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Subsequent Events	12 Months Ended
	Dec. 31, 2016
Subsequent Events [Abstract]
Subsequent Events [Text Block]	16. SUBSEQUENT EVENTS Subsequent to December 31, 2016, we announced the completion of the following additional business acquisitions: • Maloney Field Services - an Australian-based valuation and property firm, • Meridian Immobilier SA - a Switzerland-based real estate consulting firm, • Urbis Partners, LLC - a Seattle-based commercial real estate firm, and • Zabel Property AG - a German-based residential real estate brokerage and advisory firm. Total consideration payable for these acquisitions could be up to $25.0 million.

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The entire disclosure for significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, catastrophic loss, significant foreign exchange rate changes, loans to insiders or affiliates, and transactions not in the ordinary course of business.

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