Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Operating activities:
Net income	$ 493,826	$ 377,440
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	93,244	96,013
Stock-based compensation expense	77,281	56,575
Deferred taxes	(16,153)	3,256
Gain from sale of divested operation	(135,410)	0
Loss on impairment of lease related assets	18,727	35,501
Reduction in the carrying amount of operating lease right-of-use assets	35,357	35,366
Amortization and write-off of deferred financing fees	2,330	2,273
Gain on de-designated swaps	(5,101)	(40,547)
Changes in assets and liabilities, net of acquisitions and divestitures:
Fees receivable, net	294,569	159,098
Deferred commissions	54,053	60,156
Prepaid expenses and other current assets	(18,667)	(20,248)
Other assets	(30,738)	11,317
Deferred revenues	36,704	212,083
Accounts payable and accrued and other liabilities	(299,561)	(404,891)
Cash provided by operating activities	600,461	583,392
Investing activities:
Additions to property, equipment and leasehold improvements	(46,694)	(38,385)
Proceeds from sale of divested operation	156,057	0
Cash provided by (used in) investing activities	109,363	(38,385)
Financing activities:
Proceeds from employee stock purchase plan	13,240	11,995
Payments on borrowings	(3,600)	(2,663)
Purchases of treasury stock	(238,372)	(929,880)
Cash used in financing activities	(228,732)	(920,548)
Net increase (decrease) in cash and cash equivalents and restricted cash	481,092	(375,541)
Effects of exchange rates on cash and cash equivalents	(6,263)	(20,479)
Cash and cash equivalents and restricted cash, beginning of period	698,599	760,602
Cash and cash equivalents and restricted cash, end of period	$ 1,173,428	$ 364,582