Condensed Consolidated Statements of Cash Flows (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
RECONCILIATION OF CASH AND CASH EQUIVALENTS AND RESTRICTED CASH WITHIN THE CONDENSED CONSOLIDATED STATEMENTS OF FINANCIAL CONDITION:
Cash and cash equivalents	$ 896,843	$ 1,231,593
Deposits with banks and short-term investments	1,155,539	1,180,686
Cash deposited with clearing organizations and other segregated cash	40,283	43,280
TOTAL CASH AND CASH EQUIVALENTS AND RESTRICTED CASH	$ 2,092,665	$ 2,455,559	$ 2,260,502	$ 2,291,885