income by $2.7 million, or $0.09 and $0.08 per basic and diluted share, respectively, for the nine months ended September 30, 2014.

Fair_Value_of_Financial_Instru

Fair Value of Financial Instruments	9 Months Ended
	Sep. 30, 2014
Fair Value of Financial Instruments [Abstract]	'
Fair Value of Financial Instruments	'
	Fair Value of Financial Instruments
	The carrying value and the estimated fair value of the Company’s financial instruments were as follows:
			September 30, 2014				December 31, 2013
			Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
			(in thousands)
	Financial assets
	Investments		$	2,455,266	$	2,455,266	$	2,344,858	$	2,344,858
	Cash and cash equivalents		59,006		59,006		34,503		34,503
	Restricted cash and cash equivalents		20,786		20,786		6,564		6,564
	Financial liabilities
	Notes payable		102,000		106,444		102,000		105,450
	The Company's estimates of fair value for financial liabilities are based on a combination of the variable interest rates for the Company's existing line of credit and other notes with similar durations to discount the projection of future payments on notes payable, and have been determined to be Level 2 fair value measurements, as defined below.
	Assets and liabilities recorded at fair value on the consolidated balance sheets are categorized based upon the levels of judgment associated with the inputs used to measure their fair value. Level inputs are defined as follows:
	•	Level 1 - Inputs are unadjusted quoted market prices for identical assets or liabilities in active markets at the measurement date.
	•	Level 2 - Inputs other than Level 1 prices that are observable for similar assets or liabilities through corroboration with market data at the measurement date.
	•	Level 3 - Inputs that are unobservable that reflect management's best estimate of what willing market participants would use in pricing the assets or liabilities at the measurement date.
	The following methods and assumptions were used to determine the fair value of each class of assets and liabilities recorded at fair value in the consolidated balance sheets.
	Fair value of available-for-sale fixed maturity and equity securities is based on quoted market prices, where available, and is obtained primarily from third-party pricing services, which generally use Level 1 or Level 2 inputs. The Company obtains a quoted price for each security from third party pricing services. The quoted prices are derived through recently reported trades for identical or similar securities. For securities not actively traded, the third party pricing services may use quoted market prices of similar instruments or discounted cash flow analyses, incorporating inputs that are currently observable in the markets for similar securities. Inputs that are often used in the valuation methodologies include, but are not limited to, broker quotes, benchmark yields, credit spreads, default rates, and prepayment speeds. The Company also performs a quarterly analysis on the prices received from third party pricing services to determine whether the prices are reasonable estimates of fair value, including confirming the fair values of these securities through observable market prices using an alternative pricing source. If differences are noted in this review, the Company may obtain additional information from other pricing services to validate the quoted price. There were no adjustments to prices obtained from third party pricing services as of September 30, 2014 or December 31, 2013 that were material to the Company's consolidated financial statements.
	If quoted market prices and an estimate determined by using objectively verifiable information are unavailable, the Company produces an estimate of fair value based on internally developed valuation techniques, which, depending on the level of observable market inputs, will render the fair value estimate as Level 2 or Level 3. The Company bases all of its estimates of fair value for assets on the bid price as it represents what a third-party market participant would be willing to pay in an arm's length transaction.
	These methods of valuation will only produce an estimate of fair value if there is objectively verifiable information to produce a valuation. If objectively verifiable information is not available, the Company would be required to produce an estimate of fair value using some of the same methodologies, making assumptions for market-based inputs that are unavailable.
	Estimates of fair value for fixed maturity securities are based on estimates using objectively verifiable information and are included in the amount disclosed in Level 2 of the hierarchy. The Level 3 fair value estimates include the Company's assumptions about risk assessments and market participant assumptions based on the best information available, including quotes from market makers and other broker/dealers recognized as market participants, using standard or trade derived inputs, new issue data, monthly payment information, cash flow generation, prepayment speeds, spread adjustments, or rating updates.
	The following table presents the items on the accompanying consolidated balance sheets that are stated at fair value and the corresponding fair value measurements.
			September 30, 2014						December 31, 2013
			Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
			(in thousands)
	Fixed maturity securities
	U.S. Treasuries		$	—	$	171,295	$	—	$	—	$	170,897	$	—
	U.S. Agencies		—		48,795		—		—		68,118		—
	States and municipalities		—		749,523		—		—		735,180		—
	Corporate securities		—		911,271		—		—		833,296		—
	Residential mortgage-backed securities		—		288,144		—		—		258,431		—
	Commercial mortgage-backed securities		—		61,564		—		—		65,110		—
	Asset-backed securities		—		60,126		—		—		51,514		—
	Total fixed maturity securities		—		2,290,718		—		—		2,182,546		—
	Equity securities		$	164,548	$	—	$	—	$	162,312	$	—	$	—

Investments

Investments	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Investments	'
	Investments
	The cost or amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s investments were as follows:
		Cost or Amortized			Gross			Gross				Estimated
		Cost			Unrealized			Unrealized				Fair Value
					Gains			Losses
		(in thousands)
	At September 30, 2014
	Fixed maturity securities
	U.S. Treasuries	$	165,159		$	6,197		$	(61	)		$	171,295
	U.S. Agencies	46,268			2,527			—				48,795
	States and municipalities	703,112			46,702			(291		)		749,523
	Corporate securities	884,551			30,983			(4,263		)		911,271
	Residential mortgage-backed securities	281,125			8,995			(1,976		)		288,144
	Commercial mortgage-backed securities	62,297			348			(1,081		)		61,564
	Asset-backed securities	60,310			27			(211		)		60,126
	Total fixed maturity securities	2,202,822			95,779			(7,883		)		2,290,718
	Equity securities	95,984			69,480			(916		)		164,548
	Total investments	$	2,298,806		$	165,259		$	(8,799	)		$	2,455,266
	At December 31, 2013
	Fixed maturity securities
	U.S. Treasuries	$	163,951		$	7,073		$	(127	)		$	170,897
	U.S. Agencies	64,985			3,137			(4		)		68,118
	States and municipalities	698,979			40,595			(4,394		)		735,180
	Corporate securities	814,283			28,671			(9,658		)		833,296
	Residential mortgage-backed securities	255,187			7,979			(4,735		)		258,431
	Commercial mortgage-backed securities	67,066			316			(2,272		)		65,110
	Asset-backed securities	51,613			54			(153		)		51,514
	Total fixed maturity securities	2,116,064			87,825			(21,343		)		2,182,546
	Equity securities	89,689			72,844			(221		)		162,312
	Total investments	$	2,205,753		$	160,669		$	(21,564	)		$	2,344,858
	The amortized cost and estimated fair value of fixed maturity securities at September 30, 2014, by contractual maturity, are shown below. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
		Amortized Cost			Estimated Fair Value
		(in thousands)
	Due in one year or less	$	167,908		$	169,932
	Due after one year through five years	799,473			836,312
	Due after five years through ten years	668,703			695,413
	Due after ten years	163,006			179,227
	Mortgage and asset-backed securities	403,732			409,834
	Total	$	2,202,822		$	2,290,718
	The following is a summary of investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or greater as of September 30, 2014 and December 31, 2013.
		September 30, 2014									December 31, 2013
		Estimated Fair Value			Gross Unrealized Losses			Number of Issues			Estimated Fair Value				Gross Unrealized Losses			Number of Issues
		(dollars in thousands)
	Less than 12 months:
	Fixed maturity securities
	U.S. Treasuries	$	24,935		$	(46	)	6			$	22,242			$	(127	)	7
	U.S. Agencies	—			—			—			1,631				(4		)	1
	States and municipalities	5,918			(66		)	3			127,965				(4,394		)	34
	Corporate securities	131,672			(1,069		)	40			326,608				(9,536		)	112
	Residential mortgage-backed securities	34,663			(124		)	24			129,586				(4,170		)	58
	Commercial mortgage-backed securities	58			(1		)	1			35,878				(1,372		)	9
	Asset-backed securities	27,708			(99		)	15			25,825				(52		)	13
	Total fixed maturity securities	224,954			(1,405		)	89			669,735				(19,655		)	234
	Equity securities	13,152			(889		)	25			6,140				(208		)	17
	Total less than 12 months	$	238,106		$	(2,294	)	114			$	675,875			$	(19,863	)	251
	12 months or greater:
	Fixed maturity securities
	U.S. Treasuries	$	1,381		$	(15	)	1			$	—			$	—		—
	States and municipalities	22,049			(225		)	5			—				—			—
	Corporate securities	129,577			(3,194		)	41			6,174				(122		)	3
	Residential mortgage-backed securities	57,621			(1,852		)	30			5,609				(565		)	11
	Commercial mortgage-backed securities	30,813			(1,080		)	8			9,324				(900		)	3
	Asset-backed securities	14,116			(112		)	3			8,938				(101		)	3
Total fixed maturity securities	255,557			(6,478		)	88			30,045				(1,688		)	20
Equity securities	447			(27		)	2			303				(13		)	1
Total 12 months or greater	$	256,004		$	(6,505	)	90			$	30,348			$	(1,701	)	21
Total available-for-sale:
Fixed maturity securities
U.S. Treasuries	$	26,316		$	(61	)	7			$	22,242			$	(127	)	7
U.S. Agencies	—			—			—			1,631				(4		)	1
States and municipalities	27,967			(291		)	8			127,965				(4,394		)	34
Corporate securities	261,249			(4,263		)	81			332,782				(9,658		)	115
Residential mortgage-backed securities	92,284			(1,976		)	54			135,195				(4,735		)	69
Commercial mortgage-backed securities	30,871			(1,081		)	9			45,202				(2,272		)	12
Asset-backed securities	41,824			(211		)	18			34,763				(153		)	16
Total fixed maturity securities	480,511			(7,883		)	177			699,780				(21,343		)	254
Equity securities	13,599			(916		)	27			6,443				(221		)	18
Total available-for-sale	$	494,110		$	(8,799	)	204			$	706,223			$	(21,564	)	272
Based on reviews of the fixed maturity securities, the Company determined that unrealized losses for the nine months ended September 30, 2014 were primarily the result of changes in prevailing interest rates and not the credit quality of the issuers. The fixed maturity securities whose total fair value was less than amortized cost were not determined to be other-than-temporarily impaired given the severity and duration of the impairment, the credit quality of the issuers, the Company’s intent to not sell the securities, and a determination that it is not more likely than not that the Company will be required to sell the securities until fair value recovers to above cost, or maturity.
Based on reviews of the equity securities, the Company recognized a total impairment of $0.1 million in the fair value of four equity securities for the nine months ended September 30, 2014 as a result of the severity and duration of the change in fair value of the securities. The remaining unrealized losses on equity securities were not considered to be other-than-temporary due to the financial condition and near-term prospects of the issuers.
Net realized gains on investments and the change in unrealized gains (losses) on fixed maturity and equity securities are determined on a specific-identification basis and were as follows:
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014				2013
	(in thousands)
Net realized gains on investments
Fixed maturity securities
Gross gains	$	6		$	215		$	859			$	216
Gross losses	—			(7		)	(1		)		(7		)
Net realized gains on fixed maturity securities	$	6		$	208		$	858			$	209
Equity securities
Gross gains	$	1,910		$	868		$	13,486			$	5,845
Gross losses	(140		)	(1		)	(142		)		(319		)
Net realized gains on equity securities	$	1,770		$	867		$	13,344			$	5,526
Total	$	1,776		$	1,075		$	14,202			$	5,735
Change in unrealized gains (losses)
Fixed maturity securities	$	(9,925	)	$	(1,086	)	$	21,414			$	(76,168	)
Equity securities	(706		)	6,401			(4,059		)		17,191
Total	$	(10,631	)	$	5,315		$	17,355			$	(58,977	)
Net investment income was as follows:
	Three Months Ended						Nine Months Ended
	September 30,						September 30,
	2014			2013			2014				2013
	(in thousands)
Fixed maturity securities	$	17,848		$	17,465		$	53,349			$	51,991
Equity securities	1,025			950			3,032				2,733
Cash equivalents and restricted cash	15			19			48				82
	18,888			18,434			56,429				54,806
Investment expenses	(709		)	(635		)	(1,952		)		(1,957		)
Net investment income	$	18,179		$	17,799		$	54,477			$	52,849
The Company is required by various state laws and regulations to keep securities or letters of credit in depository accounts with certain states in which it does business. As of September 30, 2014 and December 31, 2013, securities having a fair value of $782.7 million and $602.4 million, respectively, were on deposit. These laws and regulations govern not only the amount, but also the types of securities that are eligible for deposit. The deposits are limited to fixed maturity securities in all states. Additionally, certain reinsurance contracts require Company funds to be held in trust for the benefit of the ceding reinsurer to secure the outstanding liabilities assumed by the Company. The fair value of fixed maturity securities held in trust for the benefit of ceding reinsurers at September 30, 2014 and December 31, 2013 was $31.1 million and $32.2 million, respectively. Pursuant to the Third Amended and Restated Credit Agreement with Wells Fargo (Amended Credit Facility), a portion of the Company's debt was secured by fixed maturity securities and restricted cash and cash equivalents that had a fair value of $85.1 million and $95.1 million at September 30, 2014 and December 31, 2013, respectively.

Income_Taxes

Income Taxes	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Income Taxes	'
	Income Taxes
	Income tax expense for interim periods is measured using an estimated effective tax rate for the annual period. The following is a reconciliation of the federal statutory income tax rate to the Company’s effective tax rates for the periods presented.
		Nine Months Ended
		September 30,
		2014		2013
	Expense computed at statutory rate	35	%	35	%
	Dividends received deduction and tax-exempt interest	(9.4	)	(15.0	)
	LPT deferred gain amortization	(7.7	)	(9.3	)
	LPT reserve adjustment	(8.4	)	(6.0	)
	Pre-privatization reserve adjustment, excluding LPT	(3.5	)	(10.5	)
	Other	—		1
	Effective tax rate	6	%	(4.8	)%

Liability_for_Unpaid_Losses_an

Liability for Unpaid Losses and Loss Adjustment Expenses	9 Months Ended
	Sep. 30, 2014
Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]	'
Liability for Unpaid Losses and Loss Adjustment Expenses	'
	Liability for Unpaid Losses and Loss Adjustment Expenses
	The following table represents a reconciliation of changes in the liability for unpaid losses and LAE.
		Nine Months Ended
		September 30,
		2014		2013
		(in thousands)
	Unpaid losses and LAE, gross of reinsurance, at beginning of period	$	2,330,491	$	2,231,540
	Less reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	743,055		805,386
	Net unpaid losses and LAE at beginning of period	1,587,436		1,426,154
	Losses and LAE, net of reinsurance, related to:
	Current period	379,233		347,568
	Prior periods	3,992		1,797
	Total net losses and LAE incurred during the period	383,225		349,365
	Deduct payments for losses and LAE, net of reinsurance, related to:
	Current period	44,522		46,347
	Prior periods	246,342		203,707
	Total net payments for losses and LAE during the period	290,864		250,054
	Ending unpaid losses and LAE, net of reinsurance	1,679,797		1,525,465
	Reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	690,471		779,842
	Unpaid losses and LAE, gross of reinsurance, at end of period	$	2,370,268	$	2,305,307
	Total net losses and LAE included in the above table excludes the impact of the amortization of the deferred reinsurance gain—LPT Agreement (Note 7).
	The increase in the estimates of incurred losses and LAE attributable to insured events for prior periods was primarily related to the Company's assigned risk business.

LPT_Agreement

LPT Agreement	9 Months Ended
	Sep. 30, 2014
LPT Agreement [Abstract]	'
LPT Agreement	'
	LPT Agreement
	The Company is party to a 100% quota share retroactive reinsurance agreement (LPT Agreement) under which $1.5 billion in liabilities for losses and LAE related to claims incurred by EICN prior to July 1, 1995 were reinsured for consideration of $775.0 million. The LPT Agreement provides coverage up to $2.0 billion. The initial Deferred Gain resulting from the LPT Agreement was recorded as a liability in the accompanying consolidated balance sheets as Deferred reinsurance gain–LPT Agreement. The Company is also entitled to receive a contingent profit commission under the LPT Agreement. The contingent profit commission is an amount based on the favorable difference between actual paid losses and LAE and expected paid losses and LAE as established in the LPT Agreement. The Company records its estimate of contingent profit commission in the accompanying consolidated balance sheets as Contingent commission receivable–LPT Agreement and a corresponding liability is recorded on the accompanying consolidated balance sheets in Deferred reinsurance gain–LPT Agreement. The Deferred Gain is being amortized using the recovery method. Amortization is determined by the proportion of actual reinsurance recoveries to total estimated recoveries over the life of the LPT Agreement, except for the contingent profit commission, which is amortized through June 30, 2024. The amortization is recorded in losses and LAE incurred in the accompanying consolidated statements of comprehensive income. Any adjustments to the Deferred Gain are recorded in losses and LAE incurred in the accompanying consolidated statements of comprehensive income.
	The Company amortized $40.1 million and $22.7 million of the Deferred Gain for the nine months ended September 30, 2014 and 2013, respectively. The remaining Deferred Gain was $218.7 million and $249.1 million as of September 30, 2014 and December 31, 2013, respectively. The estimated remaining liabilities subject to the LPT Agreement were $555.8 million and $612.1 million as of September 30, 2014 and December 31, 2013, respectively. Losses and LAE paid with respect to the LPT Agreement totaled $660.8 million and $637.9 million through September 30, 2014 and December 31, 2013, respectively.

Accumulated_Other_Comprehensiv

Accumulated Other Comprehensive Income	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income [Abstract]	'
Accumulated Other Comprehensive Income, Net	'
	Accumulated Other Comprehensive Income, net
	Accumulated other comprehensive income, net, is comprised of unrealized gains on investments classified as available-for-sale, net of deferred tax expense. The following table summarizes the components of accumulated other comprehensive income, net:
		September 30, 2014			December 31, 2013
		(in thousands)
	Net unrealized gain on investments, before taxes	$	156,460		$	139,105
	Deferred tax expense on net unrealized gains	(54,760		)	(48,687		)
	Total accumulated other comprehensive income, net	$	101,700		$	90,418

StockBased_Compensation

Stock-Based Compensation	9 Months Ended
	Sep. 30, 2014
Stock-Based Compensation [Abstract]	'
Stock-Based compensation	'
	Stock-Based Compensation
	The Company awarded stock options, restricted stock units (RSUs) and performance share units (PSUs) to certain officers and Directors of the Company as follows:
		Number Awarded	Weighted Average Fair Value on Date of Grant		Weighted Average Exercise Price		Aggregate Fair Value on Date of Grant
							(in millions)
	Mar-14
	Stock options(1)	141,744	$	6.66	$	20.87	$	0.9
	RSUs(1)	63,878	20.87		—		1.3
	PSUs(2)	125,340	20.87		—		2.6
	May-14
	RSUs(1)	22,392	21.43		—		0.5
	-1	The stock options and RSUs awarded in March 2014 were awarded to certain officers of the Company and vest 25% on March 11, 2015, and each of the subsequent three anniversaries of that date. The stock options and RSUs are subject to accelerated vesting in certain circumstances, such as: death or disability, or in connection with change of control of the Company. The stock options expire seven years from the date of grant.
	The RSUs awarded in May 2014 were awarded to non-employee Directors of the Company and have a service vesting period of one year from the grant date.
	-2	The PSUs awarded in March 2014 were awarded to certain officers of the Company and have a performance period of three years and are subject to certain performance goals, based on the Company's statutory combined ratio, with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.
	A total of 116,134 and 411,295 stock options were exercised during the nine months ended September 30, 2014 and the year ended December 31, 2013, respectively.

Earnings_Per_Share

Earnings Per Share	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Earnings Per Share	'
	Earnings Per Share
	Basic earnings per share excludes dilution and is computed by dividing income applicable to stockholders by the weighted average number of shares outstanding for the period. Diluted earnings per share reflects the potential dilutive impact of all convertible securities on earnings per share. Diluted earnings per share includes shares assumed issued under the “treasury stock method,” which reflects the potential dilution that would occur if outstanding options were to be exercised. The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014		2013
		(in thousands, except share data)
	Net income available to stockholders—basic and diluted	$	15,200		$	27,585		$	71,550	$	49,663
	Weighted average number of shares outstanding—basic	31,591,457			31,214,230			31,507,097		31,070,571
	Effect of dilutive securities:
	PSUs	279,550			284,217			252,532		211,347
	Stock options	202,010			457,909			230,961		382,871
	RSUs	36,403			77,320			53,538		136,581
	Dilutive potential shares	517,963			819,446			537,031		730,799
	Weighted average number of shares outstanding—diluted	32,109,420			32,033,676			32,044,128		31,801,370
	Diluted earnings per share excludes outstanding options and other common stock equivalents in periods where the inclusion of such options and common stock equivalents would be anti-dilutive. The following table presents options and RSUs that were excluded from diluted earnings per share.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014		2013
	Options excluded as the exercise price was greater than the average market price	271,944		—			141,900		—
	Options and RSUs excluded under the treasury method as the potential proceeds on settlement or exercise price were greater than the value of shares acquired	296,867		165,504			154,044		165,504

Fair_Value_of_Financial_Instru1

Fair Value of Financial Instruments (Tables)	9 Months Ended
	Sep. 30, 2014
Fair Value of Financial Instruments [Abstract]	'
Estimated fair value of financial instruments table	'
	The carrying value and the estimated fair value of the Company’s financial instruments were as follows:
		September 30, 2014				December 31, 2013
		Carrying Value		Estimated Fair Value		Carrying Value		Estimated Fair Value
		(in thousands)
	Financial assets
	Investments	$	2,455,266	$	2,455,266	$	2,344,858	$	2,344,858
	Cash and cash equivalents	59,006		59,006		34,503		34,503
	Restricted cash and cash equivalents	20,786		20,786		6,564		6,564
	Financial liabilities
	Notes payable	102,000		106,444		102,000		105,450
Fair value, assets and liabilities measured on recurring basis table	'
	The following table presents the items on the accompanying consolidated balance sheets that are stated at fair value and the corresponding fair value measurements.
		September 30, 2014						December 31, 2013
		Level 1		Level 2		Level 3		Level 1		Level 2		Level 3
		(in thousands)
	Fixed maturity securities
	U.S. Treasuries	$	—	$	171,295	$	—	$	—	$	170,897	$	—
	U.S. Agencies	—		48,795		—		—		68,118		—
	States and municipalities	—		749,523		—		—		735,180		—
	Corporate securities	—		911,271		—		—		833,296		—
	Residential mortgage-backed securities	—		288,144		—		—		258,431		—
	Commercial mortgage-backed securities	—		61,564		—		—		65,110		—
	Asset-backed securities	—		60,126		—		—		51,514		—
	Total fixed maturity securities	—		2,290,718		—		—		2,182,546		—
	Equity securities	$	164,548	$	—	$	—	$	162,312	$	—	$	—

Investments_Tables

Investments (Tables)	9 Months Ended
	Sep. 30, 2014
Investments [Abstract]	'
Available-for-sale securities table	'
	The cost or amortized cost, gross unrealized gains, gross unrealized losses, and estimated fair value of the Company’s investments were as follows:
		Cost or Amortized			Gross			Gross				Estimated
		Cost			Unrealized			Unrealized				Fair Value
					Gains			Losses
		(in thousands)
	At September 30, 2014
	Fixed maturity securities
	U.S. Treasuries	$	165,159		$	6,197		$	(61	)		$	171,295
	U.S. Agencies	46,268			2,527			—				48,795
	States and municipalities	703,112			46,702			(291		)		749,523
	Corporate securities	884,551			30,983			(4,263		)		911,271
	Residential mortgage-backed securities	281,125			8,995			(1,976		)		288,144
	Commercial mortgage-backed securities	62,297			348			(1,081		)		61,564
	Asset-backed securities	60,310			27			(211		)		60,126
	Total fixed maturity securities	2,202,822			95,779			(7,883		)		2,290,718
	Equity securities	95,984			69,480			(916		)		164,548
	Total investments	$	2,298,806		$	165,259		$	(8,799	)		$	2,455,266
	At December 31, 2013
	Fixed maturity securities
	U.S. Treasuries	$	163,951		$	7,073		$	(127	)		$	170,897
	U.S. Agencies	64,985			3,137			(4		)		68,118
	States and municipalities	698,979			40,595			(4,394		)		735,180
	Corporate securities	814,283			28,671			(9,658		)		833,296
	Residential mortgage-backed securities	255,187			7,979			(4,735		)		258,431
	Commercial mortgage-backed securities	67,066			316			(2,272		)		65,110
	Asset-backed securities	51,613			54			(153		)		51,514
	Total fixed maturity securities	2,116,064			87,825			(21,343		)		2,182,546
	Equity securities	89,689			72,844			(221		)		162,312
	Total investments	$	2,205,753		$	160,669		$	(21,564	)		$	2,344,858
Investments classified by contractual maturity date table	'
	The amortized cost and estimated fair value of fixed maturity securities at September 30, 2014, by contractual maturity, are shown below. Expected maturities differ from contractual maturities because borrowers may have the right to call or prepay obligations with or without call or prepayment penalties.
		Amortized Cost			Estimated Fair Value
		(in thousands)
	Due in one year or less	$	167,908		$	169,932
	Due after one year through five years	799,473			836,312
	Due after five years through ten years	668,703			695,413
	Due after ten years	163,006			179,227
	Mortgage and asset-backed securities	403,732			409,834
	Total	$	2,202,822		$	2,290,718
Unrealized loss on investments table	'
	The following is a summary of investments that have been in a continuous unrealized loss position for less than 12 months and those that have been in a continuous unrealized loss position for 12 months or greater as of September 30, 2014 and December 31, 2013.
		September 30, 2014									December 31, 2013
		Estimated Fair Value			Gross Unrealized Losses			Number of Issues			Estimated Fair Value				Gross Unrealized Losses			Number of Issues
		(dollars in thousands)
	Less than 12 months:
	Fixed maturity securities
	U.S. Treasuries	$	24,935		$	(46	)	6			$	22,242			$	(127	)	7
	U.S. Agencies	—			—			—			1,631				(4		)	1
	States and municipalities	5,918			(66		)	3			127,965				(4,394		)	34
	Corporate securities	131,672			(1,069		)	40			326,608				(9,536		)	112
	Residential mortgage-backed securities	34,663			(124		)	24			129,586				(4,170		)	58
	Commercial mortgage-backed securities	58			(1		)	1			35,878				(1,372		)	9
	Asset-backed securities	27,708			(99		)	15			25,825				(52		)	13
	Total fixed maturity securities	224,954			(1,405		)	89			669,735				(19,655		)	234
	Equity securities	13,152			(889		)	25			6,140				(208		)	17
	Total less than 12 months	$	238,106		$	(2,294	)	114			$	675,875			$	(19,863	)	251
	12 months or greater:
	Fixed maturity securities
	U.S. Treasuries	$	1,381		$	(15	)	1			$	—			$	—		—
	States and municipalities	22,049			(225		)	5			—				—			—
	Corporate securities	129,577			(3,194		)	41			6,174				(122		)	3
	Residential mortgage-backed securities	57,621			(1,852		)	30			5,609				(565		)	11
	Commercial mortgage-backed securities	30,813			(1,080		)	8			9,324				(900		)	3
	Asset-backed securities	14,116			(112		)	3			8,938				(101		)	3
	Total fixed maturity securities	255,557			(6,478		)	88			30,045				(1,688		)	20
	Equity securities	447			(27		)	2			303				(13		)	1
	Total 12 months or greater	$	256,004		$	(6,505	)	90			$	30,348			$	(1,701	)	21
	Total available-for-sale:
	Fixed maturity securities
	U.S. Treasuries	$	26,316		$	(61	)	7			$	22,242			$	(127	)	7
	U.S. Agencies	—			—			—			1,631				(4		)	1
	States and municipalities	27,967			(291		)	8			127,965				(4,394		)	34
	Corporate securities	261,249			(4,263		)	81			332,782				(9,658		)	115
	Residential mortgage-backed securities	92,284			(1,976		)	54			135,195				(4,735		)	69
	Commercial mortgage-backed securities	30,871			(1,081		)	9			45,202				(2,272		)	12
	Asset-backed securities	41,824			(211		)	18			34,763				(153		)	16
	Total fixed maturity securities	480,511			(7,883		)	177			699,780				(21,343		)	254
	Equity securities	13,599			(916		)	27			6,443				(221		)	18
	Total available-for-sale	$	494,110		$	(8,799	)	204			$	706,223			$	(21,564	)	272
Net realized gains and change in unrealized gains (losses), available for sale securities table	'
	ealized gains on investments and the change in unrealized gains (losses) on fixed maturity and equity securities are determined on a specific-identification basis and were as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014				2013
		(in thousands)
	Net realized gains on investments
	Fixed maturity securities
	Gross gains	$	6		$	215		$	859			$	216
	Gross losses	—			(7		)	(1		)		(7		)
	Net realized gains on fixed maturity securities	$	6		$	208		$	858			$	209
	Equity securities
	Gross gains	$	1,910		$	868		$	13,486			$	5,845
	Gross losses	(140		)	(1		)	(142		)		(319		)
	Net realized gains on equity securities	$	1,770		$	867		$	13,344			$	5,526
	Total	$	1,776		$	1,075		$	14,202			$	5,735
	Change in unrealized gains (losses)
	Fixed maturity securities	$	(9,925	)	$	(1,086	)	$	21,414			$	(76,168	)
	Equity securities	(706		)	6,401			(4,059		)		17,191
	Total	$	(10,631	)	$	5,315		$	17,355			$	(58,977	)
Investment income table	'
	Net investment income was as follows:
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014				2013
		(in thousands)
	Fixed maturity securities	$	17,848		$	17,465		$	53,349			$	51,991
	Equity securities	1,025			950			3,032				2,733
	Cash equivalents and restricted cash	15			19			48				82
		18,888			18,434			56,429				54,806
	Investment expenses	(709		)	(635		)	(1,952		)		(1,957		)
	Net investment income	$	18,179		$	17,799		$	54,477			$	52,849

Income_Taxes_Tables

Income Taxes (Tables)	9 Months Ended
	Sep. 30, 2014
Income Taxes [Abstract]	'
Reconciliation of federal staturoty income tax rates to the effective tax rates table	'
	The following is a reconciliation of the federal statutory income tax rate to the Company’s effective tax rates for the periods presented.
		Nine Months Ended
		September 30,
		2014		2013
	Expense computed at statutory rate	35	%	35	%
	Dividends received deduction and tax-exempt interest	(9.4	)	(15.0	)
	LPT deferred gain amortization	(7.7	)	(9.3	)
	LPT reserve adjustment	(8.4	)	(6.0	)
	Pre-privatization reserve adjustment, excluding LPT	(3.5	)	(10.5	)
	Other	—		1
	Effective tax rate	6	%	(4.8	)%

Liability_for_Unpaid_Losses_an1

Liability for Unpaid Losses and Loss Adjustment Expenses (Tables)	9 Months Ended
	Sep. 30, 2014
Liability for Unpaid Losses and Loss Adjustment Expenses [Abstract]	'
Changes in the liability for unpaid losses and LAE table	'
	The following table represents a reconciliation of changes in the liability for unpaid losses and LAE.
		Nine Months Ended
		September 30,
		2014		2013
		(in thousands)
	Unpaid losses and LAE, gross of reinsurance, at beginning of period	$	2,330,491	$	2,231,540
	Less reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	743,055		805,386
	Net unpaid losses and LAE at beginning of period	1,587,436		1,426,154
	Losses and LAE, net of reinsurance, related to:
	Current period	379,233		347,568
	Prior periods	3,992		1,797
	Total net losses and LAE incurred during the period	383,225		349,365
	Deduct payments for losses and LAE, net of reinsurance, related to:
	Current period	44,522		46,347
	Prior periods	246,342		203,707
	Total net payments for losses and LAE during the period	290,864		250,054
	Ending unpaid losses and LAE, net of reinsurance	1,679,797		1,525,465
	Reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	690,471		779,842
	Unpaid losses and LAE, gross of reinsurance, at end of period	$	2,370,268	$	2,305,307

Accumulated_Other_Comprehensiv1

Accumulated Other Comprehensive Income (Tables)	9 Months Ended
	Sep. 30, 2014
Accumulated Other Comprehensive Income [Abstract]	'
Schedule of accumulated other comprehensive income (loss) table	'
	The following table summarizes the components of accumulated other comprehensive income, net:
		September 30, 2014			December 31, 2013
		(in thousands)
	Net unrealized gain on investments, before taxes	$	156,460		$	139,105
	Deferred tax expense on net unrealized gains	(54,760		)	(48,687		)
	Total accumulated other comprehensive income, net	$	101,700		$	90,418

StockBased_Compensation_StockB

Stock-Based Compensation Stock-Based Compensation (Tables)	9 Months Ended
	Sep. 30, 2014
Stock-Based Compensation [Abstract]	'
Share-based compensation arrangements by share-based payment award table	'
	The Company awarded stock options, restricted stock units (RSUs) and performance share units (PSUs) to certain officers and Directors of the Company as follows:
		Number Awarded	Weighted Average Fair Value on Date of Grant		Weighted Average Exercise Price		Aggregate Fair Value on Date of Grant
							(in millions)
	Mar-14
	Stock options(1)	141,744	$	6.66	$	20.87	$	0.9
	RSUs(1)	63,878	20.87		—		1.3
	PSUs(2)	125,340	20.87		—		2.6
	May-14
	RSUs(1)	22,392	21.43		—		0.5
	-1	The stock options and RSUs awarded in March 2014 were awarded to certain officers of the Company and vest 25% on March 11, 2015, and each of the subsequent three anniversaries of that date. The stock options and RSUs are subject to accelerated vesting in certain circumstances, such as: death or disability, or in connection with change of control of the Company. The stock options expire seven years from the date of grant.
	The RSUs awarded in May 2014 were awarded to non-employee Directors of the Company and have a service vesting period of one year from the grant date.
	-2	The PSUs awarded in March 2014 were awarded to certain officers of the Company and have a performance period of three years and are subject to certain performance goals, based on the Company's statutory combined ratio, with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.

Earnings_Per_Share_Tables

Earnings Per Share (Tables)	9 Months Ended
	Sep. 30, 2014
Earnings Per Share [Abstract]	'
Net income and weighted average common shares outstanding used in earnings per share calculations table	'
	The following table presents the net income and the weighted average number of shares outstanding used in the earnings per common share calculations.
		Three Months Ended						Nine Months Ended
		September 30,						September 30,
		2014			2013			2014		2013
		(in thousands, except share data)
	Net income available to stockholders—basic and diluted	$	15,200		$	27,585		$	71,550	$	49,663
	Weighted average number of shares outstanding—basic	31,591,457			31,214,230			31,507,097		31,070,571
	Effect of dilutive securities:
	PSUs	279,550			284,217			252,532		211,347
	Stock options	202,010			457,909			230,961		382,871
	RSUs	36,403			77,320			53,538		136,581
	Dilutive potential shares	517,963			819,446			537,031		730,799
	Weighted average number of shares outstanding—diluted	32,109,420			32,033,676			32,044,128		31,801,370
Antidilutive securities excluded from computation of earnings per share table	'
	The following table presents options and RSUs that were excluded from diluted earnings per share.
		Three Months Ended					Nine Months Ended
		September 30,					September 30,
		2014		2013			2014		2013
	Options excluded as the exercise price was greater than the average market price	271,944		—			141,900		—
	Options and RSUs excluded under the treasury method as the potential proceeds on settlement or exercise price were greater than the value of shares acquired	296,867		165,504			154,044		165,504

Change_in_Estimate_Details

Change in Estimate (Details) (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013	Dec. 31, 2012
Change in Accounting Estimate [Line Items]	'	'	'	'	'	'
Unpaid losses and loss adjustment expenses	$2,370,268,000	$2,305,307,000	$2,370,268,000	$2,305,307,000	$2,330,491,000	$2,231,540,000
Amortization of deferred gain	'	'	40,100,000	22,700,000	'	'
Net income	15,200,000	27,585,000	71,550,000	49,663,000	'	'
Pre-privatization reserve adjustment, excluding LPT	'	'	-3.50%	-10.50%	'	'
Earnings Per Share [Abstract]	'	'	'	'	'	'
Basic	$0.48	$0.88	$2.27	$1.60	'	'
Diluted	$0.47	$0.86	$2.23	$1.56	'	'
Change Due to Estimated Reserves Ceded Under the LPT Agreement [Member]	'	'	'	'	'	'
Change in Accounting Estimate [Line Items]	'	'	'	'	'	'
Unpaid losses and loss adjustment expenses	33,300,000	'	33,300,000	'	'	'
Amortization of deferred gain	'	'	22,300,000	'	'	'
Net income	'	'	22,300,000	'	'	'
Earnings Per Share [Abstract]	'	'	'	'	'	'
Basic	'	'	$0.71	'	'	'
Diluted	'	'	$0.70	'	'	'
Change to Contingent Profit Commission [Member]	'	'	'	'	'	'
Change in Accounting Estimate [Line Items]	'	'	'	'	'	'
Amortization of deferred gain	'	'	7,900,000	'	'	'
Net income	'	'	7,900,000	'	'	'
Earnings Per Share [Abstract]	'	'	'	'	'	'
Basic and Diluted	'	'	$0.25	'	'	'
Due to Change in Reserves for Non-Taxable Periods [Member]	'	'	'	'	'	'
Change in Accounting Estimate [Line Items]	'	'	'	'	'	'
Unpaid losses and loss adjustment expenses	12,000,000	'	12,000,000	'	'	'
Net income	'	'	$2,700,000	'	'	'
Earnings Per Share [Abstract]	'	'	'	'	'	'
Basic	'	'	$0.09	'	'	'
Diluted	'	'	$0.08	'	'	'

Fair_Value_of_Financial_Instru2

Fair Value of Financial Instruments (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013	Sep. 30, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Investments	$2,455,266	$2,344,858	'	'
Investments, fair value	2,455,266	2,344,858	'	'
Cash and cash equivalents	59,006	34,503	99,823	140,661
Cash and cash equivalents, estimated fair value	59,006	34,503	'	'
Restricted cash and cash equivalents	20,786	6,564	'	'
Notes payable	102,000	102,000	'	'
Notes Payable, fair value	106,444	105,450	'	'
Estimate of Fair Value, Fair Value Disclosure [Member]	'	'	'	'
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]	'	'	'	'
Investments	31,100	32,200	'	'
Restricted cash and cash equivalents	$20,786	$6,564	'	'

Fair_Value_of_Financial_Instru3

Fair Value of Financial Instruments, Fair Value Inputs (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	$2,455,266	$2,344,858
Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	2,290,718	2,182,546
Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	2,290,718	2,182,546
Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US Treasury Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	171,295	170,897
US Treasury Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US Treasury Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	170,897
US Treasury Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US Government Agencies Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	48,795	68,118
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	68,118
US Government Agencies Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US States and Political Subdivisions Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	749,523	735,180
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	735,180
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Corporate Debt Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	911,271	833,296
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	833,296
Corporate Debt Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Residential Mortgage Backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	288,144	258,431
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	258,431
Residential Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Commercial Mortgage Backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	61,564	65,110
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	65,110
Commercial Mortgage Backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Asset-backed Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	60,126	51,514
Asset-backed Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Asset-backed Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	51,514
Asset-backed Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Equity Securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	164,548	162,312
Equity Securities [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	'	162,312
Equity Securities [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	0	0
Equity Securities [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Investments	$0	$0

Investments_Details

Investments (Details) (USD $)	9 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Dec. 31, 2013
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	$2,298,806	$2,205,753
Gross unrealized gains	165,259	160,669
Gross unrealized losses	-8,799	-21,564
Investments	2,455,266	2,344,858
Deposit Assets	'	'
Investments	2,455,266	2,344,858
Assets Held-in-trust	'	'
Investments	2,455,266	2,344,858
Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	2,202,822	2,116,064
Gross unrealized gains	95,779	87,825
Gross unrealized losses	-7,883	-21,343
Investments	2,290,718	2,182,546
Deposit Assets	'	'
Investments	2,290,718	2,182,546
Assets Held-in-trust	'	'
Investments	2,290,718	2,182,546
US Treasury Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	165,159	163,951
Gross unrealized gains	6,197	7,073
Gross unrealized losses	-61	-127
Investments	171,295	170,897
Deposit Assets	'	'
Investments	171,295	170,897
Assets Held-in-trust	'	'
Investments	171,295	170,897
US Government Agencies Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	46,268	64,985
Gross unrealized gains	2,527	3,137
Gross unrealized losses	0	-4
Investments	48,795	68,118
Deposit Assets	'	'
Investments	48,795	68,118
Assets Held-in-trust	'	'
Investments	48,795	68,118
US States and Political Subdivisions Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	703,112	698,979
Gross unrealized gains	46,702	40,595
Gross unrealized losses	-291	-4,394
Investments	749,523	735,180
Deposit Assets	'	'
Investments	749,523	735,180
Assets Held-in-trust	'	'
Investments	749,523	735,180
Corporate Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	884,551	814,283
Gross unrealized gains	30,983	28,671
Gross unrealized losses	-4,263	-9,658
Investments	911,271	833,296
Deposit Assets	'	'
Investments	911,271	833,296
Assets Held-in-trust	'	'
Investments	911,271	833,296
Residential Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	281,125	255,187
Gross unrealized gains	8,995	7,979
Gross unrealized losses	-1,976	-4,735
Investments	288,144	258,431
Deposit Assets	'	'
Investments	288,144	258,431
Assets Held-in-trust	'	'
Investments	288,144	258,431
Commercial Mortgage Backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	62,297	67,066
Gross unrealized gains	348	316
Gross unrealized losses	-1,081	-2,272
Investments	61,564	65,110
Deposit Assets	'	'
Investments	61,564	65,110
Assets Held-in-trust	'	'
Investments	61,564	65,110
Asset-backed Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	60,310	51,613
Gross unrealized gains	27	54
Gross unrealized losses	-211	-153
Investments	60,126	51,514
Deposit Assets	'	'
Investments	60,126	51,514
Assets Held-in-trust	'	'
Investments	60,126	51,514
Equity Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Amortized cost	95,984	89,689
Gross unrealized gains	69,480	72,844
Gross unrealized losses	-916	-221
Investments	164,548	162,312
Deposit Assets	'	'
Investments	164,548	162,312
Assets Held-in-trust	'	'
Investments	164,548	162,312
Fair Value Measurement [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Investments	31,100	32,200
Deposit Assets	'	'
Investments	31,100	32,200
Assets Held-in-trust	'	'
Investments	31,100	32,200
Fair Value Measurement [Member] | Debt Securities [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Investments	782,700	602,400
Deposit Assets	'	'
Investments	782,700	602,400
Assets Held-in-trust	'	'
Investments	782,700	602,400
Fair Value Measurement [Member] | Fixed Maturities and Restricted Cash Equivalents [Member]	'	'
Schedule of Available-for-sale Securities [Line Items]	'	'
Investments	85,100	95,100
Deposit Assets	'	'
Investments	85,100	95,100
Assets Held-in-trust	'	'
Investments	$85,100	$95,100

Investments_Amortized_Cost_and

Investments, Amortized Cost and Estimated Fair Value (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Amortized Cost	'	'
Due in one year or less, amortized cost	$167,908	'
Due after one year through five years, amortized cost	799,473	'
Due after five years through ten years, amortized cost	668,703	'
Due after ten years, amortized cost	163,006	'
Mortgage and asset-backed securities, amortized cost	403,732	'
Total, amortized cost	2,202,822	'
Estimated Fair Value	'	'
Due in one year or less, fair value	169,932	'
Due after one year through five years, fair value	836,312	'
Due after five years through ten years, fair value	695,413	'
Due after ten years, fair value	179,227	'
Mortgage and asset-backed securities, fair value	409,834	'
Total, fair value	$2,290,718	$2,182,546

Investments_Continuous_Loss_Po

Investments, Continuous Loss Position (Details) (USD $)	9 Months Ended	12 Months Ended
	Sep. 30, 2014	Dec. 31, 2013
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	$238,106,000	$675,875,000
Estimated fair value, 12 months or greater	256,004,000	30,348,000
Estimated fair value, total	494,110,000	706,223,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-2,294,000	-19,863,000
Gross unrealized losses, 12 months or greater	-6,505,000	-1,701,000
Estimated unrealized losses, total	-8,799,000	-21,564,000
Number of issues in loss position, less than 12 months	114	251
Number of Issues in loss position, 12 months or greater	90	21
Number of issues loss position, aggregate	204	272
Total impairments, value	100,000	'
Total impairments, number of securities	4	'
Debt Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	224,954,000	669,735,000
Estimated fair value, 12 months or greater	255,557,000	30,045,000
Estimated fair value, total	480,511,000	699,780,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-1,405,000	-19,655,000
Gross unrealized losses, 12 months or greater	-6,478,000	-1,688,000
Estimated unrealized losses, total	-7,883,000	-21,343,000
Number of issues in loss position, less than 12 months	89	234
Number of Issues in loss position, 12 months or greater	88	20
Number of issues loss position, aggregate	177	254
US Treasury Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	24,935,000	22,242,000
Estimated fair value, 12 months or greater	1,381,000	0
Estimated fair value, total	26,316,000	22,242,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-46,000	-127,000
Gross unrealized losses, 12 months or greater	-15,000	0
Estimated unrealized losses, total	-61,000	-127,000
Number of issues in loss position, less than 12 months	6	7
Number of Issues in loss position, 12 months or greater	1	0
Number of issues loss position, aggregate	7	7
US Government Agencies Debt Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	0	1,631,000
Estimated fair value, total	0	1,631,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	0	-4,000
Estimated unrealized losses, total	0	-4,000
Number of issues in loss position, less than 12 months	0	1
Number of issues loss position, aggregate	0	1
US States and Political Subdivisions Debt Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	5,918,000	127,965,000
Estimated fair value, 12 months or greater	22,049,000	0
Estimated fair value, total	27,967,000	127,965,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-66,000	-4,394,000
Gross unrealized losses, 12 months or greater	-225,000	0
Estimated unrealized losses, total	-291,000	-4,394,000
Number of issues in loss position, less than 12 months	3	34
Number of Issues in loss position, 12 months or greater	5	0
Number of issues loss position, aggregate	8	34
Corporate Debt Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	131,672,000	326,608,000
Estimated fair value, 12 months or greater	129,577,000	6,174,000
Estimated fair value, total	261,249,000	332,782,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-1,069,000	-9,536,000
Gross unrealized losses, 12 months or greater	-3,194,000	-122,000
Estimated unrealized losses, total	-4,263,000	-9,658,000
Number of issues in loss position, less than 12 months	40	112
Number of Issues in loss position, 12 months or greater	41	3
Number of issues loss position, aggregate	81	115
Residential Mortgage Backed Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	34,663,000	129,586,000
Estimated fair value, 12 months or greater	57,621,000	5,609,000
Estimated fair value, total	92,284,000	135,195,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-124,000	-4,170,000
Gross unrealized losses, 12 months or greater	-1,852,000	-565,000
Estimated unrealized losses, total	-1,976,000	-4,735,000
Number of issues in loss position, less than 12 months	24	58
Number of Issues in loss position, 12 months or greater	30	11
Number of issues loss position, aggregate	54	69
Commercial Mortgage Backed Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	58,000	35,878,000
Estimated fair value, 12 months or greater	30,813,000	9,324,000
Estimated fair value, total	30,871,000	45,202,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-1,000	-1,372,000
Gross unrealized losses, 12 months or greater	-1,080,000	-900,000
Estimated unrealized losses, total	-1,081,000	-2,272,000
Number of issues in loss position, less than 12 months	1	9
Number of Issues in loss position, 12 months or greater	8	3
Number of issues loss position, aggregate	9	12
Asset-backed Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	27,708,000	25,825,000
Estimated fair value, 12 months or greater	14,116,000	8,938,000
Estimated fair value, total	41,824,000	34,763,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-99,000	-52,000
Gross unrealized losses, 12 months or greater	-112,000	-101,000
Estimated unrealized losses, total	-211,000	-153,000
Number of issues in loss position, less than 12 months	0	0
Number of Issues in loss position, 12 months or greater	3	3
Number of issues loss position, aggregate	0	0
Equity Securities [Member]	'	'
Estimated Fair Value	'	'
Estimated fair value, less than 12 months	13,152,000	6,140,000
Estimated fair value, 12 months or greater	447,000	303,000
Estimated fair value, total	13,599,000	6,443,000
Gross Unrealized Losses	'	'
Gross unrealized losses, less than 12 months	-889,000	-208,000
Gross unrealized losses, 12 months or greater	-27,000	-13,000
Estimated unrealized losses, total	-916,000	-221,000
Number of issues in loss position, less than 12 months	25	17
Number of Issues in loss position, 12 months or greater	2	1
Number of issues loss position, aggregate	$27	$18

Investments_Net_Realized_Gains

Investments, Net Realized Gains (Losses) (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Net realized gains (losses)	'	'	'	'
Net realized gains (losses) on fixed maturity and equity securities	$1,776	$1,075	$14,202	$5,735
Change in unrealized gains (losses)	'	'	'	'
Change in unrealized gains (losses) on fixed maturity and equity securities	-10,631	5,315	17,355	-58,977
Debt Securities [Member]	'	'	'	'
Net realized gains (losses)	'	'	'	'
Gross gains from sales	6	215	859	216
Gross losses from sales	0	7	1	7
Net realized gains (losses) on fixed maturity and equity securities	6	208	858	209
Change in unrealized gains (losses)	'	'	'	'
Change in unrealized gains (losses) on fixed maturity and equity securities	-9,925	-1,086	21,414	-76,168
Equity Securities [Member]	'	'	'	'
Net realized gains (losses)	'	'	'	'
Gross gains from sales	1,910	868	13,486	5,845
Gross losses from sales	140	1	142	319
Net realized gains (losses) on fixed maturity and equity securities	1,770	867	13,344	5,526
Change in unrealized gains (losses)	'	'	'	'
Change in unrealized gains (losses) on fixed maturity and equity securities	($706)	$6,401	($4,059)	$17,191

Net_Investment_Income_Details

Net Investment Income (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income	$18,888	$18,434	$56,429	$54,806
Investment expenses	709	635	1,952	1,957
Net investment income	18,179	17,799	54,477	52,849
Debt Securities [Member]	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income related to fixed maturity securities and short-term investments and cash equivalents	17,848	17,465	53,349	51,991
Equity Securities [Member]	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income related to equity securities	1,025	950	3,032	2,733
Short-term Investments [Member]	'	'	'	'
Schedule of Investment Income, Reported Amounts, by Category [Line Items]	'	'	'	'
Investment income related to fixed maturity securities and short-term investments and cash equivalents	$15	$19	$48	$82

Income_Taxes_Details

Income Taxes (Details)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013
Effective Income Tax Rate, Continuing Operations, Tax Rate Reconciliation [Abstract]	'	'
Expense computed at statutory rate	35.00%	35.00%
Dividends received deduction and tax-exempt interest	-9.40%	-15.00%
LPT deferred gain amortization	-7.70%	-9.30%
LPT reserve adjustment	-8.40%	-6.00%
Pre-privatization reserve adjustment, excluding LPT	-3.50%	-10.50%
Other	0.00%	1.00%
Effective tax rate	6.00%	-4.80%

Liability_for_Unpaid_Losses_an2

Liability for Unpaid Losses and Loss Adjustment Expenses (Details) (USD $)	9 Months Ended
In Thousands, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]	'	'
Unpaid losses and LAE, gross of reinsurance, at beginning of period	$2,330,491	$2,231,540
Less reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	743,055	805,386
Net unpaid losses and LAE at beginning of period	1,587,436	1,426,154
Losses and LAE, net of reinsurance, related to:	'	'
Current period	379,233	347,568
Prior periods	3,992	1,797
Total net losses and LAE incurred during the period	383,225	349,365
Deduct payments for losses and LAE, net of reinsurance, related to:	'	'
Current period	44,522	46,347
Prior periods	246,342	203,707
Total net payments for losses and LAE during the period	290,864	250,054
Ending unpaid losses and LAE, net of reinsurance	1,679,797	1,525,465
Reinsurance recoverable, excluding bad debt allowance, on unpaid losses and LAE	690,471	779,842
Unpaid losses and LAE, gross of reinsurance, at end of period	$2,370,268	$2,305,307

LPT_Agreement_LPT_Agreement_De

LPT Agreement LPT Agreement (Details) (USD $)	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Reinsurance Agreement [Line Items]	'	'	'
Reinsurance quota share, percentage	100.00%	'	'
Liabilities for the incurred but unpaid losses and LAE related to claims prior to July 1, 1995	$1,500,000,000	'	'
Ceded premiums written	775,000,000	'	'
Amortization of deferred gain	40,100,000	22,700,000	'
Deferred reinsurance gain—LPT Agreement	218,654,000	'	249,072,000
Estimated remaining liabilities - LPT Agreement	555,800,000	'	612,100,000
Paid losses and LAE claims related to LPT	660,800,000	'	637,900,000
Indemnification Agreement [Member]	'	'	'
Reinsurance Agreement [Line Items]	'	'	'
Coverage provided under LPT Agreement	$2,000,000,000	'	'

Accumulated_Other_Comprehensiv2

Accumulated Other Comprehensive Income (Details) (USD $)	Sep. 30, 2014	Dec. 31, 2013
In Thousands, unless otherwise specified
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]	'	'
Net unrealized gain on investments, before taxes	$156,460	$139,105
Deferred tax expense on net unrealized gains	-54,760	-48,687
Total accumulated other comprehensive income, net	$101,700	$90,418

StockBased_Compensation_Detail

Stock-Based Compensation (Details) (USD $)

9 Months Ended

12 Months Ended

3 Months Ended

1 Months Ended

3 Months Ended

In Millions, except Share data, unless otherwise specified

Sep. 30, 2014

Dec. 31, 2013

Jun. 30, 2014

Mar. 31, 2014

Mar. 31, 2014

31-May-14

Mar. 31, 2014

Mar. 31, 2014

Officer [Member]

Officer [Member]

Stock Option [Member]

Restricted Stock Units (RSUs) [Member]

Restricted Stock Units (RSUs) [Member]

Performance Shares [Member]

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

'

'

'

'

'

'

'

'

Share-based compensation award, shares issued

'

'

'

'

141,744

[1]

22,392

[1]

63,878

[1]

125,340

[2]

Share-based compensation options, exercise price on grant date

'

'

'

'

$6.66

[1]

$21.43

[1]

$20.87

[2]

$20.87

[2]

Share-based compensation award, fair value assumptions, exercise price

'

'

'

'

$20.87

[1]

$0

$0

$0

Fair value of awards awarded on grant date

'

'

'

'

$0.90

[1]

$0.50

[1]

$1.30

[1]

$2.60

[2]

Vesting rights for options awarded

'

'

'vesting period of one year from the grant date

'vest 25% on March 11, 2015, and each of the subsequent three anniversaries of that date

'

'

'

'

Expiration Period for Options Awarded

'

'

'

'seven years

'

'

'

'

Performance share awards performance period

'

'

'

'three years

'

'

'

'

Performance share awards, minimum payout

'

'

'

0.00%

'

'

'

'

Performane share awards, maximum payout

'

'

'

200.00%

'

'

'

'

Stock-options exercised

116,134

411,295

'

'

'

'

'

'

[1]

The stock options and RSUs awarded in March 2014 were awarded to certain officers of the Company and vest 25% on March 11, 2015, and each of the subsequent three anniversaries of that date. The stock options and RSUs are subject to accelerated vesting in certain circumstances, such as: death or disability, or in connection with change of control of the Company. The stock options expire seven years from the date of grant.The RSUs awarded in May 2014 were awarded to non-employee Directors of the Company and have a service vesting period of one year from the grant date.(2)

[2]

The PSUs awarded in March 2014 were awarded to certain officers of the Company and have a performance period of three years and are subject to certain performance goals, based on the Company's statutory combined ratio, with payouts that range from 0% to 200% of the target awards. The value shown in the table represents the aggregate number of PSUs awarded at the target level.

Earnings_Per_Share_Details

Earnings Per Share (Details) (USD $)	3 Months Ended		9 Months Ended
In Thousands, except Share data, unless otherwise specified	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Earnings Per Share, Basic and Diluted, by Common Class [Line Items]	'	'	'	'
Net income available to stockholders - basic and diluted	$15,200	$27,585	$71,550	$49,663
Weighted average number of shares outstanding - basic	31,591,457	31,214,230	31,507,097	31,070,571
Effect of dilutive securities:	'	'	'	'
Dilutive securities	517,963	819,446	537,031	730,799
Weighted average number of shares outstanding - diluted	32,109,420	32,033,676	32,044,128	31,801,370
Antidilutive securities excluded from computation of earnings per share	271,944	0	141,900	0
Antidilutive securites excluded under the treasury method from computation of earnings per share	296,867	165,504	154,044	165,504
Employee Stock Option [Member]	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Dilutive securities	202,010	457,909	230,961	382,871
Restricted Stock Units (RSUs) [Member]	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Dilutive securities	36,403	77,320	53,538	136,581
Performance Shares [Member]	'	'	'	'
Effect of dilutive securities:	'	'	'	'
Dilutive securities	279,550	284,217	252,532	211,347