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Income Taxes (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
Income Taxes (Details Textual) - USD ($)	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Dec. 31, 2014
Income Tax Contingency [Line Items]
Unrecognized Tax Benefits	$ 0		$ 0		$ 0
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 rates of 38.0% and 37.6% of pretax income for the three and nine months ended September 30, 2015, respectively, differed from the U.S. federal statutory rate of 35.0% due primarily to taxes provided for in U.S. state and foreign jurisdictions in which the Company operates, as well as valuation allowances provided for net operating losses in certain U.S. states and in Brazil. For the three and nine months ended September 30, 2015, the Company's effective tax rate decreased compared to the same periods in 2014 to 38.0% and 37.6% from 40.4% and 43.4%, respectively. These decreases were primarily due to the tax deductible loss recognized in 2014 on the purchase of the majority of the 2.25% Notes and the 3.00% Notes that was less than the loss recognized for U.S. GAAP. As of September 30, 2015 and December 31, 2014, 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 nine months ended September 30, 2015. When applicable, consistent with prior practice, the Company recognizes interest and penalties related to uncertain tax positions in income tax expense. Taxable years 2010 and subsequent remain open for examination by the Company’s major taxing jurisdictions.
Effective tax rate	38.00%	40.40%	37.60%	43.38%
U.S. federal statutory corporate tax rate	35.00%
2.25% Convertible Notes [Member]
Income Tax Contingency [Line Items]
Debt Instrument, Interest Rate, Stated Percentage	2.25%		2.25%