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Income Taxes (Details Textual) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 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 June 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 and valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil, 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 35.3% of pretax income for the six months ended June 30, 2017, was approximately equal to 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 were primarily 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 six months ended June 30, 2017.
For the three and six months ended June 30, 2017, the Company's effective tax rate increased to 36.6% and 35.3%, respectively, as compared to 32.6% and 34.3% for the three and six months ended June 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, partially offset by excess tax deductions for restricted stock resulting from the adoption of ASU 2016-09 during the six months ended June 30, 2017, as well as the tax impact of dealership dispositions in Brazil during the three months ended June 30, 2016 .
As of June 30, 2017 and December 31, 2016, the Company had no unrecognized tax benefits with respect to uncertain tax positions and did not incur any interest and penalties nor did it accrue any interest for the six months ended June 30, 2017. When applicable, consistent with prior practice, the Company recognizes interest and penalties related to uncertain tax positions in income tax expense.
The Company's taxable years 2012 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 2011 and subsequent remain open in Brazil.
    
Effective tax rate 36.60% 32.60% 35.30% 34.30%  
U.S. federal statutory corporate tax rate     35.00%    
Unrecognized Tax Benefits $ 0   $ 0   $ 0
UNITED STATES          
Segment Reporting Information [Line Items]          
Open Tax Year 2012        
UNITED KINGDOM          
Segment Reporting Information [Line Items]          
Open Tax Year 2015        
BRAZIL          
Segment Reporting Information [Line Items]          
Open Tax Year 2011