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Income Taxes (Details Textual) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Mar. 31, 2017 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Income Tax Disclosure [Text Block] | INCOME TAXES The Tax Act made broad and complex changes to the U.S. tax code, including, but not limited to, reducing the U.S. federal corporate tax rate from 35.0% to 21.0%, creating a territorial tax system that generally eliminates U.S. federal income taxes on dividends from foreign subsidiaries, requiring companies to pay a one-time transition tax on unrepatriated earnings of their foreign subsidiaries, creating a "minimum tax" on certain foreign earnings (i.e. global intangible low-taxed income, or "GILTI"), limiting the deduction for net interest expense incurred by U.S. corporations, and eliminating certain deductions, including deductions for certain compensation arrangements and certain other business expenses. In accordance with SEC Staff Accounting Bulletin No. 118, Income Tax Accounting Implications of the Tax Cuts and Job Act (“SAB 118”), the Company made a reasonable estimate of the Tax Act’s impact and provisionally recorded this estimate in its results for the period ended December 31, 2017. As of March 31, 2018, the Company has not completed its accounting for the aspects of the Tax Act recorded provisionally: the re-measurement of deferred taxes based on the reduced tax rate, and the Company's provisional determination that the Company does not have a transition tax liability for previously untaxed accumulated and current earnings and profits of foreign subsidiaries. The Company will continue to gather data and evaluate the impact of the Tax Act after the Company has considered additional guidance issued by the U.S. Treasury Department, the IRS, state tax authorities and other standard-setting bodies. This analysis may result in adjustments to the provisional amounts, which would impact the Company's provision for income taxes and effective tax rate for the period in which the adjustments are made. The Company expects to complete its accounting for the Tax Act in 2018. The Company recognizes the tax on GILTI as a period expense in the period the tax is incurred. Under this policy, the Company has not provided deferred taxes related to temporary differences that upon their reversal will affect the amount of income subject to GILTI in the period. As of March 31, 2018, the Company estimated that the 2018 GILTI tax will not be material. 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 22.4% for the three months ended March 31, 2018 was more than the U.S. federal statutory rate of 21.0%, due primarily to: (1) the taxes provided for in U.S. state jurisdictions; (2) valuation allowances provided for net operating losses and other deferred tax assets in certain U.S. states and in Brazil; and (3) unrecognized tax benefits with respect to uncertain tax positions, partially offset by: (1) income generated in the U.K., which is taxed at a 19.0% statutory rate; and (2) excess tax deductions for restricted stock awards. Compared to the effective tax rate for three months ended March 31, 2017 of 33.7%, the Company's effective tax rate decreased primarily due to the impact of the reduction of the federal corporate tax rate as a result of the Tax Act. As of March 31, 2018, the Company's unrecognized tax benefits totaled $1.3 million, including related interest and penalty. To the extent that any such tax benefits are recognized in the future, such recognition would impact the tax liability in that period by approximately $1.0 million. 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 2016 and subsequent remain open in the U.K., and taxable years 2012 and subsequent remain open in Brazil. |  |
Effective tax rate | 22.40% | 33.70% |
U.S. federal statutory corporate tax rate | 21.00% |  | 35.00%
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Percent |  |  | 21.00%
Unrecognized Tax Benefits | $ 1,300,000.0 |  | $ 0
Unrecognized Tax Benefits, Increase Resulting from Current Period Tax Positions | $ 1,000,000 |  |
UNITED STATES |  |  |
Segment Reporting Information [Line Items] |  |  |
Open Tax Year | 2013 |  |
UNITED KINGDOM |  |  |
Segment Reporting Information [Line Items] |  |  |
U.S. federal statutory corporate tax rate | 19.00% |  |
Open Tax Year | 2016 |  |
BRAZIL |  |  |
Segment Reporting Information [Line Items] |  |  |
Open Tax Year | 2012 |  |

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- Definition Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to changes in the income tax rates. + 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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