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Note 1. Basis of Presentation Business Description (Details)	Dec. 31, 2017 Brokerage_Offices	Dec. 31, 2017 franchisedandcompanyownedoffices	Dec. 31, 2017 metropolitan_areas	Dec. 31, 2017 Countries	Dec. 31, 2017 employees	Dec. 31, 2016 franchisedandcompanyownedoffices	Dec. 31, 2015 franchisedandcompanyownedoffices	Dec. 31, 2014 franchisedandcompanyownedoffices
Number of International Countries in which Entity Operates \| Countries				115
Number of largest metropolitan areas \| metropolitan_areas			50
Franchised and Company Owned
Number of offices \| franchisedandcompanyownedoffices		14,800
Number of Independent Sales Associates \| employees					289,000
Company Owned Real Estate Brokerage Services
Number of offices	790	789				789	787	727
Number of Independent Sales Associates \| employees					50,300
Maximum
Number of largest metropolitan areas \| metropolitan_areas			100