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Securities Loaned	12 Months Ended
Securities Loaned	Dec. 31, 2019
Investments, Debt and Equity Securities [Abstract]
Securities Loaned	Securities Loaned As of December 31, 2019, Newmark had Securities loaned transactions with Cantor of $36.7 million. As of December 31, 2018, Newmark did not have any securities loaned transactions. The market value of the securities loaned as of December 31, 2019 was $36.8 million. As of December 31, 2019 the cash collateral received from Cantor bore an interest rate of 2.45%.