CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Cash flows from operating activities:
Net income	$ 170,148	$ 169,788
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and intangible assets amortization	65,133	58,012
Operating lease right-of-use assets expense	10,750	11,374
Deferred income tax benefit	(36,764)	(35,304)
Provision for bad debts	2,311	2,426
Stock-based compensation expense	100,472	75,149
Other	855	3,562
Changes in operating assets and liabilities:
Accounts receivable	133,435	110,044
Other receivables and current assets	47,903	73,596
Other long-term assets	(1,847)	(3,834)
Accounts payable, accrued expenses and current liabilities	(122,952)	(129,933)
Accrued income taxes	5,575	9,097
Deferred revenue	(45,371)	(12,914)
Other long-term liabilities	(6,016)	(1,183)
Net cash provided by operating activities	323,632	329,880
Cash flows from investing activities:
Acquisitions, net of cash acquired	(197,786)	(241,630)
Capital expenditures	(12,037)	(10,059)
Other investing activities	(5,804)	85
Net cash used in investing activities	(215,627)	(251,604)
Cash flows from financing activities:
Purchase of treasury stock	196,494	155,571
Restricted stock withholding taxes paid in lieu of issued shares	(59,855)	(61,554)
Proceeds from shares issued for stock-based compensation	13,622	10,814
Other financing activities	(1,294)	(1,290)
Net cash used in financing activities	(244,021)	(207,601)
Effect of exchange rate fluctuations on cash and cash equivalents	(500)	(21,039)
Net decrease in cash and cash equivalents	(136,516)	(150,364)
Cash and cash equivalents, beginning of period	614,391	667,667
Cash and cash equivalents, end of period	477,875	517,303
Supplemental disclosure of cash flow information:
Income taxes paid	83,635	11,926
Interest paid	21,847	6,298
Non-cash and unpaid consideration in connection with acquisitions	$ 5,056	$ 3,223