Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022
Operating activities:
Net income	$ 673,835	$ 550,985
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	141,780	143,264
Stock-based compensation expense	104,323	77,543
Deferred taxes	(49,550)	2,476
Gain from sale of divested operation	(135,410)	0
Loss on impairment of lease related assets	19,062	37,546
Reduction in the carrying amount of operating lease right-of-use assets	52,741	52,686
Amortization and write-off of deferred financing fees	3,506	3,420
Gain on de-designated swaps	(7,650)	(51,745)
Changes in assets and liabilities, net of acquisitions and divestitures:
Fees receivable, net	418,033	258,543
Deferred commissions	77,510	96,841
Prepaid expenses and other current assets	(39,204)	(19,936)
Other assets	(28,752)	6,371
Deferred revenues	(51,412)	92,527
Accounts payable and accrued and other liabilities	(247,405)	(352,208)
Cash provided by operating activities	931,407	898,313
Investing activities:
Additions to property, equipment and leasehold improvements	(75,145)	(70,461)
Acquisitions - cash paid (net of cash acquired)	(3,800)	(4,109)
Proceeds from sale of divested operation	156,057	0
Cash provided by (used in) investing activities	77,112	(74,570)
Financing activities:
Proceeds from employee stock purchase plan	19,115	16,980
Payments on borrowings	(5,400)	(3,996)
Purchases of treasury stock	(447,739)	(1,026,414)
Cash used in financing activities	(434,024)	(1,013,430)
Net increase (decrease) in cash and cash equivalents and restricted cash	574,495	(189,687)
Effects of exchange rates on cash and cash equivalents	(23,139)	(42,228)
Cash and cash equivalents and restricted cash, beginning of period	698,599	760,602
Cash and cash equivalents and restricted cash, end of period	$ 1,249,955	$ 528,687