General	6 Months Ended
Jun. 30, 2018
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, 2017. 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, 2018 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, 2017 for more complete descriptions and discussions. Operating results and cash flows for the six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018. 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, 2017. Earnings per Share Potentially dilutive securities representing approximately 85,000 and 71,000 shares of common stock were excluded from the computation of diluted earnings per common share for the three and six months ended June 30, 2018, respectively, 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 $141.5 million and $137.8 million for the three months ended June 30, 2018 and 2017, respectively, and $282.5 million and $280.4 million for the six months ended June 30, 2018 and 2017, respectively. The Company does not defer advertising expenditures but expenses them as incurred. The Company recorded net advertising expense of approximately $23 million and $20 million for the six months ended June 30, 2018 and 2017, respectively. Revenue from Contracts with Customers On January 1, 2018, the Company adopted Topic 606, Revenue from Contracts with Customers, using the modified retrospective transition method. The Company had no cumulative-effect adjustment and its consolidated financial statement line items were not impacted as a result of the adoption, mostly because the accounting for insurance contracts was outside of the scope of Topic 606 and the application of the key aspects of revenue recognition of Topic 606 to the Company's in-scope transactions, such as the timing of recognition of revenue (at a point in time vs. over time) and the estimation of refund liability, resulted in recognition of revenues and related expenses consistent with that under the legacy accounting guide, Topic 605. The Company's total revenue from contracts with customers that are in scope of Topic 606 amounted to approximately $15.2 million with related expenses of $10.2 million for the year ended December 31, 2017. This revenue represents the commission income that the Company's 100% owned insurance agencies, Auto Insurance Specialists LLC ("AIS") and PoliSeek AIS Insurance Solutions, Inc. ("Poliseek"), earned from third-party insurers, and accounted for approximately 0.4% of the total consolidated revenue in 2017. The Company's commission income from third-party insurers was approximately $8.3 million and $7.7 million representing approximately 0.5% and 0.5% of the consolidated total revenue, with related expenses of $5.4 million and $5.3 million, for the six months ended June 30, 2018 and 2017, respectively. Due to the immateriality of the Company's commission income and its related expenses to the overall consolidated financial statements, the commission income, net of related expenses, is included in other revenues in the Company's consolidated statements of operations, and in other income of the Property and Casualty business segment in the Company's segment reporting in accordance with Topic 280, Segment Reporting (see Note 13. Segment Information). AIS and PoliSeek are primarily engaged in the marketing and sales of insurance policies in private passenger automobile, commercial automobile and homeowners lines of business. Their revenues primarily consist of commission income received from property and casualty insurers. Approximately 80% of their total revenue is generated from sales of policies issued by the Company's insurance subsidiaries, which are eliminated as intercompany transactions in consolidation, with the remaining from sales of policies issued by third-party property and casualty insurers. The primary performance obligation of AIS and Poliseek in return for the commission income from the insurers is to complete the sale of the policy and deliver the control of the policy to the insurer prior to the policy effective date. In addition, AIS and PoliSeek provide administrative services to the insurer or the policyholder subsequent to the sale of the policy as needed, including processing of endorsements, collection of premiums, and answering general questions concerning the policyholder's account. The administrative services and the costs to perform such services are deemed immaterial in the context of the contract and to the Company's consolidated financial statements, and hence, such services are not identified as a separate performance obligation and the costs to perform such services are not accrued at the time of the sale of the policy but are expensed as incurred as part of the overall operating expenses. The total revenue from the sale of a policy is recognized when the sale is complete and the policy is effective as all the material aspects of the performance obligation are satisfied and the insurer is deemed to obtain control of the insurance policy at that time. The commission income is constrained such that the revenue is recognized only to the extent that the commission income received is not likely to be returned to the insurers due to policy cancellations. Any commission income not received when the sale is complete is recognized as commission income receivable, which is included in other receivables in the Company's consolidated balance sheets. The commission income receivable at June 30, 2018 and December 31, 2017 was $1.1 million and $1.2 million, respectively. A refund liability is recorded for the expected amount of the commission income that has to be returned to the insurers based on estimated policy cancellations. The refund liability is computed for the entire portfolio of contracts as a practical expedient, rather than for each contract or performance obligation. The estimated policy cancellations and the resulting refund liability are computed using the expected value method based on all relevant information, including historical data. The refund liability at June 30, 2018 and December 31, 2017 was $0.7 million, which was included in other liabilities in the Company's consolidated balance sheets. As of June 30, 2018 and December 31, 2017, the Company had no contract assets, contract liabilities, or capitalized costs to obtain or fulfill a contract, associated with revenues from contracts with customers.

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, 2017. 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, 2018 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, 2017 for more complete descriptions and discussions. Operating results and cash flows for the six months ended June 30, 2018 are not necessarily indicative of the results that may be expected for the year ending December 31, 2018.

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, 2017.

Earnings per Share

Potentially dilutive securities representing approximately 85,000 and 71,000 shares of common stock were excluded from the computation of diluted earnings per common share for the three and six months ended June 30, 2018, respectively, 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 $141.5 million and $137.8 million for the three months ended June 30, 2018 and 2017, respectively, and $282.5 million and $280.4 million for the six months ended June 30, 2018 and 2017, respectively. The Company does not defer advertising expenditures but expenses them as incurred. The Company recorded net advertising expense of approximately $23 million and $20 million for the six months ended June 30, 2018 and 2017, respectively.

Revenue from Contracts with Customers

On January 1, 2018, the Company adopted Topic 606, Revenue from Contracts with Customers, using the modified retrospective transition method. The Company had no cumulative-effect adjustment and its consolidated financial statement line items were not impacted as a result of the adoption, mostly because the accounting for insurance contracts was outside of the scope of Topic 606 and the application of the key aspects of revenue recognition of Topic 606 to the Company's in-scope transactions, such as the timing of recognition of revenue (at a point in time vs. over time) and the estimation of refund liability, resulted in recognition of revenues and related expenses consistent with that under the legacy accounting guide, Topic 605.

The Company's total revenue from contracts with customers that are in scope of Topic 606 amounted to approximately $15.2 million with related expenses of $10.2 million for the year ended December 31, 2017. This revenue represents the commission income that the Company's 100% owned insurance agencies, Auto Insurance Specialists LLC ("AIS") and PoliSeek AIS Insurance Solutions, Inc. ("Poliseek"), earned from third-party insurers, and accounted for approximately 0.4% of the total consolidated revenue in 2017. The Company's commission income from third-party insurers was approximately $8.3 million and $7.7 million representing approximately 0.5% and 0.5% of the consolidated total revenue, with related expenses of $5.4 million and $5.3 million, for the six months ended June 30, 2018 and 2017, respectively. Due to the immateriality of the Company's commission income and its related expenses to the overall consolidated financial statements, the commission income, net of related expenses, is included in other revenues in the Company's consolidated statements of operations, and in other income of the Property and Casualty business segment in the Company's segment reporting in accordance with Topic 280, Segment Reporting (see Note 13. Segment Information).

AIS and PoliSeek are primarily engaged in the marketing and sales of insurance policies in private passenger automobile, commercial automobile and homeowners lines of business. Their revenues primarily consist of commission income received from property and casualty insurers. Approximately 80% of their total revenue is generated from sales of policies issued by the Company's insurance subsidiaries, which are eliminated as intercompany transactions in consolidation, with the remaining from sales of policies issued by third-party property and casualty insurers. The primary performance obligation of AIS and Poliseek in return for the commission income from the insurers is to complete the sale of the policy and deliver the control of the policy to the insurer prior to the policy effective date. In addition, AIS and PoliSeek provide administrative services to the insurer or the policyholder subsequent to the sale of the policy as needed, including processing of endorsements, collection of premiums, and answering general questions concerning the policyholder's account. The administrative services and the costs to perform such services are deemed immaterial in the context of the contract and to the Company's consolidated financial statements, and hence, such services are not identified as a separate performance obligation and the costs to perform such services are not accrued at the time of the sale of the policy but are expensed as incurred as part of the overall operating expenses.

The total revenue from the sale of a policy is recognized when the sale is complete and the policy is effective as all the material aspects of the performance obligation are satisfied and the insurer is deemed to obtain control of the insurance policy at that time. The commission income is constrained such that the revenue is recognized only to the extent that the commission income received is not likely to be returned to the insurers due to policy cancellations. Any commission income not received when the sale is complete is recognized as commission income receivable, which is included in other receivables in the Company's consolidated balance sheets. The commission income receivable at June 30, 2018 and December 31, 2017 was $1.1 million and $1.2 million, respectively.

A refund liability is recorded for the expected amount of the commission income that has to be returned to the insurers based on estimated policy cancellations. The refund liability is computed for the entire portfolio of contracts as a practical expedient, rather than for each contract or performance obligation. The estimated policy cancellations and the resulting refund liability are computed using the expected value method based on all relevant information, including historical data. The refund liability at June 30, 2018 and December 31, 2017 was $0.7 million, which was included in other liabilities in the Company's consolidated balance sheets.

As of June 30, 2018 and December 31, 2017, the Company had no contract assets, contract liabilities, or capitalized costs to obtain or fulfill a contract, associated with revenues from contracts with customers.