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Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2017 | Sep. 30, 2016 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |  |  |
Income Tax Disclosure [Text Block] |  |  | INCOME TAXES The Company is subject to U.S. federal income taxes and income taxes in numerous U.S. states. In addition, the Company is subject to income tax in the U.K. and Brazil relative to its foreign subsidiaries. The Company's effective income tax rate of 36.6% for the three months ended September 30, 2017 was more than the U.S. federal statutory rate of 35.0%, due primarily to the taxes provided for in U.S. state jurisdictions, valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil and unrecognized tax benefits with respect to uncertain tax positions, partially offset by income generated in the U.K., which is taxed at a lower statutory rate. The Company's effective income tax rate of 35.7% of pretax income for the nine months ended September 30, 2017, was more than the U.S. federal statutory rate of 35.0%, as taxes provided for in the U.S. state jurisdictions and valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil and unrecognized tax benefits with respect to uncertain tax positions, were substantially offset by (a) income generated in the U.K., which is taxed at a lower statutory rate, (b) the tax impact of dealership dispositions in Brazil, and (c) excess tax deductions for restricted stock resulting from the adoption of ASU 2016-09 during the nine months ended September 30, 2017. For the three and nine months ended September 30, 2017, the Company's effective tax rate increased to 36.6% and 35.7%, respectively, as compared to 36.5% and 35.0% for the three and nine months ended September 30, 2016, respectively. This increase was primarily due to the mix effect resulting from taxes provided for in foreign jurisdictions, changes to valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil and unrecognized tax benefits with respect to uncertain tax positions during the three and nine months ended September 30, 2017, partially offset by excess tax deductions for restricted stock resulting from the adoption of ASU 2016-09 during the nine months ended September 30, 2017, as well as the tax impact of dealership dispositions in Brazil during the nine months ended September 30, 2016. As of September 30, 2017, the Company recorded $1.2 million unrecognized tax benefits, including $0.2 million of related interest and penalty. As of December 31, 2016, the Company had no unrecognized tax benefits with respect to uncertain tax positions and did not incur any interest and penalties. Consistent with prior treatment of tax related assessments, the Company recognizes interest and penalties related to uncertain tax positions in income tax expense. The Company's taxable years 2013 and subsequent remain open for examination in the U.S. The Company's taxable years 2015 and subsequent remain open in the U.K. and taxable years 2012 and subsequent remain open in Brazil. |  |
Effective tax rate | 36.60% | 36.50% | 35.70% | 35.00% |
U.S. federal statutory corporate tax rate |  |  | 35.00% |  |
Unrecognized Tax Benefits | $ 1,200,000.0 |  | $ 1,200,000.0 |  | $ 0
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense |  |  | $ 200,000 |  |
UNITED STATES |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Open Tax Year | 2013 |  |  |  |
UNITED KINGDOM |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Open Tax Year | 2015 |  |  |  |
BRAZIL |  |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |  |
Open Tax Year | 2012 |  |  |  |

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32559-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32718-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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