Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018
Cash Flows From Operating Activities
Net Income	$ 175,457	$ 191,396
Adjustments to Reconcile Net Income to Net Cash Provided by (Used in) Operating Activities:
Net (Gains) Losses on Investments, Marketable Securities and Contingent Consideration	(9,985)	1,941
Equity Method Investments	3,402	3,673
Equity-Based and Other Deferred Compensation	192,286	141,225
Depreciation, Amortization and Accretion	28,214	13,523
Bad Debt Expense	1,750	1,622
Deferred Taxes	(12,427)	(1,576)
Decrease (Increase) in Operating Assets:
Marketable Securities	(514)	36
Financial Instruments Owned and Pledged as Collateral at Fair Value	120	508
Securities Purchased Under Agreements to Resell	(210)	(50)
Accounts Receivable	(9,800)	(92,014)
Receivable from Employees and Related Parties	4,133	(4,075)
Other Assets	(87,498)	(4,401)
(Decrease) Increase in Operating Liabilities:
Accrued Compensation and Benefits	(411,865)	(81,922)
Accounts Payable and Accrued Expenses	(176)	6,506
Securities Sold Under Agreements to Repurchase	68	(447)
Payables to Employees and Related Parties	13,757	13,415
Taxes Payable	(29,702)	(11,125)
Other Liabilities	7,911	(3,728)
Net Cash Provided by (Used in) Operating Activities	(135,079)	174,507
Cash Flows From Investing Activities
Investments Purchased	(2,819)	(45)
Distributions of Private Equity Investments	364	1,578
Marketable Securities:
Proceeds from Sales and Maturities	263,490	41,950
Purchases	(266,486)	(176,202)
Maturity of Certificates of Deposit	100,000	63,527
Purchase of Certificates of Deposit	0	(50,000)
Purchase of Furniture, Equipment and Leasehold Improvements	(26,282)	(7,178)
Net Cash Provided by (Used in) Investing Activities	68,267	(126,370)
Cash Flows From Financing Activities
Issuance of Noncontrolling Interests	0	830
Distributions to Noncontrolling Interests	(31,696)	(20,584)
Short-Term Borrowings	30,000	30,000
Repayment of Short-Term Borrowings	(30,000)	(30,000)
Repayment of Subordinated Borrowings	0	(6,799)
Purchase of Treasury Stock and Noncontrolling Interests	(265,043)	(185,373)
Dividends	(50,797)	(37,019)
Net Cash Provided by (Used in) Financing Activities	(347,536)	(248,945)
Effect of Exchange Rate Changes on Cash	(1,133)	(1,576)
Net Increase (Decrease) in Cash, Cash Equivalents and Restricted Cash	(415,481)	(202,384)
Cash, Cash Equivalents and Restricted Cash-Beginning of Period	800,096	617,385
Cash, Cash Equivalents and Restricted Cash-End of Period	384,615	415,001
SUPPLEMENTAL CASH FLOW DISCLOSURE
Payments for Interest	8,400	9,636
Payments for Income Taxes	79,357	32,796
Accrued Dividends	7,125	5,869
Purchase of Noncontrolling Interest	$ 2,701	$ 0

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