Condensed Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Operating activities:
Net income	$ 377,440	$ 435,336
Adjustments to reconcile net income to cash provided by operating activities:
Depreciation and amortization	96,013	108,269
Stock-based compensation expense	56,575	62,276
Deferred taxes	3,256	2,294
Loss on impairment of lease related assets	35,501	0
Reduction in the carrying amount of operating lease right-of-use assets	35,366	37,261
Amortization and write-off of deferred financing fees	2,273	1,914
Gain on de-designated swaps	(40,547)	(11,751)
Changes in assets and liabilities:
Fees receivable, net	159,098	132,650
Deferred commissions	60,156	10,494
Prepaid expenses and other current assets	(20,248)	(822)
Other assets	11,317	(23,769)
Deferred revenues	212,083	190,814
Accounts payable and accrued and other liabilities	(404,891)	(212,321)
Cash provided by operating activities	583,392	732,645
Investing activities:
Additions to property, equipment and leasehold improvements	(38,385)	(24,479)
Acquisitions - cash paid (net of cash acquired)	0	(22,774)
Cash used in investing activities	(38,385)	(47,253)
Financing activities:
Proceeds from employee stock purchase plan	11,995	9,414
Proceeds from borrowings	0	600,000
Payments of deferred financing fees	0	(6,045)
Payments on revolving credit facility	0	(5,000)
Payments on borrowings	(2,663)	(105,256)
Purchases of treasury stock	(929,880)	(1,083,350)
Cash used in financing activities	(920,548)	(590,237)
Net (decrease) increase in cash and cash equivalents and restricted cash	(375,541)	95,155
Effects of exchange rates on cash and cash equivalents	(20,479)	(7,281)
Cash and cash equivalents and restricted cash, beginning of period	760,602	712,583
Cash and cash equivalents and restricted cash, end of period	$ 364,582	$ 800,457