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Securities Loaned	6 Months Ended
	Jun. 30, 2019
Investments Debt And Equity Securities [Abstract]
Securities Loaned	(20) Securities Loaned As of June 30, 2019, Newmark had securities loaned transactions with Cantor of $33.7 million. The fair value of the securities loaned was $33.7 million. As of June 30, 2019, the cash collateral received from Cantor bore interest rates ranging from 2.97% to 3.15%. As of December 31, 2018, Newmark did not have any securities loaned transactions with Cantor. Securities loaned transactions are included in “Securities loaned” in Newmark’s unaudited condensed consolidated balance sheets (See Note 7 — Marketable Securities).

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