Summary of Significant Accounting Policies and Estimates (Policies)	12 Months Ended
	Dec. 31, 2018
Accounting Policies [Abstract]
Use of Estimates	Use of Estimates The preparation of the Company’s financial statements in conformity with accounting principles generally accepted in the U.S. (“U.S. GAAP”) requires management to make certain estimates and assumptions. These estimates and assumptions affect the reported amounts of assets and liabilities, the disclosures of contingent assets and liabilities at the balance sheet date and the amounts of revenues and expenses recognized during the reporting period. Management analyzes the Company’s estimates based on historical experience and various other assumptions that are believed to be reasonable under the circumstances; however, actual results could differ from such estimates. The significant estimates made by management in the accompanying Consolidated Financial Statements relate to inventory market adjustments, reserves for future chargebacks on finance and vehicle service contract fees, self-insured property/casualty insurance exposure, the fair value of assets acquired and liabilities assumed in business combinations, the valuation of goodwill and intangible franchise rights, and reserves for potential litigation.
Basis of Presentation	Basis of Presentation All business acquisitions completed during the periods presented have been accounted by applying the acquisition method of accounting, and their results of operations are included from the effective dates of the closings of the acquisitions. The allocations of purchase price to the assets acquired and liabilities assumed are assigned and recorded based on estimates of fair value and are subject to change within the purchase price allocation period (generally one year from the respective acquisition date). All intercompany balances and transactions have been eliminated in consolidation.
Business Segment Information	Business Segment Information The Company, through its regions, conducts business in the automotive retailing industry, including selling new and used cars and light trucks, arranging related vehicle financing, selling service and insurance contracts, providing automotive maintenance and repair services and selling vehicle parts. The Company has three reportable segments: the U.S., which includes the activities of the Company’s corporate office, the U.K., and Brazil. The reportable segments are the business activities of the Company for which discrete financial information is available and for which operating results are regularly reviewed by its chief operating decision maker to allocate resources and assess performance. The Company’s chief operating decision maker is its Chief Executive Officer.
Cash and Cash Equivalents	Cash and Cash Equivalents Cash and cash equivalents include demand deposits and various other short-term investments with original maturities of three months or less at the date of purchase. As of December 31, 2018 and 2017, cash and cash equivalents excluded $33.7 million and $109.0 million, respectively, of immediately available funds used to pay down the Floorplan Line of the Revolving Credit Facility and the FMCC Facility (as defined in Note 12, “Credit Facilities”), which are the Company’s primary options for the short-term investment of excess cash. These amounts are reflected in the Company’s Consolidated Balance Sheets as the offset accounts related to Floorplan Notes Payable - Credit Facility and Floorplan Notes Payable - Manufacturer Affiliates.
Contracts-in-Transit and Vehicle Receivables	Contracts-in-Transit and Vehicle Receivables Contracts-in-transit and vehicle receivables consist primarily of amounts due from financing institutions on retail finance contracts from vehicle sales and dealer incentives due from manufacturers. Also included are amounts receivable from vehicle wholesale sales.
Inventories	Inventories New, used and demonstrator vehicle inventories are carried at the lower of specific cost or net realizable value and are removed from inventory using the specific identification method in the Consolidated Balance Sheets. Vehicle inventory cost consists of the amount paid to acquire the inventory, plus the cost of reconditioning, cost of equipment added and transportation cost. Additionally, the Company receives interest assistance from some of the automobile manufacturers. This assistance is accounted for as a vehicle purchase price discount and is reflected as a reduction to the inventory cost on the Company’s Consolidated Balance Sheets and as a reduction to cost of sales in its Statements of Operations as the vehicles are sold. At December 31, 2018 and 2017, inventory cost had been reduced by $9.7 million and $9.1 million, respectively, for interest assistance received from manufacturers. New vehicle cost of sales was reduced by $47.3 million, $48.9 million and $49.2 million for interest assistance received related to vehicles sold for the years ended December 31, 2018, 2017 and 2016, respectively. The interest assistance over the past three years has ranged from approximately 77.1% of the Company’s quarterly floorplan interest expense in the fourth quarter of 2018 to 116.6% for the third quarter of 2016. Since the market value of inventory typically declines over time, the Company establishes new and used vehicle reserves based on its historical loss experience and management’s considerations of current market trends. These reserves are charged to cost of sales and reduce the carrying value of inventory on hand. Used vehicles are complex to value as there is no standardized source for determining exact values and each vehicle and each market in which the Company operates is unique. As a result, the value of each used vehicle taken at trade-in, or purchased at auction, is determined based on industry data, primarily accessed via the Company’s used vehicle management software and the industry expertise of the responsible used vehicle manager. Valuation risk is partially mitigated by the speed at which the Company turns this inventory. At December 31, 2018 and 2017, the Company’s used vehicle days’ supply was 39 days. Parts and accessories inventories are valued at lower of cost (determined on a first-in, first-out basis) or net realizable value in the Consolidated Balance Sheets. The Company incurs shipping costs in connection with selling parts to customers. The cost of shipping these parts is included in cost of sales on the Consolidated Statements of Operations.
Property and Equipment	Property and Equipment Property and equipment are recorded at cost and depreciation is provided using the straight-line method over the estimated useful lives of the assets. Leasehold improvements are capitalized and amortized over the lesser of the estimated term of the lease or the estimated useful life of the asset. The amortization of assets recorded under capital leases is included with depreciation and amortization expense in the Consolidated Statement of Operations. Expenditures for major additions or improvements, which extend the useful lives of assets, are capitalized. Minor replacements, maintenance and repairs, which do not improve or extend the lives of the assets, are expensed as incurred. Disposals are removed at cost less accumulated depreciation, and any resulting gain or loss is reflected in current operations. The Company reviews long-lived assets that are held-for-use for impairment at the lowest level of identifiable cash flows whenever there is evidence that the carrying value of these assets may not be recoverable (i.e., triggering events). This review consists of comparing the carrying amount of the asset with its expected future undiscounted cash flows without interest costs. If the asset’s carrying amount is greater than such cash flow estimate, then it is required to be written down to its fair value. Estimates of expected future cash flows represent management’s best estimate based on currently available information and reasonable and supportable assumptions. See Note 16, “Asset Impairments”, for additional details regarding the Company’s impairment of long-lived assets.
Goodwill	Goodwill Goodwill represents the excess, at the date of acquisition, of the purchase price of the business acquired over the fair value of the net tangible and intangible assets acquired. The Company is organized into three geographic regions, the U.S. region, the U.K. region and the Brazil region. The Company has determined that each region represents a reporting unit for the purpose of assessing goodwill for impairment. Annually in the fourth quarter, based on the carrying values of the Company’s regions as of October 31, the Company performs a fair value and potential impairment assessment of its goodwill. An impairment analysis is done more frequently if certain events or circumstances arise that would indicate an adverse change in the fair value of the intangible asset has occurred (i.e., an impairment indicator). In evaluating its goodwill, the Company compares the carrying value of the net assets of each reporting unit to its respective fair value, which is calculated by using unobservable inputs based upon the Company’s internally developed estimates of market participants’ assumptions. This represents the first step of the impairment test. If the fair value of a reporting unit is less than the carrying value of its net assets, the Company proceeds to step two of the impairment test. Step two involves allocating the calculated fair value to all of the tangible and identifiable intangible assets of the reporting unit as if the calculated fair value were the purchase price in a business combination. The Company then compares the value of the implied goodwill resulting from this second step to the carrying value of the goodwill in the reporting unit. To the extent the carrying value of the goodwill exceeds its implied fair value under step two of the impairment test, a non-cash impairment charge equal to the difference is recorded. The Company uses a combination of the discounted cash flow, or income approach (80% weighted), and the market approach (20% weighted) to determine the fair value of the Company’s reporting units. Included in the discounted cash flow approach are assumptions regarding revenue growth rates, future gross margins, future selling, general and administrative expenses (“SG&A”) and an estimated weighted average cost of capital (“WACC”). The Company also must estimate residual values at the end of the forecast period and future capital expenditure requirements. Specifically, with regard to the valuation assumptions utilized in the income approach for the U.S. reporting unit (which represents the Company’s largest reporting unit) as of October 31, 2018, the Company based its analysis on an estimate of industry sales of 16.8 million units in 2019, 16.7 million units in 2020 and declining approximately one hundred thousand units annually for the remainder of the forecasted years. For the market approach, the Company utilizes recent market multiples of guideline companies for both revenue and pretax net income weighted as appropriate by reporting unit. Each of these assumptions requires the Company to use its knowledge of (1) the industry, (2) recent transactions and (3) reasonable performance expectations for its operations. If any one of the above assumptions change or fails to materialize, the resulting decline in the estimated fair value could result in a material, non-cash impairment charge to the goodwill associated with the reporting unit(s). See Note 16, "Asset Impairments” and Note 17, “Intangible Franchise Rights and Goodwill”, for additional details regarding the Company’s goodwill.
Intangible Franchise Rights	Intangible Franchise Rights The Company’s only significant identifiable intangible assets, other than goodwill, are rights under franchise agreements with manufacturers, which are recorded at an individual dealership level. The Company expects these franchise agreements to continue for an indefinite period and, for agreements that do not have indefinite terms, the Company believes that renewal of these agreements can be obtained without substantial cost, based on the history with the manufacturer. As such, the Company believes that its franchise agreements will contribute to cash flows for an indefinite period and, therefore, the carrying amounts of the franchise rights are not amortized. Franchise rights acquired in business acquisitions prior to July 1, 2001, were recorded and amortized as part of goodwill in the U.S. reporting unit and remain as part of goodwill in the U.S. reporting unit at December 31, 2018 and 2017 in the accompanying Consolidated Balance Sheets. Since July 1, 2001, intangible franchise rights acquired in business combinations have been recorded as distinctly separate intangible assets. In accordance with guidance primarily codified within Accounting Standards Codification (“ASC”) 350, Intangibles-Goodwill and Other, the Company evaluates these franchise rights for impairment annually in the fourth quarter, based on the carrying values of each of the Company’s individual franchise rights as of October 31^st, or more frequently if events or circumstances indicate possible impairment has occurred. In performing its impairment assessments, the Company tests the carrying value of each individual franchise right that was recorded by using a direct value method discounted cash flow model, or income approach, specifically the excess earnings method. Included in this analysis are assumptions, at a dealership level, regarding the cash flows directly attributable to the franchise rights, revenue growth rates, future gross margins and future SG&A expenses. Using an estimated WACC, estimated residual values at the end of the forecast period and estimated future capital expenditure requirements, the Company calculates the fair value of each dealership’s franchise rights. See Note 16, "Asset Impairments” and Note 17, “Intangible Franchise Rights and Goodwill”, for additional details regarding the Company’s intangible franchise rights.
Income Taxes	Income Taxes Currently, the Company operates in 15 different states in the U.S., in the U.K. and in Brazil, each of which has unique tax rates and payment calculations. As the amount of income generated in each jurisdiction varies from period to period, the Company’s estimated effective tax rate can vary based on the proportion of taxable income generated in each jurisdiction. The Company follows the liability method of accounting for income taxes in accordance with ASC 740, Income Taxes. Under this method, deferred income taxes are recorded based on differences between the financial reporting and tax basis of assets and liabilities and are measured using the enacted tax rates and laws that will be in effect when the underlying assets are realized or liabilities are settled. A valuation allowance reduces deferred tax assets when it is more likely than not that some or all of the deferred tax assets will not be realized. The Company has recognized deferred tax assets, net of valuation allowances, that it believes will be realized, based primarily on the assumption of future taxable income. As it relates to U.S. state net operating losses, as well as deferred tax assets primarily relating to net operating losses and goodwill for certain Brazil subsidiaries, a corresponding valuation allowance has been established to the extent that the Company has determined that net income attributable to certain jurisdictions may not be sufficient to realize the benefit.
Fair Value of Financial Assets and Liabilities	Fair Value of Financial Assets and Liabilities The Company’s financial instruments consist primarily of cash and cash equivalents, contracts-in-transit and vehicle receivables, accounts and notes receivable, accounts payable, credit facilities, long-term debt and interest rate derivative instruments. The fair values of cash and cash equivalents, contracts-in-transit and vehicle receivables, accounts and notes receivable, accounts payable, credit facilities and variable-rate long-term debt approximate their carrying values due to the short-term nature of these instruments and/or the existence of variable interest rates. However, the carrying value of the Company’s fixed-rate long-term debt differs from fair value.
Fair Value of Assets Acquired and Liabilities Assumed in Business Combinations	Fair Value of Assets Acquired and Liabilities Assumed in Business Combinations The fair values of assets acquired and liabilities assumed in business combinations are estimated using various assumptions. The most significant assumptions, and those requiring the most judgment, involve the estimated fair values of property and equipment and intangible franchise rights. The Company utilizes third-party experts to determine the fair values of property and equipment purchased, including real estate, and utilizes its fair value model as discussed under “Intangible Franchise Rights” above, supplemented with assistance from third-party experts, to determine the fair value of intangible franchise rights acquired.
Derivative Financial Instruments	Derivative Financial Instruments One of the Company’s primary market risk exposures is increasing interest rates. Interest rate derivatives, designated as cash flow hedges, are used to adjust interest rate exposures, when determined appropriate based on current and forecasted future market conditions. The Company follows the requirements of guidance primarily codified within ASC 815, Derivatives and Hedging (“ASC 815”) pertaining to the accounting for derivatives and hedging activities. ASC 815 requires the Company to recognize all cash flow hedges on its balance sheet at fair value. The related gains or losses on these interest rate derivatives are deferred in stockholders’ equity as a component of accumulated other comprehensive loss. These deferred gains and losses are recognized in income in the period in which the related items being hedged are recognized in expense. Monthly contractual settlements of these swap positions are recognized as floorplan or other interest expense in the Company’s accompanying Consolidated Statements of Operations. However, to the extent that the change in value of a derivative contract does not perfectly offset the change in the value of the items being hedged, that ineffective portion is immediately recognized in other income or expense. All of the Company’s interest rate hedges were designated as cash flow hedges and were deemed to be effective at December 31, 2018, 2017 and 2016. The Company measures the fair value of its interest rate derivative instruments utilizing an income approach valuation technique, converting estimated future amounts of cash flows to a single present value in order to obtain a transfer exit price within the bid and ask spread that is most representative of the fair value of its derivative instruments. In measuring fair value, the Company utilizes the option-pricing Black-Scholes present value technique for all of its derivative instruments. This option-pricing technique utilizes a one-month London Interbank Offered Rate (“LIBOR”) forward yield curve, obtained from an independent external service provider, matched to the identical maturity term of the instrument being measured. Observable inputs utilized in the income approach valuation technique incorporate identical contractual notional amounts, fixed coupon rates, periodic terms for interest payments and contract maturity. The fair value estimate of the interest rate derivative instruments also considers the credit risk of the Company for instruments in a liability position or the counterparty for instruments in an asset position. The credit risk is calculated by using the spread between the one-month LIBOR yield curve and the relevant average 10 and 20-year rate according to Standard and Poor’s. The Company has determined the valuation measurement inputs of these derivative instruments to maximize the use of observable inputs that market participants would use in pricing similar or identical instruments and market data obtained from independent sources, which is readily observable or can be corroborated by observable market data for substantially the full term of the derivative instrument. Further, the valuation measurement inputs minimize the use of unobservable inputs. Accordingly, the Company has classified the derivatives within Level 2 of the ASC 820, Fair Value Measurement and Disclosures (“ASC 820”), hierarchy framework in Note 14, “Fair Value Measurements ”. The Company validates the outputs of its valuation technique by comparison to valuations from the respective counterparties.
Foreign Currency Translation	Foreign Currency Translation The functional currency for the Company’s U.K. subsidiaries is the British pound sterling (£) and of the Company’s Brazil subsidiaries is the Brazilian real (R$). The financial statements of all the Company’s foreign subsidiaries have been translated into U.S. dollars. All assets and liabilities of foreign subsidiaries are translated into U.S. dollars using period-end exchange rates and all revenues and expenses are translated at average rates during the respective period. The difference in the U.S. dollar results that arise from the translation of all assets and liabilities are included in the cumulative currency translation adjustments in accumulated other comprehensive income/loss in stockholders’ equity and in other income/expense, when applicable. Upon disposition of the Company’s investment in a foreign subsidiary, the Company removes the accumulated translation adjustment attributable to that subsidiary from equity and recognizes it through earnings as a part of the gain or loss on the disposition transaction.
Factory Incentives	Factory Incentives In addition to the interest assistance discussed above, the Company receives various dealer incentive payments from certain of the automobile manufacturers. These incentive payments are typically received on parts purchases from the automobile manufacturers and on new vehicle retail sales. These incentives are reflected as reductions of cost of sales in the Consolidated Statements of Operations, as the related inventory is sold. Factory incentive amounts related to parts and vehicles still in inventory as of the balance sheet date are reflected as a reduction of the carrying value of the inventory.
Earnings Per Share	Earnings Per Share The Company utilizes the two-class method for the computation of earnings per share (“EPS”). The two-class method requires a portion of net income to be allocated to participating securities, which are unvested awards of share-based payments with non-forfeitable rights to receive dividends or dividend equivalents. The Company’s restricted stock awards qualify as participating securities as each contain non-forfeitable rights to dividends. Income allocated to these participating securities is excluded from net earnings available to common shares. Basic EPS is computed by dividing net income available to basic common shares by the weighted average number of basic common shares outstanding during the period. Diluted EPS is computed by dividing net income available to diluted common shares by the weighted average number of dilutive common shares outstanding during the period.
Advertising	Advertising The Company expenses the costs of advertising as incurred. Advertising expense for the years ended December 31, 2018, 2017, and 2016, totaled $75.2 million, $74.1 million and $75.3 million, respectively. The Company receives advertising assistance from some of the automobile manufacturers that the Company must spend on qualified advertising and is subject to audit and chargeback by the manufacturer. The assistance is accounted for as a reduction of advertising expense, which is included in SG&A expenses in the accompanying Consolidated Statements of Operations, as the assistance is earned. Advertising assistance amounts received related to vehicles still in inventory as of the balance sheet date are reflected in accrued expenses.
Business and Credit Risk Concentrations	Business and Credit Risk Concentrations The Company owns and operates franchised automotive dealerships in the U.S., the U.K. and Brazil. Automotive dealerships operate pursuant to franchise agreements with vehicle manufacturers. Franchise agreements generally provide the manufacturers or distributors with considerable influence over the operations of the dealership. The success of any franchised automotive dealership is dependent, to a large extent, on the financial condition, management, marketing, production and distribution capabilities of the vehicle manufacturers or distributors of which the Company holds franchises. The Company purchases substantially all of its new vehicles from various manufacturers or distributors at the prevailing prices to all franchised dealers. The Company’s sales volume could be adversely impacted by the manufacturers’ or distributors’ inability to supply the dealerships with an adequate supply of vehicles.
Statements of Cash Flows	Statements of Cash Flows With respect to all new vehicle floorplan borrowings, the manufacturers of the vehicles draft the Company’s credit facilities directly with no cash flow to or from the Company. With respect to borrowings for used vehicle financing in the U.S., the Company finances up to 85% of the value of the used vehicle inventory and the funds flow directly to the Company from the lender. In the U.K. and Brazil, the Company chooses which used vehicles to finance and the borrowings flow directly to the Company from the lender. All borrowings from, and repayments to, lenders affiliated with the vehicle manufacturers (excluding the cash flows from or to manufacturer affiliated lenders participating in the Company’s syndicated lending group under the Revolving Credit Facility) are presented within Cash Flows from Operating Activities on the Consolidated Statements of Cash Flows. All borrowings from, and repayments to, the syndicated lending group under the Revolving Credit Facility (as defined in Note 12, “Credit Facilities”) (including the cash flows from or to manufacturer affiliated lenders participating in the facility), as well as borrowing from, and repayments to, the Company’s other credit facilities are presented within Cash Flows from Financing Activities.
Stock-Based Compensation	Stock-Based Compensation Stock-based compensation represents the expense related to stock-based awards granted to employees and non-employee directors. The Company measures stock-based compensation expense at grant date based on the estimated fair value of the award and recognizes the cost on a straight-line basis, net of estimated forfeitures, over the employee requisite service period. The Company estimates the fair value of its employee stock purchase rights issued pursuant to the Employee Stock Purchase Plan using a Black-Scholes valuation model. The expense for stock-based awards is recognized as a Selling, general and administrative expense in the accompanying Consolidated Statements of Operations.
Self-Insured Medical, Property and Casualty Reserves	Self-Insured Medical, Property and Casualty Reserves The Company purchases insurance policies for worker’s compensation, liability, auto physical damage, property, pollution, employee medical benefits and other risks consisting of large deductibles and/or self-insured retentions. The Company’s U.S. auto physical damage insurance coverage is composed of a $10.0 million per occurrence company deductible with an annual maximum aggregate deductible of $30.0 million with no maximum payout. Under the Company’s U.S. workers’ compensation and general liability insurance coverage, its exposure per claim is limited to $1.0 million per occurrence, with unlimited exposure on the number of claims up to $1.0 million that may be incurred. As of December 31, 2018, the Company had accrued $19.3 million for its estimated liability on incurred worker’s compensation and general liability claims. At least annually, the Company engages a third-party actuary to conduct a study of the exposures under the self-insured portion of its worker’s compensation and general liability insurance programs for all open policy years. In the interim, the Company reviews the estimates within the study and monitors actual experience for unusual variances. The appropriate adjustments are made to the accrual, based upon these procedures. Actuarial estimates for the portion of claims not covered by insurance are based on historical claims experience adjusted for loss trending and loss development factors. Changes in the frequency or severity of claims from historical levels could influence our reserve for claims and our financial position, results of operations and cash flows. The Company’s U.S. insurance coverage for employee medical benefits limits the Company’s exposure to $1.0 million per occurrence. The Company’s U.S. property insurance includes coverage for building damage, content damage and business interruption. Deductibles for the U.S. property insurance vary depending on the cause of damage and the location. The Company has insurance policies covering similar risks with smaller deductibles and/or self-insured retentions in both the U.K. and Brazil.
Recently Adopted and Recently Issued Accounting Pronouncements	Recently Adopted Accounting Pronouncements In August 2016, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2016-15, Statement of Cash Flows (Topic 230): Classification of Certain Cash Receipts and Cash Payments. The amendments in this update address several specific cash flow issues with the objective of reducing the diversity in practice in how certain cash receipts and cash payments are presented and classified in the statement of cash flows. The Company adopted ASU 2016-15 during the first quarter of 2018. The adoption of this ASU did not materially impact its net income, retained earnings, consolidated financial statements, results of operations or cash flows. In November 2016, the FASB issued ASU 2016-18, Statement of Cash Flows (Topic 230): Restricted Cash, a consensus of the FASB Emerging Issues Task Force (“EITF”). The amendments in this update require that a statement of cash flows explain the change during the period in the total of cash, cash equivalents, and amounts generally described as restricted cash or restricted cash equivalents. Therefore, amounts generally described as restricted cash and restricted cash equivalents should be included with cash and cash equivalents when reconciling the beginning-of-period and end-of-period total amounts shown on the statement of cash flows. The Company adopted ASU 2016-18 during the first quarter of 2018. The adoption of this ASU did not materially impact its consolidated financial statements, results of operations or cash flows. In January 2017, the FASB issued ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business. The amendments in this update clarify the definition of a business in order to assist entities with evaluating whether transactions should be accounted for as acquisitions (or disposals) of assets or businesses. The amendments in this ASU should be applied prospectively. The Company adopted ASU 2017-01 during the first quarter of 2018. The adoption of this ASU did not materially impact its consolidated financial statements or results of operations. In May 2017, the FASB issued ASU 2017-09, Compensation - Stock Compensation (Topic 718): Scope of Modification Accounting. The amendments in this update provide clarity and reduce both diversity in practice and cost and complexity when applying the guidance of Topic 718 to a change to the terms or conditions of a share-based payment award. Under the new guidance, an entity will not apply modification accounting to a share-based payment award if all of the following are the same immediately before and after the change: 1) the award's fair value (or calculated value or intrinsic value, if those measurement methods are used), 2) the award's vesting conditions, and 3) the award's classification as an equity or liability instrument. The Company adopted ASU 2017-09 during the first quarter of 2018. The adoption of this ASU did not impact its consolidated financial statements or results of operations. In February 2018, the FASB issued ASU 2018-02, Income Statement - Reporting Comprehensive Income (Topic 220): Reclassification of Certain Tax Effects from Accumulated Other Comprehensive Income. The amendments in this update will permit entities to reclassify tax effects stranded in accumulated other comprehensive income as a result of tax legislation enacted by the U.S. government on December 22, 2017, commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), to retained earnings. The FASB gave entities the option to reclassify these amounts rather than require reclassification and the option to apply the guidance retrospectively or in the period of adoption. The amendments in this update are effective for interim and annual periods beginning after December 15, 2018 with early adoption permitted. The Company early adopted ASU 2018-02 as of July 1, 2018, and reclassified $0.2 million of stranded tax effects from accumulated other comprehensive income to retained earnings. Recently Issued Accounting Pronouncements In February 2016, the FASB issued ASU 2016-02, Leases (Topic 842), that amends the accounting guidance on leases. The standard establishes a right-of-use (ROU) model that requires a lessee to record an ROU asset and a lease liability on the balance sheet for all leases with terms longer than 12 months. Originally, entities were required to adopt this ASU using a modified retrospective transition method. The FASB subsequently issued amendments to the standard, including providing an additional transition method that allows entities the option of recognizing the cumulative effect of applying the new standard as an adjustment to beginning retained earnings in the year of adoption while continuing to present all prior periods under previous lease accounting guidance. This standard update along with the amendments, will be effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company will adopt this accounting standard update on January 1, 2019, as required, using the optional transition method with no restatement of comparative period and a cumulative effect adjustment, if any, recognized on the date of adoption. While the Company has not completed its assessment of the impacts of the ASU 2016-02, the Company expects that the adoption of this standard will have a significant impact on its consolidated balance sheet for real estate and equipment operating leases. Upon adoption, the Company expects to recognize additional operating liabilities ranging from $200 million to $300 million, with corresponding ROU assets of approximately the same amount based on the present value of the remaining minimum rental payments under current leasing standards for existing operating leases. As part of the Company’s implementation process, the Company has assessed its lease agreements, evaluated accounting policy elections, and implemented software to meet the reporting requirements of the standard. The Company is also currently evaluating the changes in controls and processes that are necessary to implement the standard update, but does not expect material changes. In June 2016, the FASB issued ASU 2016-13, Financial Instruments - Credit Losses (Topic 326): Measurement of Credit Losses on Financial Instruments. The amendment replaces the current incurred loss impairment methodology of recognizing credit losses when a loss is probable, with a methodology that reflects expected credit losses and requires consideration of a broader range of reasonable and supportable information to assess credit loss estimates. The standard will be effective for fiscal years beginning after December 15, 2019, with early adoption permitted for periods after December 15, 2018. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements or results of operations, but does not expect the amendments in this ASU to materially impact its consolidated financial statements. In January 2017, the FASB issued ASU 2017-04, Intangibles - Goodwill and Other (Topic 350): Simplifying the Test for Goodwill Impairment. The amendment eliminates the requirement to calculate the implied fair value of goodwill to measure a goodwill impairment charge. Instead, entities will record an impairment charge based on the excess of a reporting unit's carrying amount over its fair value. The amendments in this update should be applied prospectively and are effective for interim and annual periods beginning after December 15, 2019. Earlier application is permitted for interim or annual goodwill impairment tests performed on testing dates after January 1, 2017. The impact of the adoption of the provisions of the ASU on the Company’s consolidated financial statements will depend upon the significance of future impairments realized. In August 2017, the FASB issued ASU 2017-12, Derivatives and Hedging (Topic 715): Targeted Improvements to Accounting for Hedging Activities. The amendments in this update better align an entity's risk management activities and financial reporting for hedging relationships through changes to both the designation and measurement guidance for qualifying hedging relationships and the presentation of hedge results. The guidance eliminates the requirement to separately measure and report hedge ineffectiveness and generally requires the entire change in the fair value of a hedging instrument to be presented in the same income statement line as the hedged item. The guidance also eases the administrative burden of hedge documentation requirements and assessing hedge effectiveness. The amendments to cash flow and net investment hedge relationships should be applied using a modified retrospective approach while the presentation and disclosure requirements are applied prospectively, effective for fiscal years beginning after December 15, 2018, with early adoption permitted. The Company is currently evaluating the impact that the adoption of the provisions of the ASU will have on its consolidated financial statements. In August 2018, the FASB issued ASU 2018-13, Fair Value Measurement (Topic 820): Disclosure Framework - Changes to the Disclosure Requirements for Fair Value Measurement. The amendment modifies the disclosure requirements on fair value measurements by removing, modifying, or adding certain disclosures. The amendment will be effective for interim and annual periods beginning after December 15, 2019, with early adoption permitted. Certain disclosures in this standard are required to be applied on a retrospective basis and others on a prospective basis. The Company is currently evaluating the potential impact of adopting this guidance on its consolidated financial statements.
Revenue Recognition	Adoption of ASC Topic 606, "Revenue from Contracts with Customers" Effective January 1, 2018, the Company adopted ASU 2014-09, Revenue from Contracts with Customers (Topic 606) (“Topic 606”), and all subsequent amendments issued thereafter, that amend the accounting guidance on revenue recognition. The Company adopted Topic 606 using the modified retrospective method applied to those contracts that were not completed as of January 1, 2018, with a cumulative-effect adjustment to retained earnings recognized as of the date of adoption. Results for reporting periods beginning after January 1, 2018 are presented under Topic 606, while prior period amounts are not adjusted and continue to be reported in accordance with the Company’s historic accounting policies under Topic 605, Revenue Recognition. The Company identified its material revenue streams to be the sale of new and used vehicles; arrangement of associated vehicle financing and the sale of service and other insurance contracts; the performance of vehicle maintenance and repair services; and the sale of vehicle parts. The Company concluded that no changes to the timing of revenue recognition for the sale of new and used vehicles, as well as vehicle parts are necessary. As it relates to the performance of vehicle maintenance and repair services recognized as a part of Parts and service sales in the accompanying Consolidated Statements of Operations, the Company identified a change in its accounting policies and procedures. Through December 31, 2017, the Company recognized revenue once the maintenance or repair services were completed and the vehicle was delivered to the customer. Under Topic 606, the Company determined that it has an enforceable right to payment during the course of the work being performed in certain jurisdictions and, thus, the Company changed its policy under Topic 606 for those jurisdictions to recognize revenue over time as the maintenance and repair services are performed. With regards to the revenue generated from the arrangement of vehicle financing and the sale of service and other insurance contracts recognized as a part of Finance, insurance and other, net in the accompanying Consolidated Statements of Operations, the Company also identified a change in the Company’s accounting policies and procedures. Generally, the Company receives an upfront commission for these transactions from the finance or insurance provider and recognizes the associated revenue when the contract is executed. In some cases, the Company also earns retrospective commission income by participating in the future profitability of the portfolio of contracts sold by the Company. Through December 31, 2017, the Company’s accounting policy was to recognize upfront commission income earned when the contract was executed and the amount was determinable, and to recognize retrospective commission income as the amounts were determined and realized. The Company concluded that this retrospective commission income represents variable consideration for which the Company’s performance obligation is satisfied when the finance or insurance product contract is executed with the end user. Under the new standard, an estimate of variable consideration, subject to a constraint, is to be included in the transaction price and recognized when or as the performance obligation is satisfied. Therefore, the Company’s accounting policy changed under Topic 606 such that the Company will estimate the amount of future earnings that it will realize from the ultimate profitability of the portfolio of contracts subject to a retrospective commission and recognize such estimate, subject to any constraint in the estimate, upfront when the contract is executed with the end user. The Company's estimates of the amount of variable consideration to be ultimately realized will be reassessed at the end of each reporting period and changes in those estimates will be adjusted through revenue. As discussed in Note 2, “Summary of Significant Accounting Policies and Estimates”, the Company’s material revenue streams are the sale of new and used vehicles; arrangement of associated vehicle financing and the sale of service and other insurance contracts; the performance of vehicle maintenance and repair services (including collision restoration); and the sale of vehicle parts. New and Used Vehicle Sales Specific to the sale of new and used vehicles, the Company has a single performance obligation associated with these contracts - the delivery of the vehicle to the customer, which is the point at which transfer of control occurs. Revenue from the sale of new and used vehicles is recognized upon satisfaction of the performance obligation (i.e., delivery of the vehicle to the customer). In some cases, the Company uses a third-party auction as an agent to facilitate delivery of used vehicles to the customer. Incidental items that are immaterial in the context of the contract are accrued at the time of sale. The transaction price for new and used vehicle sales (i.e., the amount that the Company has the right to under the terms of the sales contract with the customer) is the stand-alone sales price of each individual vehicle and is generally settled within 30 days of the satisfaction of the performance obligation. In many new and used vehicle sales transactions, a portion of the consideration applied by the customer to the satisfaction of the total transaction price is a used vehicle trade-in (i.e., noncash consideration). The Company measures such noncash consideration at fair value. Revenue recognized from the sale of new and used vehicles is reflected in New vehicle retail sales, Used vehicle retail sales, and Used vehicle wholesale sales in the accompanying Consolidated Statements of Operations. With respect to the cost of freight and shipping from its dealerships to its customers, the Company’s policy is to recognize such cost in the corresponding cost of sales category. With respect to taxes assessed by governmental authorities that are imposed upon new and used vehicle sales transactions and collected by the Company from its customers, the Company’s policy is to exclude such amounts from revenues. Vehicle Parts Sales Related to the sale of vehicle parts, the Company has a single performance obligation associated with these contracts - the delivery of the parts to the customer, which is the point at which transfer of control occurs. Revenue from the sale of vehicle parts is recognized upon satisfaction of the performance obligation (i.e., delivery of the parts to the customer). The transaction price for vehicle parts sales (i.e., the amount that the Company has the right to under the terms of the sales contract with the customer) is the stand-alone sales price of each individual part and is generally settled within 30 days of the satisfaction of the performance obligation. Revenue recognized from the sale of vehicle parts is reflected in Parts and service sales in the accompanying Consolidated Statements of Operations. With respect to the cost of freight and shipping to its customers, the Company’s policy is to recognize such fulfillment cost in the corresponding cost of sales category. With respect to taxes assessed by governmental authorities that are imposed upon vehicle parts sales transactions and collected by the Company from its customers, the Company’s policy is to exclude such amounts from revenues. Maintenance and Repair Services As it relates to vehicle maintenance and repair services (including collision restoration), the Company has a single performance obligation associated with these contracts - the completion of the services. The Company has an enforceable right to payment in certain jurisdictions and, as such, transfers control of vehicle maintenance and repair services to its customer over time. Therefore, satisfaction of the performance obligation associated with the vehicle maintenance and repair services occurs, and the associated revenue is recognized, over time. The Company uses the input method for the measurement of progress and recognition of revenue, utilizing labor hours and parts applied to the customer vehicle to estimate the services performed for which the Company has an enforceable right to payment. The transaction price for vehicle maintenance and repair services (i.e., the amount that the Company has the right to under the terms of the service contract with the customer) is the sum total of the labor and, if applicable, vehicle parts used in the performance of the service, as well as the margin above cost charged to the customer. The transaction price is typically settled within 30 days of the satisfaction of the performance obligation, which generally occurs within a short period of time from contract inception. Revenue recognized from vehicle maintenance and repair services is reflected in Parts and service sales in the accompanying Consolidated Statements of Operations. With respect to taxes assessed by governmental authorities that are imposed upon vehicle maintenance and repair service transactions and collected by the Company from its customer, the Company’s policy is to exclude such amounts from revenues. Arrangement of Vehicle Financing and the Sale of Service and Other Insurance Contracts The Company receives commissions from finance and insurance providers, under the terms of its contracts with such providers, for the arrangement of vehicle financing and the sale of service and other insurance products. Within the context of the Company's contracts with the finance or insurance provider, the Company has determined that it is an agent for the finance or insurance provider and the finance or insurance provider is the Company's customer. The Company has a single performance obligation associated with these contracts for all commissions earned - the facilitation of the financing of the vehicle or sale of the insurance product. Revenue from these contracts is recognized upon satisfaction of the performance obligation, which is when the finance or insurance product contract is executed with the purchaser. The transaction price (i.e., the amount that the Company has the right to under the terms of the contract with the customer) consists of both fixed and variable consideration. With regards to the upfront commission for these contracts, the transaction price is the amount earned for each individual contract executed and is generally collected within 30 days of the satisfaction of the performance obligation. The Company may be charged back for unearned financing, insurance contract or vehicle service contract fees in the event of early termination of the contracts by customers. A reserve for future amounts estimated to be charged back is recorded, as a reduction of Finance, insurance and other revenue, net in the accompanying Consolidated Statement of Operations, based on the Company’s historical chargeback results and the termination provisions of the applicable contracts. In some cases, the Company also earns retrospective commission income by participating in the future profitability of the portfolio of product contracts sold by the Company. This consideration is variable (i.e., contingent upon the performance of the portfolio of contracts) and is generally settled over five to seven years from the satisfaction of the performance obligation. The Company utilizes the “expected value” method to predict the amount of consideration to which the Company will be entitled, subject to constraint in the estimate. Therefore, the Company estimates the amount of future earnings that it will realize from the ultimate profitability of the portfolio and recognizes such estimate, subject to any constraint in the estimate, upfront when the product contract is executed with the end user, which is when the performance obligation is satisfied. Changes in the Company’s estimates of the amount of variable consideration to be ultimately realized are adjusted through revenue. Revenue recognized from the arrangement of vehicle financing and the sale of service and other insurance contracts is reflected in Finance, insurance and other, net, within the Consolidated Statements of Operations and as a contract asset reflected in Prepaid expenses and other current assets within the Consolidated Balance Sheets until the right to such consideration becomes unconditional, at which time amounts due are reclassified to accounts receivable.