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Income Taxes (Details Textual) - USD ($)	3 Months Ended
	Mar. 31, 2017	Mar. 31, 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 33.7% for the three months ended March 31, 2017 was less than the U.S. federal statutory rate of 35.0%, due primarily to a portion of the Company's pretax income being generated in the U.K. region, which is taxed at a lower statutory rate, and excess tax deductions for vested restricted stock resulting from the adoption of ASU 2016-09 during the three months ended March 31, 2017. This was partially offset by 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. For the three months ended March 31, 2017, the Company's effective tax rate decreased to 33.7% as compared to 36.6% for the same period in 2016. This decrease was primarily due to the mix effect resulting from proportionately more pretax income generated in the Company's U.K. region, as well as changes to valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil, the tax impact of dealership dispositions in Brazil and excess tax deductions for vested restricted stock resulting from the adoption of ASU 2016-09 during the three months ended March 31, 2017. As of March 31, 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 three months ended March 31, 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 2015 and subsequent remain open in the U.K., and taxable years 2011 and subsequent remain open in Brazil.
Effective tax rate	33.70%	36.60%
U.S. federal statutory corporate tax rate	35.00%
Unrecognized Tax Benefits	$ 0		$ 0
UNITED KINGDOM
Segment Reporting Information [Line Items]
Open Tax Year	2015
BRAZIL
Segment Reporting Information [Line Items]
Open Tax Year	2011

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Tax year that remains open to examination under enacted tax laws, in CCYY format.

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