Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018
Operating Activities
Net Income	$ 10,963	$ 17,749
Adjustments to Reconcile Net Income to Net Cash Provided by Operating Activities
Equity-Based Compensation Expense	65,649	64,154
Depreciation and Amortization Expense	7,255	4,099
Amortization of Operating Lease Right-of-Use Assets	8,796
Deferred Taxes	1,320	(3,498)
Other	912	(1,178)
Cash Flows Due to Changes in Operating Assets and Liabilities
Accounts Receivable	(3,541)	(30,308)
Other Assets	(17,159)	(7,655)
Accrued Compensation and Benefits	(29,638)	(28,095)
Accounts Payable, Accrued Expenses and Other Liabilities	(4,889)	3,053
Operating Lease Liabilities	(10,015)
Deferred Rent Liability		14
Taxes Payable	(4,540)	(314)
Deferred Revenue	(1,897)	2,133
Net Cash Provided by Operating Activities	23,216	20,154
Investing Activities
Purchases of Investments		(20,861)
Maturities of Investments		35,185
Purchases of Furniture, Equipment and Leasehold Improvements	(4,477)	(5,960)
Settlement of Acquisition-Related Escrow	7,485
Net Cash Provided by Investing Activities	3,008	8,364
Financing Activities
Dividends	(2,348)	(2,082)
Proceeds from Revolving Credit Facility	15,000
Payments on Revolving Credit Facility	(15,000)
Tax Distributions	(20)	(15)
Employee Taxes Paid for Shares Withheld	(9,277)	(21,052)
Cash-Settled Exchanges of Partnership Units	(10,050)	(30,918)
Treasury Stock Purchases	(25,684)	(25,727)
Payments Pursuant to Tax Receivable Agreement	(210)	(10)
Principal Payments on Finance Leases	(70)	(51)
Net Cash Used in Financing Activities	(47,659)	(79,855)
Effect of Exchange Rate Changes on Cash and Cash Equivalents	(461)	1,252
Net Decrease in Cash and Cash Equivalents	(21,896)	(50,085)
Cash and Cash Equivalents, Beginning of Period	106,110	145,619
Cash and Cash Equivalents, End of Period	84,214	95,534
Supplemental Disclosure of Cash Flows Information
Payments for Income Taxes, Net of Refunds Received	5,667	647
Payments for Interest	$ 839
Non-Cash Receipt of Shares		$ 2,254