Mercury General (MCY) 10-Q 1 Aug 17 2017 Q2 Quarterly report Financial data

Document And Entity Information

Document And Entity Information - shares	6 Months Ended
	Jun. 30, 2017	Jul. 27, 2017
Document And Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Jun. 30, 2017
Document Fiscal Year Focus	2,017
Document Fiscal Period Focus	Q2
Entity Registrant Name	MERCURY GENERAL CORP
Entity Central Index Key	64,996
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		55,311,077

Consolidated Balance Sheets

Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Fixed maturity securities (amortized cost $2,897,032; $2,795,410)	$ 2,952,084	$ 2,814,553
Equity securities (cost $395,011; $331,770)	427,029	357,327
Short-term investments (cost $280,304; $375,700)	280,045	375,680
Total investments	3,659,158	3,547,560
Cash	261,425	220,318
Receivables:
Premium	469,081	459,152
Accrued investment income	44,334	41,205
Other	18,961	24,635
Total receivables	532,376	524,992
Deferred policy acquisition costs	199,070	200,826
Fixed assets (net of accumulated depreciation $330,219; $319,429)	155,264	155,910
Deferred income taxes	34,347	45,277
Goodwill	42,796	42,796
Other intangible assets, net	22,949	25,625
Other assets	31,598	25,414
Total assets	4,938,983	4,788,718
Liabilities
Loss and loss adjustment expense reserves	1,326,963	1,290,248
Unearned premiums	1,093,594	1,074,437
Notes payable	371,136	320,000
Accounts payable and accrued expenses	121,195	112,334
Current income taxes	12,706	9,962
Other liabilities	250,197	229,335
Total liabilities	3,175,791	3,036,316
Commitments and contingencies
Shareholders’ equity:
Common stock without par value or stated value: Authorized 70,000 shares; issued and outstanding 55,311; 55,289	96,565	95,529
Retained earnings	1,666,627	1,656,873
Total shareholders’ equity	1,763,192	1,752,402
Total liabilities and shareholders’ equity	$ 4,938,983	$ 4,788,718

Consolidated Balance Sheets (Pa

Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Thousands, $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Statement of Financial Position [Abstract]
Amortized cost on fixed maturities trading investments	$ 2,897,032	$ 2,795,410
Cost - equity security trading investments	395,011	331,770
Cost - short-term investments	280,304	375,700
Fixed assets, accumulated depreciation	$ 330,219	$ 319,429
Common Stock
Common stock, no par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	70,000	70,000
Common stock, shares issued (in shares)	55,311	55,289
Common stock, shares outstanding (in shares)	55,311	55,289

Consolidated Statements Of Oper

Consolidated Statements Of Operations (Unaudited) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Revenues:
Net premiums earned	$ 797,666	$ 779,321	$ 1,587,436	$ 1,546,406
Net investment income	31,901	31,414	63,070	61,069
Net realized investment gains	21,156	45,381	45,616	70,438
Other	2,124	1,887	4,229	4,010
Total revenues	852,847	858,003	1,700,351	1,681,923
Expenses:
Losses and loss adjustment expenses	588,595	595,086	1,195,260	1,189,168
Policy acquisition costs	137,839	139,922	280,438	281,482
Other operating expenses	53,432	57,700	118,620	118,994
Interest	4,229	960	6,682	1,910
Total expenses	784,095	793,668	1,601,000	1,591,554
Income before income taxes	68,752	64,335	99,351	90,369
Income tax expense	17,119	15,462	20,738	18,173
Net income	$ 51,633	$ 48,873	$ 78,613	$ 72,196
Net income per share:
Basic (in dollars per share)	$ 0.93	$ 0.88	$ 1.42	$ 1.31
Diluted (in dollars per share)	$ 0.93	$ 0.88	$ 1.42	$ 1.31
Weighted average shares outstanding:
Basic (in shares)	55,311	55,254	55,304	55,227
Diluted (in shares)	55,323	55,322	55,318	55,294
Dividends paid per share (in dollars per share)	$ 0.6225	$ 0.62000	$ 1.245	$ 1.24

Consolidated Statements Of Cash

Consolidated Statements Of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES
Net income	$ 78,613	$ 72,196
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	27,525	25,918
Net realized investment gains	(45,616)	(70,438)
Increase in premiums receivable	(9,929)	(23,456)
Changes in current and deferred income taxes	13,674	17,871
Decrease (increase) in deferred policy acquisition costs	1,756	(2,231)
Increase in loss and loss adjustment expense reserves	36,715	64,104
Increase in unearned premiums	19,157	30,824
Increase (decrease) in accounts payable and accrued expenses	9,068	(6,166)
Share-based compensation	56	71
Other, net	43,726	(2,901)
Net cash provided by operating activities	174,745	105,792
CASH FLOWS FROM INVESTING ACTIVITIES
Fixed maturities available-for-sale in nature: Purchases	(440,294)	(491,231)
Fixed maturities available-for-sale in nature: Sales	65,211	172,490
Fixed maturities available-for-sale in nature: Calls or maturities	258,782	288,257
Equity securities available for sale in nature:
Equity securities available for sale in nature: Purchases	(368,896)	(337,598)
Equity securities available for sale in nature: Sales	303,574	310,369
Equity securities available for sale in nature: Calls	7,100	0
Changes in securities payable and receivable	(29,674)	(2,388)
Net decrease in short-term investments and purchased options	97,790	1,677
Purchase of fixed assets	(10,557)	(8,935)
Sale of fixed assets	0	2
Other, net	3	2,343
Net cash used in investing activities	(116,961)	(65,014)
CASH FLOWS FROM FINANCING ACTIVITIES
Dividends paid to shareholders	(68,859)	(68,515)
Employee taxes paid for withheld shares related to share-based compensation	0	(3,203)
Proceeds from stock options exercised	1,171	0
Net proceeds from issuance of senior notes	371,011	0
Payoff of principal on loan and credit facilities	(320,000)	0
Net cash used in financing activities	(16,677)	(71,718)
Net increase (decrease) in cash	41,107	(30,940)
Cash:
Beginning of the year	220,318	264,221
End of period	261,425	233,281
SUPPLEMENTAL CASH FLOW DISCLOSURE
Interest paid	1,292	1,820
Income taxes paid	$ 7,063	$ 273

General

General	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	General Consolidation and Basis of Presentation The interim consolidated financial statements include the accounts of Mercury General Corporation and its subsidiaries (referred to herein collectively as the “Company”). For the list of the Company’s subsidiaries, see Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . These interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), which differ in some respects from those filed in reports to insurance regulatory authorities. The financial data of the Company included herein are unaudited. In the opinion of management, all material adjustments of a normal recurring nature have been made to present fairly the Company’s financial position at June 30, 2017 and the results of operations and cash flows for the periods presented. All intercompany transactions and balances have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been omitted from the accompanying interim consolidated financial statements and related notes. Readers are urged to review the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 for more complete descriptions and discussions. Operating results and cash flows for the six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 . Certain prior period amounts have been reclassified to conform to the current period presentation. Use of Estimates The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. These estimates require the Company to apply complex assumptions and judgments, and often the Company must make estimates about the effects of matters that are inherently uncertain and will likely change in subsequent periods. The most significant assumptions in the preparation of these consolidated financial statements relate to reserves for losses and loss adjustment expenses. Actual results could differ from those estimates. See Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . Earnings per Share Potentially dilutive securities representing approximately 28,000 and 48,000 shares of common stock for the three and six months ended June 30, 2016 , respectively, were excluded from the computation of diluted earnings per common share because their effect would have been anti-dilutive. There were no potentially dilutive securities with anti-dilutive effect for the three and six months ended June 30, 2017 . Deferred Policy Acquisition Costs Deferred policy acquisition costs consist of commissions paid to outside agents, premium taxes, salaries, and certain other underwriting costs that are incremental or directly related to the successful acquisition of new and renewal insurance contracts and are amortized over the life of the related policy in proportion to premiums earned. Deferred policy acquisition costs are limited to the amount that will remain after deducting from unearned premiums and anticipated investment income, the estimated losses and loss adjustment expenses, and the servicing costs that will be incurred as premiums are earned. The Company’s deferred policy acquisition costs are further limited by excluding those costs not directly related to the successful acquisition of insurance contracts. Deferred policy acquisition cost amortization was $137.8 million and $139.9 million for the three months ended June 30, 2017 and 2016 , respectively, and $280.4 million and $281.5 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not defer advertising expenditures but expenses them as incurred. The Company recorded net advertising expense of approximately $20 million and $24 million for the six months ended June 30, 2017 and 2016 , respectively.

Recently Issued Accounting Stan

Recently Issued Accounting Standards	6 Months Ended
	Jun. 30, 2017
New Accounting Pronouncements and Changes in Accounting Principles [Abstract]
Recently Issued Accounting Standards	Recently Issued Accounting Standards In May 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-09, " Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting. " ASU 2017-09 provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 will be effective for the Company beginning January 1, 2018 with early adoption permitted. The Company does not anticipate that ASU 2017-09 will have a material impact on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, " Intangibles - Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment. " ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of Step 2 of the goodwill impairment test and requires an entity to recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective for the Company beginning January 1, 2020 with early adoption permitted. The Company does not anticipate that ASU 2017-04 will have a material impact on its consolidated financial statements and related disclosures. In October 2016, the FASB issued ASU 2016-16, " Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory. " ASU 2016-16 requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. ASU 2016-16 will be effective for the Company beginning January 1, 2018. The Company is evaluating the impact that ASU 2016-16 will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments (Topic 230). " The new guidance is intended to reduce diversity in how certain transactions are classified in the consolidated statement of cash flows. ASU 2016-15 will be effective for the Company beginning January 1, 2018. The Company is evaluating the impact that ASU 2016-15 will have on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326). " The amendments in this ASU replace the "incurred loss" methodology for recognizing credit losses with a methodology that reflects expected credit losses and requires consideration of a broader range of information including past events, current conditions and reasonable and supportable forecasts that affect the collectibility of reported amounts of financial assets that are not accounted for at fair value through net income, such as loans, certain debt securities, trade receivables, net investment in leases, off-balance sheet credit exposures and reinsurance receivables. Under the current GAAP incurred loss methodology, recognition of the full amount of credit losses is generally delayed until the loss is probable of occurring. Current GAAP restricts the ability to record credit losses that are expected, but do not yet meet the probability threshold. ASU 2016-13 will be effective for the Company beginning with the first quarter ending March 31, 2020. While the Company is in the process of evaluating the impact of ASU 2016-13, it does not expect this ASU to have a material impact on its consolidated financial statements and related disclosures as most of its financial instruments with potential exposure to material credit losses are accounted for at fair value through net income. In March 2016, the FASB issued ASU 2016-09, " Compensation - Stock Compensation (Topic 718) ," which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted ASU 2016-09 for the quarter ended March 31, 2017. As a result of the adoption, the Company recognizes excess tax benefits in its provision for income taxes rather than paid-in capital. Additional amendments to accounting for income taxes and minimum statutory withholding tax requirements had no impact to retained earnings as of January 1, 2017, where the cumulative effect of these changes are required to be recorded. The Company elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized in each period. The Company also elected to apply the presentation requirements for cash flows related excess tax benefits retrospectively to all periods presented, which resulted in an increase to both net cash provided by operating activities and net cash used in financing activities of approximately $904,000 for the six months ended June 30, 2016. The adoption of the presentation requirements for cash flows related to employee taxes paid for withheld shares resulted in an increase to both net cash provided by operating activities and net cash used in financing activities of approximately $3,200,000 for the six months ended June 30, 2016. In February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) ," which supersedes the guidance in Accounting Standards Codification ("ASC") 840, "Leases." ASU 2016-02 requires a lessee to recognize lease assets and lease liabilities resulting from all leases. ASU 2016-02 retains the distinction between a finance lease and an operating lease. Lessor accounting is largely unchanged from ASC 840. ASU 2016-02 will be effective for the Company beginning January 1, 2019. However, in transition, the Company will be required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. While the Company is in the process of evaluating the impact of ASU 2016-02, it does not expect this ASU to have a material impact on its consolidated financial statements, except for recognizing lease assets and lease liabilities for its operating leases. The Company's lease obligations under various non-cancellable operating lease agreements amounted to approximately $27,000,000 at December 31, 2016. In January 2016, the FASB issued ASU 2016-01, " Financial Instruments-Overall (Subtopic 825-10) , Recognition and Measurement of Financial Assets and Financial Liabilities. " The amendments in this ASU address certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01: (1) requires equity investments (except those accounted for under the equity method or those that result in the consolidation of the investee) to be measured at fair value with changes in the fair value recognized in net income; (2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (3) eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (4) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (5) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the notes to the financial statements; and (6) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU 2016-01 will be effective for the Company beginning January 1, 2018. The Company does not anticipate that ASU 2016-01 will have a material impact on its consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU 2014-09, " Revenue from Contracts with Customers (Topic 606). " ASU 2014-09 requires entities to apply a five-step model to determine the amount and timing of revenue recognition. The model specifies, among other criteria, that revenue should be recognized when an entity transfers control of goods or services to a customer in the amount to which the entity expects to be entitled. In August 2015, the FASB issued ASU 2015-14, " Revenue from Contracts with Customers (Topic 606), Deferral of the Effective Date ," which deferred the effective date of ASU 2014-09 for the Company to January 1, 2018. Subsequently, the FASB has issued additional ASUs on Topic 606 that do not change the core principle of the guidance in ASU 2014-09 but merely clarify certain aspects of it. The additional ASUs will also be effective for the Company beginning January 1, 2018. Two methods of transition are permitted upon adoption: full retrospective and modified retrospective. The Company is evaluating both methods of transition and it is currently anticipated that a modified retrospective adoption approach will be used. However, as the accounting for insurance contracts is outside of the scope of ASU 2014-09, the Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements and related disclosures.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	6 Months Ended
	Jun. 30, 2017
Financial Instruments, Owned, at Fair Value [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments The financial instruments recorded in the consolidated balance sheets include investments, receivables, options sold, total return swaps, accounts payable, and secured and unsecured notes payable. Due to their short-term maturities, the carrying values of receivables and accounts payable approximate their fair values. All investments are carried at fair value in the consolidated balance sheets. The following table presents the estimated fair values of financial instruments: June 30, 2017 December 31, 2016 (Amounts in thousands) Assets Investments $ 3,659,158 $ 3,547,560 Total return swaps — 667 Liabilities Total return swaps $ 1,725 $ 765 Options sold 104 20 Secured notes — 140,000 Unsecured notes 380,059 180,000 Investments The Company applies the fair value option to all fixed maturity and equity securities and short-term investments at the time an eligible item is first recognized. The cost of investments sold is determined on a first-in and first-out method and realized gains and losses are included in net realized investment gains i n the consolidated statements of operations . See Note 4. Fair Value Option for additional information. Options Sold The Company writes covered call options through listed and over-the-counter exchanges. When the Company writes an option, an amount equal to the premium received by the Company is recorded as a liability and is subsequently adjusted to the current fair value of the option written. Premiums received from writing options that expire unexercised are treated by the Company as realized gains from investments on the expiration date. If a call option is exercised, the premium is added to the proceeds from the sale of the underlying security or currency in determining whether the Company has realized a gain or loss. The Company, as writer of an option, bears the market risk of an unfavorable change in the price of the security underlying the written option. Liabilities for covered call options are included in other liabilities in the Company's consolidated balance sheets. Total Return Swaps The fair values of the total return swaps reflect the estimated amounts that, upon termination of the contracts, would be received for selling an asset or paid to transfer a liability in an orderly transaction. Secured Notes The fair values of the Company’s $120 million secured note and $20 million secured note at December 31, 2016 approximate their carrying values. Unsecured Notes The fair value of the Company’s publicly traded $375 million unsecured note at June 30, 2017 was obtained from a third party pricing service. The fair value of the Company's $180 million unsecured note at December 31, 2016 approximates its carrying value. For additional disclosures regarding methods and assumptions used in estimating fair values, see Note 5. Fair Value Measurements.

Fair Value Option

Fair Value Option	6 Months Ended
	Jun. 30, 2017
Fair Value Option [Abstract]
Fair Value Option	Fair Value Option The Company applies the fair value option to all fixed maturity and equity investment securities and short-term investments at the time an eligible item is first recognized. The primary reasons for electing the fair value option were simplification and cost-benefit considerations as well as the expansion of the use of fair value measurement by the Company consistent with the long-term measurement objectives of the FASB for accounting for financial instruments. Gains or losses due to changes in fair value for items measured at fair value pursuant to application of the fair value option are included in net realized investment gains or losses in the Company’s consolidated statements of operations, while interest and dividend income on investment holdings are recognized on an accrual basis at each measurement date and are included in net investment income in the Company’s consolidated statements of operations. The following table presents gains (losses) due to changes in fair value of investments that are measured at fair value pursuant to the application of the fair value option: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Fixed maturity securities $ 25,622 $ 28,871 $ 35,909 $ 40,434 Equity securities (5,080 ) 8,666 6,462 15,573 Short-term investments (267 ) (410 ) (240 ) (349 ) Total gains $ 20,275 $ 37,127 $ 42,131 $ 55,658

Fair Value Measurement

Fair Value Measurement	6 Months Ended
	Jun. 30, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Fair Value Measurement	Fair Value Measurements The Company employs a fair value hierarchy that prioritizes the inputs to valuation techniques used to measure fair value. The fair value of a financial instrument is the amount 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 using the exit price. Accordingly, when market observable data are not readily available, the Company’s own assumptions are used to reflect those that market participants would be presumed to use in pricing the asset or liability at the measurement date. Assets and liabilities recorded at fair value on the consolidated balance sheets are categorized based on the level of judgment associated with inputs used to measure their fair values and the level of market price observability, as follows: Level 1 Unadjusted quoted prices are available in active markets for identical assets or liabilities as of the reporting date. Level 2 Pricing inputs are other than quoted prices in active markets, which are based on the following: • Quoted prices for similar assets or liabilities in active markets; • Quoted prices for identical or similar assets or liabilities in non-active markets; or • Either directly or indirectly observable inputs as of the reporting date. Level 3 Pricing inputs are unobservable and significant to the overall fair value measurement, and the determination of fair value requires significant management judgment or estimation. In certain cases, inputs used to measure fair value may fall into different levels of the fair value hierarchy. In such cases, the level in the fair value hierarchy within which the fair value measurement in its entirety falls has been determined based on the lowest level input that is significant to the fair value measurement in its entirety. Thus, a Level 3 fair value measurement may include inputs that are observable (Level 1 or Level 2) and unobservable (Level 3). The Company’s assessment of the significance of a particular input to the fair value measurement in its entirety requires judgment and consideration of factors specific to the asset or liability. The Company uses prices and inputs that are current as of the measurement date, including during periods of market disruption. In periods of market disruption, the ability to observe prices and inputs may be reduced for many instruments. This condition could cause an instrument to be reclassified from Level 1 to Level 2, or from Level 2 to Level 3. The Company recognizes transfers between levels at either the actual date of the event or a change in circumstances that caused the transfer. Summary of Significant Valuation Techniques for Financial Assets and Financial Liabilities The Company’s fair value measurements are based on the market approach, which utilizes market transaction data for the same or similar instruments. The Company obtained unadjusted fair values on 99.8% of its portfolio from an independent pricing service. For 0.2% of its portfolio, classified as Level 3, the Company obtained specific unadjusted broker quotes based on net fund value and, to a lesser extent, unobservable inputs from at least one knowledgeable outside security broker to determine the fair value as of June 30, 2017 . Level 1 Measurements - Fair values of financial assets and financial liabilities are obtained from an independent pricing service, and are based on unadjusted quoted prices for identical assets or liabilities in active markets. Additional pricing services and closing exchange values are used as a comparison to ensure that reasonable fair values are used in pricing the investment portfolio. U.S. government bonds and agencies/Short-term bonds : Valued using unadjusted quoted market prices for identical assets in active markets. Common stock : Comprised of actively traded, exchange listed U.S. and international equity securities and valued based on unadjusted quoted prices for identical assets in active markets. Money market instruments : Valued based on unadjusted quoted prices for identical assets in active markets. Options sold : Comprised of free-standing exchange listed derivatives that are actively traded and valued based on unadjusted quoted prices for identical instruments in active markets. Level 2 Measurements - Fair values of financial assets and financial liabilities are obtained from an independent pricing service or outside brokers, and are based on prices for similar assets or liabilities in active markets or valuation models whose inputs are observable, directly or indirectly, for substantially the full term of the asset or liability. Additional pricing services are used as a comparison to ensure reliable fair values are used in pricing the investment portfolio. Municipal securities : Valued based on models or matrices using inputs such as quoted prices for identical or similar assets in active markets. Mortgage-backed securities : Comprised of securities that are collateralized by residential and commercial mortgage loans valued based on models or matrices using multiple observable inputs, such as benchmark yields, reported trades and broker/dealer quotes, for identical or similar assets in active markets. The Company had holdings of $24.8 million and $30.0 million at June 30, 2017 and December 31, 2016 , respectively, in commercial mortgage-backed securities. Corporate securities/Short-term bonds : Valued based on a multi-dimensional model using multiple observable inputs, such as benchmark yields, reported trades, broker/dealer quotes and issue spreads, for identical or similar assets in active markets. Non-redeemable preferred stock : Valued based on observable inputs, such as underlying and common stock of same issuer and appropriate spread over a comparable U.S. Treasury security, for identical or similar assets in active markets. Total return swaps : Valued based on multi-dimensional models using inputs such as interest rate yield curves, underlying debt/credit instruments and the appropriate benchmark spread for similar assets in active markets, observable for substantially the full term of the contract. Collateralized loan obligations : Valued based on underlying debt instruments and the appropriate benchmark spread for similar assets in active markets. Other asset-backed securities : Comprised of securities that are collateralized by non-mortgage assets, such as automobile loans, valued based on models or matrices using multiple observable inputs, such as benchmark yields, reported trades and broker/dealer quotes, for identical or similar assets in active markets. Level 3 Measurements - Fair values of financial assets are based on inputs that are both unobservable and significant to the overall fair value measurement, including any items in which the evaluated prices obtained elsewhere were deemed to be of a distressed trading level. Private equity funds : Valued based on underlying debt/credit instruments and the appropriate benchmark spread for similar assets in active markets taking into consideration unobservable inputs related to liquidity assumptions. The Company’s financial instruments at fair value are reflected in the consolidated balance sheets on a trade-date basis. Related unrealized gains or losses are recognized in net realized investment gains or losses in the consolidated statements of operations. Fair value measurements are not adjusted for transaction costs. The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values: June 30, 2017 Level 1 Level 2 Level 3 Total (Amounts in thousands) Assets Fixed maturity securities: U.S. government bonds and agencies $ 11,735 $ — $ — $ 11,735 Municipal securities — 2,603,646 — 2,603,646 Mortgage-backed securities — 33,551 — 33,551 Corporate securities — 165,880 — 165,880 Collateralized loan obligations — 83,465 — 83,465 Other asset-backed securities — 53,807 — 53,807 Total fixed maturity securities 11,735 2,940,349 — 2,952,084 Equity securities: Common stock 392,514 — — 392,514 Non-redeemable preferred stock — 25,751 — 25,751 Private equity funds — — 8,764 8,764 Total equity securities 392,514 25,751 8,764 427,029 Short-term investments: Short-term bonds 29,997 15,994 — 45,991 Money market instruments 234,054 — — 234,054 Total short-term investments 264,051 15,994 — 280,045 Total assets at fair value $ 668,300 $ 2,982,094 $ 8,764 $ 3,659,158 Liabilities Other liabilities: Total return swaps $ — $ 1,725 $ — $ 1,725 Options sold 104 — — 104 Total liabilities at fair value $ 104 $ 1,725 $ — $ 1,829 December 31, 2016 Level 1 Level 2 Level 3 Total (Amounts in thousands) Assets Fixed maturity securities: U.S. government bonds and agencies $ 12,275 $ — $ — $ 12,275 Municipal securities — 2,449,292 — 2,449,292 Mortgage-backed securities — 39,777 — 39,777 Corporate securities — 189,688 — 189,688 Collateralized loan obligations — 86,525 — 86,525 Other asset-backed securities — 36,996 — 36,996 Total fixed maturity securities 12,275 2,802,278 — 2,814,553 Equity securities: Common stock 316,450 — — 316,450 Non-redeemable preferred stock — 31,809 — 31,809 Private equity fund — — 9,068 9,068 Total equity securities 316,450 31,809 9,068 357,327 Short-term investments: Short-term bonds 70,393 20,233 — 90,626 Money market instruments 285,054 — — 285,054 Total short-term investments 355,447 20,233 — 375,680 Other assets: Total return swaps — 667 — 667 Total assets at fair value $ 684,172 $ 2,854,987 $ 9,068 $ 3,548,227 Liabilities Other liabilities: Total return swaps $ — $ 765 $ — $ 765 Options sold 20 — — 20 Total liabilities at fair value $ 20 $ 765 $ — $ 785 The following table presents a summary of changes in fair value of Level 3 financial assets and financial liabilities: Private Equity Fund Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Beginning balance $ 9,018 $ 8,991 $ 9,068 $ 10,431 Realized losses included in earnings (254 ) (19 ) (304 ) (1,459 ) Ending balance $ 8,764 $ 8,972 $ 8,764 $ 8,972 The amount of total losses for the period included in earnings attributable to assets still held at June 30 $ (254 ) $ (19 ) $ (304 ) $ (1,459 ) There were no transfers between Levels 1, 2, and 3 of the fair value hierarchy during the six months ended June 30, 2017 and 2016 . At June 30, 2017 , the Company did not have any nonrecurring fair value measurements of nonfinancial assets or nonfinancial liabilities. Financial Instruments Disclosed, But Not Carried, at Fair Value The following tables present the carrying value and fair value of the Company’s financial instruments disclosed, but not carried, at fair value, and the level within the fair value hierarchy at which such instruments are categorized: June 30, 2017 Carrying Value Fair Value Level 1 Level 2 Level 3 (Amounts in thousands) Liabilities Notes payable: Unsecured notes $ 371,136 $ 380,059 $ — $ 380,059 $ — December 31, 2016 Carrying Value Fair Value Level 1 Level 2 Level 3 (Amounts in thousands) Liabilities Notes payable: Secured notes $ 140,000 $ 140,000 $ — $ 140,000 $ — Unsecured notes 180,000 180,000 — 180,000 — Secured Notes The fair values of the Company’s $120 million secured note and $20 million secured note at December 31, 2016 were estimated based on assumptions and inputs, such as the market value of underlying collateral and reset rates, for similarly termed notes that are observable in the market. In addition, the fair values of these secured notes approximate their carrying values, as the interest rates on these securities are variable and approximate current market interest rates. Unsecured Notes The fair value of the Company’s publicly traded $375 million unsecured note at June 30, 2017 was obtained from a third party pricing service and pricing was based on the spreads above the risk-free yield curve. These spreads are generally obtained from the new issue market, secondary trading and broker-dealer quotes. The fair value of the Company's $180 million unsecured note at December 31, 2016 was based on the unadjusted quoted price for similar notes in active markets. In addition, the fair value of this unsecured note approximates its carrying value, as the interest rate on this security is variable and approximates current market interest rates. See Note 11. Notes Payable for additional information on secured and unsecured notes.

Derivative Financial Instrument

Derivative Financial Instruments	6 Months Ended
	Jun. 30, 2017
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Derivative Financial Instruments	Derivative Financial Instruments The Company is exposed to certain risks relating to its ongoing business operations. The primary risk managed by using derivative instruments is equity price risk. Equity contracts (options sold) on various equity securities are intended to manage the price risk associated with forecasted purchases or sales of such securities. The Company also enters into derivative contracts to enhance returns on its investment portfolio. On February 13, 2014 , Fannette Funding LLC (“FFL”), a special purpose investment vehicle formed and consolidated by the Company, entered into a total return swap agreement with Citibank. Under the agreement, FFL receives the income equivalent on underlying obligations due to Citibank and pays to Citibank interest on the outstanding notional amount of the underlying obligations. The total return swap is secured by approximately $30 million of U.S. Treasuries as collateral, which are included in short-term investments on the consolidated balance sheets. The Company paid interest, which was equal to LIBOR plus 145 basis points prior to the renewal of the agreement in January 2017 and LIBOR plus 128 basis points subsequent to the renewal, on approximately $104 million and $108 million of underlying obligations as of June 30, 2017 and December 31, 2016 , respectively. The agreement had an initial term of one year, subject to annual renewal. In January 2017, the agreement was renewed for an additional year expiring February 17, 2018, and the interest rate was changed to LIBOR plus 128 basis points. On August 9, 2013 , Animas Funding LLC (“AFL”), a special purpose investment vehicle formed and consolidated by the Company, entered into a three -year total return swap agreement with Citibank, which has been renewed for an additional one-year term through February 17, 2018. During June 2017, the total portfolio of underlying obligations was liquidated, and the total return swap agreement between AFL and Citibank was terminated on July 7, 2017. Under the agreement, AFL received the income equivalent on underlying obligations due to Citibank and paid to Citibank interest on the outstanding notional amount of the underlying obligations. The total return swap was secured by approximately $40 million of U.S. Treasuries as collateral, which were included in short-term investments on the consolidated balance sheets. The Company paid interest, which was equal to LIBOR plus 135 basis points prior to the amendment of the agreement in January 2017 and LIBOR plus 128 basis points subsequent to the amendment, on approximately $152 million of underlying obligations as of December 31, 2016 . The following tables present the location and amounts of derivative fair values in the consolidated balance sheets and derivative (losses) gains in the consolidated statements of operations: Asset Derivatives Liability Derivatives June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 (Amounts in thousands) Total return swaps - Other assets $ — $ 667 $ — $ — Options sold - Other liabilities — — 104 20 Total return swaps - Other liabilities — — 1,725 765 Total derivatives $ — $ 667 $ 1,829 $ 785 (Losses) Gains Recognized in Income Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Total return swaps - Net realized investment (losses) gains $ (1,634 ) $ 2,581 $ (2,654 ) $ 3,744 Options sold - Net realized investment gains 1,005 1,350 1,301 2,294 Total $ (629 ) $ 3,931 $ (1,353 ) $ 6,038 Most options sold consist of covered calls. The Company writes covered calls on underlying equity positions held as an enhanced income strategy that is permitted for the Company’s insurance subsidiaries under statutory regulations. The Company manages the risk associated with covered calls through strict capital limitations and asset diversification throughout various industries. See Note 5. Fair Value Measurements for additional disclosures regarding options sold.

Goodwill and Other Intangible A

Goodwill and Other Intangible Assets	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Goodwill and Other Intangible Assets	Goodwill and Other Intangible Assets Goodwill There were no changes in the carrying amount of goodwill during the three and six months ended June 30, 2017 and 2016 . Goodwill is reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during the three and six months ended June 30, 2017 and 2016 . All of the Company's goodwill is associated with the Property and Casualty business segment (See Note 13. Segment Information for additional information on the reportable business segment). Other Intangible Assets The following table presents the components of other intangible assets: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives (Amounts in thousands) (in years) As of June 30, 2017: Customer relationships $ 52,430 $ (41,472 ) $ 10,958 11 Trade names 15,400 (5,454 ) 9,946 24 Technology 4,300 (3,655 ) 645 10 Insurance license 1,400 — 1,400 Indefinite Total other intangible assets, net $ 73,530 $ (50,581 ) $ 22,949 As of December 31, 2016: Customer relationships $ 52,430 $ (39,332 ) $ 13,098 11 Trade names 15,400 (5,133 ) 10,267 24 Technology 4,300 (3,440 ) 860 10 Insurance license 1,400 — 1,400 Indefinite Total other intangible assets, net $ 73,530 $ (47,905 ) $ 25,625 Other intangible assets are reviewed annually for impairment and more frequently if potential impairment indicators exist. No impairment indicators were identified during the three and six months ended June 30, 2017 and 2016 . Other intangible assets with definite useful lives are amortized on a straight-line basis over their useful lives. Other intangible assets amortization expense was $1.3 million and $1.5 million for the three months ended June 30, 2017 and 2016 , respectively, and $2.7 million and $3.0 million for the six months ended June 30, 2017 and 2016 , respectively. The following table presents the estimated future amortization expense related to other intangible assets as of June 30, 2017 : Year Amortization Expense (Amounts in thousands) Remainder of 2017 $ 2,673 2018 5,335 2019 4,905 2020 758 2021 738 Thereafter 7,140 Total $ 21,549

Share-Based Compensation

Share-Based Compensation	6 Months Ended
	Jun. 30, 2017
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Share-Based Compensation	Share-Based Compensation Share-based compensation expense for all share-based payment awards granted or modified is based on the estimated grant-date fair value. The Company recognizes these compensation costs on a straight-line basis over the requisite service period of the award. As of June 30, 2017 , all outstanding stock options have a term of ten years from the date of grant and become exercisable in four equal installments on the first through fourth anniversaries of the grant date. The fair value of stock option awards is estimated using the Black-Scholes option pricing model with the grant-date assumptions and weighted-average fair values. In February 2015, the Company's Board of Directors adopted the 2015 Incentive Award Plan (the "2015 Plan"), replacing the 2005 Equity Incentive Plan (the "2005 Plan") which expired in January 2015. The 2015 Plan was approved at the Company's Annual Meeting of Shareholders in May 2015. A maximum of 4,900,000 shares of common stock are authorized for issuance under the 2015 Plan upon exercise of stock options, stock appreciation rights and other awards, or upon vesting of restricted stock unit ("RSU") or deferred stock awards. As of June 30, 2017 , 184,500 RSUs were outstanding and 4,715,500 shares of common stock were available for future issuances under the 2015 Plan. The Compensation Committee of the Company’s Board of Directors granted RSU awards to the Company’s senior management and key employees which will vest based upon the Company's performance during three-year performance periods ending on December 31, 2017 and 2018: Grant Year 2016 2015 Three-year performance period ending December 31, 2018 2017 Vesting shares, target (net of forfeited) 90,750 93,750 Vesting shares, maximum (net of forfeited) 170,156 175,781 The RSUs vest at the end of a three -year performance period beginning with the year of the grant, and then only if, and to the extent that, the Company’s performance during the performance period achieves the threshold established by the Compensation Committee of the Company’s Board of Directors. Performance thresholds are based on the Company’s cumulative underwriting income, annual underwriting income, and net earned premium growth. In March 2017, a total of approximately $3.6 million was paid upon the vesting of 61,445 RSUs awarded in 2014 resulting from the attainment of performance goals above the target threshold during the three -year performance period ended December 31, 2016 . In February 2016, 88,074 shares of common stock, net of 58,822 shares withheld for payroll taxes, were issued upon the vesting of 146,896 RSUs awarded in 2013 resulting from the attainment of performance goals above the target threshold during the three -year performance period ended December 31, 2015. As of June 30, 2017 , 5,000 and 5,500 target RSUs granted in 2016 and 2015, respectively, were forfeited because the recipients were no longer employed by the Company. The fair value of each RSU grant was determined based on the market price of the Company's common stock on the grant date. Compensation cost is recognized based on management’s best estimate that performance goals will be achieved. If such goals are not met, no compensation cost will be recognized and any recognized compensation cost will be reversed. No stock options or RSUs were awarded during the six months ended June 30, 2017 .

Income Taxes

Income Taxes	6 Months Ended
	Jun. 30, 2017
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Income Taxes	Income Taxes For financial statement purposes, the Company recognizes tax benefits related to positions taken, or expected to be taken, on a tax return only if, the positions are “more-likely-than-not” sustainable. Once this threshold has been met, the Company’s measurement of its expected tax benefits is recognized in its financial statements. There was a $0.3 million increase to the total amount of unrecognized tax benefit related to tax uncertainties during the six months ended June 30, 2017 . The increase was the result of tax positions taken regarding state tax apportionment issues based on management’s best judgment given the facts, circumstances, and information available at the reporting date. The Company does not expect any changes in such unrecognized tax benefits to have a significant impact on its consolidated financial statements within the next 12 months. The Company and its subsidiaries file income tax returns with the Internal Revenue Service and the taxing authorities of various states. Tax years that remain subject to examination by major taxing jurisdictions are 2013 through 2015 for federal taxes, and 2003 through 2015 for California state taxes. The Company is currently under examination by the California Franchise Tax Board (“FTB”) for tax years 2003 through 2013. The FTB issued Notices of Proposed Assessments ("NPAs") to the Company for tax years 2003 through 2010, which the Company formally protested. The proposed adjustments for tax years 2003 through 2006 were affirmed following an administrative protest process with the FTB examination. The Company is in settlement discussions with the FTB and believes a reasonable settlement could be reached during 2017 with regard to tax years 2003 through 2010. If a reasonable settlement is not reached, the Company intends to pursue other options, including a formal hearing with the State Board of Equalization, an appeal with the California Office of Tax Appeals, or litigation in superior court. The FTB has not yet issued NPAs for the 2011 through 2013 tax years. Management believes that the resolution of these examinations and assessments will not have a material impact on the Company's consolidated financial statements. Deferred tax assets and liabilities are recognized for the estimated future tax consequences attributable to differences between the financial reporting basis and the respective tax basis of the Company’s assets and liabilities, and expected benefits of utilizing net operating loss, capital loss, and tax-credit carryforwards. The Company assesses the likelihood that its deferred tax assets will be realized and, to the extent management does not believe these assets are more likely than not to be realized, a valuation allowance is established. Deferred tax assets and liabilities are measured using enacted tax rates expected to apply to taxable income in the years in which those temporary differences are expected to be recovered or settled. The effect on deferred tax assets and liabilities of a change in tax rates or laws is recognized in earnings in the period that includes the enactment date. At June 30, 2017 , the Company’s deferred income taxes were in a net asset position, which included a combination of ordinary and capital deferred tax benefits. In assessing the Company’s ability to realize deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon generating sufficient taxable income of the appropriate character within the carryback and carryforward periods available under the tax law. Management considers the reversal of deferred tax liabilities, projected future taxable income of an appropriate nature, and tax-planning strategies in making this assessment. The Company believes that through the use of prudent tax planning strategies and the generation of capital gains, sufficient income will be realized in order to maximize the full benefits of its deferred tax assets. Although realization is not assured, management believes that it is more likely than not that the Company’s deferred tax assets will be realized.

Losses And Loss Adjustment Expe

Losses And Loss Adjustment Expense Reserves	6 Months Ended
	Jun. 30, 2017
Insurance Loss Reserves [Abstract]
Losses And Loss Adjustment Expense Reserves	Loss and Loss Adjustment Expense Reserves The following table presents the activity in loss and loss adjustment expense reserves: Six Months Ended June 30, 2017 2016 (Amounts in thousands) Gross reserves at January 1 $ 1,290,248 $ 1,146,688 Less reinsurance recoverable (13,161 ) (14,253 ) Net reserves at January 1 1,277,087 1,132,435 Incurred losses and loss adjustment expenses related to: Current year 1,181,108 1,127,203 Prior years 14,152 61,965 Total incurred losses and loss adjustment expenses 1,195,260 1,189,168 Loss and loss adjustment expense payments related to: Current year 685,137 650,741 Prior years 471,973 474,124 Total payments 1,157,110 1,124,865 Net reserves at June 30 1,315,237 1,196,738 Reinsurance recoverable 11,726 14,055 Gross reserves at June 30 $ 1,326,963 $ 1,210,793 The increase in the provision for insured events of prior years in 2017 of approximately $14.2 million was primarily attributable to higher than estimated California property losses. The increase in the provision for insured events of prior years in 2016 of approximately $62.0 million primarily resulted from the re-estimation of losses for California and Florida automobile liability coverages. For the six months ended June 30, 2017 and 2016 , the Company recorded catastrophe losses of approximately $40 million and $19 million , respectively. The 2017 catastrophe losses were primarily due to severe rainstorms in California, as well as storms and tornadoes in Oklahoma and Texas. The Winter of 2017 was extremely wet in California, setting new precipitation records in parts of the state. The 2016 catastrophe losses were mainly attributable to severe storms in Texas and northern California.

Notes Payable

Notes Payable	6 Months Ended
	Jun. 30, 2017
Notes Payable [Abstract]
Notes Payable	Notes Payable Notes payable consists of the following: Lender Interest Rate Maturity Date June 30, 2017 December 31, 2016 (Amounts in thousands) Secured credit facility (1) Bank of America LIBOR plus 40 basis points December 3, 2018 $ — $ 120,000 Secured loan (1) Union Bank LIBOR plus 40 basis points December 3, 2017 — 20,000 Unsecured credit facility (1) Bank of America and Union Bank LIBOR plus 112.5-162.5 basis points December 3, 2019 — 180,000 Senior unsecured notes (2) Publicly traded 4.40% March 15, 2027 375,000 — Unsecured credit facility (3) Bank of America and Wells Fargo Bank LIBOR plus 112.5-162.5 basis points March 29, 2022 — — Total principal amount 375,000 320,000 Less unamortized discount and debt issuance costs (4) 3,864 — Total debt $ 371,136 $ 320,000 __________ (1) On March 8, 2017, the loan and credit facility agreements were terminated and the Company repaid the total outstanding amounts with the proceeds from its public offering of $375 million of senior notes. (2) On March 8, 2017, the Company completed a public debt offering issuing $375 million of senior notes. The notes are unsecured, senior obligations of the Company with a 4.40% annual coupon payable on March 15 and September 15 of each year commencing September 15, 2017. These notes mature on March 15, 2027. The Company used the proceeds from the notes to pay off amounts outstanding under the existing loan and credit facilities and for general corporate purposes. The Company incurred debt issuance costs of approximately $3.4 million , inclusive of underwriters' fees. The notes were issued at a slight discount of 99.847% of par, resulting in the effective annualized interest rate including debt issuance costs of approximately 4.45% . (3) On March 29, 2017, the Company entered into an unsecured credit agreement that provides for revolving loans of up to $50 million and matures on March 29, 2022. The interest rates on borrowings under the credit facility are based on the Company's debt to total capital ratio and range from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is greater than or equal to 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is greater than or equal to 25%. The debt to total capital ratio is expressed as a percentage of (a) consolidated debt to (b) consolidated shareholders' equity plus consolidated debt. The Company's debt to total capital ratio was 17.5% at June 30, 2017 , resulting in a 15 basis point commitment fee on the $50 million undrawn portion of the credit facility. As of July 27, 2017 , there have been no borrowings under this facility. (4) The unamortized discount and debt issuance costs of approximately $3.9 million are associated with the publicly traded $375 million senior unsecured notes. These are amortized to interest expense over the life of the notes, and the unamortized balance is presented in the Company's consolidated balance sheets as a direct deduction from the carrying amount of the debt. The unamortized debt issuance cost of approximately $0.2 million associated with the $50 million five -year unsecured revolving credit facility maturing on March 29, 2022 is included in other assets in the Company's consolidated balance sheets and amortized to interest expense over the term of the credit facility.

Contingencies

Contingencies	6 Months Ended
	Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
Contingencies	Contingencies The Company is, from time to time, named as a defendant in various lawsuits or regulatory actions incidental to its insurance business. The majority of lawsuits brought against the Company relate to insurance claims that arise in the normal course of business and are reserved for through the reserving process. For a discussion of the Company’s reserving methods, see the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . In March 2006, the California DOI issued an Amended Notice of Non-Compliance to a Notice of Non-Compliance originally issued in February 2004 (as amended, “2004 NNC”) alleging that the Company charged rates in violation of the California Insurance Code, willfully permitted its agents to charge broker fees in violation of California law, and willfully misrepresented the actual price insurance consumers could expect to pay for insurance by the amount of a fee charged by the consumer's insurance broker. The California DOI sought to impose a fine for each policy on which the Company allegedly permitted an agent to charge a broker fee, to impose a penalty for each policy on which the Company allegedly used a misleading advertisement, and to suspend certificates of authority for a period of one year. In January 2012, the administrative law judge bifurcated the 2004 NNC between (a) the California DOI’s order to show cause (the “OSC”), in which the California DOI asserts the false advertising allegations and accusation, and (b) the California DOI’s notice of noncompliance (the “NNC”), in which the California DOI asserts the unlawful rate allegations. In February 2012, the administrative law judge (“ALJ”) submitted a proposed decision dismissing the NNC, but the Commissioner rejected the ALJ’s proposed decision. The Company challenged the rejection in Los Angeles Superior Court in April 2012, and the Commissioner responded with a demurrer. Following a hearing, the Superior Court sustained the Commissioner’s demurrer, based on the Company’s failure to exhaust its administrative remedies, and the Company appealed. The Court of Appeal affirmed the Superior Court's ruling that the Company was required to exhaust its administrative remedies, but expressly preserved for later appeal the legal basis for the ALJ’s dismissal: violation of the Company’s due process rights. Following an evidentiary hearing in April 2013, post-hearing briefs, and an unsuccessful mediation, the ALJ closed the evidentiary record on April 30, 2014. Although a proposed decision was to be submitted to the Commissioner on or before June 30, 2014, after which the Commissioner would have 100 days to accept, reject or modify the proposed decision, the proposed decision was not submitted until December 8, 2014. On January 7, 2015, the Commissioner adopted the ALJ’s proposed decision, which became the Commissioner’s adopted order (the "Order"). The decision and Order found that from the period July 1, 1996, through 2006, the Company’s "brokers" were actually operating as "de facto agents" and that the charging of "broker fees" by these producers constituted the charging of "premium" in excess of the Company's approved rates, and assessed a civil penalty in the amount of $27.6 million against the Company. On February 9, 2015, the Company filed a Writ of Administrative Mandamus and Complaint for Declaratory Relief (the “Writ”) in the Orange County Superior Court seeking, among other things, to require the Commissioner to vacate the Order, to stay the Order while the Superior Court action is pending, and to judicially declare as invalid the Commissioner’s interpretation of certain provisions of the California Insurance Code. Subsequent to the filing of the Writ, a consumer group petitioned and was granted the right to intervene in the Superior Court action. The Court did not order a stay, and the $27.6 million assessed penalty was paid in March 2015. The Company filed an amended Writ on September 11, 2015, adding an explicit request for a refund of the penalty, with interest. On August 12, 2016, the Superior Court issued its ruling on the Writ, for the most part granting the relief sought by the Company. The Superior Court found that the Commissioner and the California DOI did commit due process violations, but declined to dismiss the case on those grounds. The Superior Court also agreed with the Company that the broker fees at issue were not premium, and that the penalties imposed by the Commissioner were improper, and therefore vacated the Order imposing the penalty. The Superior Court entered final judgment on November 17, 2016, issuing a writ requiring the Commissioner to refund the entire penalty amount within 120 days, plus prejudgment interest at the statutory rate of 7% . On January 12, 2017, the California DOI filed a notice of appeal of the Superior Court's judgment entered on November 17, 2016. While the appeal is still pending, the California DOI returned the entire penalty amount plus accrued interest, a total of $30.9 million , to the Company in June 2017 in order to avoid accruing further interest. Because the matter has been appealed, the Company has not yet recognized the $30.9 million as a gain in the consolidated income statement; instead, the Company recorded the $30.9 million in other liabilities in the consolidated balance sheet at June 30, 2017. The Company had filed a motion to dismiss the false advertising portion of the case based on the Superior Court's findings, but the ALJ denied that motion after the appeal was filed. The ALJ did, however, grant the Company's alternative request to stay further proceedings pending the final determination of the appeal. The Company has accrued a liability for the estimated cost to continue to defend itself in the false advertising OSC. Based upon its understanding of the facts and the California Insurance Code, the Company does not expect that the ultimate resolution of the false advertising OSC will be material to its financial position. The Company establishes reserves for non-insurance claims related lawsuits, regulatory actions, and other contingencies when the Company believes a loss is probable and is able to estimate its potential exposure. For loss contingencies believed to be reasonably possible, the Company also discloses the nature of the loss contingency and an estimate of the possible loss, range of loss, or a statement that such an estimate cannot be made. While actual losses may differ from the amounts recorded and the ultimate outcome of the Company's pending actions is generally not yet determinable, the Company does not believe that the ultimate resolution of currently pending legal or regulatory proceedings, either individually or in the aggregate, will have a material adverse effect on its financial condition or cash flows. In all cases, the Company vigorously defends itself unless a reasonable settlement appears appropriate. For a discussion of legal matters, see the Company’s Annual Report on Form 10-K for the year ended December 31, 2016.

Segment Information

Segment Information	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Segment Information	Segment Information The Company is primarily engaged in writing personal automobile insurance and provides related property and casualty insurance products to its customers through 14 subsidiaries in 11 states, principally in California. The Company has one reportable business segment - the Property and Casualty business segment. The Company’s Chief Operating Decision Maker evaluates operating results based on pre-tax underwriting results which is calculated as net premiums earned less (a) losses and loss adjustment expenses and (b) underwriting expenses (policy acquisition costs and other operating expenses). Expenses are allocated based on certain assumptions that are primarily related to premiums and losses. The Company’s net investment income, net realized investment gains or losses, other income, and interest expense are excluded in evaluating pretax underwriting profit. The Company does not allocate its assets, including investments, or income taxes in evaluating pre-tax underwriting profit. Property and Casualty Lines The Property and Casualty business segment offers several insurance products to the Company’s individual customers and small business customers. These insurance products are: private passenger automobile which is the Company’s primary business, and related insurance products such as homeowners, commercial automobile and commercial property. These related insurance products are primarily sold to the Company’s individual customers and small business customers, which increases retention of the Company’s private passenger automobile client base. The insurance products comprising the Property and Casualty business segment are sold through the same distribution channels, mainly through independent and 100% owned insurance agents, and go through a similar underwriting process. Other Lines The Other business segment represents net premiums written and earned from an operating segment that does not meet the quantitative thresholds required to be considered a reportable segment. This operating segment offers automobile mechanical protection warranties which are primarily sold through automobile dealerships and credit unions. The following tables present the Company's operating results by reportable segment: Three Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Net premiums earned $ 789.0 $ 8.7 $ 797.7 $ 768.6 $ 10.7 $ 779.3 Less: Losses and loss adjustment expenses 584.2 4.4 588.6 589.4 5.7 595.1 Underwriting expenses 187.3 4.0 191.3 193.4 4.2 197.6 Underwriting gain (loss) 17.5 0.3 17.8 (14.2 ) 0.8 (13.4 ) Investment income 31.9 31.5 Net realized investment gains 21.1 45.4 Other income 2.1 1.9 Interest expense (4.2 ) (1.0 ) Pre-tax income $ 68.8 $ 64.3 Net income $ 51.6 $ 48.9 Six Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Net premiums earned $ 1,569.7 $ 17.7 $ 1,587.4 $ 1,524.4 $ 22.0 $ 1,546.4 Less: Losses and loss adjustment expenses 1,186.0 9.3 1,195.3 1,177.4 11.8 1,189.2 Underwriting expenses 391.1 7.9 399.0 391.3 9.1 400.4 Underwriting (loss) gain (7.4 ) 0.5 (6.9 ) (44.3 ) 1.1 (43.2 ) Investment income 63.1 61.1 Net realized investment gains 45.6 70.4 Other income 4.3 4.0 Interest expense (6.7 ) (1.9 ) Pre-tax income $ 99.4 $ 90.4 Net income $ 78.6 $ 72.2 The following tables present the Company’s net premiums earned and direct premiums written by line of insurance business: Three Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Private passenger automobile $ 617.3 $ — $ 617.3 $ 607.1 $ — $ 607.1 Homeowners 108.3 — 108.3 102.0 — 102.0 Commercial automobile 42.4 — 42.4 39.9 — 39.9 Other 21.0 8.7 29.7 19.6 10.7 30.3 Net premiums earned $ 789.0 $ 8.7 $ 797.7 $ 768.6 $ 10.7 $ 779.3 Private passenger automobile $ 600.1 $ — $ 600.1 $ 595.4 $ — $ 595.4 Homeowners 122.7 — 122.7 116.3 — 116.3 Commercial automobile 45.1 — 45.1 42.4 — 42.4 Other 24.2 8.5 32.7 23.0 6.9 29.9 Direct premiums written $ 792.1 $ 8.5 $ 800.6 $ 777.1 $ 6.9 $ 784.0 Six Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Private passenger automobile $ 1,230.5 $ — $ 1,230.5 $ 1,206.1 $ — $ 1,206.1 Homeowners 214.0 — 214.0 201.5 — 201.5 Commercial automobile 83.7 — 83.7 78.6 — 78.6 Other 41.5 17.7 59.2 38.2 22.0 60.2 Net premiums earned $ 1,569.7 $ 17.7 $ 1,587.4 $ 1,524.4 $ 22.0 $ 1,546.4 Private passenger automobile $ 1,239.1 $ — $ 1,239.1 $ 1,227.2 $ — $ 1,227.2 Homeowners 226.5 — 226.5 215.4 — 215.4 Commercial automobile 88.1 — 88.1 83.3 — 83.3 Other 47.0 14.2 61.2 43.9 14.3 58.2 Direct premiums written $ 1,600.7 $ 14.2 $ 1,614.9 $ 1,569.8 $ 14.3 $ 1,584.1

General (Policy)

General (Policy)	6 Months Ended
	Jun. 30, 2017
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Consolidation and Basis of Presentation	The interim consolidated financial statements include the accounts of Mercury General Corporation and its subsidiaries (referred to herein collectively as the “Company”). For the list of the Company’s subsidiaries, see Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 . These interim financial statements have been prepared in conformity with U.S. generally accepted accounting principles (“GAAP”), which differ in some respects from those filed in reports to insurance regulatory authorities. The financial data of the Company included herein are unaudited. In the opinion of management, all material adjustments of a normal recurring nature have been made to present fairly the Company’s financial position at June 30, 2017 and the results of operations and cash flows for the periods presented. All intercompany transactions and balances have been eliminated. Certain financial information that is normally included in annual financial statements prepared in accordance with GAAP, but that is not required for interim reporting purposes, has been omitted from the accompanying interim consolidated financial statements and related notes. Readers are urged to review the Company’s Annual Report on Form 10-K for the year ended December 31, 2016 for more complete descriptions and discussions. Operating results and cash flows for the six months ended June 30, 2017 are not necessarily indicative of the results that may be expected for the year ending December 31, 2017 .
Use of Estimates	The preparation of financial statements in conformity with GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities, disclosures of contingent assets and liabilities at the date of the financial statements, and the reported amounts of revenues and expenses during the reporting period. These estimates require the Company to apply complex assumptions and judgments, and often the Company must make estimates about the effects of matters that are inherently uncertain and will likely change in subsequent periods. The most significant assumptions in the preparation of these consolidated financial statements relate to reserves for losses and loss adjustment expenses. Actual results could differ from those estimates. See Note 1. Summary of Significant Accounting Policies of the Notes to Consolidated Financial Statements in the Company’s Annual Report on Form 10-K for the year ended December 31, 2016
Earnings per Share	Potentially dilutive securities representing approximately 28,000 and 48,000 shares of common stock for the three and six months ended June 30, 2016 , respectively, were excluded from the computation of diluted earnings per common share because their effect would have been anti-dilutive.
Deferred Policy Acquisition Costs	Deferred policy acquisition costs consist of commissions paid to outside agents, premium taxes, salaries, and certain other underwriting costs that are incremental or directly related to the successful acquisition of new and renewal insurance contracts and are amortized over the life of the related policy in proportion to premiums earned. Deferred policy acquisition costs are limited to the amount that will remain after deducting from unearned premiums and anticipated investment income, the estimated losses and loss adjustment expenses, and the servicing costs that will be incurred as premiums are earned. The Company’s deferred policy acquisition costs are further limited by excluding those costs not directly related to the successful acquisition of insurance contracts. Deferred policy acquisition cost amortization was $137.8 million and $139.9 million for the three months ended June 30, 2017 and 2016 , respectively, and $280.4 million and $281.5 million for the six months ended June 30, 2017 and 2016, respectively. The Company does not defer advertising expenditures but expenses them as incurred. The Company recorded net advertising expense of approximately $20 million and $24 million for the six months ended June 30, 2017 and 2016 , respectively.
Recently Issued Accounting Standards	In May 2017, the Financial Accounting Standards Board ("FASB") issued Accounting Standards Update ("ASU") 2017-09, " Compensation - Stock Compensation (Topic 718), Scope of Modification Accounting. " ASU 2017-09 provides guidance about which changes to the terms or conditions of a share-based payment award require an entity to apply modification accounting in Topic 718. ASU 2017-09 will be effective for the Company beginning January 1, 2018 with early adoption permitted. The Company does not anticipate that ASU 2017-09 will have a material impact on its consolidated financial statements and related disclosures. In January 2017, the FASB issued ASU 2017-04, " Intangibles - Goodwill and Other (Topic 350), Simplifying the Test for Goodwill Impairment. " ASU 2017-04 removes the requirement to compare the implied fair value of goodwill with its carrying amount as part of Step 2 of the goodwill impairment test and requires an entity to recognize an impairment charge for the amount by which the carrying amount of a reporting unit exceeds its fair value. An entity still has the option to perform the qualitative assessment for a reporting unit to determine if the quantitative impairment test is necessary. ASU 2017-04 will be effective for the Company beginning January 1, 2020 with early adoption permitted. The Company does not anticipate that ASU 2017-04 will have a material impact on its consolidated financial statements and related disclosures. In October 2016, the FASB issued ASU 2016-16, " Income Taxes (Topic 740), Intra-Entity Transfers of Assets Other Than Inventory. " ASU 2016-16 requires entities to recognize the income tax consequences of an intra-entity transfer of an asset other than inventory when the transfer occurs. Current GAAP prohibits the recognition of current and deferred income taxes for an intra-entity asset transfer until the asset has been sold to an outside party. ASU 2016-16 will be effective for the Company beginning January 1, 2018. The Company is evaluating the impact that ASU 2016-16 will have on its consolidated financial statements and related disclosures. In August 2016, the FASB issued ASU 2016-15, " Classification of Certain Cash Receipts and Cash Payments (Topic 230). " The new guidance is intended to reduce diversity in how certain transactions are classified in the consolidated statement of cash flows. ASU 2016-15 will be effective for the Company beginning January 1, 2018. The Company is evaluating the impact that ASU 2016-15 will have on its consolidated financial statements and related disclosures. In June 2016, the FASB issued ASU 2016-13, " Financial Instruments - Credit Losses (Topic 326). " The amendments in this ASU replace the "incurred loss" methodology for recognizing credit losses with a methodology that reflects expected credit losses and requires consideration of a broader range of information including past events, current conditions and reasonable and supportable forecasts that affect the collectibility of reported amounts of financial assets that are not accounted for at fair value through net income, such as loans, certain debt securities, trade receivables, net investment in leases, off-balance sheet credit exposures and reinsurance receivables. Under the current GAAP incurred loss methodology, recognition of the full amount of credit losses is generally delayed until the loss is probable of occurring. Current GAAP restricts the ability to record credit losses that are expected, but do not yet meet the probability threshold. ASU 2016-13 will be effective for the Company beginning with the first quarter ending March 31, 2020. While the Company is in the process of evaluating the impact of ASU 2016-13, it does not expect this ASU to have a material impact on its consolidated financial statements and related disclosures as most of its financial instruments with potential exposure to material credit losses are accounted for at fair value through net income. In March 2016, the FASB issued ASU 2016-09, " Compensation - Stock Compensation (Topic 718) ," which simplifies several aspects of the accounting for share-based payment transactions, including the income tax consequences, classification of awards as either equity or liabilities, and classification on the statement of cash flows. The Company adopted ASU 2016-09 for the quarter ended March 31, 2017. As a result of the adoption, the Company recognizes excess tax benefits in its provision for income taxes rather than paid-in capital. Additional amendments to accounting for income taxes and minimum statutory withholding tax requirements had no impact to retained earnings as of January 1, 2017, where the cumulative effect of these changes are required to be recorded. The Company elected to continue to estimate forfeitures expected to occur to determine the amount of compensation cost to be recognized in each period. The Company also elected to apply the presentation requirements for cash flows related excess tax benefits retrospectively to all periods presented, which resulted in an increase to both net cash provided by operating activities and net cash used in financing activities of approximately $904,000 for the six months ended June 30, 2016. The adoption of the presentation requirements for cash flows related to employee taxes paid for withheld shares resulted in an increase to both net cash provided by operating activities and net cash used in financing activities of approximately $3,200,000 for the six months ended June 30, 2016. In February 2016, the FASB issued ASU 2016-02, " Leases (Topic 842) ," which supersedes the guidance in Accounting Standards Codification ("ASC") 840, "Leases." ASU 2016-02 requires a lessee to recognize lease assets and lease liabilities resulting from all leases. ASU 2016-02 retains the distinction between a finance lease and an operating lease. Lessor accounting is largely unchanged from ASC 840. ASU 2016-02 will be effective for the Company beginning January 1, 2019. However, in transition, the Company will be required to recognize and measure leases at the beginning of the earliest period presented using a modified retrospective approach. While the Company is in the process of evaluating the impact of ASU 2016-02, it does not expect this ASU to have a material impact on its consolidated financial statements, except for recognizing lease assets and lease liabilities for its operating leases. The Company's lease obligations under various non-cancellable operating lease agreements amounted to approximately $27,000,000 at December 31, 2016. In January 2016, the FASB issued ASU 2016-01, " Financial Instruments-Overall (Subtopic 825-10) , Recognition and Measurement of Financial Assets and Financial Liabilities. " The amendments in this ASU address certain aspects of recognition, measurement, presentation and disclosure of financial instruments. ASU 2016-01: (1) requires equity investments (except those accounted for under the equity method or those that result in the consolidation of the investee) to be measured at fair value with changes in the fair value recognized in net income; (2) simplifies the impairment assessment of equity investments without readily determinable fair values by requiring a qualitative assessment to identify impairment; (3) eliminates the requirement for public business entities to disclose the method(s) and significant assumptions used to estimate the fair value that is required to be disclosed for financial instruments measured at amortized cost on the balance sheet; (4) requires the use of the exit price notion when measuring the fair value of financial instruments for disclosure purposes; (5) requires separate presentation of financial assets and financial liabilities by measurement category and form of financial asset on the balance sheet or the notes to the financial statements; and (6) clarifies that an entity should evaluate the need for a valuation allowance on a deferred tax asset related to available-for-sale securities in combination with the entity’s other deferred tax assets. ASU 2016-01 will be effective for the Company beginning January 1, 2018. The Company does not anticipate that ASU 2016-01 will have a material impact on its consolidated financial statements and related disclosures. In May 2014, the FASB issued ASU 2014-09, " Revenue from Contracts with Customers (Topic 606). " ASU 2014-09 requires entities to apply a five-step model to determine the amount and timing of revenue recognition. The model specifies, among other criteria, that revenue should be recognized when an entity transfers control of goods or services to a customer in the amount to which the entity expects to be entitled. In August 2015, the FASB issued ASU 2015-14, " Revenue from Contracts with Customers (Topic 606), Deferral of the Effective Date ," which deferred the effective date of ASU 2014-09 for the Company to January 1, 2018. Subsequently, the FASB has issued additional ASUs on Topic 606 that do not change the core principle of the guidance in ASU 2014-09 but merely clarify certain aspects of it. The additional ASUs will also be effective for the Company beginning January 1, 2018. Two methods of transition are permitted upon adoption: full retrospective and modified retrospective. The Company is evaluating both methods of transition and it is currently anticipated that a modified retrospective adoption approach will be used. However, as the accounting for insurance contracts is outside of the scope of ASU 2014-09, the Company does not expect the adoption of this ASU to have a material impact on its consolidated financial statements and related disclosures.

Fair Value of Financial Instr20

Fair Value of Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
Financial Instruments, Owned, at Fair Value [Abstract]
Estimated Fair Values of Financial Instruments	The following table presents the estimated fair values of financial instruments: June 30, 2017 December 31, 2016 (Amounts in thousands) Assets Investments $ 3,659,158 $ 3,547,560 Total return swaps — 667 Liabilities Total return swaps $ 1,725 $ 765 Options sold 104 20 Secured notes — 140,000 Unsecured notes 380,059 180,000

Fair Value Option (Tables)

Fair Value Option (Tables)	6 Months Ended
	Jun. 30, 2017
Fair Value Option [Abstract]
Gains And Losses Due To Changes In Fair Value Of Investments	The following table presents gains (losses) due to changes in fair value of investments that are measured at fair value pursuant to the application of the fair value option: Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Fixed maturity securities $ 25,622 $ 28,871 $ 35,909 $ 40,434 Equity securities (5,080 ) 8,666 6,462 15,573 Short-term investments (267 ) (410 ) (240 ) (349 ) Total gains $ 20,275 $ 37,127 $ 42,131 $ 55,658

Fair Value Measurement (Tables)

Fair Value Measurement (Tables)	6 Months Ended
	Jun. 30, 2017
Financial Instruments, Financial Assets, Balance Sheet Groupings [Abstract]
Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques	The following tables present information about the Company’s assets and liabilities measured at fair value on a recurring basis, and indicate the fair value hierarchy of the valuation techniques utilized by the Company to determine such fair values: June 30, 2017 Level 1 Level 2 Level 3 Total (Amounts in thousands) Assets Fixed maturity securities: U.S. government bonds and agencies $ 11,735 $ — $ — $ 11,735 Municipal securities — 2,603,646 — 2,603,646 Mortgage-backed securities — 33,551 — 33,551 Corporate securities — 165,880 — 165,880 Collateralized loan obligations — 83,465 — 83,465 Other asset-backed securities — 53,807 — 53,807 Total fixed maturity securities 11,735 2,940,349 — 2,952,084 Equity securities: Common stock 392,514 — — 392,514 Non-redeemable preferred stock — 25,751 — 25,751 Private equity funds — — 8,764 8,764 Total equity securities 392,514 25,751 8,764 427,029 Short-term investments: Short-term bonds 29,997 15,994 — 45,991 Money market instruments 234,054 — — 234,054 Total short-term investments 264,051 15,994 — 280,045 Total assets at fair value $ 668,300 $ 2,982,094 $ 8,764 $ 3,659,158 Liabilities Other liabilities: Total return swaps $ — $ 1,725 $ — $ 1,725 Options sold 104 — — 104 Total liabilities at fair value $ 104 $ 1,725 $ — $ 1,829 December 31, 2016 Level 1 Level 2 Level 3 Total (Amounts in thousands) Assets Fixed maturity securities: U.S. government bonds and agencies $ 12,275 $ — $ — $ 12,275 Municipal securities — 2,449,292 — 2,449,292 Mortgage-backed securities — 39,777 — 39,777 Corporate securities — 189,688 — 189,688 Collateralized loan obligations — 86,525 — 86,525 Other asset-backed securities — 36,996 — 36,996 Total fixed maturity securities 12,275 2,802,278 — 2,814,553 Equity securities: Common stock 316,450 — — 316,450 Non-redeemable preferred stock — 31,809 — 31,809 Private equity fund — — 9,068 9,068 Total equity securities 316,450 31,809 9,068 357,327 Short-term investments: Short-term bonds 70,393 20,233 — 90,626 Money market instruments 285,054 — — 285,054 Total short-term investments 355,447 20,233 — 375,680 Other assets: Total return swaps — 667 — 667 Total assets at fair value $ 684,172 $ 2,854,987 $ 9,068 $ 3,548,227 Liabilities Other liabilities: Total return swaps $ — $ 765 $ — $ 765 Options sold 20 — — 20 Total liabilities at fair value $ 20 $ 765 $ — $ 785 The following tables present the carrying value and fair value of the Company’s financial instruments disclosed, but not carried, at fair value, and the level within the fair value hierarchy at which such instruments are categorized: June 30, 2017 Carrying Value Fair Value Level 1 Level 2 Level 3 (Amounts in thousands) Liabilities Notes payable: Unsecured notes $ 371,136 $ 380,059 $ — $ 380,059 $ — December 31, 2016 Carrying Value Fair Value Level 1 Level 2 Level 3 (Amounts in thousands) Liabilities Notes payable: Secured notes $ 140,000 $ 140,000 $ — $ 140,000 $ — Unsecured notes 180,000 180,000 — 180,000 —
Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value	The following table presents a summary of changes in fair value of Level 3 financial assets and financial liabilities: Private Equity Fund Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Beginning balance $ 9,018 $ 8,991 $ 9,068 $ 10,431 Realized losses included in earnings (254 ) (19 ) (304 ) (1,459 ) Ending balance $ 8,764 $ 8,972 $ 8,764 $ 8,972 The amount of total losses for the period included in earnings attributable to assets still held at June 30 $ (254 ) $ (19 ) $ (304 ) $ (1,459 )

Derivative Financial Instrume23

Derivative Financial Instruments (Tables)	6 Months Ended
	Jun. 30, 2017
General Discussion of Derivative Instruments and Hedging Activities [Abstract]
Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets	The following tables present the location and amounts of derivative fair values in the consolidated balance sheets and derivative (losses) gains in the consolidated statements of operations: Asset Derivatives Liability Derivatives June 30, 2017 December 31, 2016 June 30, 2017 December 31, 2016 (Amounts in thousands) Total return swaps - Other assets $ — $ 667 $ — $ — Options sold - Other liabilities — — 104 20 Total return swaps - Other liabilities — — 1,725 765 Total derivatives $ — $ 667 $ 1,829 $ 785
Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations	(Losses) Gains Recognized in Income Three Months Ended June 30, Six Months Ended June 30, 2017 2016 2017 2016 (Amounts in thousands) Total return swaps - Net realized investment (losses) gains $ (1,634 ) $ 2,581 $ (2,654 ) $ 3,744 Options sold - Net realized investment gains 1,005 1,350 1,301 2,294 Total $ (629 ) $ 3,931 $ (1,353 ) $ 6,038

Goodwill and Other Intangible24

Goodwill and Other Intangible Assets (Tables)	6 Months Ended
	Jun. 30, 2017
Goodwill and Intangible Assets Disclosure [Abstract]
Schedule Of Components Of Other Intangible Assets	The following table presents the components of other intangible assets: Gross Carrying Amount Accumulated Amortization Net Carrying Amount Useful Lives (Amounts in thousands) (in years) As of June 30, 2017: Customer relationships $ 52,430 $ (41,472 ) $ 10,958 11 Trade names 15,400 (5,454 ) 9,946 24 Technology 4,300 (3,655 ) 645 10 Insurance license 1,400 — 1,400 Indefinite Total other intangible assets, net $ 73,530 $ (50,581 ) $ 22,949 As of December 31, 2016: Customer relationships $ 52,430 $ (39,332 ) $ 13,098 11 Trade names 15,400 (5,133 ) 10,267 24 Technology 4,300 (3,440 ) 860 10 Insurance license 1,400 — 1,400 Indefinite Total other intangible assets, net $ 73,530 $ (47,905 ) $ 25,625
Schedule Of Estimated Future Amortization Expense Related To Intangible Assets	The following table presents the estimated future amortization expense related to other intangible assets as of June 30, 2017 : Year Amortization Expense (Amounts in thousands) Remainder of 2017 $ 2,673 2018 5,335 2019 4,905 2020 758 2021 738 Thereafter 7,140 Total $ 21,549

Share-Based Compensation (Table

Share-Based Compensation (Tables)	6 Months Ended
	Jun. 30, 2017
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Schedule Of Performance Vesting Restricted Stock Units Granted	The Compensation Committee of the Company’s Board of Directors granted RSU awards to the Company’s senior management and key employees which will vest based upon the Company's performance during three-year performance periods ending on December 31, 2017 and 2018: Grant Year 2016 2015 Three-year performance period ending December 31, 2018 2017 Vesting shares, target (net of forfeited) 90,750 93,750 Vesting shares, maximum (net of forfeited) 170,156 175,781

Losses And Loss Adjustment Ex26

Losses And Loss Adjustment Expense Reserves (Tables)	6 Months Ended
	Jun. 30, 2017
Insurance Loss Reserves [Abstract]
Activity In The Reserves For Losses And Loss Adjustment Expenses	The following table presents the activity in loss and loss adjustment expense reserves: Six Months Ended June 30, 2017 2016 (Amounts in thousands) Gross reserves at January 1 $ 1,290,248 $ 1,146,688 Less reinsurance recoverable (13,161 ) (14,253 ) Net reserves at January 1 1,277,087 1,132,435 Incurred losses and loss adjustment expenses related to: Current year 1,181,108 1,127,203 Prior years 14,152 61,965 Total incurred losses and loss adjustment expenses 1,195,260 1,189,168 Loss and loss adjustment expense payments related to: Current year 685,137 650,741 Prior years 471,973 474,124 Total payments 1,157,110 1,124,865 Net reserves at June 30 1,315,237 1,196,738 Reinsurance recoverable 11,726 14,055 Gross reserves at June 30 $ 1,326,963 $ 1,210,793

Notes Payable (Tables)

Notes Payable (Tables)	6 Months Ended
	Jun. 30, 2017
Notes Payable [Abstract]
Schedule of Long-term Debt Instruments	Notes payable consists of the following: Lender Interest Rate Maturity Date June 30, 2017 December 31, 2016 (Amounts in thousands) Secured credit facility (1) Bank of America LIBOR plus 40 basis points December 3, 2018 $ — $ 120,000 Secured loan (1) Union Bank LIBOR plus 40 basis points December 3, 2017 — 20,000 Unsecured credit facility (1) Bank of America and Union Bank LIBOR plus 112.5-162.5 basis points December 3, 2019 — 180,000 Senior unsecured notes (2) Publicly traded 4.40% March 15, 2027 375,000 — Unsecured credit facility (3) Bank of America and Wells Fargo Bank LIBOR plus 112.5-162.5 basis points March 29, 2022 — — Total principal amount 375,000 320,000 Less unamortized discount and debt issuance costs (4) 3,864 — Total debt $ 371,136 $ 320,000 __________ (1) On March 8, 2017, the loan and credit facility agreements were terminated and the Company repaid the total outstanding amounts with the proceeds from its public offering of $375 million of senior notes. (2) On March 8, 2017, the Company completed a public debt offering issuing $375 million of senior notes. The notes are unsecured, senior obligations of the Company with a 4.40% annual coupon payable on March 15 and September 15 of each year commencing September 15, 2017. These notes mature on March 15, 2027. The Company used the proceeds from the notes to pay off amounts outstanding under the existing loan and credit facilities and for general corporate purposes. The Company incurred debt issuance costs of approximately $3.4 million , inclusive of underwriters' fees. The notes were issued at a slight discount of 99.847% of par, resulting in the effective annualized interest rate including debt issuance costs of approximately 4.45% . (3) On March 29, 2017, the Company entered into an unsecured credit agreement that provides for revolving loans of up to $50 million and matures on March 29, 2022. The interest rates on borrowings under the credit facility are based on the Company's debt to total capital ratio and range from LIBOR plus 112.5 basis points when the ratio is under 15% to LIBOR plus 162.5 basis points when the ratio is greater than or equal to 25%. Commitment fees for the undrawn portions of the credit facility range from 12.5 basis points when the ratio is under 15% to 22.5 basis points when the ratio is greater than or equal to 25%. The debt to total capital ratio is expressed as a percentage of (a) consolidated debt to (b) consolidated shareholders' equity plus consolidated debt. The Company's debt to total capital ratio was 17.5% at June 30, 2017 , resulting in a 15 basis point commitment fee on the $50 million undrawn portion of the credit facility. As of July 27, 2017 , there have been no borrowings under this facility. (4) The unamortized discount and debt issuance costs of approximately $3.9 million are associated with the publicly traded $375 million senior unsecured notes. These are amortized to interest expense over the life of the notes, and the unamortized balance is presented in the Company's consolidated balance sheets as a direct deduction from the carrying amount of the debt. The unamortized debt issuance cost of approximately $0.2 million associated with the $50 million five -year unsecured revolving credit facility maturing on March 29, 2022 is included in other assets in the Company's consolidated balance sheets and amortized to interest expense over the term of the credit facility.

Segment Information (Tables)

Segment Information (Tables)	6 Months Ended
	Jun. 30, 2017
Segment Reporting [Abstract]
Reconciliation of operating results by reportable segment	The following tables present the Company's operating results by reportable segment: Three Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Net premiums earned $ 789.0 $ 8.7 $ 797.7 $ 768.6 $ 10.7 $ 779.3 Less: Losses and loss adjustment expenses 584.2 4.4 588.6 589.4 5.7 595.1 Underwriting expenses 187.3 4.0 191.3 193.4 4.2 197.6 Underwriting gain (loss) 17.5 0.3 17.8 (14.2 ) 0.8 (13.4 ) Investment income 31.9 31.5 Net realized investment gains 21.1 45.4 Other income 2.1 1.9 Interest expense (4.2 ) (1.0 ) Pre-tax income $ 68.8 $ 64.3 Net income $ 51.6 $ 48.9 Six Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Net premiums earned $ 1,569.7 $ 17.7 $ 1,587.4 $ 1,524.4 $ 22.0 $ 1,546.4 Less: Losses and loss adjustment expenses 1,186.0 9.3 1,195.3 1,177.4 11.8 1,189.2 Underwriting expenses 391.1 7.9 399.0 391.3 9.1 400.4 Underwriting (loss) gain (7.4 ) 0.5 (6.9 ) (44.3 ) 1.1 (43.2 ) Investment income 63.1 61.1 Net realized investment gains 45.6 70.4 Other income 4.3 4.0 Interest expense (6.7 ) (1.9 ) Pre-tax income $ 99.4 $ 90.4 Net income $ 78.6 $ 72.2
Schedule direct premiums attributable to segment	The following tables present the Company’s net premiums earned and direct premiums written by line of insurance business: Three Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Private passenger automobile $ 617.3 $ — $ 617.3 $ 607.1 $ — $ 607.1 Homeowners 108.3 — 108.3 102.0 — 102.0 Commercial automobile 42.4 — 42.4 39.9 — 39.9 Other 21.0 8.7 29.7 19.6 10.7 30.3 Net premiums earned $ 789.0 $ 8.7 $ 797.7 $ 768.6 $ 10.7 $ 779.3 Private passenger automobile $ 600.1 $ — $ 600.1 $ 595.4 $ — $ 595.4 Homeowners 122.7 — 122.7 116.3 — 116.3 Commercial automobile 45.1 — 45.1 42.4 — 42.4 Other 24.2 8.5 32.7 23.0 6.9 29.9 Direct premiums written $ 792.1 $ 8.5 $ 800.6 $ 777.1 $ 6.9 $ 784.0 Six Months Ended June 30, 2017 June 30, 2016 Property & Casualty Other Total Property & Casualty Other Total (Amounts in millions) Private passenger automobile $ 1,230.5 $ — $ 1,230.5 $ 1,206.1 $ — $ 1,206.1 Homeowners 214.0 — 214.0 201.5 — 201.5 Commercial automobile 83.7 — 83.7 78.6 — 78.6 Other 41.5 17.7 59.2 38.2 22.0 60.2 Net premiums earned $ 1,569.7 $ 17.7 $ 1,587.4 $ 1,524.4 $ 22.0 $ 1,546.4 Private passenger automobile $ 1,239.1 $ — $ 1,239.1 $ 1,227.2 $ — $ 1,227.2 Homeowners 226.5 — 226.5 215.4 — 215.4 Commercial automobile 88.1 — 88.1 83.3 — 83.3 Other 47.0 14.2 61.2 43.9 14.3 58.2 Direct premiums written $ 1,600.7 $ 14.2 $ 1,614.9 $ 1,569.8 $ 14.3 $ 1,584.1

General (Details)

General (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Potentially dilutive securities (in shares)	0	28,000	0	48,000
Deferred policy acquisition cost amortization	$ 137,839	$ 139,922	$ 280,438	$ 281,482
Advertising expenses			$ 20,000	$ 24,000

Recently Issued Accounting St30

Recently Issued Accounting Standards (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Operating lease obligations		$ 27,000
Accounting Standards Update 2016-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Excess tax benefit adjustment	$ 904
Employee taxes paid for withheld shares adjustment	$ 3,200

Fair Value of Financial Instr31

Fair Value of Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 1,829	$ 785
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	1,725	765
Level 2 [Member] | Secured Notes One [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured notes	0	120,000
Level 2 [Member] | Secured Notes Two [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Secured notes	0	20,000
Borrowings [Member] | Unsecured debt [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	380,059	180,000
Borrowings [Member] | Unsecured debt [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured notes	375,000	180,000
Liabilities, fair value	$ 380,059	$ 180,000

Fair Value of Financial Instr32

Fair Value of Financial Instruments (Estimated Fair Values Of Financial Instruments) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Liabilities
Liabilities, fair value	$ 1,829	$ 785
Total Return Swap [Member]
Assets
Total assets, fair value	0	667
Investments [Member]
Assets
Total assets, fair value	3,659,158	3,547,560
Total Return Swap [Member]
Liabilities
Liabilities, fair value	1,725	765
Borrowings [Member] | Secured Debt [Member]
Liabilities
Liabilities, fair value	0	140,000
Borrowings [Member] | Unsecured debt [Member]
Liabilities
Liabilities, fair value	380,059	180,000
Call Option [Member]
Liabilities
Liabilities, fair value	$ 104	$ 20

Fair Value Option (Gains And Lo

Fair Value Option (Gains And Losses Due To Changes In Fair Value Of Investments) (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
(Losses) gains due to changes in fair value of investments	$ 20,275	$ 37,127	$ 42,131	$ 55,658
Fixed maturity securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
(Losses) gains due to changes in fair value of investments	25,622	28,871	35,909	40,434
Equity Securities [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
(Losses) gains due to changes in fair value of investments	(5,080)	8,666	6,462	15,573
Short-term investments [Member]
Schedule of Fair Value of Separate Accounts by Major Category of Investment [Line Items]
(Losses) gains due to changes in fair value of investments	$ (267)	$ (410)	$ (240)	$ (349)

Fair Value Measurement (Narrati

Fair Value Measurement (Narrative) (Details) $ in Thousands	6 Months Ended
	Jun. 30, 2017USD ($)broker	Dec. 31, 2016USD ($)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Percentage of portfolio of unadjusted fair values obtained	99.80%
Percentage of portfolio of specific unadjusted broker quotes obtained	0.20%
Liabilities, fair value	$ 1,829	$ 785
Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, fair value	1,725	765
Commercial Mortgage Backed Securities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Trading securities, fair value disclosure	$ 24,800	30,000
Minimum [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Number of knowledgeable outside security brokers consulted to determine fair value | broker	1
Borrowings [Member] | Unsecured debt [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liabilities, fair value	$ 380,059	180,000
Borrowings [Member] | Unsecured debt [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unsecured notes	375,000	180,000
Liabilities, fair value	380,059	180,000
Secured Notes One [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured notes	0	120,000
Secured Notes Two [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Secured notes	$ 0	$ 20,000

Fair Value Measurement (Schedul

Fair Value Measurement (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis Valuation Techniques) (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	$ 3,659,158	$ 3,548,227
Liabilities, fair value	1,829	785
Notes payable	371,136	320,000
Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	668,300	684,172
Liabilities, fair value	104	20
Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,982,094	2,854,987
Liabilities, fair value	1,725	765
Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	8,764	9,068
Liabilities, fair value	0	0
Fixed maturity securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,952,084	2,814,553
Fixed maturity securities [Member] | U.S. Government Bonds and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	11,735	12,275
Fixed maturity securities [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,603,646	2,449,292
Fixed maturity securities [Member] | Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	33,551	39,777
Fixed maturity securities [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	165,880	189,688
Fixed maturity securities [Member] | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	83,465	86,525
Fixed maturity securities [Member] | Other Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	53,807	36,996
Fixed maturity securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	11,735	12,275
Fixed maturity securities [Member] | Level 1 [Member] | U.S. Government Bonds and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	11,735	12,275
Fixed maturity securities [Member] | Level 1 [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 1 [Member] | Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 1 [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 1 [Member] | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 1 [Member] | Other Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,940,349	2,802,278
Fixed maturity securities [Member] | Level 2 [Member] | U.S. Government Bonds and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 2 [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	2,603,646	2,449,292
Fixed maturity securities [Member] | Level 2 [Member] | Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	33,551	39,777
Fixed maturity securities [Member] | Level 2 [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	165,880	189,688
Fixed maturity securities [Member] | Level 2 [Member] | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	83,465	86,525
Fixed maturity securities [Member] | Level 2 [Member] | Other Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	53,807	36,996
Fixed maturity securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | U.S. Government Bonds and Agencies [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | Municipal Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | Mortgage Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | Corporate Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | Collateralized Loan Obligations [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Fixed maturity securities [Member] | Level 3 [Member] | Other Asset-Backed Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	427,029	357,327
Equity Securities [Member] | Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	392,514	316,450
Equity Securities [Member] | Nonredeemable Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	25,751	31,809
Equity Securities [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	8,764	9,068
Equity Securities [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	392,514	316,450
Equity Securities [Member] | Level 1 [Member] | Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	392,514	316,450
Equity Securities [Member] | Level 1 [Member] | Nonredeemable Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 1 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	25,751	31,809
Equity Securities [Member] | Level 2 [Member] | Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 2 [Member] | Nonredeemable Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	25,751	31,809
Equity Securities [Member] | Level 2 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	8,764	9,068
Equity Securities [Member] | Level 3 [Member] | Common Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 3 [Member] | Nonredeemable Preferred Stock [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Equity Securities [Member] | Level 3 [Member] | Private Equity Funds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	8,764	9,068
Short-term Investments [Member] | Short-term Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	45,991	90,626
Short-term Investments [Member] | Level 1 [Member] | Short-term Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	29,997	70,393
Short-term Investments [Member] | Level 2 [Member] | Short-term Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	15,994	20,233
Short-term Investments [Member] | Level 3 [Member] | Short-term Bonds [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Money Market Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	280,045	375,680
Money Market Instruments [Member] | Money Market Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	234,054	285,054
Money Market Instruments [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	264,051	355,447
Money Market Instruments [Member] | Level 1 [Member] | Money Market Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	234,054	285,054
Money Market Instruments [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	15,994	20,233
Money Market Instruments [Member] | Level 2 [Member] | Money Market Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Money Market Instruments [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Money Market Instruments [Member] | Level 3 [Member] | Money Market Instruments [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value	0	0
Total Return Swap [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		667
Liabilities, fair value	1,725	765
Total Return Swap [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		0
Liabilities, fair value	0	0
Total Return Swap [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		667
Liabilities, fair value	1,725	765
Total Return Swap [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Assets, fair value		0
Liabilities, fair value	0	0
Equity contracts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	104	20
Equity contracts [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	104	20
Equity contracts [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	0	0
Equity contracts [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	0	0
Unsecured debt [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	380,059	180,000
Notes payable	371,136	180,000
Unsecured debt [Member] | Borrowings [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	0	0
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	380,059	180,000
Unsecured debt [Member] | Borrowings [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	0	0
Secured Debt [Member] | Borrowings [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value	$ 0	140,000
Notes payable		140,000
Secured Debt [Member] | Borrowings [Member] | Level 1 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value		0
Secured Debt [Member] | Borrowings [Member] | Level 2 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value		140,000
Secured Debt [Member] | Borrowings [Member] | Level 3 [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Liabilities, fair value		$ 0

Fair Value Measurement (Summary

Fair Value Measurement (Summary Of Changes In Fair Value Of Level 3 Financial Assets And Financial Liabilities Held At Fair Value) (Details) - Private Equity Funds [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]
Beginning Balance	$ 9,018	$ 8,991	$ 9,068	$ 10,431
Realized losses included in earnings	(254)	(19)	(304)	(1,459)
Ending Balance	8,764	8,972	8,764	8,972
The amount of total losses for the period included in earnings attributable to assets still held at June 30	$ (254)	$ (19)	$ (304)	$ (1,459)

Derivative Financial Instrume37

Derivative Financial Instruments (Narrative) (Details) - Swap [Member] - USD ($) $ in Millions	Feb. 13, 2014	Aug. 09, 2013	Jun. 30, 2017	Dec. 31, 2016	Jan. 31, 2017
FFL [Member]
Debt Instrument [Line Items]
Swap agreement collateral			$ 30
Notional amount			$ 104	$ 108
Term of swap agreement	1 year		1 year	1 year
FFL [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.45%		1.28%	1.45%	1.28%
AFL [Member]
Debt Instrument [Line Items]
Swap agreement collateral			$ 40
Notional amount				$ 152
Term of swap agreement		3 years	1 year	1 year
AFL [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate		1.35%	1.28%	1.35%	1.28%

Derivative Financial Instrume38

Derivative Financial Instruments (Summary Of Location And Amounts Of Derivative Fair Values In The Consolidated Balance Sheets) (Details) - Non-hedging derivatives [Member] - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Derivative [Line Items]
Asset Derivatives	$ 0	$ 667
Liability Derivatives	1,829	785
Total Return Swap [Member] | Other Assets [Member]
Derivative [Line Items]
Asset Derivatives	0	667
Liability Derivatives	0	0
Total Return Swap [Member] | Other liabilities [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Liability Derivatives	1,725	765
Option contracts [Member] | Other liabilities [Member]
Derivative [Line Items]
Asset Derivatives	0	0
Liability Derivatives	$ 104	$ 20

Derivative Financial Instrume39

Derivative Financial Instruments (Schedule Of Derivative Gains And Losses In The Consolidated Statements Of Operations) (Details) - Derivatives Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Derivative [Line Items]
Gain Recognized in Income (Loss)	$ (629)	$ 3,931	$ (1,353)	$ 6,038
Total Return Swap [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gain Recognized in Income (Loss)	(1,634)	2,581	(2,654)	3,744
Equity contracts [Member] | Net realized investment (losses) gains [Member]
Derivative [Line Items]
Gain Recognized in Income (Loss)	$ 1,005	$ 1,350	$ 1,301	$ 2,294

Goodwill and Other Intangible40

Goodwill and Other Intangible Assets (Narrative) (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Goodwill and Intangible Assets Disclosure [Abstract]
Change in Goodwill	$ 0	$ 0	$ 0	$ 0
Goodwill, impairment	0	0	0	0
Intangible assets amortization expense	$ 1,300,000	$ 1,500,000	$ 2,700,000	$ 3,000,000

Goodwill and Other Intangible41

Goodwill and Other Intangible Assets (Schedule Of Components Of Other Intangible Assets) (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2017	Dec. 31, 2016
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 73,530	$ 73,530
Accumulated Amortization	(50,581)	(47,905)
Total	22,949	25,625
Customer relationships [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	52,430	52,430
Accumulated Amortization	(41,472)	(39,332)
Total	$ 10,958	$ 13,098
Useful Lives (in years)	11 years	11 years
Trade names [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 15,400	$ 15,400
Accumulated Amortization	(5,454)	(5,133)
Total	$ 9,946	$ 10,267
Useful Lives (in years)	24 years	24 years
Technology [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 4,300	$ 4,300
Accumulated Amortization	(3,655)	(3,440)
Total	$ 645	$ 860
Useful Lives (in years)	10 years	10 years
Licensing Agreements [Member]
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 1,400	$ 1,400
Total	$ 1,400	$ 1,400

Goodwill and Other Intangible42

Goodwill and Other Intangible Assets (Schedule Of Estimated Future Amortization Expense Related To Intangible Assets) (Details) $ in Thousands	Jun. 30, 2017USD ($)
Goodwill and Intangible Assets Disclosure [Abstract]
Remainder of 2017	$ 2,673
2,018	5,335
2,019	4,905
2,020	758
2,021	738
Thereafter	7,140
Total	$ 21,549

Share-Based Compensation (Narra

Share-Based Compensation (Narrative) (Details) - USD ($) $ in Millions	1 Months Ended		6 Months Ended
	Mar. 31, 2017	Feb. 29, 2016	Jun. 30, 2017	Feb. 28, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period of restricted stock units (in years)			3 years
Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares issued during period		88,074
Shares withheld for payroll taxes			58,822
Incentive Award Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares authorized				4,900,000
Incentive Award Plan 2015 [Member] | Common Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares available for grant			4,715,500
Shares issued during period			0
Target Restricted Stock Units, 2016 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested options forfeited			5,000
Target Restricted Stock Units, 2015 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Nonvested options forfeited			5,500
Employee Stock Option [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Option vesting term (in years)			10 years
Restricted Stock [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
RSUs vested during period		146,896
Restricted Stock [Member] | Incentive Award Plan 2015 [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of nonvested shares			184,500
Restricted Stock [Member] | Target Restricted Stock Units, 2014 Grants [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares vested in period, amount	$ 3.6
RSUs vested during period	61,445

Share-Based Compensation (Sched

Share-Based Compensation (Schedule Of Performance Vesting Restricted Stock Units Granted) (Details) - shares	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Share-based Compensation, Allocation and Classification in Financial Statements [Abstract]
Three-year performance period ending December 31,	2,018	2,017
Vesting shares, target	90,750	93,750
Vesting shares, maximum	170,156	175,781

Income Taxes (Details)

Income Taxes (Details) $ in Millions	6 Months Ended
	Jun. 30, 2017USD ($)
Components of Income Tax Expense (Benefit), Continuing Operations [Abstract]
Increase in unrecognized tax benefit	$ 0.3

Losses And Loss Adjustment Ex46

Losses And Loss Adjustment Expense Reserves (Narrative) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016
Unusual or Infrequent Item, or Both [Line Items]
Prior years claims and claim adjustment expense	$ 14,152	$ 61,965
Catastrophe [Member]
Unusual or Infrequent Item, or Both [Line Items]
Pre-tax catastrophe losses	$ 40,000	$ 19,000

Losses And Loss Adjustment Ex47

Losses And Loss Adjustment Expense Reserves (Activity In The Reserves For Losses And Loss Adjustment Expenses) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Dec. 31, 2016	Dec. 31, 2015
Liability for Unpaid Claims and Claims Adjustment Expense [Roll Forward]
Gross reserves at January 1	$ 1,290,248	$ 1,146,688
Reissuance recoverable	11,726	14,055	$ 13,161	$ 14,253
Net reserves at January 1	1,277,087	1,132,435
Incurred losses and loss adjustment expense related to:
Current year	1,181,108	1,127,203
Prior years claims and claim adjustment expense	14,152	61,965
Total incurred losses and loss adjustment expenses	1,195,260	1,189,168
Loss and loss adjustment expense payments related to:
Current year	685,137	650,741
Prior years	471,973	474,124
Total payments	1,157,110	1,124,865
Net reserves at year-end	1,315,237	1,196,738
Gross reserves at year-end	$ 1,326,963	$ 1,210,793

Notes Payable (Narrative) (Deta

Notes Payable (Narrative) (Details)	Mar. 29, 2017USD ($)	Mar. 08, 2017USD ($)	Jun. 30, 2017USD ($)	Dec. 31, 2016USD ($)
Debt Instrument [Line Items]
Less unamortized discount and debt issuance costs			$ 3,864,000	$ 0
Document Period End Date			Jun. 30, 2017
Unsecured debt [Member]
Debt Instrument [Line Items]
Gross proceeds from issuance of senior notes		$ 375,000,000
Interest rate		4.40%
Debt issuance cost		$ 3,400,000
Debt instrument, discount percent		99.847%
Effective interest rate		4.45%
Secured Notes Two [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Loan maximum borrowing capacity	$ 50,000,000
Revolving credit facility term	5 years
Secured Notes Two [Member] | Revolving Credit Facility [Member] | Minimum [Member]
Debt Instrument [Line Items]
Debt to total capital ratio	0.15
Commitment fee on undrawn portion of facility	0.125%		0.15%
Secured Notes Two [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt to total capital ratio	0.25
Commitment fee on undrawn portion of facility	0.225%
Secured Notes Two [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.125%
Debt to total capital ratio	0.15
Secured Notes Two [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	1.625%
Debt to total capital ratio	0.25
Unsecured Notes Three [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Loan maximum borrowing capacity	$ 50,000,000
Revolving credit facility term	5 years
Unamortized debt issuance cost	$ 200,000
Unsecured Notes Three [Member] | Revolving Credit Facility [Member] | Maximum [Member]
Debt Instrument [Line Items]
Debt to total capital ratio			0.175
Level 2 [Member] | Secured Notes Two [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.40%
Level 2 [Member] | Borrowings [Member] | Unsecured Notes Two [Member] | Unsecured debt [Member]
Debt Instrument [Line Items]
Unsecured debt		$ 375,000,000	$ 375,000,000	$ 0
Interest rate			4.40%
Less unamortized discount and debt issuance costs			$ 3,900,000
Level 2 [Member] | Borrowings [Member] | Unsecured Notes Three [Member] | Unsecured debt [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.1125%
Level 2 [Member] | Borrowings [Member] | Unsecured Notes Three [Member] | Unsecured debt [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Basis spread on variable rate			0.1625%

Notes Payable (Schedule of Long

Notes Payable (Schedule of Long-term Debt) (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2017	Mar. 08, 2017	Dec. 31, 2016
Debt Instrument [Line Items]
Document Period End Date	Jun. 30, 2017
Liabilities, fair value	$ 1,829		$ 785
Total principal amount	375,000		320,000
Less unamortized discount and debt issuance costs(4)	3,864		0
Notes payable	371,136		320,000
Level 2 [Member]
Debt Instrument [Line Items]
Liabilities, fair value	1,725		765
Level 2 [Member] | Secured Notes One [Member]
Debt Instrument [Line Items]
Secured notes	0		120,000
Level 2 [Member] | Secured Notes Two [Member]
Debt Instrument [Line Items]
Secured notes	0		20,000
Unsecured debt [Member]
Debt Instrument [Line Items]
Interest rate		4.40%
Unsecured debt [Member] | Borrowings [Member]
Debt Instrument [Line Items]
Liabilities, fair value	380,059		180,000
Notes payable	371,136		180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Liabilities, fair value	380,059		180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Liabilities, fair value	$ 0		180,000
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Two [Member]
Debt Instrument [Line Items]
Interest rate	4.40%
Unsecured debt	$ 375,000	$ 375,000	0
Less unamortized discount and debt issuance costs(4)	3,900
Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Liabilities, fair value	$ 0		$ 0
LIBOR [Member] | Level 2 [Member] | Secured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.40%
LIBOR [Member] | Level 2 [Member] | Secured Notes Two [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.40%
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1125%
LIBOR [Member] | Minimum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1125%
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes One [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1625%
LIBOR [Member] | Maximum [Member] | Unsecured debt [Member] | Borrowings [Member] | Level 2 [Member] | Unsecured Notes Three [Member]
Debt Instrument [Line Items]
Basis spread on variable rate	0.1625%

Contingencies - Loss Contingenc

Contingencies - Loss Contingencies (Details) - California DOI [Member] - USD ($) $ in Millions	Feb. 09, 2015	Mar. 31, 2015	Nov. 17, 2016
Loss Contingencies [Line Items]
Litigation, penalty assessed	$ 27.6
Payments for assessed penalty		$ 27.6
Penalty interest assessed, statutory rate			7.00%

Contingencies - Gain Contingenc

Contingencies - Gain Contingencies (Details) $ in Millions	Jun. 30, 2017USD ($)
Other liabilities [Member]
Gain Contingencies [Line Items]
Gain contingency	$ 30.9

Segment Information - Summary o

Segment Information - Summary of Operating Results by Segment (Details) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017USD ($)State	Jun. 30, 2016USD ($)	Jun. 30, 2017USD ($)SubsidiaryState	Jun. 30, 2016USD ($)
Segment Reporting [Abstract]
Number of insurance companies | Subsidiary			14
Number of states in which company operates | State	11		11
Segment Reporting Information [Line Items]
Net premiums earned	$ 797,700	$ 779,300	$ 1,587,400	$ 1,546,400
Losses and loss adjustment expenses	588,595	595,086	1,195,260	1,189,168
Underwriting expenses	191,300	197,600	399,000	400,400
Underwriting gain	17,800	(13,400)	(6,900)	(43,200)
Net investment income	31,901	31,414	63,070	61,069
Net realized investment gains	21,156	45,381	45,616	70,438
Other	2,124	1,887	4,229	4,010
Interest Expense	(4,229)	(960)	(6,682)	(1,910)
Pre-tax income	68,752	64,335	99,351	90,369
Net income	51,633	48,873	78,613	72,196
Property and Casualty Lines [Member]
Segment Reporting Information [Line Items]
Net premiums earned	789,000	768,600	1,569,700	1,524,400
Losses and loss adjustment expenses	584,200	589,400	1,186,000	1,177,400
Underwriting expenses	187,300	193,400	391,100	391,300
Underwriting gain	17,500	(14,200)	(7,400)	(44,300)
Other Segments [Member]
Segment Reporting Information [Line Items]
Net premiums earned	8,700	10,700	17,700	22,000
Losses and loss adjustment expenses	4,400	5,700	9,300	11,800
Underwriting expenses	4,000	4,200	7,900	9,100
Underwriting gain	$ 300	$ 800	$ 500	$ 1,100

Segment Information - Summary53

Segment Information - Summary of Premiums Written and Earned by Segment (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Segment Reporting Information [Line Items]
Document Period End Date			Jun. 30, 2017
Net premiums earned	$ 797.7	$ 779.3	$ 1,587.4	$ 1,546.4
Direct Premiums Written	800.6	784	1,614.9	1,584.1
Private Passenger Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	617.3	607.1	1,230.5	1,206.1
Direct Premiums Written	600.1	595.4	1,239.1	1,227.2
Homeowners Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	108.3	102	214	201.5
Direct Premiums Written	122.7	116.3	226.5	215.4
Commercial Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	42.4	39.9	83.7	78.6
Direct Premiums Written	45.1	42.4	88.1	83.3
Other [Member]
Segment Reporting Information [Line Items]
Net premiums earned	29.7	30.3	59.2	60.2
Direct Premiums Written	32.7	29.9	61.2	58.2
Property and Casualty Lines [Member]
Segment Reporting Information [Line Items]
Net premiums earned	789	768.6	1,569.7	1,524.4
Direct Premiums Written	792.1	777.1	1,600.7	1,569.8
Property and Casualty Lines [Member] | Private Passenger Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	617.3	607.1	1,230.5	1,206.1
Direct Premiums Written	600.1	595.4	1,239.1	1,227.2
Property and Casualty Lines [Member] | Homeowners Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	108.3	102	214	201.5
Direct Premiums Written	122.7	116.3	226.5	215.4
Property and Casualty Lines [Member] | Commercial Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	42.4	39.9	83.7	78.6
Direct Premiums Written	45.1	42.4	88.1	83.3
Property and Casualty Lines [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net premiums earned	21	19.6	41.5	38.2
Direct Premiums Written	24.2	23	47	43.9
Other Segments [Member]
Segment Reporting Information [Line Items]
Net premiums earned	8.7	10.7	17.7	22
Direct Premiums Written	8.5	6.9	14.2	14.3
Other Segments [Member] | Private Passenger Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Direct Premiums Written	0	0	0	0
Other Segments [Member] | Homeowners Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Direct Premiums Written	0	0	0	0
Other Segments [Member] | Commercial Automobile Line [Member]
Segment Reporting Information [Line Items]
Net premiums earned	0	0	0	0
Direct Premiums Written	0	0	0	0
Other Segments [Member] | Other [Member]
Segment Reporting Information [Line Items]
Net premiums earned	8.7	10.7	17.7	22
Direct Premiums Written	$ 8.5	$ 6.9	$ 14.2	$ 14.3