Income Taxes (Details) - USD ($)	3 Months Ended		6 Months Ended
Income Taxes (Details) - USD ($)	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Segment Reporting Information [Line Items]
Income Tax Disclosure [Text Block]			INCOME TAXES For the three and six months ended June 30, 2018, the Company's effective tax rate decreased to 24.9% and 24.0%, respectively, as compared to 36.6% and 35.3% for the three and six months ended June 30, 2017, respectively. This decrease was primarily due to the impact of the Tax Act that made broad and complex changes to the Code. Those changes include, but are 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. 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 June 30, 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 24.9% and 24.0% for the three and six months ended June 30, 2018, respectively, 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; (3) unrecognized tax benefits with respect to uncertain tax positions; and (4) the deferred tax impact of certain goodwill amortization in Brazil, 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. 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 June 30, 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. As of June 30, 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 reduce the tax liability in that period by approximately $1.1 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	24.90%	36.60%	24.00%	35.30%
U.S. federal corporate tax rate			21.00%
Unrecognized tax benefits	$ 1,300,000.0		$ 1,300,000.0
Impact of unrecognized tax benefits on tax liability			$ 1,100,000
United States
Segment Reporting Information [Line Items]
Open tax year	2013
United Kingdom
Segment Reporting Information [Line Items]
U.S. federal corporate tax rate			19.00%
Open tax year	2016
Brazil
Segment Reporting Information [Line Items]
Open tax year	2012